qwindowswindow.cpp

Go to the documentation of this file.

// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include <QtCore/qt_windows.h>
 
#include "qwindowswindow.h"
#include "qwindowscontext.h"
#include "qwindowstheme.h"
#if QT_CONFIG(draganddrop)
#  include "qwindowsdrag.h"
#endif
#include "qwindowsscreen.h"
#include "qwindowsintegration.h"
#include "qwindowsmenu.h"
#include "qwindowsnativeinterface.h"
#if QT_CONFIG(dynamicgl)
#  include "qwindowsglcontext.h"
#else
#  include "qwindowsopenglcontext.h"
#endif
#include "qwindowsopengltester.h"
#ifdef QT_NO_CURSOR
#  include "qwindowscursor.h"
#endif
 
#include <QtGui/qguiapplication.h>
#include <QtGui/qscreen.h>
#include <QtGui/qwindow.h>
#include <QtGui/qregion.h>
#include <QtGui/qopenglcontext.h>
#include <QtGui/private/qwindowsthemecache_p.h>
#include <private/qwindow_p.h> // QWINDOWSIZE_MAX
#include <private/qguiapplication_p.h>
#include <private/qhighdpiscaling_p.h>
#include <qpa/qwindowsysteminterface.h>
 
#include <QtCore/qdebug.h>
#include <QtCore/qlibraryinfo.h>
 
#include <dwmapi.h>
 
#if QT_CONFIG(vulkan)
#include "qwindowsvulkaninstance.h"
#endif
 
#include <shellscalingapi.h>
 
QT_BEGIN_NAMESPACE
 
using QWindowCreationContextPtr = QSharedPointer<QWindowCreationContext>;
 
enum {
    defaultWindowWidth = 160,
    defaultWindowHeight = 160
};
 
Q_GUI_EXPORT HICON qt_pixmapToWinHICON(const QPixmap &);
 
static QByteArray debugWinStyle(DWORD style)
{
    QByteArray rc = "0x";
    rc += QByteArray::number(qulonglong(style), 16);
    if (style & WS_POPUP)
        rc += " WS_POPUP";
    if (style & WS_CHILD)
        rc += " WS_CHILD";
    if (style & WS_OVERLAPPED)
        rc += " WS_OVERLAPPED";
    if (style & WS_CLIPSIBLINGS)
        rc += " WS_CLIPSIBLINGS";
    if (style & WS_CLIPCHILDREN)
        rc += " WS_CLIPCHILDREN";
    if (style & WS_THICKFRAME)
        rc += " WS_THICKFRAME";
    if (style & WS_DLGFRAME)
        rc += " WS_DLGFRAME";
    if (style & WS_SYSMENU)
        rc += " WS_SYSMENU";
    if (style & WS_MINIMIZEBOX)
        rc += " WS_MINIMIZEBOX";
    if (style & WS_MAXIMIZEBOX)
        rc += " WS_MAXIMIZEBOX";
    if (style & WS_BORDER)
        rc += " WS_BORDER";
    if (style & WS_CAPTION)
        rc += " WS_CAPTION";
    if (style & WS_CHILDWINDOW)
        rc += " WS_CHILDWINDOW";
    if (style & WS_DISABLED)
        rc += " WS_DISABLED";
    if (style & WS_GROUP)
        rc += " WS_GROUP";
    if (style & WS_HSCROLL)
        rc += " WS_HSCROLL";
    if (style & WS_ICONIC)
        rc += " WS_ICONIC";
    if (style & WS_MAXIMIZE)
        rc += " WS_MAXIMIZE";
    if (style & WS_MINIMIZE)
        rc += " WS_MINIMIZE";
    if (style & WS_SIZEBOX)
        rc += " WS_SIZEBOX";
    if (style & WS_TABSTOP)
        rc += " WS_TABSTOP";
    if (style & WS_TILED)
        rc += " WS_TILED";
    if (style & WS_VISIBLE)
        rc += " WS_VISIBLE";
    if (style & WS_VSCROLL)
        rc += " WS_VSCROLL";
    return rc;
}
 
static QByteArray debugWinExStyle(DWORD exStyle)
{
    QByteArray rc = "0x";
    rc += QByteArray::number(qulonglong(exStyle), 16);
    if (exStyle & WS_EX_TOOLWINDOW)
        rc += " WS_EX_TOOLWINDOW";
    if (exStyle & WS_EX_CONTEXTHELP)
        rc += " WS_EX_CONTEXTHELP";
    if (exStyle & WS_EX_LAYERED)
        rc += " WS_EX_LAYERED";
    if (exStyle & WS_EX_DLGMODALFRAME)
        rc += " WS_EX_DLGMODALFRAME";
    if (exStyle & WS_EX_LAYOUTRTL)
        rc += " WS_EX_LAYOUTRTL";
    if (exStyle & WS_EX_NOINHERITLAYOUT)
        rc += " WS_EX_NOINHERITLAYOUT";
    if (exStyle & WS_EX_ACCEPTFILES)
        rc += " WS_EX_ACCEPTFILES";
    if (exStyle & WS_EX_APPWINDOW)
        rc += " WS_EX_APPWINDOW";
    if (exStyle & WS_EX_CLIENTEDGE)
        rc += " WS_EX_CLIENTEDGE";
    if (exStyle & WS_EX_COMPOSITED)
        rc += " WS_EX_COMPOSITED";
    if (exStyle & WS_EX_CONTROLPARENT)
        rc += " WS_EX_CONTROLPARENT";
    if (exStyle & WS_EX_LEFT)
        rc += " WS_EX_LEFT";
    if (exStyle & WS_EX_LEFTSCROLLBAR)
        rc += " WS_EX_LEFTSCROLLBAR";
    if (exStyle & WS_EX_LTRREADING)
        rc += " WS_EX_LTRREADING";
    if (exStyle & WS_EX_MDICHILD)
        rc += " WS_EX_MDICHILD";
    if (exStyle & WS_EX_NOACTIVATE)
        rc += " WS_EX_NOACTIVATE";
    if (exStyle & WS_EX_NOPARENTNOTIFY)
        rc += " WS_EX_NOPARENTNOTIFY";
    if (exStyle & WS_EX_NOREDIRECTIONBITMAP)
        rc += " WS_EX_NOREDIRECTIONBITMAP";
    if (exStyle & WS_EX_RIGHT)
        rc += " WS_EX_RIGHT";
    if (exStyle & WS_EX_RIGHTSCROLLBAR)
        rc += " WS_EX_RIGHTSCROLLBAR";
    if (exStyle & WS_EX_RTLREADING)
        rc += " WS_EX_RTLREADING";
    if (exStyle & WS_EX_STATICEDGE)
        rc += " WS_EX_STATICEDGE";
    if (exStyle & WS_EX_TOPMOST)
        rc += " WS_EX_TOPMOST";
    if (exStyle & WS_EX_TRANSPARENT)
        rc += " WS_EX_TRANSPARENT";
    if (exStyle & WS_EX_WINDOWEDGE)
        rc += " WS_EX_WINDOWEDGE";
    return rc;
}
 
static QByteArray debugWinSwpPos(UINT flags)
{
    QByteArray rc = "0x";
    rc += QByteArray::number(flags, 16);
    if (flags & SWP_FRAMECHANGED)
        rc += " SWP_FRAMECHANGED";
    if (flags & SWP_HIDEWINDOW)
        rc += " SWP_HIDEWINDOW";
    if (flags & SWP_NOACTIVATE)
        rc += " SWP_NOACTIVATE";
    if (flags & SWP_NOCOPYBITS)
        rc += " SWP_NOCOPYBITS";
    if (flags & SWP_NOMOVE)
        rc += " SWP_NOMOVE";
    if (flags & SWP_NOOWNERZORDER)
        rc += " SWP_NOOWNERZORDER";
    if (flags & SWP_NOREDRAW)
        rc += " SWP_NOREDRAW";
    if (flags & SWP_NOSENDCHANGING)
        rc += " SWP_NOSENDCHANGING";
    if (flags & SWP_NOSIZE)
        rc += " SWP_NOSIZE";
    if (flags & SWP_NOZORDER)
        rc += " SWP_NOZORDER";
    if (flags & SWP_SHOWWINDOW)
        rc += " SWP_SHOWWINDOW";
    if (flags & SWP_ASYNCWINDOWPOS)
        rc += " SWP_ASYNCWINDOWPOS";
    if (flags & SWP_DEFERERASE)
        rc += " SWP_DEFERERASE";
    if (flags & SWP_DRAWFRAME)
        rc += " SWP_DRAWFRAME";
    if (flags & SWP_NOREPOSITION)
        rc += " SWP_NOREPOSITION";
    return rc;
}
 
[[nodiscard]] static inline QByteArray debugWindowPlacementFlags(const UINT flags)
{
    QByteArray rc = "0x";
    rc += QByteArray::number(flags, 16);
    if (flags & WPF_SETMINPOSITION)
        rc += " WPF_SETMINPOSITION";
    if (flags & WPF_RESTORETOMAXIMIZED)
        rc += " WPF_RESTORETOMAXIMIZED";
    if (flags & WPF_ASYNCWINDOWPLACEMENT)
        rc += " WPF_ASYNCWINDOWPLACEMENT";
    return rc;
}
 
[[nodiscard]] static inline QByteArray debugShowWindowCmd(const UINT cmd)
{
    QByteArray rc = {};
    rc += QByteArray::number(cmd);
    if (cmd == SW_HIDE)
        rc += " SW_HIDE";
    if (cmd == SW_SHOWNORMAL)
        rc += " SW_SHOWNORMAL";
    if (cmd == SW_NORMAL)
        rc += " SW_NORMAL";
    if (cmd == SW_SHOWMINIMIZED)
        rc += " SW_SHOWMINIMIZED";
    if (cmd == SW_SHOWMAXIMIZED)
        rc += " SW_SHOWMAXIMIZED";
    if (cmd == SW_MAXIMIZE)
        rc += " SW_MAXIMIZE";
    if (cmd == SW_SHOWNOACTIVATE)
        rc += " SW_SHOWNOACTIVATE";
    if (cmd == SW_SHOW)
        rc += " SW_SHOW";
    if (cmd == SW_MINIMIZE)
        rc += " SW_MINIMIZE";
    if (cmd == SW_SHOWMINNOACTIVE)
        rc += " SW_SHOWMINNOACTIVE";
    if (cmd == SW_SHOWNA)
        rc += " SW_SHOWNA";
    if (cmd == SW_RESTORE)
        rc += " SW_RESTORE";
    if (cmd == SW_SHOWDEFAULT)
        rc += " SW_SHOWDEFAULT";
    if (cmd == SW_FORCEMINIMIZE)
        rc += " SW_FORCEMINIMIZE";
    return rc;
}
 
static inline QSize qSizeOfRect(const RECT &rect)
{
    return QSize(rect.right -rect.left, rect.bottom - rect.top);
}
 
static inline QRect qrectFromRECT(const RECT &rect)
{
    return QRect(QPoint(rect.left, rect.top), qSizeOfRect(rect));
}
 
static inline RECT RECTfromQRect(const QRect &rect)
{
    const int x = rect.left();
    const int y = rect.top();
    RECT result = { x, y, x + rect.width(), y + rect.height() };
    return result;
}
 
 
#ifndef QT_NO_DEBUG_STREAM
QDebug operator<<(QDebug d, const RECT &r)
{
    QDebugStateSaver saver(d);
    d.nospace();
    d << "RECT(left=" << r.left << ", top=" << r.top
        << ", right=" << r.right << ", bottom=" << r.bottom
        << " (" << r.right - r.left << 'x' << r.bottom - r.top << "))";
    return d;
}
 
QDebug operator<<(QDebug d, const POINT &p)
{
    QDebugStateSaver saver(d);
    d.nospace();
    d << "POINT(x=" << p.x << ", y=" << p.y << ')';
    return d;
}
 
QDebug operator<<(QDebug d, const WINDOWPOS &wp)
{
    QDebugStateSaver saver(d);
    d.nospace();
    d.noquote();
    d <<  "WINDOWPOS(flags=" << debugWinSwpPos(wp.flags) << ", hwnd="
       << wp.hwnd << ", hwndInsertAfter=" << wp.hwndInsertAfter << ", x=" << wp.x
       <<  ", y=" << wp.y << ", cx=" << wp.cx <<  ", cy=" << wp.cy << ')';
    return d;
}
 
QDebug operator<<(QDebug d, const NCCALCSIZE_PARAMS &p)
{
    QDebugStateSaver saver(d);
    d.nospace();
    d << "NCCALCSIZE_PARAMS(rgrc=[" << p.rgrc[0] << ", " << p.rgrc[1] << ", "
        << p.rgrc[2] << "], lppos=" << *p.lppos << ')';
    return d;
}
 
QDebug operator<<(QDebug d, const MINMAXINFO &i)
{
    QDebugStateSaver saver(d);
    d.nospace();
    d << "MINMAXINFO(maxSize=" << i.ptMaxSize << ", "
      << "maxpos=" << i.ptMaxPosition << ", "
      << "maxtrack=" << i.ptMaxTrackSize << ", "
      << "mintrack=" << i.ptMinTrackSize << ')';
    return d;
}
 
QDebug operator<<(QDebug d, const WINDOWPLACEMENT &wp)
{
    QDebugStateSaver saver(d);
    d.nospace();
    d.noquote();
    d <<  "WINDOWPLACEMENT(flags=" << debugWindowPlacementFlags(wp.flags) << ", showCmd="
      << debugShowWindowCmd(wp.showCmd) << ", ptMinPosition=" << wp.ptMinPosition
      << ", ptMaxPosition=" << wp.ptMaxPosition << ", rcNormalPosition="
      << wp.rcNormalPosition << ')';
    return d;
}
 
QDebug operator<<(QDebug d, const GUID &guid)
{
    QDebugStateSaver saver(d);
    d.nospace();
    d << '{' << Qt::hex << Qt::uppercasedigits << qSetPadChar(u'0')
      << qSetFieldWidth(8) << guid.Data1
      << qSetFieldWidth(0) << '-' << qSetFieldWidth(4)
      << guid.Data2 << qSetFieldWidth(0) << '-' << qSetFieldWidth(4)
      << guid.Data3 << qSetFieldWidth(0) << '-' << qSetFieldWidth(4)
      << qSetFieldWidth(2) << guid.Data4[0] << guid.Data4[1]
      << qSetFieldWidth(0) << '-' << qSetFieldWidth(2);
    for (int i = 2; i < 8; ++i)
        d << guid.Data4[i];
    d << qSetFieldWidth(0) << '}';
    return d;
}
#endif // !QT_NO_DEBUG_STREAM
 
static void formatBriefRectangle(QDebug &d, const QRect &r)
{
    d << r.width() << 'x' << r.height() << Qt::forcesign << r.x() << r.y() << Qt::noforcesign;
}
 
static void formatBriefMargins(QDebug &d, const QMargins &m)
{
    d << m.left() << ", " << m.top() << ", " << m.right() << ", " << m.bottom();
}
 
// QTBUG-43872, for windows that do not have WS_EX_TOOLWINDOW set, WINDOWPLACEMENT
// is in workspace/available area coordinates.
static QPoint windowPlacementOffset(HWND hwnd, const QPoint &point)
{
    if (GetWindowLongPtr(hwnd, GWL_EXSTYLE) & WS_EX_TOOLWINDOW)
        return QPoint(0, 0);
    const QWindowsScreenManager &screenManager = QWindowsContext::instance()->screenManager();
    const QWindowsScreen *screen = screenManager.screens().size() == 1
        ? screenManager.screens().constFirst() : screenManager.screenAtDp(point);
    if (screen)
        return screen->availableGeometry().topLeft() - screen->geometry().topLeft();
    return QPoint(0, 0);
}
 
// Return the frame geometry relative to the parent
// if there is one.
static inline QRect frameGeometry(HWND hwnd, bool topLevel)
{
    RECT rect = { 0, 0, 0, 0 };
    if (topLevel) {
        WINDOWPLACEMENT windowPlacement;
        windowPlacement.length = sizeof(WINDOWPLACEMENT);
        GetWindowPlacement(hwnd, &windowPlacement);
        if (windowPlacement.showCmd == SW_SHOWMINIMIZED) {
            const QRect result = qrectFromRECT(windowPlacement.rcNormalPosition);
            return result.translated(windowPlacementOffset(hwnd, result.topLeft()));
        }
    }
    GetWindowRect(hwnd, &rect); // Screen coordinates.
    const HWND parent = GetParent(hwnd);
    if (parent && !topLevel) {
        const int width = rect.right - rect.left;
        const int height = rect.bottom - rect.top;
        POINT leftTop = { rect.left, rect.top };
        screenToClient(parent, &leftTop);
        rect.left = leftTop.x;
        rect.top = leftTop.y;
        rect.right = leftTop.x + width;
        rect.bottom = leftTop.y + height;
    }
    return qrectFromRECT(rect);
}
 
// Return the visibility of the Window (except full screen since it is not a window state).
static QWindow::Visibility windowVisibility_sys(HWND hwnd)
{
    if (!IsWindowVisible(hwnd))
        return QWindow::Hidden;
    WINDOWPLACEMENT windowPlacement;
    windowPlacement.length = sizeof(WINDOWPLACEMENT);
    if (GetWindowPlacement(hwnd, &windowPlacement)) {
        switch (windowPlacement.showCmd) {
        case SW_SHOWMINIMIZED:
        case SW_MINIMIZE:
        case SW_FORCEMINIMIZE:
            return QWindow::Minimized;
        case SW_SHOWMAXIMIZED:
            return QWindow::Maximized;
        default:
            break;
        }
    }
    return QWindow::Windowed;
}
 
static inline bool windowIsAccelerated(const QWindow *w)
{
    switch (w->surfaceType()) {
    case QSurface::OpenGLSurface:
    case QSurface::VulkanSurface:
    case QSurface::Direct3DSurface:
        return true;
    default:
        return false;
    }
}
 
static bool applyBlurBehindWindow(HWND hwnd)
{
    DWM_BLURBEHIND blurBehind = {0, 0, nullptr, 0};
 
    blurBehind.dwFlags = DWM_BB_ENABLE | DWM_BB_BLURREGION;
    blurBehind.fEnable = TRUE;
    blurBehind.hRgnBlur = CreateRectRgn(0, 0, -1, -1);
 
    const bool result = DwmEnableBlurBehindWindow(hwnd, &blurBehind) == S_OK;
 
    if (blurBehind.hRgnBlur)
        DeleteObject(blurBehind.hRgnBlur);
 
    return result;
}
 
// from qwidget_win.cpp, pass flags separately in case they have been "autofixed".
static bool shouldShowMaximizeButton(const QWindow *w, Qt::WindowFlags flags)
{
    if ((flags & Qt::MSWindowsFixedSizeDialogHint) || !(flags & Qt::WindowMaximizeButtonHint))
        return false;
    // if the user explicitly asked for the maximize button, we try to add
    // it even if the window has fixed size.
    return (flags & Qt::CustomizeWindowHint) ||
        w->maximumSize() == QSize(QWINDOWSIZE_MAX, QWINDOWSIZE_MAX);
}
 
bool QWindowsWindow::hasNoNativeFrame(HWND hwnd, Qt::WindowFlags flags)
{
    const LONG_PTR style = GetWindowLongPtr(hwnd, GWL_STYLE);
    return (style & WS_CHILD) || (flags & Qt::FramelessWindowHint);
}
 
// Set the WS_EX_LAYERED flag on a HWND if required. This is required for
// translucent backgrounds, not fully opaque windows and for
// Qt::WindowTransparentForInput (in combination with WS_EX_TRANSPARENT).
bool QWindowsWindow::setWindowLayered(HWND hwnd, Qt::WindowFlags flags, bool hasAlpha, qreal opacity)
{
    const LONG_PTR exStyle = GetWindowLongPtr(hwnd, GWL_EXSTYLE);
    // Native children are frameless by nature, so check for that as well.
    const bool needsLayered = (flags & Qt::WindowTransparentForInput)
        || (hasAlpha && hasNoNativeFrame(hwnd, flags)) || opacity < 1.0;
    const bool isLayered = (exStyle & WS_EX_LAYERED);
    if (needsLayered != isLayered) {
        if (needsLayered) {
            SetWindowLongPtr(hwnd, GWL_EXSTYLE, exStyle | WS_EX_LAYERED);
        } else {
            SetWindowLongPtr(hwnd, GWL_EXSTYLE, exStyle & ~WS_EX_LAYERED);
        }
    }
    return needsLayered;
}
 
static void setWindowOpacity(HWND hwnd, Qt::WindowFlags flags, bool hasAlpha, bool accelerated, qreal level)
{
    if (QWindowsWindow::setWindowLayered(hwnd, flags, hasAlpha, level)) {
        const BYTE alpha = BYTE(qRound(255.0 * level));
        if (hasAlpha && !accelerated && QWindowsWindow::hasNoNativeFrame(hwnd, flags)) {
            // Non-GL windows with alpha: Use blend function to update.
            BLENDFUNCTION blend = {AC_SRC_OVER, 0, alpha, AC_SRC_ALPHA};
            UpdateLayeredWindow(hwnd, nullptr, nullptr, nullptr, nullptr, nullptr, 0, &blend, ULW_ALPHA);
        } else {
            SetLayeredWindowAttributes(hwnd, 0, alpha, LWA_ALPHA);
        }
    } else if (IsWindowVisible(hwnd)) { // Repaint when switching from layered.
        InvalidateRect(hwnd, nullptr, TRUE);
    }
}
 
static inline void updateGLWindowSettings(const QWindow *w, HWND hwnd, Qt::WindowFlags flags, qreal opacity)
{
    const bool isAccelerated = windowIsAccelerated(w);
    const bool hasAlpha = w->format().hasAlpha();
 
    if (isAccelerated && hasAlpha)
        applyBlurBehindWindow(hwnd);
 
    setWindowOpacity(hwnd, flags, hasAlpha, isAccelerated, opacity);
}
 
[[nodiscard]] static inline int getResizeBorderThickness(const UINT dpi)
{
    // The width of the padded border will always be 0 if DWM composition is
    // disabled, but since it will always be enabled and can't be programtically
    // disabled from Windows 8, we are safe to go.
    return GetSystemMetricsForDpi(SM_CXSIZEFRAME, dpi)
           + GetSystemMetricsForDpi(SM_CXPADDEDBORDER, dpi);
}
 
static QMargins invisibleMargins(QPoint screenPoint)
{
    POINT pt = {screenPoint.x(), screenPoint.y()};
    if (HMONITOR hMonitor = MonitorFromPoint(pt, MONITOR_DEFAULTTONULL)) {
        UINT dpiX;
        UINT dpiY;
        if (SUCCEEDED(GetDpiForMonitor(hMonitor, MDT_EFFECTIVE_DPI, &dpiX, &dpiY))) {
            const int gap = getResizeBorderThickness(dpiX);
            return QMargins(gap, 0, gap, gap);
        }
    }
    return QMargins();
}
 
[[nodiscard]] static inline QMargins invisibleMargins(const HWND hwnd)
{
    const UINT dpi = GetDpiForWindow(hwnd);
    const int gap = getResizeBorderThickness(dpi);
    return QMargins(gap, 0, gap, gap);
}
 
struct WindowCreationData
{
    using WindowData = QWindowsWindowData;
    enum Flags { ForceChild = 0x1, ForceTopLevel = 0x2 };
 
    void fromWindow(const QWindow *w, const Qt::WindowFlags flags, unsigned creationFlags = 0);
    inline WindowData create(const QWindow *w, const WindowData &data, QString title) const;
    inline void applyWindowFlags(HWND hwnd) const;
    void initialize(const QWindow *w, HWND h, bool frameChange, qreal opacityLevel) const;
 
    Qt::WindowFlags flags;
    HWND parentHandle = nullptr;
    Qt::WindowType type = Qt::Widget;
    unsigned style = 0;
    unsigned exStyle = 0;
    bool topLevel = false;
    bool popup = false;
    bool dialog = false;
    bool tool = false;
    bool embedded = false;
    bool hasAlpha = false;
};
 
QDebug operator<<(QDebug debug, const WindowCreationData &d)
{
    QDebugStateSaver saver(debug);
    debug.nospace();
    debug.noquote();
    debug << "WindowCreationData: " << d.flags
        << "\n  topLevel=" << d.topLevel;
     if (d.parentHandle)
         debug << " parent=" << d.parentHandle;
     debug << " popup=" << d.popup << " dialog=" << d.dialog
        << " embedded=" << d.embedded << " tool=" << d.tool
        << "\n  style=" << debugWinStyle(d.style);
    if (d.exStyle)
        debug << "\n  exStyle=" << debugWinExStyle(d.exStyle);
    return debug;
}
 
// Fix top level window flags in case only the type flags are passed.
static inline void fixTopLevelWindowFlags(Qt::WindowFlags &flags)
{
    // Not supported on Windows, also do correction when it is set.
    flags &= ~Qt::WindowFullscreenButtonHint;
    switch (flags) {
    case Qt::Window:
        flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowMinimizeButtonHint
              |Qt::WindowMaximizeButtonHint|Qt::WindowCloseButtonHint;
        break;
    case Qt::Dialog:
    case Qt::Tool:
        flags |= Qt::WindowTitleHint | Qt::WindowSystemMenuHint | Qt::WindowCloseButtonHint;
        break;
    default:
        break;
    }
    if ((flags & Qt::WindowType_Mask) == Qt::SplashScreen)
        flags |= Qt::FramelessWindowHint;
}
 
static QScreen *screenForDeviceName(const QWindow *w, const QString &name)
{
    const auto getDeviceName = [](const QScreen *screen) -> QString {
        if (const auto s = static_cast<const QWindowsScreen *>(screen->handle()))
            return s->data().deviceName;
        return {};
    };
    QScreen *winScreen = w ? w->screen() : QGuiApplication::primaryScreen();
    if (winScreen && getDeviceName(winScreen) != name) {
        const auto screens = winScreen->virtualSiblings();
        for (QScreen *screen : screens) {
            if (getDeviceName(screen) == name)
                return screen;
        }
    }
    return winScreen;
}
 
static QPoint calcPosition(const QWindow *w, const QWindowCreationContextPtr &context, const QMargins &invMargins)
{
    const QPoint orgPos(context->frameX - invMargins.left(), context->frameY - invMargins.top());
 
    if (!w || w->type() != Qt::Window)
        return orgPos;
 
    // Workaround for QTBUG-50371
    const QScreen *screenForGL = QWindowsWindow::forcedScreenForGLWindow(w);
    if (!screenForGL)
        return orgPos;
 
    const QPoint posFrame(context->frameX, context->frameY);
    const QMargins margins = context->margins;
    const QRect scrGeo = screenForGL->handle()->availableGeometry();
 
    // Point is already in the required screen.
    if (scrGeo.contains(orgPos))
        return orgPos;
 
    // If the visible part of the window is already in the
    // required screen, just ignore the invisible offset.
    if (scrGeo.contains(posFrame))
        return posFrame;
 
    // Find the original screen containing the coordinates.
    const auto screens = screenForGL->virtualSiblings();
    const QScreen *orgScreen = nullptr;
    for (QScreen *screen : screens) {
        if (screen->handle()->availableGeometry().contains(posFrame)) {
            orgScreen = screen;
            break;
        }
    }
    const QPoint ctPos = QPoint(qMax(scrGeo.left(), scrGeo.center().x()
                                     + (margins.right() - margins.left() - context->frameWidth)/2),
                                qMax(scrGeo.top(), scrGeo.center().y()
                                     + (margins.bottom() - margins.top() - context->frameHeight)/2));
 
    // If initial coordinates were outside all screens, center the window on the required screen.
    if (!orgScreen)
        return ctPos;
 
    const QRect orgGeo = orgScreen->handle()->availableGeometry();
    const QRect orgFrame(QPoint(context->frameX, context->frameY),
                         QSize(context->frameWidth, context->frameHeight));
 
    // Window would be centered on orgScreen. Center it on the required screen.
    if (orgGeo.center() == (orgFrame - margins).center())
        return ctPos;
 
    // Transform the coordinates to map them into the required screen.
    const QPoint newPos(scrGeo.left() + ((posFrame.x() - orgGeo.left()) * scrGeo.width()) / orgGeo.width(),
                        scrGeo.top() + ((posFrame.y() - orgGeo.top()) * scrGeo.height()) / orgGeo.height());
    const QPoint newPosNoMargin(newPos.x() - invMargins.left(), newPos.y() - invMargins.top());
 
    return scrGeo.contains(newPosNoMargin) ? newPosNoMargin : newPos;
}
 
void WindowCreationData::fromWindow(const QWindow *w, const Qt::WindowFlags flagsIn,
                                    unsigned creationFlags)
{
    flags = flagsIn;
 
    // Sometimes QWindow doesn't have a QWindow parent but does have a native parent window,
    // e.g. in case of embedded ActiveQt servers. They should not be considered a top-level
    // windows in such cases.
    QVariant prop = w->property(QWindowsWindow::embeddedNativeParentHandleProperty);
    if (prop.isValid()) {
        embedded = true;
        parentHandle = reinterpret_cast<HWND>(prop.value<WId>());
    }
 
    if (creationFlags & ForceChild) {
        topLevel = false;
    } else if (embedded) {
        // Embedded native windows (for example Active X server windows) are by
        // definition never toplevel, even though they do not have QWindow parents.
        topLevel = false;
    } else {
        topLevel = (creationFlags & ForceTopLevel) ? true : w->isTopLevel();
    }
 
    if (topLevel)
        fixTopLevelWindowFlags(flags);
 
    type = static_cast<Qt::WindowType>(int(flags) & Qt::WindowType_Mask);
    switch (type) {
    case Qt::Dialog:
    case Qt::Sheet:
        dialog = true;
        break;
    case Qt::Drawer:
    case Qt::Tool:
        tool = true;
        break;
    case Qt::Popup:
        popup = true;
        break;
    default:
        break;
    }
    if ((flags & Qt::MSWindowsFixedSizeDialogHint))
        dialog = true;
 
    // This causes the title bar to drawn RTL and the close button
    // to be left. Note that this causes:
    // - All DCs created on the Window to have RTL layout (see SetLayout)
    // - ClientToScreen() and ScreenToClient() to work in reverse as well.
    // - Mouse event coordinates to be mirrored.
    // - Positioning of child Windows.
    if (QGuiApplication::layoutDirection() == Qt::RightToLeft
        && (QWindowsIntegration::instance()->options() & QWindowsIntegration::RtlEnabled) != 0) {
        exStyle |= WS_EX_LAYOUTRTL | WS_EX_NOINHERITLAYOUT;
    }
 
    // Parent: Use transient parent for top levels.
    if (popup) {
        flags |= Qt::WindowStaysOnTopHint; // a popup stays on top, no parent.
    } else if (!embedded) {
        if (const QWindow *parentWindow = topLevel ? w->transientParent() : w->parent())
            parentHandle = QWindowsWindow::handleOf(parentWindow);
    }
 
    if (popup || (type == Qt::ToolTip) || (type == Qt::SplashScreen)) {
        style = WS_POPUP;
    } else if (topLevel) {
        if (flags & Qt::FramelessWindowHint)
            style = WS_POPUP;                // no border
        else if (flags & Qt::WindowTitleHint)
            style = WS_OVERLAPPED;
        else
            style = 0;
    } else {
        style = WS_CHILD;
    }
 
    style |= WS_CLIPSIBLINGS | WS_CLIPCHILDREN ;
 
    if (topLevel) {
        if ((type == Qt::Window || dialog || tool)) {
            if (!(flags & Qt::FramelessWindowHint)) {
                style |= WS_POPUP;
                if (flags & Qt::MSWindowsFixedSizeDialogHint) {
                    style |= WS_DLGFRAME;
                } else {
                    style |= WS_THICKFRAME;
                }
                if (flags & Qt::WindowTitleHint)
                    style |= WS_CAPTION; // Contains WS_DLGFRAME
            }
            if (flags & Qt::WindowSystemMenuHint)
                style |= WS_SYSMENU;
            else if (dialog && (flags & Qt::WindowCloseButtonHint) && !(flags & Qt::FramelessWindowHint)) {
                style |= WS_SYSMENU | WS_BORDER; // QTBUG-2027, dialogs without system menu.
                exStyle |= WS_EX_DLGMODALFRAME;
            }
            const bool showMinimizeButton = flags & Qt::WindowMinimizeButtonHint;
            if (showMinimizeButton)
                style |= WS_MINIMIZEBOX;
            const bool showMaximizeButton = shouldShowMaximizeButton(w, flags);
            if (showMaximizeButton)
                style |= WS_MAXIMIZEBOX;
            if (showMinimizeButton || showMaximizeButton)
                style |= WS_SYSMENU;
            if (tool)
                exStyle |= WS_EX_TOOLWINDOW;
            if ((flags & Qt::WindowContextHelpButtonHint) && !showMinimizeButton
                && !showMaximizeButton)
                exStyle |= WS_EX_CONTEXTHELP;
        } else {
             exStyle |= WS_EX_TOOLWINDOW;
        }
 
        // make mouse events fall through this window
        // NOTE: WS_EX_TRANSPARENT flag can make mouse inputs fall through a layered window
        if (flagsIn & Qt::WindowTransparentForInput)
            exStyle |= WS_EX_LAYERED | WS_EX_TRANSPARENT;
 
        // Currently only compatible with D3D surfaces, use it with care.
        if (qEnvironmentVariableIntValue("QT_QPA_DISABLE_REDIRECTION_SURFACE"))
            exStyle |= WS_EX_NOREDIRECTIONBITMAP;
    }
}
 
static inline bool shouldApplyDarkFrame(const QWindow *w)
{
    if (!w->isTopLevel() || w->flags().testFlag(Qt::FramelessWindowHint))
        return false;
 
    // the user of the application has explicitly opted out of dark frames
    if (!QWindowsIntegration::instance()->darkModeHandling().testFlag(QWindowsApplication::DarkModeWindowFrames))
        return false;
 
    // the application explicitly overrides the color scheme
    if (const auto requestedColorScheme = QWindowsTheme::instance()->requestedColorScheme();
        requestedColorScheme != Qt::ColorScheme::Unknown) {
        return requestedColorScheme == Qt::ColorScheme::Dark;
    }
 
    // if the application supports a dark border, and the palette is dark (window background color
    // is darker than the text), then turn dark-border support on, otherwise use a light border.
    auto *dWindow = QWindowPrivate::get(const_cast<QWindow*>(w));
    const QPalette windowPal = dWindow->windowPalette();
    return windowPal.color(QPalette::WindowText).lightness()
         > windowPal.color(QPalette::Window).lightness();
}
 
QWindowsWindowData
    WindowCreationData::create(const QWindow *w, const WindowData &data, QString title) const
{
    WindowData result;
    result.flags = flags;
 
    const auto appinst = reinterpret_cast<HINSTANCE>(GetModuleHandle(nullptr));
 
    const QString windowClassName = QWindowsContext::instance()->registerWindowClass(w);
 
    const QScreen *screen{};
    const QRect rect = QPlatformWindow::initialGeometry(w, data.geometry,
                                                        defaultWindowWidth, defaultWindowHeight,
                                                        &screen);
 
    if (title.isEmpty() && (result.flags & Qt::WindowTitleHint))
        title = topLevel ? qAppName() : w->objectName();
 
    const auto *titleUtf16 = reinterpret_cast<const wchar_t *>(title.utf16());
    const auto *classNameUtf16 = reinterpret_cast<const wchar_t *>(windowClassName.utf16());
 
    // Capture events before CreateWindowEx() returns. The context is cleared in
    // the QWindowsWindow constructor.
    const QWindowCreationContextPtr context(new QWindowCreationContext(w, screen, data.geometry,
                                                                       rect, data.customMargins,
                                                                       style, exStyle));
    QWindowsContext::instance()->setWindowCreationContext(context);
 
    const bool hasFrame = (style & (WS_DLGFRAME | WS_THICKFRAME))
            && !(result.flags & Qt::FramelessWindowHint);
    QMargins invMargins = topLevel && hasFrame && QWindowsGeometryHint::positionIncludesFrame(w)
            ? invisibleMargins(QPoint(context->frameX, context->frameY)) : QMargins();
 
    qCDebug(lcQpaWindow).nospace()
        << "CreateWindowEx: " << w << " class=" << windowClassName << " title=" << title
        << '\n' << *this << "\nrequested: " << rect << ": "
        << context->frameWidth << 'x' <<  context->frameHeight
        << '+' << context->frameX << '+' << context->frameY
        << " custom margins: " << context->customMargins
        << " invisible margins: " << invMargins;
 
 
    QPoint pos = calcPosition(w, context, invMargins);
 
    // Mirror the position when creating on a parent in RTL mode, ditto for the obtained geometry.
    int mirrorParentWidth = 0;
    if (!w->isTopLevel() && QWindowsBaseWindow::isRtlLayout(parentHandle)) {
        RECT rect;
        GetClientRect(parentHandle, &rect);
        mirrorParentWidth = rect.right;
    }
    if (mirrorParentWidth != 0 && pos.x() != CW_USEDEFAULT && context->frameWidth != CW_USEDEFAULT)
        pos.setX(mirrorParentWidth - context->frameWidth - pos.x());
 
    result.hwnd = CreateWindowEx(exStyle, classNameUtf16, titleUtf16,
                                 style,
                                 pos.x(), pos.y(),
                                 context->frameWidth, context->frameHeight,
                                 parentHandle, nullptr, appinst, nullptr);
    qCDebug(lcQpaWindow).nospace()
        << "CreateWindowEx: returns " << w << ' ' << result.hwnd << " obtained geometry: "
        << context->obtainedPos << context->obtainedSize << ' ' << context->margins;
 
    if (!result.hwnd) {
        qErrnoWarning("%s: CreateWindowEx failed", __FUNCTION__);
        return result;
    }
 
    if (QWindowsTheme::instance()->colorScheme() == Qt::ColorScheme::Dark && shouldApplyDarkFrame(w))
        QWindowsWindow::setDarkBorderToWindow(result.hwnd, true);
 
    if (mirrorParentWidth != 0) {
        context->obtainedPos.setX(mirrorParentWidth - context->obtainedSize.width()
                                  -  context->obtainedPos.x());
    }
 
    QRect obtainedGeometry(context->obtainedPos, context->obtainedSize);
 
    result.geometry = obtainedGeometry;
    result.restoreGeometry = frameGeometry(result.hwnd, topLevel);
    result.fullFrameMargins = context->margins;
    result.embedded = embedded;
    result.hasFrame = hasFrame;
    result.customMargins = context->customMargins;
 
    return result;
}
 
void WindowCreationData::applyWindowFlags(HWND hwnd) const
{
    // Keep enabled and visible from the current style.
    const LONG_PTR oldStyle = GetWindowLongPtr(hwnd, GWL_STYLE);
    const LONG_PTR oldExStyle = GetWindowLongPtr(hwnd, GWL_EXSTYLE);
 
    const LONG_PTR newStyle = style | (oldStyle & (WS_DISABLED|WS_VISIBLE));
    if (oldStyle != newStyle)
        SetWindowLongPtr(hwnd, GWL_STYLE, newStyle);
    const LONG_PTR newExStyle = exStyle;
    if (newExStyle != oldExStyle)
        SetWindowLongPtr(hwnd, GWL_EXSTYLE, newExStyle);
    qCDebug(lcQpaWindow).nospace() << __FUNCTION__ << hwnd << *this
        << "\n    Style from " << debugWinStyle(DWORD(oldStyle)) << "\n    to "
        << debugWinStyle(DWORD(newStyle)) << "\n    ExStyle from "
        << debugWinExStyle(DWORD(oldExStyle)) << " to "
        << debugWinExStyle(DWORD(newExStyle));
}
 
void WindowCreationData::initialize(const QWindow *w, HWND hwnd, bool frameChange, qreal opacityLevel) const
{
    if (!hwnd)
        return;
    UINT swpFlags = SWP_NOMOVE | SWP_NOSIZE | SWP_NOOWNERZORDER;
    if (frameChange)
        swpFlags |= SWP_FRAMECHANGED;
    if (topLevel) {
        swpFlags |= SWP_NOACTIVATE;
        if ((flags & Qt::WindowStaysOnTopHint) || (type == Qt::ToolTip)) {
            SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0, swpFlags);
            if (flags & Qt::WindowStaysOnBottomHint)
                qWarning("QWidget: Incompatible window flags: the window can't be on top and on bottom at the same time");
        } else if (flags & Qt::WindowStaysOnBottomHint) {
            SetWindowPos(hwnd, HWND_BOTTOM, 0, 0, 0, 0, swpFlags);
        } else if (frameChange) { // Force WM_NCCALCSIZE with wParam=1 in case of custom margins.
            SetWindowPos(hwnd, HWND_NOTOPMOST, 0, 0, 0, 0, swpFlags);
        }
        if (flags & (Qt::CustomizeWindowHint|Qt::WindowTitleHint)) {
            HMENU systemMenu = GetSystemMenu(hwnd, FALSE);
            if (flags & Qt::WindowCloseButtonHint)
                EnableMenuItem(systemMenu, SC_CLOSE, MF_BYCOMMAND|MF_ENABLED);
            else
                EnableMenuItem(systemMenu, SC_CLOSE, MF_BYCOMMAND|MF_GRAYED);
        }
        updateGLWindowSettings(w, hwnd, flags, opacityLevel);
    } else { // child.
        SetWindowPos(hwnd, HWND_TOP, 0, 0, 0, 0, swpFlags);
    }
}
 
 
// Scaling helpers for size constraints.
static QSize toNativeSizeConstrained(QSize dip, const QScreen *s)
{
    if (QHighDpiScaling::isActive()) {
        const qreal factor = QHighDpiScaling::factor(s);
        if (!qFuzzyCompare(factor, qreal(1))) {
            if (dip.width() > 0 && dip.width() < QWINDOWSIZE_MAX)
                dip.setWidth(qRound(qreal(dip.width()) * factor));
            if (dip.height() > 0 && dip.height() < QWINDOWSIZE_MAX)
                dip.setHeight(qRound(qreal(dip.height()) * factor));
        }
    }
    return dip;
}
 
// Helper for checking if frame adjustment needs to be skipped
// NOTE: Unmaximized frameless windows will skip margins calculation
static bool shouldOmitFrameAdjustment(const Qt::WindowFlags flags, DWORD style)
{
    return flags.testFlag(Qt::FramelessWindowHint) && !(style & WS_MAXIMIZE);
}
 
// Helper for checking if frame adjustment needs to be skipped
// NOTE: Unmaximized frameless windows will skip margins calculation
static bool shouldOmitFrameAdjustment(const Qt::WindowFlags flags, HWND hwnd)
{
    DWORD style = hwnd != nullptr ? DWORD(GetWindowLongPtr(hwnd, GWL_STYLE)) : 0;
    return flags.testFlag(Qt::FramelessWindowHint) && !(style & WS_MAXIMIZE);
}
 
QMargins QWindowsGeometryHint::frameOnPrimaryScreen(const QWindow *w, DWORD style, DWORD exStyle)
{
    if (!w->isTopLevel() || shouldOmitFrameAdjustment(w->flags(), style))
        return {};
    RECT rect = {0,0,0,0};
    style &= ~DWORD(WS_OVERLAPPED); // Not permitted, see docs.
    if (AdjustWindowRectEx(&rect, style, FALSE, exStyle) == FALSE)
        qErrnoWarning("%s: AdjustWindowRectEx failed", __FUNCTION__);
    const QMargins result(qAbs(rect.left), qAbs(rect.top),
                          qAbs(rect.right), qAbs(rect.bottom));
    qCDebug(lcQpaWindow).nospace() << __FUNCTION__ << " style="
        << Qt::showbase << Qt::hex << style << " exStyle=" << exStyle << Qt::dec << Qt::noshowbase
        << ' ' << rect << ' ' << result;
    return result;
}
 
QMargins QWindowsGeometryHint::frameOnPrimaryScreen(const QWindow *w, HWND hwnd)
{
    return frameOnPrimaryScreen(w, DWORD(GetWindowLongPtr(hwnd, GWL_STYLE)),
                                DWORD(GetWindowLongPtr(hwnd, GWL_EXSTYLE)));
}
 
QMargins QWindowsGeometryHint::frame(const QWindow *w, DWORD style, DWORD exStyle, qreal dpi)
{
    if (!w->isTopLevel() || shouldOmitFrameAdjustment(w->flags(), style))
        return {};
    RECT rect = {0,0,0,0};
    style &= ~DWORD(WS_OVERLAPPED); // Not permitted, see docs.
    if (AdjustWindowRectExForDpi(&rect, style, FALSE, exStyle, unsigned(qRound(dpi))) == FALSE) {
        qErrnoWarning("%s: AdjustWindowRectExForDpi failed", __FUNCTION__);
    }
    const QMargins result(qAbs(rect.left), qAbs(rect.top),
                          qAbs(rect.right), qAbs(rect.bottom));
    qCDebug(lcQpaWindow).nospace() << __FUNCTION__ << " style="
        << Qt::showbase << Qt::hex << style << " exStyle=" << exStyle << Qt::dec << Qt::noshowbase
        << " dpi=" << dpi
        << ' ' << rect << ' ' << result;
    return result;
}
 
QMargins QWindowsGeometryHint::frame(const QWindow *w, HWND hwnd, DWORD style, DWORD exStyle)
{
    if (!w->isTopLevel() || shouldOmitFrameAdjustment(w->flags(), style))
        return {};
    if (QWindowsScreenManager::isSingleScreen())
        return frameOnPrimaryScreen(w, style, exStyle);
    auto &screenManager = QWindowsContext::instance()->screenManager();
    auto screen = screenManager.screenForHwnd(hwnd);
    if (!screen)
        screen = screenManager.screens().value(0);
    const auto dpi = screen ? screen->logicalDpi().first : qreal(96);
    return frame(w, style, exStyle, dpi);
}
 
QMargins QWindowsGeometryHint::frame(const QWindow *w, HWND hwnd)
{
    return frame(w, hwnd, DWORD(GetWindowLongPtr(hwnd, GWL_STYLE)),
                 DWORD(GetWindowLongPtr(hwnd, GWL_EXSTYLE)));
}
 
// For newly created windows.
QMargins QWindowsGeometryHint::frame(const QWindow *w, const QRect &geometry,
                                     DWORD style, DWORD exStyle)
{
    if (!w->isTopLevel() || shouldOmitFrameAdjustment(w->flags(), style))
        return {};
    if (QWindowsScreenManager::isSingleScreen()
        || !QWindowsContext::shouldHaveNonClientDpiScaling(w)) {
        return frameOnPrimaryScreen(w, style, exStyle);
    }
    qreal dpi = 96;
    auto &screenManager = QWindowsContext::instance()->screenManager();
    auto screen = screenManager.screenAtDp(geometry.center());
    if (!screen)
        screen = screenManager.screens().value(0);
    if (screen)
        dpi = screen->logicalDpi().first;
    return QWindowsGeometryHint::frame(w, style, exStyle, dpi);
}
 
bool QWindowsGeometryHint::handleCalculateSize(const QMargins &customMargins, const MSG &msg, LRESULT *result)
{
    // NCCALCSIZE_PARAMS structure if wParam==TRUE
    if (!msg.wParam || customMargins.isNull())
        return false;
    *result = DefWindowProc(msg.hwnd, msg.message, msg.wParam, msg.lParam);
    auto *ncp = reinterpret_cast<NCCALCSIZE_PARAMS *>(msg.lParam);
    const RECT oldClientArea = ncp->rgrc[0];
    ncp->rgrc[0].left += customMargins.left();
    ncp->rgrc[0].top += customMargins.top();
    ncp->rgrc[0].right -= customMargins.right();
    ncp->rgrc[0].bottom -= customMargins.bottom();
    result = nullptr;
    qCDebug(lcQpaWindow).nospace() << __FUNCTION__ << oldClientArea << '+' << customMargins << "-->"
        << ncp->rgrc[0] << ' ' << ncp->rgrc[1] << ' ' << ncp->rgrc[2]
        << ' ' << ncp->lppos->cx << ',' << ncp->lppos->cy;
    return true;
}
 
void QWindowsGeometryHint::frameSizeConstraints(const QWindow *w, const QScreen *screen,
                                                const QMargins &margins,
                                                QSize *minimumSize, QSize *maximumSize)
{
    *minimumSize = toNativeSizeConstrained(w->minimumSize(), screen);
    *maximumSize = toNativeSizeConstrained(w->maximumSize(), screen);
 
    const int maximumWidth = qMax(maximumSize->width(), minimumSize->width());
    const int maximumHeight = qMax(maximumSize->height(), minimumSize->height());
    const int frameWidth = margins.left() + margins.right();
    const int frameHeight = margins.top() + margins.bottom();
 
    if (minimumSize->width() > 0)
        minimumSize->rwidth() += frameWidth;
    if (minimumSize->height() > 0)
        minimumSize->rheight() += frameHeight;
    if (maximumWidth < QWINDOWSIZE_MAX)
        maximumSize->setWidth(maximumWidth + frameWidth);
    if (maximumHeight < QWINDOWSIZE_MAX)
        maximumSize->setHeight(maximumHeight + frameHeight);
}
 
void QWindowsGeometryHint::applyToMinMaxInfo(const QWindow *w,
                                             const QScreen *screen,
                                             const QMargins &margins,
                                             MINMAXINFO *mmi)
{
    QSize minimumSize;
    QSize maximumSize;
    frameSizeConstraints(w, screen, margins, &minimumSize, &maximumSize);
    qCDebug(lcQpaWindow).nospace() << '>' << __FUNCTION__ << '<' << " min="
        << minimumSize.width() << ',' << minimumSize.height()
        << " max=" << maximumSize.width() << ',' << maximumSize.height()
        << " margins=" << margins
        << " in " << *mmi;
 
    if (minimumSize.width() > 0)
        mmi->ptMinTrackSize.x = minimumSize.width();
    if (minimumSize.height() > 0)
        mmi->ptMinTrackSize.y = minimumSize.height();
 
    if (maximumSize.width() < QWINDOWSIZE_MAX)
        mmi->ptMaxTrackSize.x = maximumSize.width();
    if (maximumSize.height() < QWINDOWSIZE_MAX)
        mmi->ptMaxTrackSize.y = maximumSize.height();
    qCDebug(lcQpaWindow).nospace() << '<' << __FUNCTION__ << " out " << *mmi;
}
 
void QWindowsGeometryHint::applyToMinMaxInfo(const QWindow *w,
                                             const QMargins &margins,
                                             MINMAXINFO *mmi)
{
    applyToMinMaxInfo(w, w->screen(), margins, mmi);
}
 
bool QWindowsGeometryHint::positionIncludesFrame(const QWindow *w)
{
    return qt_window_private(const_cast<QWindow *>(w))->positionPolicy
           == QWindowPrivate::WindowFrameInclusive;
}
 
bool QWindowsBaseWindow::isRtlLayout(HWND hwnd)
{
    return (GetWindowLongPtr(hwnd, GWL_EXSTYLE) & WS_EX_LAYOUTRTL) != 0;
}
 
QWindowsBaseWindow *QWindowsBaseWindow::baseWindowOf(const QWindow *w)
{
    if (w) {
        if (QPlatformWindow *pw = w->handle())
            return static_cast<QWindowsBaseWindow *>(pw);
    }
    return nullptr;
}
 
HWND QWindowsBaseWindow::handleOf(const QWindow *w)
{
    const QWindowsBaseWindow *bw = QWindowsBaseWindow::baseWindowOf(w);
    return bw ? bw->handle() : HWND(nullptr);
}
 
bool QWindowsBaseWindow::isTopLevel_sys() const
{
    const HWND parent = parentHwnd();
    return !parent || parent == GetDesktopWindow();
}
 
QRect QWindowsBaseWindow::frameGeometry_sys() const
{
    return frameGeometry(handle(), isTopLevel());
}
 
QRect QWindowsBaseWindow::geometry_sys() const
{
    return frameGeometry_sys().marginsRemoved(fullFrameMargins());
}
 
QMargins QWindowsBaseWindow::frameMargins_sys() const
{
    return QWindowsGeometryHint::frame(window(), handle(), style(), exStyle());
}
 
std::optional<QWindowsBaseWindow::TouchWindowTouchTypes>
    QWindowsBaseWindow::touchWindowTouchTypes_sys() const
{
    ULONG touchFlags = 0;
    if (IsTouchWindow(handle(), &touchFlags) == FALSE)
        return {};
    TouchWindowTouchTypes result;
    if ((touchFlags & TWF_FINETOUCH) != 0)
        result.setFlag(TouchWindowTouchType::FineTouch);
    if ((touchFlags & TWF_WANTPALM) != 0)
        result.setFlag(TouchWindowTouchType::WantPalmTouch);
    return result;
}
 
void QWindowsBaseWindow::hide_sys() // Normal hide, do not activate other windows.
{
    SetWindowPos(handle(), nullptr , 0, 0, 0, 0,
                 SWP_HIDEWINDOW | SWP_NOSIZE | SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);
}
 
void QWindowsBaseWindow::raise_sys()
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << this << window();
    const Qt::WindowType type = window()->type();
    if (type == Qt::Popup
        || type == Qt::SubWindow // Special case for QTBUG-63121: MDI subwindows with WindowStaysOnTopHint
        || !(window()->flags() & Qt::WindowStaysOnBottomHint)) {
        SetWindowPos(handle(), HWND_TOP, 0, 0, 0, 0, SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE);
    }
}
 
void QWindowsBaseWindow::lower_sys()
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << this << window();
    if (!(window()->flags() & Qt::WindowStaysOnTopHint))
        SetWindowPos(handle(), HWND_BOTTOM, 0, 0, 0, 0, SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE);
}
 
void QWindowsBaseWindow::setWindowTitle_sys(const QString &title)
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << this << window() << title;
    SetWindowText(handle(), reinterpret_cast<const wchar_t *>(title.utf16()));
}
 
QPoint QWindowsBaseWindow::mapToGlobal(const QPoint &pos) const
{
    return QWindowsGeometryHint::mapToGlobal(handle(), pos);
}
 
QPoint QWindowsBaseWindow::mapFromGlobal(const QPoint &pos) const
{
    return QWindowsGeometryHint::mapFromGlobal(handle(), pos);
}
 
void QWindowsBaseWindow::setHasBorderInFullScreen(bool)
{
    Q_UNIMPLEMENTED();
}
 
bool QWindowsBaseWindow::hasBorderInFullScreen() const
{
    Q_UNIMPLEMENTED();
    return false;
}
 
QMargins QWindowsBaseWindow::customMargins() const
{
    return {};
}
 
void QWindowsBaseWindow::setCustomMargins(const QMargins &)
{
    Q_UNIMPLEMENTED();
}
 
QWindowsForeignWindow::QWindowsForeignWindow(QWindow *window, HWND hwnd)
    : QWindowsBaseWindow(window)
    , m_hwnd(hwnd)
    , m_topLevelStyle(0)
{
    if (QPlatformWindow::parent())
        setParent(QPlatformWindow::parent());
}
 
void QWindowsForeignWindow::setParent(const QPlatformWindow *newParentWindow)
{
    const bool wasTopLevel = isTopLevel_sys();
    const HWND newParent = newParentWindow ? reinterpret_cast<HWND>(newParentWindow->winId()) : HWND(nullptr);
    const bool isTopLevel = !newParent;
    const DWORD oldStyle = style();
    qCDebug(lcQpaWindow) << __FUNCTION__ << window() << "newParent="
        << newParentWindow << newParent << "oldStyle=" << debugWinStyle(oldStyle);
    SetParent(m_hwnd, newParent);
    if (wasTopLevel != isTopLevel) { // Top level window flags need to be set/cleared manually.
        DWORD newStyle = oldStyle;
        if (isTopLevel) {
            newStyle = m_topLevelStyle;
        } else {
            m_topLevelStyle = oldStyle;
            newStyle &= ~(WS_OVERLAPPEDWINDOW | WS_POPUPWINDOW);
            newStyle |= WS_CHILD;
        }
        SetWindowLongPtr(m_hwnd, GWL_STYLE, newStyle);
    }
}
 
void QWindowsForeignWindow::setVisible(bool visible)
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << window() << visible;
    if (visible)
        ShowWindow(handle(), SW_SHOWNOACTIVATE);
    else
        hide_sys();
}
 
QWindowCreationContext::QWindowCreationContext(const QWindow *w, const QScreen *s,
                                               const QRect &geometryIn, const QRect &geometry,
                                               const QMargins &cm,
                                               DWORD style, DWORD exStyle) :
    window(w),
    screen(s),
    requestedGeometryIn(geometryIn),
    requestedGeometry(geometry),
    obtainedPos(geometryIn.topLeft()),
    obtainedSize(geometryIn.size()),
    margins(QWindowsGeometryHint::frame(w, geometry, style, exStyle))
{
    // Geometry of toplevels does not consider window frames.
    // TODO: No concept of WA_wasMoved yet that would indicate a
    // CW_USEDEFAULT unless set. For now, assume that 0,0 means 'default'
    // for toplevels.
 
    if (!(w->flags() & Qt::FramelessWindowHint))
        customMargins = cm;
 
    if (geometry.isValid()
        || !qt_window_private(const_cast<QWindow *>(w))->resizeAutomatic) {
        frameX = geometry.x();
        frameY = geometry.y();
        const QMargins effectiveMargins = margins + customMargins;
        frameWidth = effectiveMargins.left() + geometry.width() + effectiveMargins.right();
        frameHeight = effectiveMargins.top() + geometry.height() + effectiveMargins.bottom();
        if (QWindowsMenuBar::menuBarOf(w) != nullptr) {
            menuHeight = GetSystemMetrics(SM_CYMENU);
            frameHeight += menuHeight;
        }
        const bool isDefaultPosition = !frameX && !frameY && w->isTopLevel();
        if (!QWindowsGeometryHint::positionIncludesFrame(w) && !isDefaultPosition) {
            frameX -= effectiveMargins.left();
            frameY -= effectiveMargins.top();
        }
    }
 
    qCDebug(lcQpaWindow).nospace()
        << __FUNCTION__ << ' ' << w << ' ' << geometry
        << " pos incl. frame=" << QWindowsGeometryHint::positionIncludesFrame(w)
        << " frame=" << frameWidth << 'x' << frameHeight << '+'
        << frameX << '+' << frameY
        << " margins=" << margins << " custom margins=" << customMargins;
}
 
void QWindowCreationContext::applyToMinMaxInfo(MINMAXINFO *mmi) const
{
    QWindowsGeometryHint::applyToMinMaxInfo(window, screen, margins + customMargins, mmi);
}
 
const char *QWindowsWindow::embeddedNativeParentHandleProperty = "_q_embedded_native_parent_handle";
const char *QWindowsWindow::hasBorderInFullScreenProperty = "_q_has_border_in_fullscreen";
bool QWindowsWindow::m_borderInFullScreenDefault = false;
bool QWindowsWindow::m_inSetgeometry = false;
 
QWindowsWindow::QWindowsWindow(QWindow *aWindow, const QWindowsWindowData &data) :
    QWindowsBaseWindow(aWindow),
    m_data(data),
    m_cursor(new CursorHandle)
#if QT_CONFIG(vulkan)
  , m_vkSurface(VK_NULL_HANDLE)
#endif
{
    QWindowsContext::instance()->addWindow(m_data.hwnd, this);
    const Qt::WindowType type = aWindow->type();
    if (type == Qt::Desktop)
        return; // No further handling for Qt::Desktop
    if (aWindow->surfaceType() == QWindow::Direct3DSurface)
        setFlag(Direct3DSurface);
#if QT_CONFIG(opengl)
    if (aWindow->surfaceType() == QWindow::OpenGLSurface)
        setFlag(OpenGLSurface);
#endif
#if QT_CONFIG(vulkan)
    if (aWindow->surfaceType() == QSurface::VulkanSurface)
        setFlag(VulkanSurface);
#endif
    updateDropSite(window()->isTopLevel());
 
    // Register touch unless if the flags are already set by a hook
    // such as HCBT_CREATEWND
    if (!touchWindowTouchTypes_sys().has_value())
        registerTouchWindow();
 
    const qreal opacity = qt_window_private(aWindow)->opacity;
    if (!qFuzzyCompare(opacity, qreal(1.0)))
        setOpacity(opacity);
 
    setMask(QHighDpi::toNativeLocalRegion(window()->mask(), window()));
 
    if (aWindow->isTopLevel())
        setWindowIcon(aWindow->icon());
    if (m_borderInFullScreenDefault || aWindow->property(hasBorderInFullScreenProperty).toBool())
        setFlag(HasBorderInFullScreen);
    clearFlag(WithinCreate);
}
 
QWindowsWindow::~QWindowsWindow()
{
    setFlag(WithinDestroy);
    QWindowsThemeCache::clearThemeCache(m_data.hwnd);
    if (testFlag(TouchRegistered))
        UnregisterTouchWindow(m_data.hwnd);
    destroyWindow();
    destroyIcon();
}
 
void QWindowsWindow::initialize()
{
    // Clear the creation context as the window can be found in QWindowsContext's map.
    QWindowCreationContextPtr creationContext =
        QWindowsContext::instance()->setWindowCreationContext(QWindowCreationContextPtr());
 
    QWindow *w = window();
    setWindowState(w->windowStates());
 
    // Trigger geometry change (unless it has a special state in which case setWindowState()
    // will send the message) and screen change signals of QWindow.
    if (w->type() != Qt::Desktop) {
        const Qt::WindowState state = w->windowState();
        const QRect obtainedGeometry(creationContext->obtainedPos, creationContext->obtainedSize);
        QPlatformScreen *obtainedScreen = screenForGeometry(obtainedGeometry);
        if (obtainedScreen && screen() != obtainedScreen)
            QWindowSystemInterface::handleWindowScreenChanged<QWindowSystemInterface::SynchronousDelivery>(w, obtainedScreen->screen());
        if (state != Qt::WindowMaximized && state != Qt::WindowFullScreen
            && creationContext->requestedGeometryIn != obtainedGeometry) {
            QWindowSystemInterface::handleGeometryChange<QWindowSystemInterface::SynchronousDelivery>(w, obtainedGeometry);
        }
    }
    QWindowsWindow::setSavedDpi(GetDpiForWindow(handle()));
}
 
QSurfaceFormat QWindowsWindow::format() const
{
    return window()->requestedFormat();
}
 
void QWindowsWindow::fireExpose(const QRegion &region, bool force)
{
    if (region.isEmpty() && !force)
        clearFlag(Exposed);
    else
        setFlag(Exposed);
    QWindowSystemInterface::handleExposeEvent(window(), region);
}
 
void QWindowsWindow::fireFullExpose(bool force)
{
    fireExpose(QRect(QPoint(0, 0), m_data.geometry.size()), force);
}
 
void QWindowsWindow::destroyWindow()
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << this << window() << m_data.hwnd;
    if (m_data.hwnd) { // Stop event dispatching before Window is destroyed.
        setFlag(WithinDestroy);
        // Clear any transient child relationships as Windows will otherwise destroy them (QTBUG-35499, QTBUG-36666)
        const auto tlw = QGuiApplication::topLevelWindows();
        for (QWindow *w : tlw) {
            if (w->transientParent() == window()) {
                if (QWindowsWindow *tw = QWindowsWindow::windowsWindowOf(w))
                    tw->updateTransientParent();
            }
        }
        QWindowsContext *context = QWindowsContext::instance();
        if (context->windowUnderMouse() == window())
            context->clearWindowUnderMouse();
        if (hasMouseCapture())
            setMouseGrabEnabled(false);
        setDropSiteEnabled(false);
#if QT_CONFIG(vulkan)
        if (m_vkSurface) {
            QVulkanInstance *inst = window()->vulkanInstance();
            if (inst)
                static_cast<QWindowsVulkanInstance *>(inst->handle())->destroySurface(m_vkSurface);
            m_vkSurface = VK_NULL_HANDLE;
        }
#endif
#ifndef QT_NO_OPENGL
        if (m_surface) {
            if (QWindowsStaticOpenGLContext *staticOpenGLContext = QWindowsIntegration::staticOpenGLContext())
                staticOpenGLContext->destroyWindowSurface(m_surface);
            m_surface = nullptr;
        }
#endif
        DestroyWindow(m_data.hwnd);
        context->removeWindow(m_data.hwnd);
        m_data.hwnd = nullptr;
    }
}
 
void QWindowsWindow::updateDropSite(bool topLevel)
{
    bool enabled = false;
    bool parentIsEmbedded = false;
 
    if (!topLevel) {
        // if the parent window is a foreign window wrapped via QWindow::fromWinId, we need to enable the drop site
        // on the first child window
        const QWindow *parent = window()->parent();
        if (parent && parent->handle() && parent->handle()->isForeignWindow())
            parentIsEmbedded = true;
    }
 
    if (topLevel || parentIsEmbedded) {
        switch (window()->type()) {
        case Qt::Window:
        case Qt::Dialog:
        case Qt::Sheet:
        case Qt::Drawer:
        case Qt::Popup:
        case Qt::Tool:
            enabled = true;
            break;
        default:
            break;
        }
    }
    setDropSiteEnabled(enabled);
}
 
void QWindowsWindow::setDropSiteEnabled(bool dropEnabled)
{
    if (isDropSiteEnabled() == dropEnabled)
        return;
    qCDebug(lcQpaMime) << __FUNCTION__ << window() << dropEnabled;
#if QT_CONFIG(clipboard) && QT_CONFIG(draganddrop)
    if (dropEnabled) {
        Q_ASSERT(m_data.hwnd);
        m_dropTarget = new QWindowsOleDropTarget(window());
        RegisterDragDrop(m_data.hwnd, m_dropTarget);
        CoLockObjectExternal(m_dropTarget, true, true);
    } else {
        CoLockObjectExternal(m_dropTarget, false, true);
        m_dropTarget->Release();
        RevokeDragDrop(m_data.hwnd);
        m_dropTarget = nullptr;
    }
#endif // QT_CONFIG(clipboard) && QT_CONFIG(draganddrop)
}
 
bool QWindowsWindow::m_screenForGLInitialized = false;
 
void QWindowsWindow::displayChanged()
{
    m_screenForGLInitialized = false;
}
 
void QWindowsWindow::settingsChanged()
{
    m_screenForGLInitialized = false;
}
 
QScreen *QWindowsWindow::forcedScreenForGLWindow(const QWindow *w)
{
    static QString forceToScreen;
    if (!m_screenForGLInitialized) {
        forceToScreen = GpuDescription::detect().gpuSuitableScreen;
        m_screenForGLInitialized = true;
    }
    return forceToScreen.isEmpty() ? nullptr : screenForDeviceName(w, forceToScreen);
}
 
// Returns topmost QWindowsWindow ancestor even if there are embedded windows in the chain.
// Returns this window if it is the topmost ancestor.
QWindow *QWindowsWindow::topLevelOf(QWindow *w)
{
    while (QWindow *parent = w->parent())
        w = parent;
 
    if (const QPlatformWindow *handle = w->handle()) {
        const auto *ww = static_cast<const QWindowsWindow *>(handle);
        if (ww->isEmbedded()) {
            HWND parentHWND = GetAncestor(ww->handle(), GA_PARENT);
            const HWND desktopHwnd = GetDesktopWindow();
            const QWindowsContext *ctx = QWindowsContext::instance();
            while (parentHWND && parentHWND != desktopHwnd) {
                if (QWindowsWindow *ancestor = ctx->findPlatformWindow(parentHWND))
                    return topLevelOf(ancestor->window());
                parentHWND = GetAncestor(parentHWND, GA_PARENT);
            }
        }
    }
    return w;
}
 
QWindowsWindowData
    QWindowsWindowData::create(const QWindow *w,
                                       const QWindowsWindowData &parameters,
                                       const QString &title)
{
    WindowCreationData creationData;
    creationData.fromWindow(w, parameters.flags);
    QWindowsWindowData result = creationData.create(w, parameters, title);
    // Force WM_NCCALCSIZE (with wParam=1) via SWP_FRAMECHANGED for custom margin.
    creationData.initialize(w, result.hwnd, !parameters.customMargins.isNull(), 1);
    return result;
}
 
void QWindowsWindow::setVisible(bool visible)
{
    const QWindow *win = window();
    qCDebug(lcQpaWindow) << __FUNCTION__ << this << win << m_data.hwnd << visible;
    if (m_data.hwnd) {
        if (visible) {
            show_sys();
 
            // When the window is layered, we won't get WM_PAINT, and "we" are in control
            // over the rendering of the window
            // There is nobody waiting for this, so we don't need to flush afterwards.
            if (isLayered())
                fireFullExpose();
            // QTBUG-44928, QTBUG-7386: This is to resolve the problem where popups are
            // opened from the system tray and not being implicitly activated
 
            if (win->type() == Qt::Popup && !win->parent() && !QGuiApplication::focusWindow())
                SetForegroundWindow(m_data.hwnd);
        } else {
            if (hasMouseCapture())
                setMouseGrabEnabled(false);
            if (window()->flags() & Qt::Popup) // from QWidgetPrivate::hide_sys(), activate other
                ShowWindow(m_data.hwnd, SW_HIDE);
            else
                hide_sys();
            fireExpose(QRegion());
        }
    }
}
 
bool QWindowsWindow::isVisible() const
{
    return m_data.hwnd && IsWindowVisible(m_data.hwnd);
}
 
bool QWindowsWindow::isActive() const
{
    // Check for native windows or children of the active native window.
    if (const HWND activeHwnd = GetForegroundWindow())
        if (m_data.hwnd == activeHwnd || IsChild(activeHwnd, m_data.hwnd))
            return true;
    return false;
}
 
bool QWindowsWindow::isAncestorOf(const QPlatformWindow *child) const
{
    const auto *childWindow = static_cast<const QWindowsWindow *>(child);
    return IsChild(m_data.hwnd, childWindow->handle());
}
 
bool QWindowsWindow::isEmbedded() const
{
    return m_data.embedded;
}
 
QPoint QWindowsWindow::mapToGlobal(const QPoint &pos) const
{
    return m_data.hwnd ? QWindowsGeometryHint::mapToGlobal(m_data.hwnd, pos) : pos;
}
 
QPoint QWindowsWindow::mapFromGlobal(const QPoint &pos) const
{
    return m_data.hwnd ? QWindowsGeometryHint::mapFromGlobal(m_data.hwnd, pos) : pos;
}
 
// Update the transient parent for a toplevel window. The concept does not
// really exist on Windows, the relationship is set by passing a parent along with !WS_CHILD
// to window creation or by setting the parent using  GWL_HWNDPARENT (as opposed to
// SetParent, which would make it a real child).
 
#ifndef GWL_HWNDPARENT
#    define GWL_HWNDPARENT (-8)
#endif
 
void QWindowsWindow::updateTransientParent() const
{
    if (window()->type() == Qt::Popup)
        return; // QTBUG-34503, // a popup stays on top, no parent, see also WindowCreationData::fromWindow().
    // Update transient parent.
    const HWND oldTransientParent = GetWindow(m_data.hwnd, GW_OWNER);
    HWND newTransientParent = nullptr;
    if (const QWindow *tp = window()->transientParent())
        if (const QWindowsWindow *tw = QWindowsWindow::windowsWindowOf(tp))
            if (!tw->testFlag(WithinDestroy)) // Prevent destruction by parent window (QTBUG-35499, QTBUG-36666)
                newTransientParent = tw->handle();
 
    // QTSOLBUG-71: When using the MFC/winmigrate solution, it is possible that a child
    // window is found, which can cause issues with modality. Loop up to top level.
    while (newTransientParent && (GetWindowLongPtr(newTransientParent, GWL_STYLE) & WS_CHILD) != 0)
        newTransientParent = GetParent(newTransientParent);
 
    if (newTransientParent != oldTransientParent)
        SetWindowLongPtr(m_data.hwnd, GWL_HWNDPARENT, LONG_PTR(newTransientParent));
}
 
static inline bool testShowWithoutActivating(const QWindow *window)
{
    // QWidget-attribute Qt::WA_ShowWithoutActivating .
    const QVariant showWithoutActivating = window->property("_q_showWithoutActivating");
    return showWithoutActivating.isValid() && showWithoutActivating.toBool();
}
 
static void setMinimizedGeometry(HWND hwnd, const QRect &r)
{
    WINDOWPLACEMENT windowPlacement;
    windowPlacement.length = sizeof(WINDOWPLACEMENT);
    if (GetWindowPlacement(hwnd, &windowPlacement)) {
        windowPlacement.showCmd = SW_SHOWMINIMIZED;
        windowPlacement.rcNormalPosition = RECTfromQRect(r);
        SetWindowPlacement(hwnd, &windowPlacement);
    }
}
 
static void setRestoreMaximizedFlag(HWND hwnd, bool set = true)
{
    // Let Windows know that we need to restore as maximized
    WINDOWPLACEMENT windowPlacement;
    windowPlacement.length = sizeof(WINDOWPLACEMENT);
    if (GetWindowPlacement(hwnd, &windowPlacement)) {
        if (set)
            windowPlacement.flags |= WPF_RESTORETOMAXIMIZED;
        else
            windowPlacement.flags &= ~WPF_RESTORETOMAXIMIZED;
        SetWindowPlacement(hwnd, &windowPlacement);
    }
}
 
// partially from QWidgetPrivate::show_sys()
void QWindowsWindow::show_sys() const
{
    int sm = SW_SHOWNORMAL;
    bool fakedMaximize = false;
    bool restoreMaximize = false;
    const QWindow *w = window();
    const Qt::WindowFlags flags = w->flags();
    const Qt::WindowType type = w->type();
    if (w->isTopLevel()) {
        const Qt::WindowStates state = w->windowStates();
        if (state & Qt::WindowMinimized) {
            sm = SW_SHOWMINIMIZED;
            if (!isVisible())
                sm = SW_SHOWMINNOACTIVE;
            if (state & Qt::WindowMaximized)
                restoreMaximize = true;
        } else {
            updateTransientParent();
            if (state & Qt::WindowMaximized) {
                sm = SW_SHOWMAXIMIZED;
                // Windows will not behave correctly when we try to maximize a window which does not
                // have minimize nor maximize buttons in the window frame. Windows would then ignore
                // non-available geometry, and rather maximize the widget to the full screen, minus the
                // window frame (caption). So, we do a trick here, by adding a maximize button before
                // maximizing the widget, and then remove the maximize button afterwards.
                if (flags & Qt::WindowTitleHint &&
                        !(flags & (Qt::WindowMinMaxButtonsHint | Qt::FramelessWindowHint))) {
                    fakedMaximize = TRUE;
                    setStyle(style() | WS_MAXIMIZEBOX);
                }
            } // Qt::WindowMaximized
        } // !Qt::WindowMinimized
    }
    if (type == Qt::Popup || type == Qt::ToolTip || type == Qt::Tool || testShowWithoutActivating(w))
        sm = SW_SHOWNOACTIVATE;
 
    if (w->windowStates() & Qt::WindowMaximized)
        setFlag(WithinMaximize); // QTBUG-8361
 
    ShowWindow(m_data.hwnd, sm);
 
    clearFlag(WithinMaximize);
 
    if (fakedMaximize) {
        setStyle(style() & ~WS_MAXIMIZEBOX);
        SetWindowPos(m_data.hwnd, nullptr, 0, 0, 0, 0,
                     SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER | SWP_NOOWNERZORDER
                     | SWP_FRAMECHANGED);
    }
    if (restoreMaximize)
        setRestoreMaximizedFlag(m_data.hwnd);
}
 
void QWindowsWindow::setParent(const QPlatformWindow *newParent)
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << window() << newParent;
 
    if (m_data.hwnd)
        setParent_sys(newParent);
}
 
void QWindowsWindow::setParent_sys(const QPlatformWindow *parent)
{
    // Use GetAncestor instead of GetParent, as GetParent can return owner window for toplevels
    HWND oldParentHWND = parentHwnd();
    HWND newParentHWND = nullptr;
    if (parent) {
        const auto *parentW = static_cast<const QWindowsWindow *>(parent);
        newParentHWND = parentW->handle();
 
    }
 
    // NULL handle means desktop window, which also has its proper handle -> disambiguate
    HWND desktopHwnd = GetDesktopWindow();
    if (oldParentHWND == desktopHwnd)
        oldParentHWND = nullptr;
    if (newParentHWND == desktopHwnd)
        newParentHWND = nullptr;
 
    if (newParentHWND != oldParentHWND) {
        const bool wasTopLevel = oldParentHWND == nullptr;
        const bool isTopLevel = newParentHWND == nullptr;
 
        setFlag(WithinSetParent);
        SetParent(m_data.hwnd, newParentHWND);
        clearFlag(WithinSetParent);
 
        // WS_CHILD/WS_POPUP must be manually set/cleared in addition
        // to dialog frames, etc (see  SetParent() ) if the top level state changes.
        // Force toplevel state as QWindow::isTopLevel cannot be relied upon here.
        if (wasTopLevel != isTopLevel) {
            setDropSiteEnabled(false);
            setWindowFlags_sys(window()->flags(), unsigned(isTopLevel ? WindowCreationData::ForceTopLevel : WindowCreationData::ForceChild));
            updateDropSite(isTopLevel);
        }
    }
}
 
void QWindowsWindow::handleHidden()
{
    fireExpose(QRegion());
}
 
void QWindowsWindow::handleCompositionSettingsChanged()
{
    const QWindow *w = window();
    if ((w->surfaceType() == QWindow::OpenGLSurface
         || w->surfaceType() == QWindow::VulkanSurface
         || w->surfaceType() == QWindow::Direct3DSurface)
        && w->format().hasAlpha())
    {
        applyBlurBehindWindow(handle());
    }
}
 
qreal QWindowsWindow::dpiRelativeScale(const UINT dpi) const
{
    return QHighDpiScaling::roundScaleFactor(qreal(dpi) / QWindowsScreen::baseDpi) /
           QHighDpiScaling::roundScaleFactor(qreal(savedDpi()) / QWindowsScreen::baseDpi);
}
 
void QWindowsWindow::handleDpiScaledSize(WPARAM wParam, LPARAM lParam, LRESULT *result)
{
    // We want to keep QWindow's device independent size constant across the
    // DPI change. To accomplish this, scale QPlatformWindow's native size
    // by the change of DPI (e.g. 120 -> 144 = 1.2), also taking any scale
    // factor rounding into account. The win32 window size includes the margins;
    // add the margins for the new DPI to the window size.
    const UINT dpi = UINT(wParam);
    const qreal scale = dpiRelativeScale(dpi);
    const QMargins margins = fullFrameMargins();
    if (!(m_data.flags & Qt::FramelessWindowHint)) {
        // We need to update the custom margins to match the current DPI, because
        // we don't want our users manually hook into this message just to set a
        // new margin, but here we can't call setCustomMargins() directly, that
        // function will change the window geometry which conflicts with what we
        // are currently doing.
        m_data.customMargins *= scale;
    }
 
    const QSize windowSize = (geometry().size() * scale).grownBy((margins * scale) + customMargins());
    SIZE *size = reinterpret_cast<SIZE *>(lParam);
    size->cx = windowSize.width();
    size->cy = windowSize.height();
    *result = true; // Inform Windows that we've set a size
}
 
void QWindowsWindow::handleDpiChanged(HWND hwnd, WPARAM wParam, LPARAM lParam)
{
    const UINT dpi = HIWORD(wParam);
    const qreal scale = dpiRelativeScale(dpi);
    setSavedDpi(dpi);
 
    QWindowsThemeCache::clearThemeCache(hwnd);
 
    // Send screen change first, so that the new screen is set during any following resize
    checkForScreenChanged(QWindowsWindow::FromDpiChange);
 
    if (!IsZoomed(hwnd))
        m_data.restoreGeometry.setSize(m_data.restoreGeometry.size() * scale);
 
    // We get WM_DPICHANGED in one of two situations:
    //
    // 1. The DPI change is a "spontaneous" DPI change as a result of e.g.
    // the user dragging the window to a new screen. In this case Windows
    // first sends WM_GETDPISCALEDSIZE, where we set the new window size,
    // followed by this event where we apply the suggested window geometry
    // to the native window. This will make sure the window tracks the mouse
    // cursor during screen change, and also that the window size is scaled
    // according to the DPI change.
    //
    // 2. The DPI change is a result of a setGeometry() call. In this case
    // Qt has already scaled the window size for the new DPI. Further, Windows
    // does not call WM_GETDPISCALEDSIZE, and also applies its own scaling
    // to the already scaled window size. Since there is no need to set the
    // window geometry again, and the provided geometry is incorrect, we omit
    // making the SetWindowPos() call.
    if (!m_inSetgeometry) {
        updateFullFrameMargins();
        const auto prcNewWindow = reinterpret_cast<RECT *>(lParam);
        SetWindowPos(hwnd, nullptr, prcNewWindow->left, prcNewWindow->top,
                     prcNewWindow->right - prcNewWindow->left,
                     prcNewWindow->bottom - prcNewWindow->top, SWP_NOZORDER | SWP_NOACTIVATE);
        // If the window does not have a frame, WM_MOVE and WM_SIZE won't be
        // called which prevents the content from being scaled appropriately
        // after a DPI change.
        if (shouldOmitFrameAdjustment(m_data.flags, m_data.hwnd))
            handleGeometryChange();
    }
 
    // Re-apply mask now that we have a new DPI, which have resulted in
    // a new scale factor.
    setMask(QHighDpi::toNativeLocalRegion(window()->mask(), window()));
}
 
void QWindowsWindow::handleDpiChangedAfterParent(HWND hwnd)
{
    const UINT dpi = GetDpiForWindow(hwnd);
    const qreal scale = dpiRelativeScale(dpi);
    setSavedDpi(dpi);
 
    checkForScreenChanged(QWindowsWindow::FromDpiChange);
 
    // Child windows do not get WM_GETDPISCALEDSIZE messages to inform
    // Windows about the new size, so we need to manually scale them.
    QRect currentGeometry = geometry();
    QRect scaledGeometry = QRect(currentGeometry.topLeft() * scale, currentGeometry.size() * scale);
    setGeometry(scaledGeometry);
}
 
static QRect normalFrameGeometry(HWND hwnd)
{
    WINDOWPLACEMENT wp;
    wp.length = sizeof(WINDOWPLACEMENT);
    if (GetWindowPlacement(hwnd, &wp)) {
        const QRect result = qrectFromRECT(wp.rcNormalPosition);
        return result.translated(windowPlacementOffset(hwnd, result.topLeft()));
    }
    return QRect();
}
 
QRect QWindowsWindow::normalGeometry() const
{
    // Check for fake 'fullscreen' mode.
    const bool fakeFullScreen =
        m_savedFrameGeometry.isValid() && (window()->windowStates() & Qt::WindowFullScreen);
    const QRect frame = fakeFullScreen ? m_savedFrameGeometry : normalFrameGeometry(m_data.hwnd);
    const QMargins margins = fakeFullScreen
        ? QWindowsGeometryHint::frame(window(), handle(), m_savedStyle, 0)
        : fullFrameMargins();
    return frame.isValid() ? frame.marginsRemoved(margins) : frame;
}
 
static QString msgUnableToSetGeometry(const QWindowsWindow *platformWindow,
                                      const QRect &requestedRect,
                                      const QRect &obtainedRect,
                                      const QMargins &fullMargins,
                                      const QMargins &customMargins)
{
    QString result;
    QDebug debug(&result);
    debug.nospace();
    debug.noquote();
    const auto window = platformWindow->window();
    debug << "Unable to set geometry ";
    formatBriefRectangle(debug, requestedRect);
    debug << " (frame: ";
    formatBriefRectangle(debug, requestedRect + fullMargins);
    debug << ") on " << window->metaObject()->className() << "/\""
          << window->objectName() << "\" on \"" << window->screen()->name()
          << "\". Resulting geometry: ";
    formatBriefRectangle(debug, obtainedRect);
    debug << " (frame: ";
    formatBriefRectangle(debug, obtainedRect + fullMargins);
    debug << ") margins: ";
    formatBriefMargins(debug, fullMargins);
    if (!customMargins.isNull()) {
       debug << " custom margin: ";
       formatBriefMargins(debug, customMargins);
    }
    const auto minimumSize = window->minimumSize();
    const bool hasMinimumSize = !minimumSize.isEmpty();
    if (hasMinimumSize)
        debug << " minimum size: " << minimumSize.width() << 'x' << minimumSize.height();
    const auto maximumSize = window->maximumSize();
    const bool hasMaximumSize = maximumSize.width() != QWINDOWSIZE_MAX || maximumSize.height() != QWINDOWSIZE_MAX;
    if (hasMaximumSize)
        debug << " maximum size: " << maximumSize.width() << 'x' << maximumSize.height();
    if (hasMinimumSize || hasMaximumSize) {
        MINMAXINFO minmaxInfo;
        memset(&minmaxInfo, 0, sizeof(minmaxInfo));
        platformWindow->getSizeHints(&minmaxInfo);
        debug << ' ' << minmaxInfo;
    }
    debug << ')';
    return result;
}
 
void QWindowsWindow::setGeometry(const QRect &rectIn)
{
    QBoolBlocker b(m_inSetgeometry);
 
    QRect rect = rectIn;
    // This means it is a call from QWindow::setFramePosition() and
    // the coordinates include the frame (size is still the contents rectangle).
    if (QWindowsGeometryHint::positionIncludesFrame(window())) {
        const QMargins margins = frameMargins();
        rect.moveTopLeft(rect.topLeft() + QPoint(margins.left(), margins.top()));
    }
 
    if (m_windowState & Qt::WindowMinimized)
        m_data.geometry = rect; // Otherwise set by handleGeometryChange() triggered by event.
    else
        setWindowState(Qt::WindowNoState);// Update window state to WindowNoState unless minimized
 
    if (m_data.hwnd) {
        // A ResizeEvent with resulting geometry will be sent. If we cannot
        // achieve that size (for example, window title minimal constraint),
        // notify and warn.
        setFlag(WithinSetGeometry);
        setGeometry_sys(rect);
        clearFlag(WithinSetGeometry);
        if (m_data.geometry != rect && (isVisible() || QLibraryInfo::isDebugBuild())) {
            const auto warning =
                msgUnableToSetGeometry(this, rectIn, m_data.geometry,
                                       fullFrameMargins(), customMargins());
            qWarning("%s: %s", __FUNCTION__, qPrintable(warning));
        }
    } else {
        QPlatformWindow::setGeometry(rect);
    }
}
 
void QWindowsWindow::handleMoved()
{
    // Minimize/Set parent can send nonsensical move events.
    if (!IsIconic(m_data.hwnd) && !testFlag(WithinSetParent))
        handleGeometryChange();
}
 
void QWindowsWindow::handleResized(int wParam, LPARAM lParam)
{
    /* Prevents borderless windows from covering the taskbar when maximized. */
    if ((m_data.flags.testFlag(Qt::FramelessWindowHint)
         || (m_data.flags.testFlag(Qt::CustomizeWindowHint) && !m_data.flags.testFlag(Qt::WindowTitleHint)))
        && IsZoomed(m_data.hwnd)) {
        const int resizedWidth = LOWORD(lParam);
        const int resizedHeight = HIWORD(lParam);
 
        const HMONITOR monitor = MonitorFromWindow(m_data.hwnd, MONITOR_DEFAULTTOPRIMARY);
        MONITORINFO monitorInfo = {};
        monitorInfo.cbSize = sizeof(MONITORINFO);
        GetMonitorInfoW(monitor, &monitorInfo);
 
        int correctLeft = monitorInfo.rcMonitor.left;
        int correctTop = monitorInfo.rcMonitor.top;
        int correctWidth = monitorInfo.rcWork.right - monitorInfo.rcWork.left;
        int correctHeight = monitorInfo.rcWork.bottom - monitorInfo.rcWork.top;
 
        if (!m_data.flags.testFlag(Qt::FramelessWindowHint)) {
            const int borderWidth = invisibleMargins(m_data.hwnd).left();
            correctLeft -= borderWidth;
            correctTop -= borderWidth;
            correctWidth += borderWidth * 2;
            correctHeight += borderWidth * 2;
        }
 
        if (resizedWidth != correctWidth || resizedHeight != correctHeight) {
            qCDebug(lcQpaWindow) << __FUNCTION__ << "correcting: " << resizedWidth << "x"
                                 << resizedHeight << " -> " << correctWidth << "x" << correctHeight;
            SetWindowPos(m_data.hwnd, nullptr, correctLeft, correctTop, correctWidth, correctHeight,
                         SWP_NOZORDER | SWP_NOACTIVATE);
        }
    }
 
    switch (wParam) {
    case SIZE_MAXHIDE: // Some other window affected.
    case SIZE_MAXSHOW:
        return;
    case SIZE_MINIMIZED: // QTBUG-53577, prevent state change events during programmatic state change
        if (!testFlag(WithinSetStyle) && !testFlag(WithinSetGeometry))
            handleWindowStateChange(m_windowState | Qt::WindowMinimized);
        return;
    case SIZE_MAXIMIZED:
        handleGeometryChange();
        if (!testFlag(WithinSetStyle) && !testFlag(WithinSetGeometry))
            handleWindowStateChange(Qt::WindowMaximized | (isFullScreen_sys() ? Qt::WindowFullScreen
                                                                              : Qt::WindowNoState));
        break;
    case SIZE_RESTORED:
        handleGeometryChange();
        if (!testFlag(WithinSetStyle) && !testFlag(WithinSetGeometry)) {
            if (isFullScreen_sys())
                handleWindowStateChange(
                    Qt::WindowFullScreen
                    | (testFlag(MaximizeToFullScreen) ? Qt::WindowMaximized : Qt::WindowNoState));
            else if (m_windowState != Qt::WindowNoState && !testFlag(MaximizeToFullScreen))
                handleWindowStateChange(Qt::WindowNoState);
        }
        break;
    }
}
 
static inline bool equalDpi(const QDpi &d1, const QDpi &d2)
{
    return qFuzzyCompare(d1.first, d2.first) && qFuzzyCompare(d1.second, d2.second);
}
 
void QWindowsWindow::checkForScreenChanged(ScreenChangeMode mode)
{
    if ((parent() && !parent()->isForeignWindow()) || QWindowsScreenManager::isSingleScreen())
        return;
 
    QPlatformScreen *currentScreen = screen();
    auto topLevel = isTopLevel_sys() ? m_data.hwnd : GetAncestor(m_data.hwnd, GA_ROOT);
    const QWindowsScreen *newScreen =
        QWindowsContext::instance()->screenManager().screenForHwnd(topLevel);
 
    if (newScreen == nullptr || newScreen == currentScreen)
        return;
    // For screens with different DPI: postpone until WM_DPICHANGE
    // Check on currentScreen as it can be 0 when resuming a session (QTBUG-80436).
    const bool changingDpi = !equalDpi(QDpi(savedDpi(), savedDpi()), newScreen->logicalDpi());
    if (mode == FromGeometryChange && currentScreen != nullptr && changingDpi)
        return;
 
    qCDebug(lcQpaWindow).noquote().nospace() << __FUNCTION__
        << ' ' << window() << " \"" << (currentScreen ? currentScreen->name() : QString())
        << "\"->\"" << newScreen->name() << '"';
    updateFullFrameMargins();
    QWindowSystemInterface::handleWindowScreenChanged<QWindowSystemInterface::SynchronousDelivery>(window(), newScreen->screen());
}
 
void QWindowsWindow::handleGeometryChange()
{
    const QRect previousGeometry = m_data.geometry;
    m_data.geometry = geometry_sys();
    updateFullFrameMargins();
    QWindowSystemInterface::handleGeometryChange(window(), m_data.geometry);
    // QTBUG-32121: OpenGL/normal windows (with exception of ANGLE
    // which we no longer support in Qt 6) do not receive expose
    // events when shrinking, synthesize.
    if (isExposed()
        && m_data.geometry.size() != previousGeometry.size() // Exclude plain move
        // One dimension grew -> Windows will send expose, no need to synthesize.
        && !(m_data.geometry.width() > previousGeometry.width() || m_data.geometry.height() > previousGeometry.height())) {
        fireFullExpose(true);
    }
 
    const bool wasSync = testFlag(SynchronousGeometryChangeEvent);
    checkForScreenChanged();
 
    if (testFlag(SynchronousGeometryChangeEvent))
        QWindowSystemInterface::flushWindowSystemEvents(QEventLoop::ExcludeUserInputEvents);
 
    if (!testFlag(ResizeMoveActive))
        updateRestoreGeometry();
 
    if (!wasSync)
        clearFlag(SynchronousGeometryChangeEvent);
    qCDebug(lcQpaEvents) << __FUNCTION__ << this << window() << m_data.geometry;
}
 
void QWindowsBaseWindow::setGeometry_sys(const QRect &rect) const
{
    const QMargins margins = fullFrameMargins();
    const QRect frameGeometry = rect + margins;
 
    qCDebug(lcQpaWindow) << '>' << __FUNCTION__ << window()
        << "\n from " << geometry_sys() << " frame: "
        << margins << " to " <<rect
        << " new frame: " << frameGeometry;
 
    bool result = false;
    const HWND hwnd = handle();
    WINDOWPLACEMENT windowPlacement;
    windowPlacement.length = sizeof(WINDOWPLACEMENT);
    GetWindowPlacement(hwnd, &windowPlacement);
    // If the window is hidden and in maximized state or minimized, instead of moving the
    // window, set the normal position of the window.
    if ((windowPlacement.showCmd == SW_MAXIMIZE && !IsWindowVisible(hwnd))
        || windowPlacement.showCmd == SW_SHOWMINIMIZED) {
        windowPlacement.rcNormalPosition =
            RECTfromQRect(frameGeometry.translated(-windowPlacementOffset(hwnd, frameGeometry.topLeft())));
        windowPlacement.showCmd = windowPlacement.showCmd == SW_SHOWMINIMIZED ? SW_SHOWMINIMIZED : SW_HIDE;
        result = SetWindowPlacement(hwnd, &windowPlacement);
    } else {
        int x = frameGeometry.x();
        if (!window()->isTopLevel()) {
            const HWND parentHandle = GetParent(hwnd);
            if (isRtlLayout(parentHandle)) {
                RECT rect;
                GetClientRect(parentHandle, &rect);
                x = rect.right - frameGeometry.width() - x;
            }
        }
        result = MoveWindow(hwnd, x, frameGeometry.y(),
                            frameGeometry.width(), frameGeometry.height(), true);
    }
    qCDebug(lcQpaWindow) << '<' << __FUNCTION__ << window()
        << "\n resulting " << result << geometry_sys();
}
 
HDC QWindowsWindow::getDC()
{
    if (!m_hdc) {
        m_hdc = GetDC(handle());
        if (QGuiApplication::layoutDirection() == Qt::RightToLeft)
            SetLayout(m_hdc, 0); // Clear RTL layout
    }
    return m_hdc;
}
 
void QWindowsWindow::releaseDC()
{
    if (m_hdc) {
        ReleaseDC(handle(), m_hdc);
        m_hdc = nullptr;
    }
}
 
static inline bool isSoftwareGl()
{
#if QT_CONFIG(dynamicgl)
    return QOpenGLStaticContext::opengl32.moduleIsNotOpengl32()
        && QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL;
#else
    return false;
#endif // dynamicgl
}
 
bool QWindowsWindow::handleWmPaint(HWND hwnd, UINT message,
                                         WPARAM, LPARAM, LRESULT *result)
{
    if (message == WM_ERASEBKGND) { // Backing store - ignored.
        *result = 1;
        return true;
    }
    // QTBUG-75455: Suppress WM_PAINT sent to invisible windows when setting WS_EX_LAYERED
    if (!window()->isVisible() && (GetWindowLongPtr(hwnd, GWL_EXSTYLE) & WS_EX_LAYERED) != 0)
        return false;
    // Ignore invalid update bounding rectangles
    if (!GetUpdateRect(m_data.hwnd, 0, FALSE))
        return false;
    PAINTSTRUCT ps;
 
    // GL software rendering (QTBUG-58178) with some AMD cards
    // (QTBUG-60527) need InvalidateRect() to suppress artifacts while resizing.
    if (testFlag(OpenGLSurface) && isSoftwareGl())
        InvalidateRect(hwnd, nullptr, false);
 
    BeginPaint(hwnd, &ps);
 
    // If the a window is obscured by another window (such as a child window)
    // we still need to send isExposed=true, for compatibility.
    // Our tests depend on it.
    fireExpose(QRegion(qrectFromRECT(ps.rcPaint)), true);
    if (!QWindowsContext::instance()->asyncExpose())
        QWindowSystemInterface::flushWindowSystemEvents(QEventLoop::ExcludeUserInputEvents);
 
    EndPaint(hwnd, &ps);
    return true;
}
 
void QWindowsWindow::setWindowTitle(const QString &title)
{
    setWindowTitle_sys(QWindowsWindow::formatWindowTitle(title));
}
 
void QWindowsWindow::setWindowFlags(Qt::WindowFlags flags)
{
    qCDebug(lcQpaWindow) << '>' << __FUNCTION__ << this << window() << "\n    from: "
        << m_data.flags << "\n    to: " << flags;
    const QRect oldGeometry = geometry();
    if (m_data.flags != flags) {
        m_data.flags = flags;
        if (m_data.hwnd) {
            m_data = setWindowFlags_sys(flags);
            updateDropSite(window()->isTopLevel());
        }
    }
    // When switching to a frameless window, geometry
    // may change without a WM_MOVE. Report change manually.
    // Do not send synchronously as not to clobber the widget
    // geometry in a sequence of setting flags and geometry.
    const QRect newGeometry = geometry_sys();
    if (oldGeometry != newGeometry)
        handleGeometryChange();
 
    qCDebug(lcQpaWindow) << '<' << __FUNCTION__ << "\n    returns: "
        << m_data.flags << " geometry " << oldGeometry << "->" << newGeometry;
}
 
QWindowsWindowData QWindowsWindow::setWindowFlags_sys(Qt::WindowFlags wt,
                                                              unsigned flags) const
{
    WindowCreationData creationData;
    creationData.fromWindow(window(), wt, flags);
    creationData.applyWindowFlags(m_data.hwnd);
    creationData.initialize(window(), m_data.hwnd, true, m_opacity);
 
    QWindowsWindowData result = m_data;
    result.flags = creationData.flags;
    result.embedded = creationData.embedded;
    result.hasFrame = (creationData.style & (WS_DLGFRAME | WS_THICKFRAME))
            && !(creationData.flags & Qt::FramelessWindowHint);
    return result;
}
 
void QWindowsWindow::handleWindowStateChange(Qt::WindowStates state)
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << this << window()
                 << "\n    from " << m_windowState << " to " << state;
    m_windowState = state;
    QWindowSystemInterface::handleWindowStateChanged(window(), state);
    if (state & Qt::WindowMinimized) {
        handleHidden();
        QWindowSystemInterface::flushWindowSystemEvents(QEventLoop::ExcludeUserInputEvents); // Tell QQuickWindow to stop rendering now.
    } else {
        if (state & Qt::WindowMaximized) {
            WINDOWPLACEMENT windowPlacement{};
            windowPlacement.length = sizeof(WINDOWPLACEMENT);
            GetWindowPlacement(m_data.hwnd, &windowPlacement);
            const RECT geometry = RECTfromQRect(m_data.restoreGeometry);
            windowPlacement.rcNormalPosition = geometry;
            SetWindowPlacement(m_data.hwnd, &windowPlacement);
        }
        // QTBUG-17548: We send expose events when receiving WM_Paint, but for
        // layered windows and transient children, we won't receive any WM_Paint.
        QWindow *w = window();
        bool exposeEventsSent = false;
        if (isLayered()) {
            fireFullExpose();
            exposeEventsSent = true;
        }
        const QWindowList allWindows = QGuiApplication::allWindows();
        for (QWindow *child : allWindows) {
            if (child != w && child->isVisible() && child->transientParent() == w) {
                QWindowsWindow *platformWindow = QWindowsWindow::windowsWindowOf(child);
                if (platformWindow && platformWindow->isLayered()) {
                    platformWindow->fireFullExpose();
                    exposeEventsSent = true;
                }
            }
        }
        if (exposeEventsSent && !QWindowsContext::instance()->asyncExpose())
            QWindowSystemInterface::flushWindowSystemEvents(QEventLoop::ExcludeUserInputEvents);
    }
}
 
void QWindowsWindow::updateRestoreGeometry()
{
    m_data.restoreGeometry = normalFrameGeometry(m_data.hwnd);
}
 
void QWindowsWindow::setWindowState(Qt::WindowStates state)
{
    if (m_data.hwnd) {
        setWindowState_sys(state);
        m_windowState = state;
    }
}
 
bool QWindowsWindow::isFullScreen_sys() const
{
    const QWindow *w = window();
    if (!w->isTopLevel())
        return false;
    QRect geometry = geometry_sys();
    if (testFlag(HasBorderInFullScreen))
        geometry += QMargins(1, 1, 1, 1);
    QPlatformScreen *screen = screenForGeometry(geometry);
    return screen && geometry == screen->geometry();
}
 
void QWindowsWindow::setWindowState_sys(Qt::WindowStates newState)
{
    const Qt::WindowStates oldState = m_windowState;
    if (oldState == newState)
        return;
    qCDebug(lcQpaWindow) << '>' << __FUNCTION__ << this << window()
        << " from " << oldState << " to " << newState;
 
    const bool visible = isVisible();
    auto stateChange = oldState ^ newState;
 
    if (stateChange & Qt::WindowFullScreen) {
        if (newState & Qt::WindowFullScreen) {
            UINT newStyle = WS_CLIPCHILDREN | WS_CLIPSIBLINGS | WS_POPUP;
            // Save geometry and style to be restored when fullscreen
            // is turned off again, since on Windows, it is not a real
            // Window state but emulated by changing geometry and style.
            if (!m_savedStyle) {
                m_savedStyle = style();
                if ((oldState & Qt::WindowMinimized) || (oldState & Qt::WindowMaximized)) {
                    const QRect nf = normalFrameGeometry(m_data.hwnd);
                    if (nf.isValid())
                        m_savedFrameGeometry = nf;
                } else {
                    m_savedFrameGeometry = frameGeometry_sys();
                }
            }
            if (newState & Qt::WindowMaximized)
                setFlag(MaximizeToFullScreen);
            if (m_savedStyle & WS_SYSMENU)
                newStyle |= WS_SYSMENU;
            if (visible)
                newStyle |= WS_VISIBLE;
            if (testFlag(HasBorderInFullScreen))
                newStyle |= WS_BORDER;
            setStyle(newStyle);
            const HMONITOR monitor = MonitorFromWindow(m_data.hwnd, MONITOR_DEFAULTTONEAREST);
            MONITORINFO monitorInfo = {};
            monitorInfo.cbSize = sizeof(MONITORINFO);
            GetMonitorInfoW(monitor, &monitorInfo);
            const QRect screenGeometry(monitorInfo.rcMonitor.left, monitorInfo.rcMonitor.top,
                                       monitorInfo.rcMonitor.right - monitorInfo.rcMonitor.left,
                                       monitorInfo.rcMonitor.bottom - monitorInfo.rcMonitor.top);
            if (newState & Qt::WindowMinimized) {
                setMinimizedGeometry(m_data.hwnd, screenGeometry);
                if (stateChange & Qt::WindowMaximized)
                    setRestoreMaximizedFlag(m_data.hwnd, newState & Qt::WindowMaximized);
            } else {
                const UINT swpf = SWP_FRAMECHANGED | SWP_NOACTIVATE;
                const bool wasSync = testFlag(SynchronousGeometryChangeEvent);
                setFlag(SynchronousGeometryChangeEvent);
                SetWindowPos(m_data.hwnd, HWND_TOP, screenGeometry.left(), screenGeometry.top(), screenGeometry.width(), screenGeometry.height(), swpf);
                if (!wasSync)
                    clearFlag(SynchronousGeometryChangeEvent);
                clearFlag(MaximizeToFullScreen);
                QWindowSystemInterface::handleGeometryChange(window(), screenGeometry);
                QWindowSystemInterface::flushWindowSystemEvents(QEventLoop::ExcludeUserInputEvents);
            }
        } else {
            // Restore saved state.
            unsigned newStyle = m_savedStyle ? m_savedStyle : style();
            if (visible)
                newStyle |= WS_VISIBLE;
            setStyle(newStyle);
 
            const QScreen *screen = window()->screen();
            if (!screen)
                screen = QGuiApplication::primaryScreen();
            // That area of the virtual desktop might not be covered by a screen anymore.
            if (const auto platformScreen = screen->handle()) {
                if (!platformScreen->geometry().intersects(m_savedFrameGeometry))
                    m_savedFrameGeometry.moveTo(platformScreen->geometry().topLeft());
            }
 
            if (newState & Qt::WindowMinimized) {
                setMinimizedGeometry(m_data.hwnd, m_savedFrameGeometry);
                if (stateChange & Qt::WindowMaximized)
                    setRestoreMaximizedFlag(m_data.hwnd, newState & Qt::WindowMaximized);
            } else {
                UINT swpf = SWP_FRAMECHANGED | SWP_NOZORDER | SWP_NOACTIVATE;
                if (!m_savedFrameGeometry.isValid())
                    swpf |= SWP_NOSIZE | SWP_NOMOVE;
                const bool wasSync = testFlag(SynchronousGeometryChangeEvent);
                setFlag(SynchronousGeometryChangeEvent);
                // After maximized/fullscreen; the window can be in a maximized state. Clear
                // it before applying the normal geometry.
                if (windowVisibility_sys(m_data.hwnd) == QWindow::Maximized)
                    ShowWindow(m_data.hwnd, SW_SHOWNOACTIVATE);
                SetWindowPos(m_data.hwnd, nullptr, m_savedFrameGeometry.x(), m_savedFrameGeometry.y(),
                             m_savedFrameGeometry.width(), m_savedFrameGeometry.height(), swpf);
                if (!wasSync)
                    clearFlag(SynchronousGeometryChangeEvent);
                // preserve maximized state
                if (visible) {
                    setFlag(WithinMaximize);
                    ShowWindow(m_data.hwnd,
                               (newState & Qt::WindowMaximized) ? SW_MAXIMIZE : SW_SHOWNA);
                    clearFlag(WithinMaximize);
                }
            }
            m_savedStyle = 0;
            m_savedFrameGeometry = QRect();
        }
    } else if ((oldState & Qt::WindowMaximized) != (newState & Qt::WindowMaximized)) {
        if (visible && !(newState & Qt::WindowMinimized)) {
            setFlag(WithinMaximize);
            if (newState & Qt::WindowFullScreen)
                setFlag(MaximizeToFullScreen);
            ShowWindow(m_data.hwnd,
                       (newState & Qt::WindowMaximized) ? SW_MAXIMIZE : SW_SHOWNOACTIVATE);
            clearFlag(WithinMaximize);
            clearFlag(MaximizeToFullScreen);
        } else if (visible && (oldState & newState & Qt::WindowMinimized)) {
            // change of the maximized state while keeping minimized
            setRestoreMaximizedFlag(m_data.hwnd, newState & Qt::WindowMaximized);
        }
    }
 
    if (stateChange & Qt::WindowMinimized) {
        if (visible) {
            ShowWindow(m_data.hwnd,
                       (newState & Qt::WindowMinimized) ? SW_MINIMIZE :
                       (newState & Qt::WindowMaximized) ? SW_MAXIMIZE : SW_SHOWNORMAL);
            if ((newState & Qt::WindowMinimized) && (stateChange & Qt::WindowMaximized))
                setRestoreMaximizedFlag(m_data.hwnd, newState & Qt::WindowMaximized);
        }
    }
    qCDebug(lcQpaWindow) << '<' << __FUNCTION__ << this << window() << newState;
}
 
void QWindowsWindow::setStyle(unsigned s) const
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << this << window() << debugWinStyle(s);
    setFlag(WithinSetStyle);
    SetWindowLongPtr(m_data.hwnd, GWL_STYLE, s);
    clearFlag(WithinSetStyle);
}
 
void QWindowsWindow::setExStyle(unsigned s) const
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << this << window() << debugWinExStyle(s);
    SetWindowLongPtr(m_data.hwnd, GWL_EXSTYLE, s);
}
 
bool QWindowsWindow::windowEvent(QEvent *event)
{
    switch (event->type()) {
    case QEvent::ApplicationPaletteChange:
        setDarkBorder(QWindowsTheme::instance()->colorScheme() == Qt::ColorScheme::Dark);
        break;
    case QEvent::WindowBlocked: // Blocked by another modal window.
        setEnabled(false);
        setFlag(BlockedByModal);
        if (hasMouseCapture())
            ReleaseCapture();
        break;
    case QEvent::WindowUnblocked:
        setEnabled(true);
        clearFlag(BlockedByModal);
        break;
    default:
        break;
    }
 
    return QPlatformWindow::windowEvent(event);
}
 
void QWindowsWindow::propagateSizeHints()
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << this << window();
}
 
bool QWindowsWindow::handleGeometryChangingMessage(MSG *message, const QWindow *qWindow, const QMargins &margins)
{
    auto *windowPos = reinterpret_cast<WINDOWPOS *>(message->lParam);
    const QRect suggestedFrameGeometry(windowPos->x, windowPos->y,
                                       windowPos->cx, windowPos->cy);
    const QRect suggestedGeometry = suggestedFrameGeometry - margins;
 
    // Tell Windows to discard the entire contents of the client area, as re-using
    // parts of the client area would lead to jitter during resize.
    // Check the suggestedGeometry against the current one to only discard during
    // resize, and not a plain move. We also look for SWP_NOSIZE since that, too,
    // implies an identical size, and comparing QRects wouldn't work with null cx/cy
    if (!(windowPos->flags & SWP_NOSIZE) && suggestedGeometry.size() != qWindow->geometry().size())
        windowPos->flags |= SWP_NOCOPYBITS;
 
    if ((windowPos->flags & SWP_NOZORDER) == 0) {
        if (QWindowsWindow *platformWindow = QWindowsWindow::windowsWindowOf(qWindow)) {
            QWindow *parentWindow = qWindow->parent();
            HWND parentHWND = GetAncestor(windowPos->hwnd, GA_PARENT);
            HWND desktopHWND = GetDesktopWindow();
            platformWindow->m_data.embedded = !parentWindow && parentHWND && (parentHWND != desktopHWND);
        }
        if (qWindow->flags().testFlag(Qt::WindowStaysOnBottomHint))
            windowPos->hwndInsertAfter = HWND_BOTTOM;
    }
    if (!qWindow->isTopLevel()) // Implement hasHeightForWidth().
        return false;
    if (windowPos->flags & SWP_NOSIZE)
        return false;
    const QRectF correctedGeometryF = QPlatformWindow::closestAcceptableGeometry(qWindow, suggestedGeometry);
    if (!correctedGeometryF.isValid())
        return false;
    const QRect correctedFrameGeometry = correctedGeometryF.toRect() + margins;
    if (correctedFrameGeometry == suggestedFrameGeometry)
        return false;
    windowPos->x = correctedFrameGeometry.left();
    windowPos->y = correctedFrameGeometry.top();
    windowPos->cx = correctedFrameGeometry.width();
    windowPos->cy = correctedFrameGeometry.height();
    return true;
}
 
bool QWindowsWindow::handleGeometryChanging(MSG *message) const
{
    const QMargins margins = window()->isTopLevel() ? fullFrameMargins() : QMargins();
    return QWindowsWindow::handleGeometryChangingMessage(message, window(), margins);
}
 
void QWindowsWindow::setFullFrameMargins(const QMargins &newMargins)
{
    if (shouldOmitFrameAdjustment(m_data.flags, m_data.hwnd))
        return;
    if (m_data.fullFrameMargins != newMargins) {
        qCDebug(lcQpaWindow) << __FUNCTION__ << window() <<  m_data.fullFrameMargins  << "->" << newMargins;
        m_data.fullFrameMargins = newMargins;
    }
}
 
void QWindowsWindow::updateFullFrameMargins()
{
    // QTBUG-82580: If a native menu is present, force a WM_NCCALCSIZE.
    if (GetMenu(m_data.hwnd))
        QWindowsContext::forceNcCalcSize(m_data.hwnd);
    else
        calculateFullFrameMargins();
}
 
void QWindowsWindow::calculateFullFrameMargins()
{
    if (shouldOmitFrameAdjustment(m_data.flags, m_data.hwnd))
        return;
 
    // QTBUG-113736: systemMargins depends on AdjustWindowRectExForDpi. This doesn't take into
    // account possible external modifications to the titlebar, as with ExtendsContentIntoTitleBar()
    // from the Windows App SDK. We can fix this by comparing the WindowRect (which includes the
    // frame) to the ClientRect. If a 'typical' frame is detected, i.e. only the titlebar has been
    // modified, we can safely adjust the frame by deducting the bottom margin to the total Y
    // difference between the two rects, to get the actual size of the titlebar and prevent
    // unwanted client area slicing.
 
    RECT windowRect{};
    RECT clientRect{};
    GetWindowRect(handle(), &windowRect);
    GetClientRect(handle(), &clientRect);
 
    // QTBUG-117704 It is also possible that the user has manually removed the frame (for example
    // by handling WM_NCCALCSIZE). If that is the case, i.e., the client area and the window area
    // have identical sizes, we don't want to override the user-defined margins.
 
    if (qrectFromRECT(windowRect).size() == qrectFromRECT(clientRect).size())
        return;
 
    // Normally obtained from WM_NCCALCSIZE. This calculation only works
    // when no native menu is present.
    const auto systemMargins = testFlag(DisableNonClientScaling)
        ? QWindowsGeometryHint::frameOnPrimaryScreen(window(), m_data.hwnd)
        : frameMargins_sys();
    const QMargins actualMargins = systemMargins + customMargins();
 
    const int yDiff = (windowRect.bottom - windowRect.top) - (clientRect.bottom - clientRect.top);
    const bool typicalFrame = (actualMargins.left() == actualMargins.right())
            && (actualMargins.right() == actualMargins.bottom());
 
    const QMargins adjustedMargins = typicalFrame ?
          QMargins(actualMargins.left(), (yDiff - actualMargins.bottom()),
                   actualMargins.right(), actualMargins.bottom())
            : actualMargins;
 
    setFullFrameMargins(adjustedMargins);
}
 
QMargins QWindowsWindow::frameMargins() const
{
    QMargins result = fullFrameMargins();
    if (isTopLevel() && m_data.hasFrame)
        result -= invisibleMargins(m_data.hwnd);
    return result;
}
 
QMargins QWindowsWindow::fullFrameMargins() const
{
    if (shouldOmitFrameAdjustment(m_data.flags, m_data.hwnd))
        return {};
    return m_data.fullFrameMargins;
}
 
void QWindowsWindow::setOpacity(qreal level)
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << level;
    if (!qFuzzyCompare(m_opacity, level)) {
        m_opacity = level;
        if (m_data.hwnd)
            setWindowOpacity(m_data.hwnd, m_data.flags,
                             window()->format().hasAlpha(), testFlag(OpenGLSurface) || testFlag(VulkanSurface) || testFlag(Direct3DSurface),
                             level);
    }
}
 
static inline HRGN createRectRegion(const QRect &r)
{
    return CreateRectRgn(r.left(), r.top(), r.x() + r.width(), r.y() + r.height());
}
 
static inline void addRectToWinRegion(const QRect &rect, HRGN *winRegion)
{
    if (const HRGN rectRegion = createRectRegion(rect)) {
        HRGN result = CreateRectRgn(0, 0, 0, 0);
        if (CombineRgn(result, *winRegion, rectRegion, RGN_OR)) {
            DeleteObject(*winRegion);
            *winRegion = result;
        }
        DeleteObject(rectRegion);
    }
}
 
static HRGN qRegionToWinRegion(const QRegion &region)
{
    auto it = region.begin();
    const auto end = region.end();
    if (it == end)
        return nullptr;
    HRGN hRegion = createRectRegion(*it);
    while (++it != end)
        addRectToWinRegion(*it, &hRegion);
    return hRegion;
}
 
void QWindowsWindow::setMask(const QRegion &region)
{
    if (region.isEmpty()) {
         SetWindowRgn(m_data.hwnd, nullptr, true);
         return;
    }
    const HRGN winRegion = qRegionToWinRegion(region);
 
    // Mask is in client area coordinates, so offset it in case we have a frame
    if (window()->isTopLevel()) {
        const QMargins margins = fullFrameMargins();
        OffsetRgn(winRegion, margins.left(), margins.top());
    }
 
    // SetWindowRgn takes ownership.
    if (!SetWindowRgn(m_data.hwnd, winRegion, true))
        DeleteObject(winRegion);
}
 
void QWindowsWindow::requestActivateWindow()
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << this << window();
 
    if (!m_data.hwnd)
        return;
 
    const auto activationBehavior = QWindowsIntegration::instance()->windowActivationBehavior();
    if (QGuiApplication::applicationState() == Qt::ApplicationActive
        || activationBehavior != QWindowsApplication::AlwaysActivateWindow) {
        SetForegroundWindow(m_data.hwnd);
        SetFocus(m_data.hwnd);
        return;
    }
 
    // Force activate this window. The following code will bring the window to the
    // foreground and activate it. If the window is hidden, it will show up. If
    // the window is minimized, it will restore to the previous position.
 
    // But first we need some sanity checks.
    if (m_data.flags & Qt::WindowStaysOnBottomHint) {
        qCWarning(lcQpaWindow) <<
            "Windows with Qt::WindowStaysOnBottomHint can't be brought to the foreground.";
        return;
    }
    if (m_data.flags & Qt::WindowStaysOnTopHint) {
        qCWarning(lcQpaWindow) <<
            "Windows with Qt::WindowStaysOnTopHint will always be on the foreground.";
        return;
    }
    if (window()->type() == Qt::ToolTip) {
        qCWarning(lcQpaWindow) << "ToolTip windows should not be activated.";
        return;
    }
 
    // We need to show the window first, otherwise we won't be able to bring it to front.
    if (!IsWindowVisible(m_data.hwnd))
        ShowWindow(m_data.hwnd, SW_SHOW);
 
    if (IsIconic(m_data.hwnd)) {
        ShowWindow(m_data.hwnd, SW_RESTORE);
        // When the window is restored, it will always become the foreground window.
        // So return early here, we don't need the following code to bring it to front.
        return;
    }
 
    // OK, our window is not minimized, so now we will try to bring it to front manually.
    const HWND oldForegroundWindow = GetForegroundWindow();
    if (!oldForegroundWindow) // It may be NULL, according to MS docs.
        return;
 
    // First try to send a message to the current foreground window to check whether
    // it is currently hanging or not.
    if (SendMessageTimeoutW(oldForegroundWindow, WM_NULL, 0, 0,
            SMTO_BLOCK | SMTO_ABORTIFHUNG | SMTO_NOTIMEOUTIFNOTHUNG, 1000, nullptr) == 0) {
        qCWarning(lcQpaWindow) << "The foreground window hangs, can't activate current window.";
        return;
    }
 
    const DWORD windowThreadProcessId = GetWindowThreadProcessId(oldForegroundWindow, nullptr);
    const DWORD currentThreadId = GetCurrentThreadId();
 
    AttachThreadInput(windowThreadProcessId, currentThreadId, TRUE);
    const auto cleanup = qScopeGuard([windowThreadProcessId, currentThreadId](){
        AttachThreadInput(windowThreadProcessId, currentThreadId, FALSE);
    });
 
    BringWindowToTop(m_data.hwnd);
 
    // Activate the window too. This will force us to the virtual desktop this
    // window is on, if it's on another virtual desktop.
    SetActiveWindow(m_data.hwnd);
}
 
bool QWindowsWindow::setKeyboardGrabEnabled(bool grab)
{
    if (!m_data.hwnd) {
        qWarning("%s: No handle", __FUNCTION__);
        return false;
    }
    qCDebug(lcQpaWindow) << __FUNCTION__ << this << window() << grab;
 
    QWindowsContext *context = QWindowsContext::instance();
    if (grab) {
        context->setKeyGrabber(window());
    } else {
        if (context->keyGrabber() == window())
            context->setKeyGrabber(nullptr);
    }
    return true;
}
 
bool QWindowsWindow::setMouseGrabEnabled(bool grab)
{
    qCDebug(lcQpaWindow) << __FUNCTION__ << window() << grab;
    if (!m_data.hwnd) {
        qWarning("%s: No handle", __FUNCTION__);
        return false;
    }
    if (!isVisible() && grab) {
        qWarning("%s: Not setting mouse grab for invisible window %s/'%s'",
                 __FUNCTION__, window()->metaObject()->className(),
                 qPrintable(window()->objectName()));
        return false;
    }
    // release grab or an explicit grab overriding autocapture: Clear flag.
    clearFlag(QWindowsWindow::AutoMouseCapture);
    if (hasMouseCapture() != grab) {
        if (grab) {
            SetCapture(m_data.hwnd);
        } else {
            ReleaseCapture();
        }
    }
    return grab;
}
 
static inline DWORD edgesToWinOrientation(Qt::Edges edges)
{
    if (edges == Qt::LeftEdge)
        return 0xf001; // SC_SIZELEFT;
    else if (edges == (Qt::RightEdge))
        return 0xf002; // SC_SIZERIGHT
    else if (edges == (Qt::TopEdge))
        return 0xf003; // SC_SIZETOP
    else if (edges == (Qt::TopEdge | Qt::LeftEdge))
        return 0xf004; // SC_SIZETOPLEFT
    else if (edges == (Qt::TopEdge | Qt::RightEdge))
        return 0xf005; // SC_SIZETOPRIGHT
    else if (edges == (Qt::BottomEdge))
        return 0xf006; // SC_SIZEBOTTOM
    else if (edges == (Qt::BottomEdge | Qt::LeftEdge))
        return 0xf007; // SC_SIZEBOTTOMLEFT
    else if (edges == (Qt::BottomEdge | Qt::RightEdge))
        return 0xf008; // SC_SIZEBOTTOMRIGHT
 
    return 0xf000; // SC_SIZE
}
 
bool QWindowsWindow::startSystemResize(Qt::Edges edges)
{
    if (Q_UNLIKELY(window()->flags().testFlag(Qt::MSWindowsFixedSizeDialogHint)))
        return false;
 
    ReleaseCapture();
    PostMessage(m_data.hwnd, WM_SYSCOMMAND, edgesToWinOrientation(edges), 0);
    setFlag(SizeGripOperation);
    return true;
}
 
bool QWindowsWindow::startSystemMove()
{
    ReleaseCapture();
    PostMessage(m_data.hwnd, WM_SYSCOMMAND, 0xF012 /*SC_DRAGMOVE*/, 0);
    return true;
}
 
void QWindowsWindow::setFrameStrutEventsEnabled(bool enabled)
{
    if (enabled) {
        setFlag(FrameStrutEventsEnabled);
    } else {
        clearFlag(FrameStrutEventsEnabled);
    }
}
 
void QWindowsWindow::getSizeHints(MINMAXINFO *mmi) const
{
    QWindowsGeometryHint::applyToMinMaxInfo(window(), fullFrameMargins(), mmi);
    qCDebug(lcQpaWindow) << __FUNCTION__ << window() << *mmi;
}
 
bool QWindowsWindow::handleNonClientHitTest(const QPoint &globalPos, LRESULT *result) const
{
    // QTBUG-32663, suppress resize cursor for fixed size windows.
    const QWindow *w = window();
    if (!w->isTopLevel() // Task 105852, minimized windows need to respond to user input.
        || (m_windowState != Qt::WindowNoState)
        || !isActive()
        || (m_data.flags & Qt::FramelessWindowHint)) {
        return false;
    }
    const QSize minimumSize = w->minimumSize();
    if (minimumSize.isEmpty())
        return false;
    const QSize maximumSize = w->maximumSize();
    const bool fixedWidth = minimumSize.width() == maximumSize.width();
    const bool fixedHeight = minimumSize.height() == maximumSize.height();
    if (!fixedWidth && !fixedHeight)
        return false;
    const QPoint localPos = w->mapFromGlobal(QHighDpi::fromNativePixels(globalPos, w));
    const QSize size = w->size();
    if (fixedHeight) {
        if (localPos.y() >= size.height()) {
            *result = HTBORDER; // Unspecified border, no resize cursor.
            return true;
        }
        if (localPos.y() < 0) {
            const int topResizeBarPos = invisibleMargins(m_data.hwnd).left() - frameMargins().top();
            if (localPos.y() < topResizeBarPos) {
                *result = HTCAPTION; // Extend caption over top resize bar, let's user move the window.
                return true;
            }
        }
    }
    if (fixedWidth && (localPos.x() < 0 || localPos.x() >= size.width())) {
        *result = HTBORDER; // Unspecified border, no resize cursor.
        return true;
    }
    return false;
}
 
#ifndef QT_NO_CURSOR
// Return the default cursor (Arrow) from QWindowsCursor's cache.
static inline CursorHandlePtr defaultCursor(const QWindow *w)
{
    if (QScreen *screen = w->screen())
        if (const QPlatformScreen *platformScreen = screen->handle())
            if (QPlatformCursor *cursor = platformScreen->cursor())
                return static_cast<QWindowsCursor *>(cursor)->standardWindowCursor(Qt::ArrowCursor);
    return CursorHandlePtr(new CursorHandle(QWindowsCursor::createCursorFromShape(Qt::ArrowCursor)));
}
 
// Check whether to apply a new cursor. Either the window in question is
// currently under mouse, or it is the parent of the window under mouse and
// there is no other window with an explicitly set cursor in-between.
static inline bool applyNewCursor(const QWindow *w)
{
    const QWindow *underMouse = QWindowsContext::instance()->windowUnderMouse();
    if (underMouse == w)
        return true;
    for (const QWindow *p = underMouse; p ; p = p->parent()) {
        if (p == w)
            return true;
        const QWindowsWindow *platformWindow = QWindowsWindow::windowsWindowOf(p);
        if (platformWindow && !platformWindow->cursor()->isNull())
            return false;
    }
    return false;
}
#endif // !QT_NO_CURSOR
 
void QWindowsWindow::applyCursor()
{
    if (QWindowsCursor::hasOverrideCursor()) {
        if (isTopLevel())
            QWindowsCursor::enforceOverrideCursor();
        return;
    }
#ifndef QT_NO_CURSOR
    if (m_cursor->isNull()) { // Recurse up to parent with non-null cursor. Set default for toplevel.
        if (const QWindow *p = window()->parent()) {
            if (QWindowsWindow *platformWindow = QWindowsWindow::windowsWindowOf(p))
                platformWindow->applyCursor();
        } else {
            SetCursor(defaultCursor(window())->handle());
        }
    } else {
        SetCursor(m_cursor->handle());
    }
#endif
}
 
void QWindowsWindow::setCursor(const CursorHandlePtr &c)
{
#ifndef QT_NO_CURSOR
    bool changed = c->handle() != m_cursor->handle();
    // QTBUG-98856: Cursors can get out of sync after restoring override
    // cursors on native windows. Force an update.
    if (testFlag(RestoreOverrideCursor)) {
        clearFlag(RestoreOverrideCursor);
        changed = true;
    }
    if (changed) {
        const bool apply = applyNewCursor(window());
        qCDebug(lcQpaWindow) << window() << __FUNCTION__
            << c->handle() << " doApply=" << apply;
        m_cursor = c;
        if (apply)
            applyCursor();
    }
#endif
}
 
void QWindowsWindow::setAlertState(bool enabled)
{
    if (isAlertState() == enabled)
        return;
    if (enabled) {
        alertWindow(0);
        setFlag(AlertState);
    } else {
        stopAlertWindow();
        clearFlag(AlertState);
    }
}
 
void QWindowsWindow::alertWindow(int durationMs)
{
    UINT timeOutMs = GetCaretBlinkTime();
    if (!timeOutMs || timeOutMs == INFINITE)
        timeOutMs = 250;
 
    FLASHWINFO info;
    info.cbSize = sizeof(info);
    info.hwnd = m_data.hwnd;
    info.dwFlags = FLASHW_TRAY;
    info.dwTimeout = timeOutMs;
    info.uCount = durationMs == 0 ? 10 : UINT(durationMs) / timeOutMs;
    FlashWindowEx(&info);
}
 
void QWindowsWindow::stopAlertWindow()
{
    FLASHWINFO info;
    info.cbSize = sizeof(info);
    info.hwnd = m_data.hwnd;
    info.dwFlags = FLASHW_STOP;
    info.dwTimeout = 0;
    info.uCount = 0;
    FlashWindowEx(&info);
}
 
bool QWindowsWindow::isEnabled() const
{
    return (style() & WS_DISABLED) == 0;
}
 
void QWindowsWindow::setEnabled(bool enabled)
{
    const unsigned oldStyle = style();
    unsigned newStyle = oldStyle;
    if (enabled) {
        newStyle &= ~WS_DISABLED;
    } else {
        newStyle |= WS_DISABLED;
    }
    if (newStyle != oldStyle)
        setStyle(newStyle);
}
 
static HICON createHIcon(const QIcon &icon, int xSize, int ySize)
{
    if (!icon.isNull()) {
        // QTBUG-90363, request DPR=1 for the title bar.
        const QPixmap pm = icon.pixmap(icon.actualSize(QSize(xSize, ySize)), 1);
        if (!pm.isNull())
            return qt_pixmapToWinHICON(pm);
    }
    return nullptr;
}
 
void QWindowsWindow::setWindowIcon(const QIcon &icon)
{
    if (m_data.hwnd) {
        destroyIcon();
 
        m_iconSmall = createHIcon(icon, GetSystemMetrics(SM_CXSMICON), GetSystemMetrics(SM_CYSMICON));
        m_iconBig = createHIcon(icon, GetSystemMetrics(SM_CXICON), GetSystemMetrics(SM_CYICON));
 
        if (m_iconBig) {
            SendMessage(m_data.hwnd, WM_SETICON, 0 /* ICON_SMALL */, LPARAM(m_iconSmall));
            SendMessage(m_data.hwnd, WM_SETICON, 1 /* ICON_BIG */, LPARAM(m_iconBig));
        } else {
            SendMessage(m_data.hwnd, WM_SETICON, 0 /* ICON_SMALL */, LPARAM(m_iconSmall));
            SendMessage(m_data.hwnd, WM_SETICON, 1 /* ICON_BIG */, LPARAM(m_iconSmall));
        }
    }
}
 
bool QWindowsWindow::isTopLevel() const
{
    return window()->isTopLevel() && !m_data.embedded;
}
 
enum : WORD {
    DwmwaUseImmersiveDarkMode = 20,
    DwmwaUseImmersiveDarkModeBefore20h1 = 19
};
 
bool QWindowsWindow::setDarkBorderToWindow(HWND hwnd, bool d)
{
    const BOOL darkBorder = d ? TRUE : FALSE;
    const bool ok =
        SUCCEEDED(DwmSetWindowAttribute(hwnd, DwmwaUseImmersiveDarkMode, &darkBorder, sizeof(darkBorder)))
        || SUCCEEDED(DwmSetWindowAttribute(hwnd, DwmwaUseImmersiveDarkModeBefore20h1, &darkBorder, sizeof(darkBorder)));
    if (!ok)
        qCWarning(lcQpaWindow, "%s: Unable to set %s window border.", __FUNCTION__, d ? "dark" : "light");
    return ok;
}
 
void QWindowsWindow::setDarkBorder(bool d)
{
    // respect explicit opt-out and incompatible palettes or styles
    d = d && shouldApplyDarkFrame(window());
 
    setDarkBorderToWindow(m_data.hwnd, d);
}
 
QWindowsMenuBar *QWindowsWindow::menuBar() const
{
    return m_menuBar.data();
}
 
void QWindowsWindow::setMenuBar(QWindowsMenuBar *mb)
{
    m_menuBar = mb;
}
 
QMargins QWindowsWindow::customMargins() const
{
    if (m_data.flags & Qt::FramelessWindowHint)
        return {};
    return m_data.customMargins;
}
 
void QWindowsWindow::setCustomMargins(const QMargins &newCustomMargins)
{
    if (m_data.flags & Qt::FramelessWindowHint) {
        qCWarning(lcQpaWindow) << "You should not set custom margins for a frameless window.";
        return;
    }
    if (newCustomMargins != m_data.customMargins) {
        const QMargins oldCustomMargins = m_data.customMargins;
        m_data.customMargins = newCustomMargins;
         // Re-trigger WM_NCALCSIZE with wParam=1 by passing SWP_FRAMECHANGED
        const QRect currentFrameGeometry = frameGeometry_sys();
        const QPoint topLeft = currentFrameGeometry.topLeft();
        QRect newFrame = currentFrameGeometry.marginsRemoved(oldCustomMargins) + m_data.customMargins;
        newFrame.moveTo(topLeft);
        qCDebug(lcQpaWindow) << __FUNCTION__ << oldCustomMargins << "->" << newCustomMargins
            << currentFrameGeometry << "->" << newFrame;
        SetWindowPos(m_data.hwnd, nullptr, newFrame.x(), newFrame.y(), newFrame.width(), newFrame.height(), SWP_NOZORDER | SWP_FRAMECHANGED | SWP_NOACTIVATE);
    }
}
 
void *QWindowsWindow::surface(void *nativeConfig, int *err)
{
#if QT_CONFIG(vulkan)
    Q_UNUSED(nativeConfig);
    Q_UNUSED(err);
    if (window()->surfaceType() == QSurface::VulkanSurface) {
        if (!m_vkSurface) {
            QVulkanInstance *inst = window()->vulkanInstance();
            if (inst)
                m_vkSurface = static_cast<QWindowsVulkanInstance *>(inst->handle())->createSurface(handle());
            else
                qWarning("Attempted to create Vulkan surface without an instance; was QWindow::setVulkanInstance() called?");
        }
        // Different semantics for VkSurfaces: the return value is the address,
        // not the value, given that this is a 64-bit handle even on x86.
        return &m_vkSurface;
    }
#elif defined(QT_NO_OPENGL)
    Q_UNUSED(err);
    Q_UNUSED(nativeConfig);
    return nullptr;
#endif
#ifndef QT_NO_OPENGL
    if (!m_surface) {
        if (QWindowsStaticOpenGLContext *staticOpenGLContext = QWindowsIntegration::staticOpenGLContext())
            m_surface = staticOpenGLContext->createWindowSurface(m_data.hwnd, nativeConfig, err);
    }
 
    return m_surface;
#else
    return nullptr;
#endif
}
 
void QWindowsWindow::invalidateSurface()
{
#if QT_CONFIG(vulkan)
    if (m_vkSurface) {
        QVulkanInstance *inst = window()->vulkanInstance();
        if (inst)
            static_cast<QWindowsVulkanInstance *>(inst->handle())->destroySurface(m_vkSurface);
        m_vkSurface = VK_NULL_HANDLE;
    }
#endif
#ifndef QT_NO_OPENGL
    if (m_surface) {
        if (QWindowsStaticOpenGLContext *staticOpenGLContext = QWindowsIntegration::staticOpenGLContext())
            staticOpenGLContext->destroyWindowSurface(m_surface);
        m_surface = nullptr;
    }
#endif // QT_NO_OPENGL
}
 
void QWindowsWindow::registerTouchWindow()
{
    if ((QWindowsContext::instance()->systemInfo() & QWindowsContext::SI_SupportsTouch) == 0)
        return;
 
    // Initially register or re-register to change the flags
    const auto touchTypes = QWindowsIntegration::instance()->touchWindowTouchType();
    if (testFlag(TouchRegistered)) {
        const auto currentTouchTypes = touchWindowTouchTypes_sys();
        if (currentTouchTypes.has_value() && currentTouchTypes.value() == touchTypes)
            return;
    }
 
    ULONG touchFlags = 0;
    if (touchTypes.testFlag(TouchWindowTouchType::FineTouch))
        touchFlags |= TWF_FINETOUCH;
    if (touchTypes.testFlag(TouchWindowTouchType::WantPalmTouch))
        touchFlags |= TWF_WANTPALM;
    if (RegisterTouchWindow(m_data.hwnd, touchFlags))
        setFlag(TouchRegistered);
    else
        qErrnoWarning("RegisterTouchWindow() failed for window '%s'.", qPrintable(window()->objectName()));
}
 
void QWindowsWindow::setHasBorderInFullScreenStatic(QWindow *window, bool border)
{
    if (QPlatformWindow *handle = window->handle())
        static_cast<QWindowsWindow *>(handle)->setHasBorderInFullScreen(border);
    else
        window->setProperty(hasBorderInFullScreenProperty, QVariant(border));
}
 
void QWindowsWindow::setHasBorderInFullScreenDefault(bool border)
{
    m_borderInFullScreenDefault = border;
}
 
bool QWindowsWindow::hasBorderInFullScreen() const
{
    return testFlag(HasBorderInFullScreen);
}
 
void QWindowsWindow::setHasBorderInFullScreen(bool border)
{
    if (hasBorderInFullScreen() == border)
        return;
    if (border)
        setFlag(HasBorderInFullScreen);
    else
        clearFlag(HasBorderInFullScreen);
    // Directly apply the flag in case we are fullscreen.
    if (m_windowState == Qt::WindowFullScreen) {
        LONG_PTR style = GetWindowLongPtr(handle(), GWL_STYLE);
        if (border)
            style |= WS_BORDER;
        else
            style &= ~WS_BORDER;
        SetWindowLongPtr(handle(), GWL_STYLE, style);
    }
}
 
QString QWindowsWindow::formatWindowTitle(const QString &title)
{
    return QPlatformWindow::formatWindowTitle(title, QStringLiteral(" - "));
}
 
QT_END_NAMESPACE