qwindowscontext.h

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
 
#ifndef QWINDOWSCONTEXT_H
#define QWINDOWSCONTEXT_H
 
#include "qtwindowsglobal.h"
#include <QtCore/qt_windows.h>
 
#include <QtCore/qscopedpointer.h>
#include <QtCore/qsharedpointer.h>
#include <QtCore/qloggingcategory.h>
 
#define STRICT_TYPED_ITEMIDS
#include <shlobj.h>
#include <shlwapi.h>
 
QT_BEGIN_NAMESPACE
 
Q_DECLARE_LOGGING_CATEGORY(lcQpaWindow)
Q_DECLARE_LOGGING_CATEGORY(lcQpaEvents)
Q_DECLARE_LOGGING_CATEGORY(lcQpaGl)
Q_DECLARE_LOGGING_CATEGORY(lcQpaMime)
Q_DECLARE_LOGGING_CATEGORY(lcQpaInputMethods)
Q_DECLARE_LOGGING_CATEGORY(lcQpaDialogs)
Q_DECLARE_LOGGING_CATEGORY(lcQpaMenus)
Q_DECLARE_LOGGING_CATEGORY(lcQpaTablet)
Q_DECLARE_LOGGING_CATEGORY(lcQpaAccessibility)
Q_DECLARE_LOGGING_CATEGORY(lcQpaUiAutomation)
Q_DECLARE_LOGGING_CATEGORY(lcQpaTrayIcon)
Q_DECLARE_LOGGING_CATEGORY(lcQpaScreen)
 
class QWindow;
class QPlatformScreen;
class QPlatformWindow;
class QPlatformKeyMapper;
class QWindowsMenuBar;
class QWindowsScreenManager;
class QWindowsTabletSupport;
class QWindowsWindow;
class QWindowsMimeRegistry;
struct QWindowCreationContext;
struct QWindowsContextPrivate;
class QPoint;
class QKeyEvent;
class QPointingDevice;
class QWindowsContext
{
    Q_DISABLE_COPY_MOVE(QWindowsContext)
public:
    using HandleBaseWindowHash = QHash<HWND, QWindowsWindow *>;
 
    enum SystemInfoFlags
    {
        SI_RTL_Extensions = 0x1,
        SI_SupportsTouch = 0x2,
        SI_SupportsPointer = 0x4,
    };
 
    // Verbose flag set by environment variable QT_QPA_VERBOSE
    static int verbose;
 
    explicit QWindowsContext();
    ~QWindowsContext();
 
    bool initTouch();
    bool initTouch(unsigned integrationOptions); // For calls from QWindowsIntegration::QWindowsIntegration() only.
    void registerTouchWindows();
    bool initTablet();
    bool initPointer(unsigned integrationOptions);
    bool disposeTablet();
 
    bool initPowerNotificationHandler();
 
    int defaultDPI() const;
 
    static QString classNamePrefix();
    QString registerWindowClass(const QWindow *w);
    QString registerWindowClass(QString cname, WNDPROC proc,
                                unsigned style = 0, HBRUSH brush = nullptr,
                                bool icon = false);
    HWND createDummyWindow(const QString &classNameIn,
                           const wchar_t *windowName,
                           WNDPROC wndProc = nullptr, DWORD style = WS_OVERLAPPED);
 
    HDC displayContext() const;
    int screenDepth() const;
 
    static QWindowsContext *instance();
 
    void addWindow(HWND, QWindowsWindow *w);
    void removeWindow(HWND);
 
    QWindowsWindow *findClosestPlatformWindow(HWND) const;
    QWindowsWindow *findPlatformWindow(HWND) const;
    QWindowsWindow *findPlatformWindow(const QWindowsMenuBar *mb) const;
    QWindow *findWindow(HWND) const;
    QWindowsWindow *findPlatformWindowAt(HWND parent, const QPoint &screenPoint,
                                             unsigned cwex_flags) const;
 
    static bool shouldHaveNonClientDpiScaling(const QWindow *window);
 
    QWindow *windowUnderMouse() const;
    void clearWindowUnderMouse();
 
    inline bool windowsProc(HWND hwnd, UINT message,
                            QtWindows::WindowsEventType et,
                            WPARAM wParam, LPARAM lParam, LRESULT *result,
                            QWindowsWindow **platformWindowPtr);
 
    QWindow *keyGrabber() const;
    void setKeyGrabber(QWindow *hwnd);
 
    QSharedPointer<QWindowCreationContext> setWindowCreationContext(const QSharedPointer<QWindowCreationContext> &ctx);
    QSharedPointer<QWindowCreationContext> windowCreationContext() const;
 
    static void setTabletAbsoluteRange(int a);
 
    static bool setProcessDpiAwareness(QtWindows::DpiAwareness dpiAwareness);
    static QtWindows::DpiAwareness processDpiAwareness();
    static QtWindows::DpiAwareness windowDpiAwareness(HWND hwnd);
 
    void setDetectAltGrModifier(bool a);
 
    // Returns a combination of SystemInfoFlags
    unsigned systemInfo() const;
 
    bool useRTLExtensions() const;
    QPlatformKeyMapper *keyMapper() const;
 
    HandleBaseWindowHash &windows();
 
    static bool isSessionLocked();
 
    QWindowsMimeRegistry &mimeConverter() const;
    QWindowsScreenManager &screenManager();
    QWindowsTabletSupport *tabletSupport() const;
 
    bool asyncExpose() const;
    void setAsyncExpose(bool value);
 
    static void forceNcCalcSize(HWND hwnd);
 
    static bool systemParametersInfo(unsigned action, unsigned param, void *out, unsigned dpi = 0);
    static bool systemParametersInfoForScreen(unsigned action, unsigned param, void *out,
                                              const QPlatformScreen *screen = nullptr);
    static bool systemParametersInfoForWindow(unsigned action, unsigned param, void *out,
                                              const QPlatformWindow *win = nullptr);
    static bool nonClientMetrics(NONCLIENTMETRICS *ncm, unsigned dpi = 0);
    static bool nonClientMetricsForScreen(NONCLIENTMETRICS *ncm,
                                          const QPlatformScreen *screen = nullptr);
    static bool nonClientMetricsForWindow(NONCLIENTMETRICS *ncm,
                                          const QPlatformWindow *win = nullptr);
 
    static DWORD readAdvancedExplorerSettings(const wchar_t *subKey, DWORD defaultValue);
 
    static bool filterNativeEvent(MSG *msg, LRESULT *result);
    static bool filterNativeEvent(QWindow *window, MSG *msg, LRESULT *result);
 
private:
    void handleFocusEvent(QtWindows::WindowsEventType et, QWindowsWindow *w);
#ifndef QT_NO_CONTEXTMENU
    bool handleContextMenuEvent(QWindow *window, const MSG &msg);
#endif
    void handleExitSizeMove(QWindow *window);
    void unregisterWindowClasses();
 
    QScopedPointer<QWindowsContextPrivate> d;
    static QWindowsContext *m_instance;
};
 
extern "C" LRESULT QT_WIN_CALLBACK qWindowsWndProc(HWND, UINT, WPARAM, LPARAM);
 
QT_END_NAMESPACE
 
#endif // QWINDOWSCONTEXT_H