qwasmwindow.h

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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
#ifndef QWASMWINDOW_H
#define QWASMWINDOW_H
 
#include "qwasmintegration.h"
#include "qwasmbackingstore.h"
#include "qwasmscreen.h"
#include "qwasmcompositor.h"
#include "qwasmwindownonclientarea.h"
#include "qwasmwindowstack.h"
#include "qwasmwindowtreenode.h"
#include "qwasmevent.h"
 
#include <QtCore/private/qstdweb_p.h>
#include <qpa/qwindowsysteminterface.h>
#include <qpa/qplatformwindow.h>
#include <qpa/qplatformwindow_p.h>
 
#include <emscripten/val.h>
#include <emscripten/html5.h>
 
#include <memory>
 
QT_BEGIN_NAMESPACE
 
namespace qstdweb {
class EventCallback;
}
 
struct KeyEvent;
struct PointerEvent;
struct WheelEvent;
 
Q_DECLARE_LOGGING_CATEGORY(qLcQpaWasmInputContext)
 
class QWasmWindow final : public QPlatformWindow,
                          public QWasmWindowTreeNode<>,
                          public QNativeInterface::Private::QWasmWindow
{
public:
    QWasmWindow(QWindow *w, QWasmCompositor *compositor,
                QWasmBackingStore *backingStore, WId nativeHandle);
    ~QWasmWindow() final;
 
    static QWasmWindow *fromWindow(const QWindow *window);
    QWasmWindow *transientParent() const;
    Qt::WindowFlags windowFlags() const;
    bool isModal() const;
    QSurfaceFormat format() const override;
 
    void registerEventHandlers();
 
    void paint();
    void setZOrder(int order);
    void setWindowCursor(QByteArray cssCursorName);
    void onActivationChanged(bool active);
    bool isVisible() const;
 
    void onNonClientAreaInteraction();
    void onRestoreClicked();
    void onMaximizeClicked();
    void onToggleMaximized();
    void onCloseClicked();
    bool onNonClientEvent(const PointerEvent &event);
 
    // QPlatformWindow:
    void initialize() override;
    void setGeometry(const QRect &) override;
    void setVisible(bool visible) override;
    QMargins frameMargins() const override;
    WId winId() const override;
    void propagateSizeHints() override;
    void setOpacity(qreal level) override;
    void raise() override;
    void lower() override;
    QRect normalGeometry() const override;
    qreal devicePixelRatio() const override;
    void requestUpdate() override;
    void requestActivateWindow() override;
    void setWindowFlags(Qt::WindowFlags flags) override;
    void setWindowState(Qt::WindowStates state) override;
    void setWindowTitle(const QString &title) override;
    void setWindowIcon(const QIcon &icon) override;
    bool setKeyboardGrabEnabled(bool) override { return false; }
    bool setMouseGrabEnabled(bool grab) final;
    bool windowEvent(QEvent *event) final;
    void setMask(const QRegion &region) final;
    void setParent(const QPlatformWindow *window) final;
    void focus();
    void onAccessibilityEnable();
 
    QWasmScreen *platformScreen() const;
    void setBackingStore(QWasmBackingStore *store) { m_backingStore = store; }
    QWasmBackingStore *backingStore() const { return m_backingStore; }
 
    std::string canvasSelector() const;
 
    emscripten::val context2d() const { return m_context2d; }
    emscripten::val a11yContainer() const { return m_a11yContainer; }
    emscripten::val inputHandlerElement() const { return m_window; }
    emscripten::val inputElement() const { return m_inputElement; }
 
    // QNativeInterface::Private::QWasmWindow
    emscripten::val document() const override { return m_document; }
    emscripten::val clientArea() const override { return m_decoratedWindow; }
 
    // QWasmWindowTreeNode:
    emscripten::val containerElement() final;
    QWasmWindowTreeNode *parentNode() final;
 
public slots:
    void onTransientParentChanged(QWindow *newTransientParent);
    void onModalityChanged();
 
private:
    friend class QWasmScreen;
    static constexpr auto defaultWindowSize = 160;
 
    QMetaObject::Connection m_transientWindowChangedConnection;
    QMetaObject::Connection m_modalityChangedConnection;
 
    // QWasmWindowTreeNode:
    QWasmWindow *asWasmWindow() final;
    void onParentChanged(QWasmWindowTreeNode *previous, QWasmWindowTreeNode *current,
                         QWasmWindowStack<>::PositionPreference positionPreference) final;
 
    void shutdown();
    void invalidate();
    bool hasFrame() const;
    bool hasTitleBar() const;
    bool hasBorder() const;
    bool hasShadow() const;
    bool hasMaximizeButton() const;
    void applyWindowState();
    void commitParent(QWasmWindowTreeNode *parent);
 
    void handleKeyEvent(const KeyEvent &event);
    bool processKey(const KeyEvent &event);
    void handleKeyForInputContextEvent(const KeyEvent &event);
    bool processKeyForInputContext(const KeyEvent &event);
    void handleInputEvent(emscripten::val event);
    void handleCompositionStartEvent(emscripten::val event);
    void handleCompositionUpdateEvent(emscripten::val event);
    void handleCompositionEndEvent(emscripten::val event);
    void handleBeforeInputEvent(emscripten::val event);
 
    void handlePointerEnterLeaveEvent(const PointerEvent &event);
    bool processPointerEnterLeave(const PointerEvent &event);
    void releasePointerGrab(const MouseEvent &event);
    void processPointer(const PointerEvent &event);
    bool deliverPointerEvent(const PointerEvent &event);
    void handleWheelEvent(const emscripten::val &event);
    bool processWheel(const WheelEvent &event);
    Qt::WindowFlags fixTopLevelWindowFlags(Qt::WindowFlags) const;
    bool shouldBeAboveTransientParentFlags(Qt::WindowFlags flags) const;
    QWasmWindowStack<>::PositionPreference positionPreferenceFromWindowFlags(Qt::WindowFlags) const;
 
    QWasmCompositor *m_compositor = nullptr;
    QWasmBackingStore *m_backingStore = nullptr;
    QRect m_normalGeometry {0, 0, 0 ,0};
 
    emscripten::val m_document;
    emscripten::val m_decoratedWindow;
    emscripten::val m_window;
    emscripten::val m_a11yContainer;
    emscripten::val m_canvas;
    emscripten::val m_focusHelper;
    emscripten::val m_inputElement;
 
    emscripten::val m_context2d = emscripten::val::undefined();
 
    std::unique_ptr<NonClientArea> m_nonClientArea;
 
    QWasmWindowTreeNode *m_commitedParent = nullptr;
 
    QWasmEventHandler m_keyDownCallback;
    QWasmEventHandler m_keyUpCallback;
    QWasmEventHandler m_keyDownCallbackForInputContext;
    QWasmEventHandler m_keyUpCallbackForInputContext;
    QWasmEventHandler m_inputCallback;
    QWasmEventHandler m_compositionStartCallback;
    QWasmEventHandler m_compositionUpdateCallback;
    QWasmEventHandler m_compositionEndCallback;
    QWasmEventHandler m_beforeInputCallback;
 
    QWasmEventHandler m_pointerDownCallback;
    QWasmEventHandler m_pointerMoveCallback;
    QWasmEventHandler m_pointerUpCallback;
    QWasmEventHandler m_pointerCancelCallback;
    QWasmEventHandler m_pointerLeaveCallback;
    QWasmEventHandler m_pointerEnterCallback;
 
    QWasmEventHandler m_dragOverCallback;
    QWasmEventHandler m_dragStartCallback;
    QWasmEventHandler m_dragEndCallback;
    QWasmEventHandler m_dropCallback;
    QWasmEventHandler m_dragEnterCallback;
    QWasmEventHandler m_dragLeaveCallback;
 
    QWasmEventHandler m_wheelEventCallback;
 
    QMap<int, QWindowSystemInterface::TouchPoint> m_pointerIdToTouchPoints;
 
    QWasmEventHandler m_cutCallback;
    QWasmEventHandler m_copyCallback;
    QWasmEventHandler m_pasteCallback;
 
    Qt::WindowStates m_state = Qt::WindowNoState;
    Qt::WindowStates m_previousWindowState = Qt::WindowNoState;
 
    Qt::WindowFlags m_flags = Qt::Widget;
 
    QPoint m_lastPointerMovePoint;
 
    std::optional<int> m_capturedPointerId = std::nullopt;
    WId m_winId = 0;
    bool m_wantCapture = false;
    bool m_hasTitle = false;
    bool m_needsCompositor = false;
    long m_requestAnimationFrameId = -1;
    friend class QWasmCompositor;
    friend class QWasmEventTranslator;
    bool windowIsPopupType(Qt::WindowFlags flags) const;
};
 
QT_END_NAMESPACE
#endif // QWASMWINDOW_H