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// Copyright (C) 2018 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#ifndef QWASMCOMPOSITOR_H
#define QWASMCOMPOSITOR_H
#include <QtGui/qregion.h>
#include <qpa/qplatformwindow.h>
#include <QtOpenGL/qopengltextureblitter.h>
#include <QtGui/qpalette.h>
#include <QtGui/qpainter.h>
#include <QtGui/qinputdevice.h>
#include <QPointer>
#include <QPointingDevice>
#include <emscripten/html5.h>
#include <emscripten/emscripten.h>
#include <emscripten/bind.h>
QT_BEGIN_NAMESPACE
class QWasmWindow;
class QWasmScreen;
class QOpenGLContext;
class QOpenGLTexture;
class QWasmEventTranslator;
class QWasmCompositedWindow
{
public:
QWasmCompositedWindow();
QWasmWindow *window;
QWasmWindow *parentWindow;
QRegion damage;
bool flushPending;
bool visible;
QList<QWasmWindow *> childWindows;
};
class QWasmCompositor : public QObject
{
Q_OBJECT
public:
QWasmCompositor(QWasmScreen *screen);
~QWasmCompositor();
void initEventHandlers();
void deregisterEventHandlers();
void destroy();
enum QWasmSubControl {
SC_None = 0x00000000,
SC_TitleBarSysMenu = 0x00000001,
SC_TitleBarMinButton = 0x00000002,
SC_TitleBarMaxButton = 0x00000004,
SC_TitleBarCloseButton = 0x00000008,
SC_TitleBarNormalButton = 0x00000010,
SC_TitleBarLabel = 0x00000100
};
Q_DECLARE_FLAGS(SubControls, QWasmSubControl)
enum QWasmStateFlag {
State_None = 0x00000000,
State_Enabled = 0x00000001,
State_Raised = 0x00000002,
State_Sunken = 0x00000004
};
Q_DECLARE_FLAGS(StateFlags, QWasmStateFlag)
enum ResizeMode {
ResizeNone,
ResizeTopLeft,
ResizeTop,
ResizeTopRight,
ResizeRight,
ResizeBottomRight,
ResizeBottom,
ResizeBottomLeft,
ResizeLeft
};
struct QWasmTitleBarOptions {
QRect rect;
Qt::WindowFlags flags;
int state;
QPalette palette;
QString titleBarOptionsString;
QWasmCompositor::SubControls subControls;
QIcon windowIcon;
};
struct QWasmFrameOptions {
QRect rect;
int lineWidth;
QPalette palette;
};
void setEnabled(bool enabled);
void addWindow(QWasmWindow *window, QWasmWindow *parentWindow = nullptr);
void removeWindow(QWasmWindow *window);
void setVisible(QWasmWindow *window, bool visible);
void raise(QWasmWindow *window);
void lower(QWasmWindow *window);
void setParent(QWasmWindow *window, QWasmWindow *parent);
int windowCount() const;
QWindow *windowAt(QPoint globalPoint, int padding = 0) const;
QWindow *keyWindow() const;
static QWasmTitleBarOptions makeTitleBarOptions(const QWasmWindow *window);
static QRect titlebarRect(QWasmTitleBarOptions tb, QWasmCompositor::SubControls subcontrol);
QWasmScreen *screen();
QOpenGLContext *context();
enum UpdateRequestDeliveryType { ExposeEventDelivery, UpdateRequestDelivery };
void requestUpdateAllWindows();
void requestUpdateWindow(QWasmWindow *window, UpdateRequestDeliveryType updateType = ExposeEventDelivery);
void requestUpdate();
void deliverUpdateRequests();
void deliverUpdateRequest(QWasmWindow *window, UpdateRequestDeliveryType updateType);
void handleBackingStoreFlush();
bool processMouse(int eventType, const EmscriptenMouseEvent *mouseEvent);
bool processKeyboard(int eventType, const EmscriptenKeyboardEvent *keyEvent);
bool processWheel(int eventType, const EmscriptenWheelEvent *wheelEvent);
int handleTouch(int eventType, const EmscriptenTouchEvent *touchEvent);
void resizeWindow(QWindow *window, QWasmCompositor::ResizeMode mode, QRect startRect, QPoint amount);
bool processMouseEnter(const EmscriptenMouseEvent *mouseEvent);
bool processMouseLeave();
void enterWindow(QWindow* window, const QPoint &localPoint, const QPoint &globalPoint);
void leaveWindow(QWindow* window);
private slots:
void frame();
private:
void notifyTopWindowChanged(QWasmWindow *window);
void drawWindow(QOpenGLTextureBlitter *blitter, QWasmScreen *screen, QWasmWindow *window);
void drawWindowContent(QOpenGLTextureBlitter *blitter, QWasmScreen *screen, QWasmWindow *window);
void blit(QOpenGLTextureBlitter *blitter, QWasmScreen *screen, const QOpenGLTexture *texture, QRect targetGeometry);
void drawWindowDecorations(QOpenGLTextureBlitter *blitter, QWasmScreen *screen, QWasmWindow *window);
void drwPanelButton();
QScopedPointer<QOpenGLContext> m_context;
QScopedPointer<QOpenGLTextureBlitter> m_blitter;
QHash<QWasmWindow *, QWasmCompositedWindow> m_compositedWindows;
QList<QWasmWindow *> m_windowStack;
QRegion m_globalDamage; // damage caused by expose, window close, etc.
bool m_needComposit;
bool m_inFlush;
bool m_inResize;
bool m_isEnabled;
QSize m_targetSize;
qreal m_targetDevicePixelRatio;
QMap<QWasmWindow *, UpdateRequestDeliveryType> m_requestUpdateWindows;
bool m_requestUpdateAllWindows = false;
int m_requestAnimationFrameId = -1;
bool m_inDeliverUpdateRequest = false;
QPointer<QWindow> draggedWindow;
QPointer<QWindow> pressedWindow;
QPointer<QWindow> lastWindow;
Qt::MouseButtons pressedButtons;
QWasmCompositor::ResizeMode resizeMode;
QPoint resizePoint;
QRect resizeStartRect;
QPointingDevice *touchDevice;
QMap <int, QPointF> pressedTouchIds;
QCursor overriddenCursor;
bool isCursorOverridden = false;
static QPalette makeWindowPalette();
void drawFrameWindow(QWasmFrameOptions options, QPainter *painter);
void drawTitlebarWindow(QWasmTitleBarOptions options, QPainter *painter);
void drawShadePanel(QWasmTitleBarOptions options, QPainter *painter);
void drawItemPixmap(QPainter *painter, const QRect &rect,
int alignment, const QPixmap &pixmap) const;
static int keyboard_cb(int eventType, const EmscriptenKeyboardEvent *keyEvent, void *userData);
static int mouse_cb(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
static int focus_cb(int eventType, const EmscriptenFocusEvent *focusEvent, void *userData);
static int wheel_cb(int eventType, const EmscriptenWheelEvent *wheelEvent, void *userData);
static int touchCallback(int eventType, const EmscriptenTouchEvent *ev, void *userData);
QWasmEventTranslator *eventTranslator;
bool mouseInCanvas;
QPointer<QWindow> windowUnderMouse;
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QWasmCompositor::SubControls)
QT_END_NAMESPACE
#endif
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