qquickcanvas_p.h

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#ifndef QQUICKCANVAS_P_H
#define QQUICKCANVAS_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "qquickitem.h"
#include "qquickcanvas.h"
#include <private/qqmlguard_p.h>

#include <QtQuick/private/qsgcontext_p.h>
#include <private/qquickdrag_p.h>

#include <QtCore/qthread.h>
#include <QtCore/qmutex.h>
#include <QtCore/qwaitcondition.h>
#include <private/qwindow_p.h>
#include <private/qopengl_p.h>
#include <qopenglcontext.h>
#include <QtGui/qopenglframebufferobject.h>
#include <QtGui/qevent.h>
#include <QtGui/qinputpanel.h>

QT_BEGIN_NAMESPACE

//Make it easy to identify and customize the root item if needed

class QQuickWindowManager;

class QQuickRootItem : public QQuickItem
{
    Q_OBJECT
public:
    QQuickRootItem();
public Q_SLOTS:
    void setWidth(int w) {QQuickItem::setWidth(qreal(w));}
    void setHeight(int h) {QQuickItem::setHeight(qreal(h));}
};

class QQuickItemPrivate;
class QQuickCanvasPrivate;

class QTouchEvent;
class QQuickCanvasRenderLoop;
class QQuickCanvasIncubationController;

class Q_QUICK_EXPORT QQuickCanvasPrivate : public QWindowPrivate
{
public:
    Q_DECLARE_PUBLIC(QQuickCanvas)

    static inline QQuickCanvasPrivate *get(QQuickCanvas *c) { return c->d_func(); }

    QQuickCanvasPrivate();
    virtual ~QQuickCanvasPrivate();

    void init(QQuickCanvas *);
    void initRootItem();//Currently only used if items added in QML

    QQuickRootItem *rootItem;
    QSet<QQuickItem *> parentlessItems;
    QQmlListProperty<QObject> data();

    QQuickItem *activeFocusItem;
    QQuickItem *mouseGrabberItem;
    QQuickDragGrabber dragGrabber;
    int touchMouseId;
    ulong touchMousePressTimestamp;

    // Mouse positions are saved in widget coordinates
    QPointF lastMousePosition;
    void translateTouchToMouse(QTouchEvent *event);
    void translateTouchEvent(QTouchEvent *touchEvent);
    static void transformTouchPoints(QList<QTouchEvent::TouchPoint> &touchPoints, const QTransform &transform);
    bool deliverInitialMousePressEvent(QQuickItem *, QMouseEvent *);
    bool deliverMouseEvent(QMouseEvent *);
    bool sendFilteredMouseEvent(QQuickItem *, QQuickItem *, QEvent *);
    bool deliverWheelEvent(QQuickItem *, QWheelEvent *);
    bool deliverTouchPoints(QQuickItem *, QTouchEvent *, const QList<QTouchEvent::TouchPoint> &, QSet<int> *,
            QHash<QQuickItem *, QList<QTouchEvent::TouchPoint> > *);
    bool deliverTouchEvent(QTouchEvent *);
    bool deliverHoverEvent(QQuickItem *, const QPointF &scenePos, const QPointF &lastScenePos, Qt::KeyboardModifiers modifiers, bool &accepted);
    bool sendHoverEvent(QEvent::Type, QQuickItem *, const QPointF &scenePos, const QPointF &lastScenePos,
                        Qt::KeyboardModifiers modifiers, bool accepted);
    bool clearHover();
    void deliverDragEvent(QQuickDragGrabber *, QEvent *);
    bool deliverDragEvent(QQuickDragGrabber *, QQuickItem *, QDragMoveEvent *);

    QList<QQuickItem*> hoverItems;
    enum FocusOption {
        DontChangeFocusProperty = 0x01,
        DontChangeSubFocusItem  = 0x02
    };
    Q_DECLARE_FLAGS(FocusOptions, FocusOption)

    void setFocusInScope(QQuickItem *scope, QQuickItem *item, FocusOptions = 0);
    void clearFocusInScope(QQuickItem *scope, QQuickItem *item, FocusOptions = 0);
    static void notifyFocusChangesRecur(QQuickItem **item, int remaining);

    void updateFocusItemTransform();

    void dirtyItem(QQuickItem *);
    void cleanup(QSGNode *);

    void polishItems();
    void syncSceneGraph();
    void renderSceneGraph(const QSize &size);

    bool renderWithoutShowing;
    void setRenderWithoutShowing(bool enabled);

    QQuickItem::UpdatePaintNodeData updatePaintNodeData;

    QQuickItem *dirtyItemList;
    QList<QSGNode *> cleanupNodeList;

    QSet<QQuickItem *> itemsToPolish;

    void updateDirtyNodes();
    void cleanupNodes();
    void cleanupNodesOnShutdown();
    bool updateEffectiveOpacity(QQuickItem *);
    void updateEffectiveOpacityRoot(QQuickItem *, qreal);
    void updateDirtyNode(QQuickItem *);

    void fireFrameSwapped() { emit q_func()->frameSwapped(); }

    QSGEngine *engine;
    QSGContext *context;
    QSGRenderer *renderer;

    QQuickWindowManager *windowManager;

    QColor clearColor;

    uint clearBeforeRendering : 1;

    // Currently unused in the default implementation, as we're not stopping
    // rendering when obscured as we should...
    uint persistentGLContext : 1;
    uint persistentSceneGraph : 1;

    QOpenGLFramebufferObject *renderTarget;
    uint renderTargetId;
    QSize renderTargetSize;

    QHash<int, QQuickItem *> itemForTouchPointId;

    mutable QQuickCanvasIncubationController *incubationController;

private:
    static void cleanupNodesOnShutdown(QQuickItem *);
};


Q_DECLARE_OPERATORS_FOR_FLAGS(QQuickCanvasPrivate::FocusOptions)

QT_END_NAMESPACE

#endif // QQUICKCANVAS_P_H