qquickitemchangelistener_p.h

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// Copyright (C) 2021 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 QQUICKITEMCHANGELISTENER_P_H
#define QQUICKITEMCHANGELISTENER_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 <QtQuick/private/qtquickglobal_p.h>
 
QT_BEGIN_NAMESPACE
 
class QRectF;
class QQuickItem;
class QQuickAnchorsPrivate;
 
class QQuickGeometryChange
{
public:
    enum Kind: int {
        Nothing = 0x00,
        X       = 0x01,
        Y       = 0x02,
        Width   = 0x04,
        Height  = 0x08,
 
        Size = Width | Height,
        All = X | Y | Size
    };
 
    QQuickGeometryChange(int change = Nothing)
        : kind(change)
    {}
 
    bool noChange() const { return kind == Nothing; }
    bool anyChange() const { return !noChange(); }
 
    bool xChange() const { return kind & X; }
    bool yChange() const { return kind & Y; }
    bool widthChange() const { return kind & Width; }
    bool heightChange() const { return kind & Height; }
 
    bool positionChange() const { return xChange() || yChange(); }
    bool sizeChange() const { return widthChange() || heightChange(); }
 
    bool horizontalChange() const { return xChange() || widthChange(); }
    bool verticalChange() const { return yChange() || heightChange(); }
 
    void setXChange(bool enabled) { set(X, enabled); }
    void setYChange(bool enabled) { set(Y, enabled); }
    void setWidthChange(bool enabled) { set(Width, enabled); }
    void setHeightChange(bool enabled) { set(Height, enabled); }
    void setSizeChange(bool enabled) { set(Size, enabled); }
    void setAllChanged(bool enabled) { set(All, enabled); }
    void setHorizontalChange(bool enabled) { set(X | Width, enabled); }
    void setVerticalChange(bool enabled) { set(Y | Height, enabled); }
 
    void set(int bits, bool enabled)
    {
        if (enabled) {
            kind |= bits;
        } else {
            kind &= ~bits;
        }
    }
 
    bool matches(QQuickGeometryChange other) const { return kind & other.kind; }
 
private:
    int kind;
};
 
#define QT_QUICK_NEW_GEOMETRY_CHANGED_HANDLING
 
class Q_QUICK_EXPORT QQuickItemChangeListener
{
public:
    virtual ~QQuickItemChangeListener();
 
    virtual void itemGeometryChanged(QQuickItem *, QQuickGeometryChange, const QRectF & /* oldGeometry */) {}
    virtual void itemSiblingOrderChanged(QQuickItem *) {}
    virtual void itemVisibilityChanged(QQuickItem *) {}
    virtual void itemEnabledChanged(QQuickItem *) {}
    virtual void itemOpacityChanged(QQuickItem *) {}
    virtual void itemDestroyed(QQuickItem *) {}
    virtual void itemChildAdded(QQuickItem *, QQuickItem * /* child */ ) {}
    virtual void itemChildRemoved(QQuickItem *, QQuickItem * /* child */ ) {}
    virtual void itemParentChanged(QQuickItem *, QQuickItem * /* parent */ ) {}
    virtual void itemRotationChanged(QQuickItem *) {}
    virtual void itemImplicitWidthChanged(QQuickItem *) {}
    virtual void itemImplicitHeightChanged(QQuickItem *) {}
    virtual void itemFocusChanged(QQuickItem *, Qt::FocusReason /* reason */) {}
 
    virtual QQuickAnchorsPrivate *anchorPrivate() { return nullptr; }
};
 
QT_END_NAMESPACE
 
#endif // QQUICKITEMCHANGELISTENER_P_H