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// Copyright (C) 2023 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 QQUICKLAYOUTITEMPROXY_P_H
#define QQUICKLAYOUTITEMPROXY_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 <private/qquickitem_p.h>
#include <private/qquickrectangle_p.h>
class QQuickLayoutItemProxyAttachedData;
class QQuickLayoutItemProxyPrivate;
class QQuickLayoutItemProxy : public QQuickItem
{
Q_OBJECT
Q_PROPERTY(QQuickItem *target READ target WRITE setTarget NOTIFY targetChanged)
QML_NAMED_ELEMENT(LayoutItemProxy)
QML_ADDED_IN_VERSION(6, 6)
public:
QQuickLayoutItemProxy(QQuickItem *parent = nullptr);
~QQuickLayoutItemProxy() override;
void geometryChange(const QRectF &newGeom, const QRectF &oldGeom) override;
void itemChange(ItemChange c, const ItemChangeData &d) override;
QQuickItem *target() const;
void setTarget(QQuickItem *newTarget);
Q_INVOKABLE QQuickItem *effectiveTarget() const;
void clearTarget();
void maybeTakeControl();
public slots:
void updatePos();
private slots:
// We define some slots to react to changes to the Layout attached properties.
// They are all named following the same scheme, which allows us to use a macro.
#define propertyForwarding(Property) \
void target##Property##Changed(); \
void proxy##Property##Changed();
propertyForwarding(MinimumWidth)
propertyForwarding(MinimumHeight)
propertyForwarding(PreferredWidth)
propertyForwarding(PreferredHeight)
propertyForwarding(MaximumWidth)
propertyForwarding(MaximumHeight)
propertyForwarding(FillWidth)
propertyForwarding(FillHeight)
propertyForwarding(Alignment)
propertyForwarding(HorizontalStretchFactor)
propertyForwarding(VerticalStretchFactor)
propertyForwarding(Margins)
propertyForwarding(LeftMargin)
propertyForwarding(TopMargin)
propertyForwarding(RightMargin)
propertyForwarding(BottomMargin)
#undef propertyForwarding
signals:
void targetChanged();
private:
Q_DECLARE_PRIVATE(QQuickLayoutItemProxy)
};
class QQuickLayoutItemProxyPrivate : public QQuickItemPrivate
{
Q_DECLARE_PUBLIC(QQuickLayoutItemProxy)
public:
QQuickLayoutItemProxyPrivate();
// the target of the LayoutItem
QQuickItem *target = nullptr;
// These values are required to know why the Layout property of the proxy changed
// If it changed because the target changed we should keep the connection valid
// If a Layout property change is not invoked by the target, it was set
// explicitly by the application developer and we should disconnect the connection
// between target and proxy for this property.
unsigned m_expectProxyMinimumWidthChange : 1;
unsigned m_expectProxyMinimumHeightChange : 1;
unsigned m_expectProxyPreferredWidthChange : 1;
unsigned m_expectProxyPreferredHeightChange : 1;
unsigned m_expectProxyMaximumWidthChange : 1;
unsigned m_expectProxyMaximumHeightChange : 1;
unsigned m_expectProxyFillWidthChange : 1;
unsigned m_expectProxyFillHeightChange : 1;
unsigned m_expectProxyAlignmentChange : 1;
unsigned m_expectProxyHorizontalStretchFactorChange : 1;
unsigned m_expectProxyVerticalStretchFactorChange : 1;
unsigned m_expectProxyMarginsChange : 1;
unsigned m_expectProxyLeftMarginChange : 1;
unsigned m_expectProxyTopMarginChange : 1;
unsigned m_expectProxyRightMarginChange : 1;
unsigned m_expectProxyBottomMarginChange : 1;
friend class QQuickLayoutItemProxy;
};
class QQuickLayoutItemProxyAttachedData : public QObject
{
Q_OBJECT
QML_ANONYMOUS
Q_PROPERTY(bool proxyHasControl READ proxyHasControl NOTIFY controllingProxyChanged)
Q_PROPERTY(QQuickLayoutItemProxy* controllingProxy READ getControllingProxy NOTIFY controllingProxyChanged)
Q_PROPERTY(QQmlListProperty<QQuickLayoutItemProxy> proxies READ getProxies NOTIFY proxiesChanged)
public:
QQuickLayoutItemProxyAttachedData(QObject *parent);
~QQuickLayoutItemProxyAttachedData() override;
void registerProxy(QQuickLayoutItemProxy *proxy);
void releaseProxy(QQuickLayoutItemProxy *proxy);
bool takeControl(QQuickLayoutItemProxy *proxy);
void releaseControl(QQuickLayoutItemProxy *proxy);
QQuickLayoutItemProxy *getControllingProxy() const;
QQmlListProperty<QQuickLayoutItemProxy> getProxies();
bool proxyHasControl() const;
signals:
void controlTaken();
void controlReleased();
void controllingProxyChanged();
void proxiesChanged();
private:
QList<QQuickLayoutItemProxy*> proxies;
QQuickLayoutItemProxy* controllingProxy;
};
Q_DECLARE_METATYPE(QQuickLayoutItemProxyAttachedData*);
#endif // QQUICKLAYOUTITEMPROXY_P_H
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