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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of Qt Designer. This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//
#ifndef ZOOMWIDGET_H
#define ZOOMWIDGET_H
#include "shared_global_p.h"
#include <QtWidgets/qgraphicsview.h>
#include <QtWidgets/qgraphicsproxywidget.h>
#include <QtCore/qlist.h>
QT_BEGIN_NAMESPACE
class QGraphicsScene;
class QMenu;
class QAction;
class QActionGroup;
namespace qdesigner_internal {
// A checkable zoom menu action group. Operates in percent.
class QDESIGNER_SHARED_EXPORT ZoomMenu : public QObject {
Q_OBJECT
Q_DISABLE_COPY_MOVE(ZoomMenu)
public:
ZoomMenu(QObject *parent = nullptr);
void addActions(QMenu *m);
int zoom() const;
// Return a list of available zoom values.
static QList<int> zoomValues();
public slots:
void setZoom(int percent);
signals:
void zoomChanged(int);
private slots:
void slotZoomMenu(QAction *);
private:
static int zoomOf(const QAction *a);
QActionGroup *m_menuActions;
};
/* Zoom view: A QGraphicsView with a zoom menu */
class QDESIGNER_SHARED_EXPORT ZoomView : public QGraphicsView
{
Q_PROPERTY(int zoom READ zoom WRITE setZoom DESIGNABLE true SCRIPTABLE true)
Q_PROPERTY(bool zoomContextMenuEnabled READ isZoomContextMenuEnabled WRITE setZoomContextMenuEnabled DESIGNABLE true SCRIPTABLE true)
Q_OBJECT
Q_DISABLE_COPY_MOVE(ZoomView)
public:
ZoomView(QWidget *parent = nullptr);
/* Zoom in percent (for easily implementing menus) and qreal zoomFactor
* in sync */
int zoom() const; // in percent
qreal zoomFactor() const;
// Zoom Menu on QGraphicsView.
bool isZoomContextMenuEnabled() const;
void setZoomContextMenuEnabled(bool e);
QGraphicsScene &scene() { return *m_scene; }
const QGraphicsScene &scene() const { return *m_scene; }
// Helpers for menu
ZoomMenu *zoomMenu();
QPoint scrollPosition() const;
void setScrollPosition(const QPoint& pos);
void scrollToOrigin();
public slots:
void setZoom(int percent);
void showContextMenu(const QPoint &globalPos);
protected:
void contextMenuEvent(QContextMenuEvent *event) override;
// Overwrite for implementing additional behaviour when doing setZoom();
virtual void applyZoom();
private:
QGraphicsScene *m_scene;
int m_zoom = 100;
qreal m_zoomFactor = 1;
bool m_zoomContextMenuEnabled = false;
ZoomMenu *m_zoomMenu = nullptr;
};
/* The proxy widget used in ZoomWidget. It refuses to move away from 0,0,
* This behaviour is required for Windows only. */
class QDESIGNER_SHARED_EXPORT ZoomProxyWidget : public QGraphicsProxyWidget {
Q_DISABLE_COPY_MOVE(ZoomProxyWidget)
public:
explicit ZoomProxyWidget(QGraphicsItem *parent = nullptr, Qt::WindowFlags wFlags = {});
protected:
QVariant itemChange(GraphicsItemChange change, const QVariant &value) override;
};
/* Zoom widget: A QGraphicsView-based container for a widget that allows for
* zooming it. Communicates changes in size in the following ways:
* 1) Embedded widget wants to resize: Listen for its resize in event filter
* and resize
* 2) Zoom is changed: resize to fully display the embedded widget
* 3) Outer widget changes (by manually resizing the window:
* Pass the scaled change on to the embedded widget.
* Provides helper functions for a zoom context menu on the widget. */
class QDESIGNER_SHARED_EXPORT ZoomWidget : public ZoomView
{
Q_PROPERTY(bool widgetZoomContextMenuEnabled READ isWidgetZoomContextMenuEnabled WRITE setWidgetZoomContextMenuEnabled DESIGNABLE true SCRIPTABLE true)
Q_PROPERTY(bool itemAcceptDrops READ itemAcceptDrops WRITE setItemAcceptDrops DESIGNABLE true SCRIPTABLE true)
Q_OBJECT
Q_DISABLE_COPY_MOVE(ZoomWidget)
public:
ZoomWidget(QWidget *parent = nullptr);
void setWidget(QWidget *w, Qt::WindowFlags wFlags = {});
const QGraphicsProxyWidget *proxy() const { return m_proxy; }
QGraphicsProxyWidget *proxy() { return m_proxy; }
/* Enable the zoom Menu on the Widget (as opposed ZoomView's menu which
* is on the canvas). */
bool isWidgetZoomContextMenuEnabled() const;
void setWidgetZoomContextMenuEnabled(bool e);
void setItemAcceptDrops(bool);
bool itemAcceptDrops() const;
QSize minimumSizeHint() const override;
QSize sizeHint() const override;
bool zoomedEventFilter(QObject *watched, QEvent *event);
public slots:
// debug state
void dump() const;
protected:
void resizeEvent(QResizeEvent * event) override;
// Overwritten from ZoomView
void applyZoom() override;
// Overwrite to actually perform a resize. This is required if we are in a layout. Default does resize().
virtual void doResize(const QSize &s);
private:
// Factory function for QGraphicsProxyWidgets which can be overwritten. Default creates a ZoomProxyWidget
virtual QGraphicsProxyWidget *createProxyWidget(QGraphicsItem *parent = nullptr,
Qt::WindowFlags wFlags = {}) const;
QSize widgetSizeToViewSize(const QSize &s, bool *ptrToValid = nullptr) const;
void resizeToWidgetSize();
QSize viewPortMargin() const;
QSize widgetSize() const;
QSizeF widgetDecorationSizeF() const;
QGraphicsProxyWidget *m_proxy = nullptr;
bool m_viewResizeBlocked = false;
bool m_widgetResizeBlocked = false;
bool m_widgetZoomContextMenuEnabled = false;
};
} // namespace qdesigner_internal
QT_END_NAMESPACE
#endif
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