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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt Designer of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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 <QtGui/QGraphicsView>
#include <QtGui/QGraphicsProxyWidget>
#include <QtCore/QList>
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(ZoomMenu)
public:
ZoomMenu(QObject *parent = 0);
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(ZoomView)
public:
ZoomView(QWidget *parent = 0);
/* 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);
// Overwrite for implementing additional behaviour when doing setZoom();
virtual void applyZoom();
private:
QGraphicsScene *m_scene;
int m_zoom;
qreal m_zoomFactor;
bool m_zoomContextMenuEnabled;
bool m_resizeBlocked;
ZoomMenu *m_zoomMenu;
};
/* 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(ZoomProxyWidget)
public:
explicit ZoomProxyWidget(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0);
protected:
virtual QVariant itemChange(GraphicsItemChange change, const QVariant &value);
};
/* 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(ZoomWidget)
public:
ZoomWidget(QWidget *parent = 0);
void setWidget(QWidget *w, Qt::WindowFlags wFlags = 0);
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;
virtual QSize minimumSizeHint() const;
virtual QSize sizeHint() const;
bool zoomedEventFilter(QObject *watched, QEvent *event);
public slots:
// debug state
void dump() const;
protected:
void resizeEvent(QResizeEvent * event);
// Overwritten from ZoomView
virtual void applyZoom();
// 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 = 0, Qt::WindowFlags wFlags = 0) const;
QSize widgetSizeToViewSize(const QSize &s, bool *ptrToValid = 0) const;
void resizeToWidgetSize();
QSize viewPortMargin() const;
QSize widgetSize() const;
QSizeF widgetDecorationSizeF() const;
QGraphicsProxyWidget *m_proxy;
bool m_viewResizeBlocked;
bool m_widgetResizeBlocked;
bool m_widgetZoomContextMenuEnabled;
};
} // namespace qdesigner_internal
QT_END_NAMESPACE
#endif
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