232 lines
7.2 KiB
C++
232 lines
7.2 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Designer of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial Usage
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Nokia.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt API. It exists for the convenience
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// of Qt Designer. This header
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// file may change from version to version without notice, or even be removed.
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//
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// We mean it.
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//
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#ifndef ZOOMWIDGET_H
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#define ZOOMWIDGET_H
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#include "shared_global_p.h"
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#include <QtGui/QGraphicsView>
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#include <QtGui/QGraphicsProxyWidget>
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#include <QtCore/QList>
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QT_BEGIN_NAMESPACE
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class QGraphicsScene;
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class QMenu;
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class QAction;
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class QActionGroup;
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namespace qdesigner_internal {
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// A checkable zoom menu action group. Operates in percent.
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class QDESIGNER_SHARED_EXPORT ZoomMenu : public QObject {
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Q_OBJECT
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Q_DISABLE_COPY(ZoomMenu)
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public:
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ZoomMenu(QObject *parent = 0);
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void addActions(QMenu *m);
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int zoom() const;
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// Return a list of available zoom values.
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static QList<int> zoomValues();
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public slots:
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void setZoom(int percent);
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signals:
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void zoomChanged(int);
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private slots:
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void slotZoomMenu(QAction *);
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private:
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static int zoomOf(const QAction *a);
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QActionGroup *m_menuActions;
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};
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/* Zoom view: A QGraphicsView with a zoom menu */
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class QDESIGNER_SHARED_EXPORT ZoomView : public QGraphicsView
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{
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Q_PROPERTY(int zoom READ zoom WRITE setZoom DESIGNABLE true SCRIPTABLE true)
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Q_PROPERTY(bool zoomContextMenuEnabled READ isZoomContextMenuEnabled WRITE setZoomContextMenuEnabled DESIGNABLE true SCRIPTABLE true)
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Q_OBJECT
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Q_DISABLE_COPY(ZoomView)
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public:
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ZoomView(QWidget *parent = 0);
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/* Zoom in percent (for easily implementing menus) and qreal zoomFactor
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* in sync */
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int zoom() const; // in percent
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qreal zoomFactor() const;
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// Zoom Menu on QGraphicsView.
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bool isZoomContextMenuEnabled() const;
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void setZoomContextMenuEnabled(bool e);
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QGraphicsScene &scene() { return *m_scene; }
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const QGraphicsScene &scene() const { return *m_scene; }
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// Helpers for menu
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ZoomMenu *zoomMenu();
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QPoint scrollPosition() const;
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void setScrollPosition(const QPoint& pos);
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void scrollToOrigin();
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public slots:
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void setZoom(int percent);
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void showContextMenu(const QPoint &globalPos);
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protected:
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void contextMenuEvent(QContextMenuEvent *event);
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// Overwrite for implementing additional behaviour when doing setZoom();
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virtual void applyZoom();
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private:
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QGraphicsScene *m_scene;
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int m_zoom;
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qreal m_zoomFactor;
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bool m_zoomContextMenuEnabled;
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bool m_resizeBlocked;
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ZoomMenu *m_zoomMenu;
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};
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/* The proxy widget used in ZoomWidget. It refuses to move away from 0,0,
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* This behaviour is required for Windows only. */
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class QDESIGNER_SHARED_EXPORT ZoomProxyWidget : public QGraphicsProxyWidget {
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Q_DISABLE_COPY(ZoomProxyWidget)
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public:
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explicit ZoomProxyWidget(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0);
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protected:
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virtual QVariant itemChange(GraphicsItemChange change, const QVariant &value);
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};
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/* Zoom widget: A QGraphicsView-based container for a widget that allows for
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* zooming it. Communicates changes in size in the following ways:
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* 1) Embedded widget wants to resize: Listen for its resize in event filter
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* and resize
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* 2) Zoom is changed: resize to fully display the embedded widget
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* 3) Outer widget changes (by manually resizing the window:
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* Pass the scaled change on to the embedded widget.
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* Provides helper functions for a zoom context menu on the widget. */
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class QDESIGNER_SHARED_EXPORT ZoomWidget : public ZoomView
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{
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Q_PROPERTY(bool widgetZoomContextMenuEnabled READ isWidgetZoomContextMenuEnabled WRITE setWidgetZoomContextMenuEnabled DESIGNABLE true SCRIPTABLE true)
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Q_PROPERTY(bool itemAcceptDrops READ itemAcceptDrops WRITE setItemAcceptDrops DESIGNABLE true SCRIPTABLE true)
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Q_OBJECT
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Q_DISABLE_COPY(ZoomWidget)
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public:
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ZoomWidget(QWidget *parent = 0);
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void setWidget(QWidget *w, Qt::WindowFlags wFlags = 0);
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const QGraphicsProxyWidget *proxy() const { return m_proxy; }
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QGraphicsProxyWidget *proxy() { return m_proxy; }
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/* Enable the zoom Menu on the Widget (as opposed ZoomView's menu which
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* is on the canvas). */
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bool isWidgetZoomContextMenuEnabled() const;
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void setWidgetZoomContextMenuEnabled(bool e);
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void setItemAcceptDrops(bool);
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bool itemAcceptDrops() const;
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virtual QSize minimumSizeHint() const;
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virtual QSize sizeHint() const;
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bool zoomedEventFilter(QObject *watched, QEvent *event);
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public slots:
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// debug state
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void dump() const;
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protected:
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void resizeEvent(QResizeEvent * event);
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// Overwritten from ZoomView
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virtual void applyZoom();
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// Overwrite to actually perform a resize. This is required if we are in a layout. Default does resize().
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virtual void doResize(const QSize &s);
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private:
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// Factory function for QGraphicsProxyWidgets which can be overwritten. Default creates a ZoomProxyWidget
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virtual QGraphicsProxyWidget *createProxyWidget(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0) const;
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QSize widgetSizeToViewSize(const QSize &s, bool *ptrToValid = 0) const;
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void resizeToWidgetSize();
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QSize viewPortMargin() const;
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QSize widgetSize() const;
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QSizeF widgetDecorationSizeF() const;
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QGraphicsProxyWidget *m_proxy;
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bool m_viewResizeBlocked;
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bool m_widgetResizeBlocked;
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bool m_widgetZoomContextMenuEnabled;
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};
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} // namespace qdesigner_internal
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QT_END_NAMESPACE
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#endif
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