1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** 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 Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_PROPERTY(bool autoScrollSuppressed READ isAutoScrollSuppressed WRITE setAutoScrollSuppressed 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);
// Suppress scrolling when changing zoom. Default: on
bool isAutoScrollSuppressed() const;
void setAutoScrollSuppressed(bool s);
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_autoScrollSuppressed;
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
|
