source: trunk/examples/widgets/scribble/scribblearea.cpp@ 266

Last change on this file since 266 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.

File size: 5.7 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information ([email protected])
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial Usage
10** Licensees holding valid Qt Commercial licenses may use this file in
11** accordance with the Qt Commercial License Agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Nokia.
14**
15** GNU Lesser General Public License Usage
16** Alternatively, this file may be used under the terms of the GNU Lesser
17** General Public License version 2.1 as published by the Free Software
18** Foundation and appearing in the file LICENSE.LGPL included in the
19** packaging of this file. Please review the following information to
20** ensure the GNU Lesser General Public License version 2.1 requirements
21** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
22**
23** In addition, as a special exception, Nokia gives you certain
24** additional rights. These rights are described in the Nokia Qt LGPL
25** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
26** package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
35**
36** If you are unsure which license is appropriate for your use, please
37** contact the sales department at [email protected].
38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42#include <QtGui>
43
44#include "scribblearea.h"
45
46//! [0]
47ScribbleArea::ScribbleArea(QWidget *parent)
48 : QWidget(parent)
49{
50 setAttribute(Qt::WA_StaticContents);
51 modified = false;
52 scribbling = false;
53 myPenWidth = 1;
54 myPenColor = Qt::blue;
55}
56//! [0]
57
58//! [1]
59bool ScribbleArea::openImage(const QString &fileName)
60//! [1] //! [2]
61{
62 QImage loadedImage;
63 if (!loadedImage.load(fileName))
64 return false;
65
66 QSize newSize = loadedImage.size().expandedTo(size());
67 resizeImage(&loadedImage, newSize);
68 image = loadedImage;
69 modified = false;
70 update();
71 return true;
72}
73//! [2]
74
75//! [3]
76bool ScribbleArea::saveImage(const QString &fileName, const char *fileFormat)
77//! [3] //! [4]
78{
79 QImage visibleImage = image;
80 resizeImage(&visibleImage, size());
81
82 if (visibleImage.save(fileName, fileFormat)) {
83 modified = false;
84 return true;
85 } else {
86 return false;
87 }
88}
89//! [4]
90
91//! [5]
92void ScribbleArea::setPenColor(const QColor &newColor)
93//! [5] //! [6]
94{
95 myPenColor = newColor;
96}
97//! [6]
98
99//! [7]
100void ScribbleArea::setPenWidth(int newWidth)
101//! [7] //! [8]
102{
103 myPenWidth = newWidth;
104}
105//! [8]
106
107//! [9]
108void ScribbleArea::clearImage()
109//! [9] //! [10]
110{
111 image.fill(qRgb(255, 255, 255));
112 modified = true;
113 update();
114}
115//! [10]
116
117//! [11]
118void ScribbleArea::mousePressEvent(QMouseEvent *event)
119//! [11] //! [12]
120{
121 if (event->button() == Qt::LeftButton) {
122 lastPoint = event->pos();
123 scribbling = true;
124 }
125}
126
127void ScribbleArea::mouseMoveEvent(QMouseEvent *event)
128{
129 if ((event->buttons() & Qt::LeftButton) && scribbling)
130 drawLineTo(event->pos());
131}
132
133void ScribbleArea::mouseReleaseEvent(QMouseEvent *event)
134{
135 if (event->button() == Qt::LeftButton && scribbling) {
136 drawLineTo(event->pos());
137 scribbling = false;
138 }
139}
140
141//! [12] //! [13]
142void ScribbleArea::paintEvent(QPaintEvent * /* event */)
143//! [13] //! [14]
144{
145 QPainter painter(this);
146 painter.drawImage(QPoint(0, 0), image);
147}
148//! [14]
149
150//! [15]
151void ScribbleArea::resizeEvent(QResizeEvent *event)
152//! [15] //! [16]
153{
154 if (width() > image.width() || height() > image.height()) {
155 int newWidth = qMax(width() + 128, image.width());
156 int newHeight = qMax(height() + 128, image.height());
157 resizeImage(&image, QSize(newWidth, newHeight));
158 update();
159 }
160 QWidget::resizeEvent(event);
161}
162//! [16]
163
164//! [17]
165void ScribbleArea::drawLineTo(const QPoint &endPoint)
166//! [17] //! [18]
167{
168 QPainter painter(&image);
169 painter.setPen(QPen(myPenColor, myPenWidth, Qt::SolidLine, Qt::RoundCap,
170 Qt::RoundJoin));
171 painter.drawLine(lastPoint, endPoint);
172 modified = true;
173
174 int rad = (myPenWidth / 2) + 2;
175 update(QRect(lastPoint, endPoint).normalized()
176 .adjusted(-rad, -rad, +rad, +rad));
177 lastPoint = endPoint;
178}
179//! [18]
180
181//! [19]
182void ScribbleArea::resizeImage(QImage *image, const QSize &newSize)
183//! [19] //! [20]
184{
185 if (image->size() == newSize)
186 return;
187
188 QImage newImage(newSize, QImage::Format_RGB32);
189 newImage.fill(qRgb(255, 255, 255));
190 QPainter painter(&newImage);
191 painter.drawImage(QPoint(0, 0), *image);
192 *image = newImage;
193}
194//! [20]
195
196//! [21]
197void ScribbleArea::print()
198{
199#ifndef QT_NO_PRINTER
200 QPrinter printer(QPrinter::HighResolution);
201
202 QPrintDialog *printDialog = new QPrintDialog(&printer, this);
203//! [21] //! [22]
204 if (printDialog->exec() == QDialog::Accepted) {
205 QPainter painter(&printer);
206 QRect rect = painter.viewport();
207 QSize size = image.size();
208 size.scale(rect.size(), Qt::KeepAspectRatio);
209 painter.setViewport(rect.x(), rect.y(), size.width(), size.height());
210 painter.setWindow(image.rect());
211 painter.drawImage(0, 0, image);
212 }
213#endif // QT_NO_PRINTER
214}
215//! [22]
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