source: trunk/examples/widgets/scribble/mainwindow.cpp@ 1165

Last change on this file since 1165 was 846, checked in by Dmitry A. Kuminov, 14 years ago

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.
File size: 8.0 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation ([email protected])
6**
7** This file is part of the examples of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:BSD$
10** You may use this file under the terms of the BSD license as follows:
11**
12** "Redistribution and use in source and binary forms, with or without
13** modification, are permitted provided that the following conditions are
14** met:
15** * Redistributions of source code must retain the above copyright
16** notice, this list of conditions and the following disclaimer.
17** * Redistributions in binary form must reproduce the above copyright
18** notice, this list of conditions and the following disclaimer in
19** the documentation and/or other materials provided with the
20** distribution.
21** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
22** the names of its contributors may be used to endorse or promote
23** products derived from this software without specific prior written
24** permission.
25**
26** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
27** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
28** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
29** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
30** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
31** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
32** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
33** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
34** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
35** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
36** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
37** $QT_END_LICENSE$
38**
39****************************************************************************/
40
41#include <QtGui>
42
43#include "mainwindow.h"
44#include "scribblearea.h"
45
46//! [0]
47MainWindow::MainWindow()
48{
49 scribbleArea = new ScribbleArea;
50 setCentralWidget(scribbleArea);
51
52 createActions();
53 createMenus();
54
55 setWindowTitle(tr("Scribble"));
56 resize(500, 500);
57}
58//! [0]
59
60//! [1]
61void MainWindow::closeEvent(QCloseEvent *event)
62//! [1] //! [2]
63{
64 if (maybeSave()) {
65 event->accept();
66 } else {
67 event->ignore();
68 }
69}
70//! [2]
71
72//! [3]
73void MainWindow::open()
74//! [3] //! [4]
75{
76 if (maybeSave()) {
77 QString fileName = QFileDialog::getOpenFileName(this,
78 tr("Open File"), QDir::currentPath());
79 if (!fileName.isEmpty())
80 scribbleArea->openImage(fileName);
81 }
82}
83//! [4]
84
85//! [5]
86void MainWindow::save()
87//! [5] //! [6]
88{
89 QAction *action = qobject_cast<QAction *>(sender());
90 QByteArray fileFormat = action->data().toByteArray();
91 saveFile(fileFormat);
92}
93//! [6]
94
95//! [7]
96void MainWindow::penColor()
97//! [7] //! [8]
98{
99 QColor newColor = QColorDialog::getColor(scribbleArea->penColor());
100 if (newColor.isValid())
101 scribbleArea->setPenColor(newColor);
102}
103//! [8]
104
105//! [9]
106void MainWindow::penWidth()
107//! [9] //! [10]
108{
109 bool ok;
110 int newWidth = QInputDialog::getInteger(this, tr("Scribble"),
111 tr("Select pen width:"),
112 scribbleArea->penWidth(),
113 1, 50, 1, &ok);
114 if (ok)
115 scribbleArea->setPenWidth(newWidth);
116}
117//! [10]
118
119//! [11]
120void MainWindow::about()
121//! [11] //! [12]
122{
123 QMessageBox::about(this, tr("About Scribble"),
124 tr("<p>The <b>Scribble</b> example shows how to use QMainWindow as the "
125 "base widget for an application, and how to reimplement some of "
126 "QWidget's event handlers to receive the events generated for "
127 "the application's widgets:</p><p> We reimplement the mouse event "
128 "handlers to facilitate drawing, the paint event handler to "
129 "update the application and the resize event handler to optimize "
130 "the application's appearance. In addition we reimplement the "
131 "close event handler to intercept the close events before "
132 "terminating the application.</p><p> The example also demonstrates "
133 "how to use QPainter to draw an image in real time, as well as "
134 "to repaint widgets.</p>"));
135}
136//! [12]
137
138//! [13]
139void MainWindow::createActions()
140//! [13] //! [14]
141{
142 openAct = new QAction(tr("&Open..."), this);
143 openAct->setShortcuts(QKeySequence::Open);
144 connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
145
146 foreach (QByteArray format, QImageWriter::supportedImageFormats()) {
147 QString text = tr("%1...").arg(QString(format).toUpper());
148
149 QAction *action = new QAction(text, this);
150 action->setData(format);
151 connect(action, SIGNAL(triggered()), this, SLOT(save()));
152 saveAsActs.append(action);
153 }
154
155 printAct = new QAction(tr("&Print..."), this);
156 connect(printAct, SIGNAL(triggered()), scribbleArea, SLOT(print()));
157
158 exitAct = new QAction(tr("E&xit"), this);
159 exitAct->setShortcuts(QKeySequence::Quit);
160 connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
161
162 penColorAct = new QAction(tr("&Pen Color..."), this);
163 connect(penColorAct, SIGNAL(triggered()), this, SLOT(penColor()));
164
165 penWidthAct = new QAction(tr("Pen &Width..."), this);
166 connect(penWidthAct, SIGNAL(triggered()), this, SLOT(penWidth()));
167
168 clearScreenAct = new QAction(tr("&Clear Screen"), this);
169 clearScreenAct->setShortcut(tr("Ctrl+L"));
170 connect(clearScreenAct, SIGNAL(triggered()),
171 scribbleArea, SLOT(clearImage()));
172
173 aboutAct = new QAction(tr("&About"), this);
174 connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
175
176 aboutQtAct = new QAction(tr("About &Qt"), this);
177 connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
178}
179//! [14]
180
181//! [15]
182void MainWindow::createMenus()
183//! [15] //! [16]
184{
185 saveAsMenu = new QMenu(tr("&Save As"), this);
186 foreach (QAction *action, saveAsActs)
187 saveAsMenu->addAction(action);
188
189 fileMenu = new QMenu(tr("&File"), this);
190 fileMenu->addAction(openAct);
191 fileMenu->addMenu(saveAsMenu);
192 fileMenu->addAction(printAct);
193 fileMenu->addSeparator();
194 fileMenu->addAction(exitAct);
195
196 optionMenu = new QMenu(tr("&Options"), this);
197 optionMenu->addAction(penColorAct);
198 optionMenu->addAction(penWidthAct);
199 optionMenu->addSeparator();
200 optionMenu->addAction(clearScreenAct);
201
202 helpMenu = new QMenu(tr("&Help"), this);
203 helpMenu->addAction(aboutAct);
204 helpMenu->addAction(aboutQtAct);
205
206 menuBar()->addMenu(fileMenu);
207 menuBar()->addMenu(optionMenu);
208 menuBar()->addMenu(helpMenu);
209}
210//! [16]
211
212//! [17]
213bool MainWindow::maybeSave()
214//! [17] //! [18]
215{
216 if (scribbleArea->isModified()) {
217 QMessageBox::StandardButton ret;
218 ret = QMessageBox::warning(this, tr("Scribble"),
219 tr("The image has been modified.\n"
220 "Do you want to save your changes?"),
221 QMessageBox::Save | QMessageBox::Discard
222 | QMessageBox::Cancel);
223 if (ret == QMessageBox::Save) {
224 return saveFile("png");
225 } else if (ret == QMessageBox::Cancel) {
226 return false;
227 }
228 }
229 return true;
230}
231//! [18]
232
233//! [19]
234bool MainWindow::saveFile(const QByteArray &fileFormat)
235//! [19] //! [20]
236{
237 QString initialPath = QDir::currentPath() + "/untitled." + fileFormat;
238
239 QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
240 initialPath,
241 tr("%1 Files (*.%2);;All Files (*)")
242 .arg(QString(fileFormat.toUpper()))
243 .arg(QString(fileFormat)));
244 if (fileName.isEmpty()) {
245 return false;
246 } else {
247 return scribbleArea->saveImage(fileName, fileFormat);
248 }
249}
250//! [20]
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