source: trunk/examples/mainwindows/sdi/mainwindow.cpp@ 5

Last change on this file since 5 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 11.3 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
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12** Software or, alternatively, in accordance with the terms contained in
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14**
15** GNU Lesser General Public License Usage
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19** packaging of this file. Please review the following information to
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28** GNU General Public License Usage
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40****************************************************************************/
41
42#include <QtGui>
43
44#include "mainwindow.h"
45
46MainWindow::MainWindow()
47{
48 init();
49 setCurrentFile("");
50}
51
52MainWindow::MainWindow(const QString &fileName)
53{
54 init();
55 loadFile(fileName);
56}
57
58void MainWindow::closeEvent(QCloseEvent *event)
59{
60 if (maybeSave()) {
61 writeSettings();
62 event->accept();
63 } else {
64 event->ignore();
65 }
66}
67
68void MainWindow::newFile()
69{
70 MainWindow *other = new MainWindow;
71 other->move(x() + 40, y() + 40);
72 other->show();
73}
74
75void MainWindow::open()
76{
77 QString fileName = QFileDialog::getOpenFileName(this);
78 if (!fileName.isEmpty()) {
79 MainWindow *existing = findMainWindow(fileName);
80 if (existing) {
81 existing->show();
82 existing->raise();
83 existing->activateWindow();
84 return;
85 }
86
87 if (isUntitled && textEdit->document()->isEmpty()
88 && !isWindowModified()) {
89 loadFile(fileName);
90 } else {
91 MainWindow *other = new MainWindow(fileName);
92 if (other->isUntitled) {
93 delete other;
94 return;
95 }
96 other->move(x() + 40, y() + 40);
97 other->show();
98 }
99 }
100}
101
102bool MainWindow::save()
103{
104 if (isUntitled) {
105 return saveAs();
106 } else {
107 return saveFile(curFile);
108 }
109}
110
111bool MainWindow::saveAs()
112{
113 QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
114 curFile);
115 if (fileName.isEmpty())
116 return false;
117
118 return saveFile(fileName);
119}
120
121void MainWindow::about()
122{
123 QMessageBox::about(this, tr("About SDI"),
124 tr("The <b>SDI</b> example demonstrates how to write single "
125 "document interface applications using Qt."));
126}
127
128void MainWindow::documentWasModified()
129{
130 setWindowModified(true);
131}
132
133void MainWindow::init()
134{
135 setAttribute(Qt::WA_DeleteOnClose);
136
137 isUntitled = true;
138
139 textEdit = new QTextEdit;
140 setCentralWidget(textEdit);
141
142 createActions();
143 createMenus();
144 createToolBars();
145 createStatusBar();
146
147 readSettings();
148
149 connect(textEdit->document(), SIGNAL(contentsChanged()),
150 this, SLOT(documentWasModified()));
151
152 setUnifiedTitleAndToolBarOnMac(true);
153}
154
155void MainWindow::createActions()
156{
157 newAct = new QAction(QIcon(":/images/new.png"), tr("&New"), this);
158 newAct->setShortcuts(QKeySequence::New);
159 newAct->setStatusTip(tr("Create a new file"));
160 connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));
161
162 openAct = new QAction(QIcon(":/images/open.png"), tr("&Open..."), this);
163 openAct->setShortcuts(QKeySequence::Open);
164 openAct->setStatusTip(tr("Open an existing file"));
165 connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
166
167 saveAct = new QAction(QIcon(":/images/save.png"), tr("&Save"), this);
168 saveAct->setShortcuts(QKeySequence::Save);
169 saveAct->setStatusTip(tr("Save the document to disk"));
170 connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));
171
172 saveAsAct = new QAction(tr("Save &As..."), this);
173 saveAsAct->setShortcuts(QKeySequence::SaveAs);
174 saveAsAct->setStatusTip(tr("Save the document under a new name"));
175 connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));
176
177 closeAct = new QAction(tr("&Close"), this);
178 closeAct->setShortcut(tr("Ctrl+W"));
179 closeAct->setStatusTip(tr("Close this window"));
180 connect(closeAct, SIGNAL(triggered()), this, SLOT(close()));
181
182 exitAct = new QAction(tr("E&xit"), this);
183 exitAct->setShortcut(tr("Ctrl+Q"));
184 exitAct->setStatusTip(tr("Exit the application"));
185 connect(exitAct, SIGNAL(triggered()), qApp, SLOT(closeAllWindows()));
186
187 cutAct = new QAction(QIcon(":/images/cut.png"), tr("Cu&t"), this);
188 cutAct->setShortcuts(QKeySequence::Cut);
189 cutAct->setStatusTip(tr("Cut the current selection's contents to the "
190 "clipboard"));
191 connect(cutAct, SIGNAL(triggered()), textEdit, SLOT(cut()));
192
193 copyAct = new QAction(QIcon(":/images/copy.png"), tr("&Copy"), this);
194 copyAct->setShortcuts(QKeySequence::Copy);
195 copyAct->setStatusTip(tr("Copy the current selection's contents to the "
196 "clipboard"));
197 connect(copyAct, SIGNAL(triggered()), textEdit, SLOT(copy()));
198
199 pasteAct = new QAction(QIcon(":/images/paste.png"), tr("&Paste"), this);
200 pasteAct->setShortcuts(QKeySequence::Paste);
201 pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "
202 "selection"));
203 connect(pasteAct, SIGNAL(triggered()), textEdit, SLOT(paste()));
204
205 aboutAct = new QAction(tr("&About"), this);
206 aboutAct->setStatusTip(tr("Show the application's About box"));
207 connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
208
209 aboutQtAct = new QAction(tr("About &Qt"), this);
210 aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));
211 connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
212
213
214 cutAct->setEnabled(false);
215 copyAct->setEnabled(false);
216 connect(textEdit, SIGNAL(copyAvailable(bool)),
217 cutAct, SLOT(setEnabled(bool)));
218 connect(textEdit, SIGNAL(copyAvailable(bool)),
219 copyAct, SLOT(setEnabled(bool)));
220}
221
222//! [implicit tr context]
223void MainWindow::createMenus()
224{
225 fileMenu = menuBar()->addMenu(tr("&File"));
226//! [implicit tr context]
227 fileMenu->addAction(newAct);
228 fileMenu->addAction(openAct);
229 fileMenu->addAction(saveAct);
230 fileMenu->addAction(saveAsAct);
231 fileMenu->addSeparator();
232 fileMenu->addAction(closeAct);
233 fileMenu->addAction(exitAct);
234
235 editMenu = menuBar()->addMenu(tr("&Edit"));
236 editMenu->addAction(cutAct);
237 editMenu->addAction(copyAct);
238 editMenu->addAction(pasteAct);
239
240 menuBar()->addSeparator();
241
242 helpMenu = menuBar()->addMenu(tr("&Help"));
243 helpMenu->addAction(aboutAct);
244 helpMenu->addAction(aboutQtAct);
245}
246
247void MainWindow::createToolBars()
248{
249//! [0]
250 fileToolBar = addToolBar(tr("File"));
251 fileToolBar->addAction(newAct);
252 fileToolBar->addAction(openAct);
253//! [0]
254 fileToolBar->addAction(saveAct);
255
256 editToolBar = addToolBar(tr("Edit"));
257 editToolBar->addAction(cutAct);
258 editToolBar->addAction(copyAct);
259 editToolBar->addAction(pasteAct);
260}
261
262void MainWindow::createStatusBar()
263{
264 statusBar()->showMessage(tr("Ready"));
265}
266
267void MainWindow::readSettings()
268{
269 QSettings settings("Trolltech", "SDI Example");
270 QPoint pos = settings.value("pos", QPoint(200, 200)).toPoint();
271 QSize size = settings.value("size", QSize(400, 400)).toSize();
272 move(pos);
273 resize(size);
274}
275
276void MainWindow::writeSettings()
277{
278 QSettings settings("Trolltech", "SDI Example");
279 settings.setValue("pos", pos());
280 settings.setValue("size", size());
281}
282
283bool MainWindow::maybeSave()
284{
285 if (textEdit->document()->isModified()) {
286 QMessageBox::StandardButton ret;
287 ret = QMessageBox::warning(this, tr("SDI"),
288 tr("The document has been modified.\n"
289 "Do you want to save your changes?"),
290 QMessageBox::Save | QMessageBox::Discard
291 | QMessageBox::Cancel);
292 if (ret == QMessageBox::Save)
293 return save();
294 else if (ret == QMessageBox::Cancel)
295 return false;
296 }
297 return true;
298}
299
300void MainWindow::loadFile(const QString &fileName)
301{
302
303 QFile file(fileName);
304 if (!file.open(QFile::ReadOnly | QFile::Text)) {
305 QMessageBox::warning(this, tr("SDI"),
306 tr("Cannot read file %1:\n%2.")
307 .arg(fileName)
308 .arg(file.errorString()));
309 return;
310 }
311
312 QTextStream in(&file);
313 QApplication::setOverrideCursor(Qt::WaitCursor);
314 textEdit->setPlainText(in.readAll());
315 QApplication::restoreOverrideCursor();
316
317 setCurrentFile(fileName);
318 statusBar()->showMessage(tr("File loaded"), 2000);
319}
320
321bool MainWindow::saveFile(const QString &fileName)
322{
323 QFile file(fileName);
324 if (!file.open(QFile::WriteOnly | QFile::Text)) {
325 QMessageBox::warning(this, tr("SDI"),
326 tr("Cannot write file %1:\n%2.")
327 .arg(fileName)
328 .arg(file.errorString()));
329 return false;
330 }
331
332 QTextStream out(&file);
333 QApplication::setOverrideCursor(Qt::WaitCursor);
334 out << textEdit->toPlainText();
335 QApplication::restoreOverrideCursor();
336
337 setCurrentFile(fileName);
338 statusBar()->showMessage(tr("File saved"), 2000);
339 return true;
340}
341
342void MainWindow::setCurrentFile(const QString &fileName)
343{
344 static int sequenceNumber = 1;
345
346 isUntitled = fileName.isEmpty();
347 if (isUntitled) {
348 curFile = tr("document%1.txt").arg(sequenceNumber++);
349 } else {
350 curFile = QFileInfo(fileName).canonicalFilePath();
351 }
352
353 textEdit->document()->setModified(false);
354 setWindowModified(false);
355
356 setWindowTitle(tr("%1[*] - %2").arg(strippedName(curFile))
357 .arg(tr("SDI")));
358}
359
360QString MainWindow::strippedName(const QString &fullFileName)
361{
362 return QFileInfo(fullFileName).fileName();
363}
364
365MainWindow *MainWindow::findMainWindow(const QString &fileName)
366{
367 QString canonicalFilePath = QFileInfo(fileName).canonicalFilePath();
368
369 foreach (QWidget *widget, qApp->topLevelWidgets()) {
370 MainWindow *mainWin = qobject_cast<MainWindow *>(widget);
371 if (mainWin && mainWin->curFile == canonicalFilePath)
372 return mainWin;
373 }
374 return 0;
375}
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