38be0d1383
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251 lines
8.0 KiB
C++
251 lines
8.0 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2011 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 examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtGui>
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#include "mainwindow.h"
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#include "scribblearea.h"
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//! [0]
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MainWindow::MainWindow()
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{
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scribbleArea = new ScribbleArea;
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setCentralWidget(scribbleArea);
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createActions();
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createMenus();
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setWindowTitle(tr("Scribble"));
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resize(500, 500);
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}
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//! [0]
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//! [1]
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void MainWindow::closeEvent(QCloseEvent *event)
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//! [1] //! [2]
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{
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if (maybeSave()) {
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event->accept();
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} else {
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event->ignore();
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}
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}
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//! [2]
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//! [3]
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void MainWindow::open()
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//! [3] //! [4]
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{
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if (maybeSave()) {
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QString fileName = QFileDialog::getOpenFileName(this,
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tr("Open File"), QDir::currentPath());
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if (!fileName.isEmpty())
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scribbleArea->openImage(fileName);
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}
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}
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//! [4]
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//! [5]
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void MainWindow::save()
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//! [5] //! [6]
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{
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QAction *action = qobject_cast<QAction *>(sender());
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QByteArray fileFormat = action->data().toByteArray();
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saveFile(fileFormat);
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}
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//! [6]
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//! [7]
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void MainWindow::penColor()
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//! [7] //! [8]
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{
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QColor newColor = QColorDialog::getColor(scribbleArea->penColor());
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if (newColor.isValid())
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scribbleArea->setPenColor(newColor);
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}
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//! [8]
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//! [9]
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void MainWindow::penWidth()
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//! [9] //! [10]
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{
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bool ok;
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int newWidth = QInputDialog::getInteger(this, tr("Scribble"),
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tr("Select pen width:"),
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scribbleArea->penWidth(),
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1, 50, 1, &ok);
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if (ok)
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scribbleArea->setPenWidth(newWidth);
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}
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//! [10]
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//! [11]
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void MainWindow::about()
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//! [11] //! [12]
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{
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QMessageBox::about(this, tr("About Scribble"),
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tr("<p>The <b>Scribble</b> example shows how to use QMainWindow as the "
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"base widget for an application, and how to reimplement some of "
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"QWidget's event handlers to receive the events generated for "
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"the application's widgets:</p><p> We reimplement the mouse event "
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"handlers to facilitate drawing, the paint event handler to "
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"update the application and the resize event handler to optimize "
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"the application's appearance. In addition we reimplement the "
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"close event handler to intercept the close events before "
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"terminating the application.</p><p> The example also demonstrates "
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"how to use QPainter to draw an image in real time, as well as "
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"to repaint widgets.</p>"));
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}
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//! [12]
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//! [13]
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void MainWindow::createActions()
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//! [13] //! [14]
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{
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openAct = new QAction(tr("&Open..."), this);
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openAct->setShortcuts(QKeySequence::Open);
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connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
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foreach (QByteArray format, QImageWriter::supportedImageFormats()) {
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QString text = tr("%1...").arg(QString(format).toUpper());
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QAction *action = new QAction(text, this);
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action->setData(format);
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connect(action, SIGNAL(triggered()), this, SLOT(save()));
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saveAsActs.append(action);
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}
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printAct = new QAction(tr("&Print..."), this);
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connect(printAct, SIGNAL(triggered()), scribbleArea, SLOT(print()));
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exitAct = new QAction(tr("E&xit"), this);
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exitAct->setShortcuts(QKeySequence::Quit);
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connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
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penColorAct = new QAction(tr("&Pen Color..."), this);
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connect(penColorAct, SIGNAL(triggered()), this, SLOT(penColor()));
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penWidthAct = new QAction(tr("Pen &Width..."), this);
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connect(penWidthAct, SIGNAL(triggered()), this, SLOT(penWidth()));
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clearScreenAct = new QAction(tr("&Clear Screen"), this);
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clearScreenAct->setShortcut(tr("Ctrl+L"));
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connect(clearScreenAct, SIGNAL(triggered()),
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scribbleArea, SLOT(clearImage()));
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aboutAct = new QAction(tr("&About"), this);
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connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
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aboutQtAct = new QAction(tr("About &Qt"), this);
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connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
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}
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//! [14]
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//! [15]
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void MainWindow::createMenus()
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//! [15] //! [16]
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{
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saveAsMenu = new QMenu(tr("&Save As"), this);
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foreach (QAction *action, saveAsActs)
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saveAsMenu->addAction(action);
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fileMenu = new QMenu(tr("&File"), this);
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fileMenu->addAction(openAct);
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fileMenu->addMenu(saveAsMenu);
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fileMenu->addAction(printAct);
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fileMenu->addSeparator();
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fileMenu->addAction(exitAct);
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optionMenu = new QMenu(tr("&Options"), this);
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optionMenu->addAction(penColorAct);
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optionMenu->addAction(penWidthAct);
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optionMenu->addSeparator();
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optionMenu->addAction(clearScreenAct);
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helpMenu = new QMenu(tr("&Help"), this);
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helpMenu->addAction(aboutAct);
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helpMenu->addAction(aboutQtAct);
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menuBar()->addMenu(fileMenu);
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menuBar()->addMenu(optionMenu);
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menuBar()->addMenu(helpMenu);
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}
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//! [16]
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//! [17]
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bool MainWindow::maybeSave()
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//! [17] //! [18]
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{
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if (scribbleArea->isModified()) {
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QMessageBox::StandardButton ret;
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ret = QMessageBox::warning(this, tr("Scribble"),
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tr("The image has been modified.\n"
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"Do you want to save your changes?"),
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QMessageBox::Save | QMessageBox::Discard
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| QMessageBox::Cancel);
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if (ret == QMessageBox::Save) {
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return saveFile("png");
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} else if (ret == QMessageBox::Cancel) {
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return false;
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}
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}
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return true;
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}
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//! [18]
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//! [19]
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bool MainWindow::saveFile(const QByteArray &fileFormat)
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//! [19] //! [20]
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{
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QString initialPath = QDir::currentPath() + "/untitled." + fileFormat;
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QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
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initialPath,
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tr("%1 Files (*.%2);;All Files (*)")
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.arg(QString(fileFormat.toUpper()))
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.arg(QString(fileFormat)));
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if (fileName.isEmpty()) {
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return false;
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} else {
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return scribbleArea->saveImage(fileName, fileFormat);
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}
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}
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//! [20]
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