5635823e17
As in the past, to avoid rewriting various autotests that contain line-number information, an extra blank line has been inserted at the end of the license text to ensure that this commit does not change the total number of lines in the license header. Change-Id: I311e001373776812699d6efc045b5f742890c689 Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
251 lines
8.0 KiB
C++
251 lines
8.0 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/
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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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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtWidgets>
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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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