310 lines
9.6 KiB
C++
310 lines
9.6 KiB
C++
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/****************************************************************************
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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 "interfaces.h"
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#include "mainwindow.h"
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#include "paintarea.h"
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#include "plugindialog.h"
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#include <QPluginLoader>
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#include <QTimer>
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#include <QScrollArea>
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#include <QMessageBox>
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#include <QActionGroup>
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#include <QAction>
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#include <QMenu>
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#include <QMenuBar>
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#include <QFileDialog>
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#include <QColorDialog>
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#include <QInputDialog>
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#include <QApplication>
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MainWindow::MainWindow() :
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paintArea(new PaintArea),
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scrollArea(new QScrollArea)
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{
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scrollArea->setBackgroundRole(QPalette::Dark);
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scrollArea->setWidget(paintArea);
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setCentralWidget(scrollArea);
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createActions();
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createMenus();
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loadPlugins();
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setWindowTitle(tr("Plug & Paint"));
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if (!brushActionGroup->actions().isEmpty())
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brushActionGroup->actions().first()->trigger();
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QTimer::singleShot(500, this, SLOT(aboutPlugins()));
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}
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void MainWindow::open()
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{
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const QString fileName = QFileDialog::getOpenFileName(this,
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tr("Open File"),
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QDir::currentPath());
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if (!fileName.isEmpty()) {
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if (!paintArea->openImage(fileName)) {
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QMessageBox::information(this, tr("Plug & Paint"),
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tr("Cannot load %1.").arg(fileName));
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return;
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}
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paintArea->adjustSize();
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}
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}
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bool MainWindow::saveAs()
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{
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const QString initialPath = QDir::currentPath() + "/untitled.png";
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const QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
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initialPath);
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if (fileName.isEmpty()) {
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return false;
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} else {
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return paintArea->saveImage(fileName, "png");
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}
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}
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void MainWindow::brushColor()
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{
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const QColor newColor = QColorDialog::getColor(paintArea->brushColor());
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if (newColor.isValid())
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paintArea->setBrushColor(newColor);
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}
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void MainWindow::brushWidth()
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{
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bool ok;
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const int newWidth = QInputDialog::getInteger(this, tr("Plug & Paint"),
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tr("Select brush width:"),
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paintArea->brushWidth(),
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1, 50, 1, &ok);
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if (ok)
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paintArea->setBrushWidth(newWidth);
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}
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//! [0]
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void MainWindow::changeBrush()
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{
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QAction *action = qobject_cast<QAction *>(sender());
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BrushInterface *iBrush = qobject_cast<BrushInterface *>(action->parent());
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const QString brush = action->text();
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paintArea->setBrush(iBrush, brush);
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}
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//! [0]
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//! [1]
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void MainWindow::insertShape()
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{
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QAction *action = qobject_cast<QAction *>(sender());
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ShapeInterface *iShape = qobject_cast<ShapeInterface *>(action->parent());
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const QPainterPath path = iShape->generateShape(action->text(), this);
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if (!path.isEmpty())
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paintArea->insertShape(path);
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}
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//! [1]
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//! [2]
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void MainWindow::applyFilter()
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{
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QAction *action = qobject_cast<QAction *>(sender());
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FilterInterface *iFilter =
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qobject_cast<FilterInterface *>(action->parent());
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const QImage image = iFilter->filterImage(action->text(), paintArea->image(),
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this);
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paintArea->setImage(image);
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}
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//! [2]
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void MainWindow::about()
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{
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QMessageBox::about(this, tr("About Plug & Paint"),
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tr("The <b>Plug & Paint</b> example demonstrates how to write Qt "
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"applications that can be extended through plugins."));
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}
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//! [3]
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void MainWindow::aboutPlugins()
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{
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PluginDialog dialog(pluginsDir.path(), pluginFileNames, this);
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dialog.exec();
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}
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//! [3]
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void MainWindow::createActions()
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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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saveAsAct = new QAction(tr("&Save As..."), this);
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saveAsAct->setShortcuts(QKeySequence::SaveAs);
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connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));
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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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brushColorAct = new QAction(tr("&Brush Color..."), this);
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connect(brushColorAct, SIGNAL(triggered()), this, SLOT(brushColor()));
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brushWidthAct = new QAction(tr("&Brush Width..."), this);
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connect(brushWidthAct, SIGNAL(triggered()), this, SLOT(brushWidth()));
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brushActionGroup = new QActionGroup(this);
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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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aboutPluginsAct = new QAction(tr("About &Plugins"), this);
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connect(aboutPluginsAct, SIGNAL(triggered()), this, SLOT(aboutPlugins()));
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}
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void MainWindow::createMenus()
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{
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fileMenu = menuBar()->addMenu(tr("&File"));
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fileMenu->addAction(openAct);
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fileMenu->addAction(saveAsAct);
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fileMenu->addSeparator();
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fileMenu->addAction(exitAct);
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brushMenu = menuBar()->addMenu(tr("&Brush"));
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brushMenu->addAction(brushColorAct);
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brushMenu->addAction(brushWidthAct);
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brushMenu->addSeparator();
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shapesMenu = menuBar()->addMenu(tr("&Shapes"));
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filterMenu = menuBar()->addMenu(tr("&Filter"));
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menuBar()->addSeparator();
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helpMenu = menuBar()->addMenu(tr("&Help"));
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helpMenu->addAction(aboutAct);
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helpMenu->addAction(aboutQtAct);
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helpMenu->addAction(aboutPluginsAct);
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}
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//! [4]
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void MainWindow::loadPlugins()
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{
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foreach (QObject *plugin, QPluginLoader::staticInstances())
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populateMenus(plugin);
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//! [4] //! [5]
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pluginsDir = QDir(qApp->applicationDirPath());
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#if defined(Q_OS_WIN)
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if (pluginsDir.dirName().toLower() == "debug" || pluginsDir.dirName().toLower() == "release")
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pluginsDir.cdUp();
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#elif defined(Q_OS_MAC)
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if (pluginsDir.dirName() == "MacOS") {
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pluginsDir.cdUp();
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pluginsDir.cdUp();
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pluginsDir.cdUp();
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}
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#endif
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pluginsDir.cd("plugins");
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//! [5]
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//! [6]
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foreach (QString fileName, pluginsDir.entryList(QDir::Files)) {
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QPluginLoader loader(pluginsDir.absoluteFilePath(fileName));
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QObject *plugin = loader.instance();
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if (plugin) {
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populateMenus(plugin);
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pluginFileNames += fileName;
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//! [6] //! [7]
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}
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//! [7] //! [8]
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}
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//! [8]
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//! [9]
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brushMenu->setEnabled(!brushActionGroup->actions().isEmpty());
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shapesMenu->setEnabled(!shapesMenu->actions().isEmpty());
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filterMenu->setEnabled(!filterMenu->actions().isEmpty());
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}
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//! [9]
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//! [10]
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void MainWindow::populateMenus(QObject *plugin)
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{
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BrushInterface *iBrush = qobject_cast<BrushInterface *>(plugin);
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if (iBrush)
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addToMenu(plugin, iBrush->brushes(), brushMenu, SLOT(changeBrush()),
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brushActionGroup);
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ShapeInterface *iShape = qobject_cast<ShapeInterface *>(plugin);
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if (iShape)
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addToMenu(plugin, iShape->shapes(), shapesMenu, SLOT(insertShape()));
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FilterInterface *iFilter = qobject_cast<FilterInterface *>(plugin);
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if (iFilter)
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addToMenu(plugin, iFilter->filters(), filterMenu, SLOT(applyFilter()));
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}
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//! [10]
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void MainWindow::addToMenu(QObject *plugin, const QStringList &texts,
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QMenu *menu, const char *member,
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QActionGroup *actionGroup)
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{
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foreach (QString text, texts) {
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QAction *action = new QAction(text, plugin);
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connect(action, SIGNAL(triggered()), this, member);
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menu->addAction(action);
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if (actionGroup) {
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action->setCheckable(true);
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actionGroup->addAction(action);
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}
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}
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}
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