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<title>Qt 4.2: mainwindow.cpp Example File (tools/plugandpaint/mainwindow.cpp)</title>
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<pre> /****************************************************************************
**
** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file. Please review the following information to ensure GNU
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****************************************************************************/
#include <QtGui>
#include "interfaces.h"
#include "mainwindow.h"
#include "paintarea.h"
#include "plugindialog.h"
MainWindow::MainWindow()
{
paintArea = new PaintArea;
scrollArea = new QScrollArea;
scrollArea->setBackgroundRole(QPalette::Dark);
scrollArea->setWidget(paintArea);
setCentralWidget(scrollArea);
createActions();
createMenus();
loadPlugins();
setWindowTitle(tr("Plug & Paint"));
if (!brushActionGroup->actions().isEmpty())
brushActionGroup->actions().first()->trigger();
QTimer::singleShot(500, this, SLOT(aboutPlugins()));
}
void MainWindow::open()
{
QString fileName = QFileDialog::getOpenFileName(this,
tr("Open File"), QDir::currentPath());
if (!fileName.isEmpty()) {
if (!paintArea->openImage(fileName)) {
QMessageBox::information(this, tr("Plug & Paint"),
tr("Cannot load %1.").arg(fileName));
return;
}
paintArea->adjustSize();
}
}
bool MainWindow::saveAs()
{
QString initialPath = QDir::currentPath() + "/untitled.png";
QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
initialPath);
if (fileName.isEmpty()) {
return false;
} else {
return paintArea->saveImage(fileName, "png");
}
}
void MainWindow::brushColor()
{
QColor newColor = QColorDialog::getColor(paintArea->brushColor());
if (newColor.isValid())
paintArea->setBrushColor(newColor);
}
void MainWindow::brushWidth()
{
bool ok;
int newWidth = QInputDialog::getInteger(this, tr("Plug & Paint"),
tr("Select brush width:"),
paintArea->brushWidth(),
1, 50, 1, &ok);
if (ok)
paintArea->setBrushWidth(newWidth);
}
void MainWindow::changeBrush()
{
QAction *action = qobject_cast<QAction *>(sender());
BrushInterface *iBrush = qobject_cast<BrushInterface *>(action->parent());
QString brush = action->text();
paintArea->setBrush(iBrush, brush);
}
void MainWindow::insertShape()
{
QAction *action = qobject_cast<QAction *>(sender());
ShapeInterface *iShape = qobject_cast<ShapeInterface *>(action->parent());
QPainterPath path = iShape->generateShape(action->text(), this);
if (!path.isEmpty())
paintArea->insertShape(path);
}
void MainWindow::applyFilter()
{
QAction *action = qobject_cast<QAction *>(sender());
FilterInterface *iFilter =
qobject_cast<FilterInterface *>(action->parent());
QImage image = iFilter->filterImage(action->text(), paintArea->image(),
this);
paintArea->setImage(image);
}
void MainWindow::about()
{
QMessageBox::about(this, tr("About Plug & Paint"),
tr("The <b>Plug & Paint</b> example demonstrates how to write Qt "
"applications that can be extended through plugins."));
}
void MainWindow::aboutPlugins()
{
PluginDialog dialog(pluginsDir.path(), pluginFileNames, this);
dialog.exec();
}
void MainWindow::createActions()
{
openAct = new QAction(tr("&Open..."), this);
openAct->setShortcut(tr("Ctrl+O"));
connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
saveAsAct = new QAction(tr("&Save As..."), this);
saveAsAct->setShortcut(tr("Ctrl+S"));
connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));
exitAct = new QAction(tr("E&xit"), this);
exitAct->setShortcut(tr("Ctrl+Q"));
connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
brushColorAct = new QAction(tr("&Brush Color..."), this);
connect(brushColorAct, SIGNAL(triggered()), this, SLOT(brushColor()));
brushWidthAct = new QAction(tr("&Brush Width..."), this);
connect(brushWidthAct, SIGNAL(triggered()), this, SLOT(brushWidth()));
brushActionGroup = new QActionGroup(this);
aboutAct = new QAction(tr("&About"), this);
connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
aboutQtAct = new QAction(tr("About &Qt"), this);
connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
aboutPluginsAct = new QAction(tr("About &Plugins"), this);
connect(aboutPluginsAct, SIGNAL(triggered()), this, SLOT(aboutPlugins()));
}
void MainWindow::createMenus()
{
fileMenu = menuBar()->addMenu(tr("&File"));
fileMenu->addAction(openAct);
fileMenu->addAction(saveAsAct);
fileMenu->addSeparator();
fileMenu->addAction(exitAct);
brushMenu = menuBar()->addMenu(tr("&Brush"));
brushMenu->addAction(brushColorAct);
brushMenu->addAction(brushWidthAct);
brushMenu->addSeparator();
shapesMenu = menuBar()->addMenu(tr("&Shapes"));
filterMenu = menuBar()->addMenu(tr("&Filter"));
menuBar()->addSeparator();
helpMenu = menuBar()->addMenu(tr("&Help"));
helpMenu->addAction(aboutAct);
helpMenu->addAction(aboutQtAct);
helpMenu->addAction(aboutPluginsAct);
}
void MainWindow::loadPlugins()
{
foreach (QObject *plugin, QPluginLoader::staticInstances())
populateMenus(plugin);
pluginsDir = QDir(qApp->applicationDirPath());
#if defined(Q_OS_WIN)
if (pluginsDir.dirName().toLower() == "debug" || pluginsDir.dirName().toLower() == "release")
pluginsDir.cdUp();
#elif defined(Q_OS_MAC)
if (pluginsDir.dirName() == "MacOS") {
pluginsDir.cdUp();
pluginsDir.cdUp();
pluginsDir.cdUp();
}
#endif
pluginsDir.cd("plugins");
foreach (QString fileName, pluginsDir.entryList(QDir::Files)) {
QPluginLoader loader(pluginsDir.absoluteFilePath(fileName));
QObject *plugin = loader.instance();
if (plugin) {
populateMenus(plugin);
pluginFileNames += fileName;
}
}
brushMenu->setEnabled(!brushActionGroup->actions().isEmpty());
shapesMenu->setEnabled(!shapesMenu->actions().isEmpty());
filterMenu->setEnabled(!filterMenu->actions().isEmpty());
}
void MainWindow::populateMenus(QObject *plugin)
{
BrushInterface *iBrush = qobject_cast<BrushInterface *>(plugin);
if (iBrush)
addToMenu(plugin, iBrush->brushes(), brushMenu, SLOT(changeBrush()),
brushActionGroup);
ShapeInterface *iShape = qobject_cast<ShapeInterface *>(plugin);
if (iShape)
addToMenu(plugin, iShape->shapes(), shapesMenu, SLOT(insertShape()));
FilterInterface *iFilter = qobject_cast<FilterInterface *>(plugin);
if (iFilter)
addToMenu(plugin, iFilter->filters(), filterMenu, SLOT(applyFilter()));
}
void MainWindow::addToMenu(QObject *plugin, const QStringList &texts,
QMenu *menu, const char *member,
QActionGroup *actionGroup)
{
foreach (QString text, texts) {
QAction *action = new QAction(text, plugin);
connect(action, SIGNAL(triggered()), this, member);
menu->addAction(action);
if (actionGroup) {
action->setCheckable(true);
actionGroup->addAction(action);
}
}
}</pre>
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