qt-everywhere-src-5.14.1/qtbase/examples/widgets/tools/plugandpaint/app/mainwindow.cpp - orbit - Git at Google

 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** BSD License Usage
 ** Alternatively, you may use this file under the terms of the BSD license
 ** as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/


 #include "mainwindow.h"
 #include "interfaces.h"
 #include "paintarea.h"
 #include "plugindialog.h"

 #include <QAction>
 #include <QActionGroup>
 #include <QApplication>
 #include <QColorDialog>
 #include <QFileDialog>
 #include <QInputDialog>
 #include <QMenu>
 #include <QMenuBar>
 #include <QMessageBox>
 #include <QPluginLoader>
 #include <QScrollArea>
 #include <QTimer>

 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, &MainWindow::aboutPlugins);
 }

 void MainWindow::open()
 {
     const 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()
 {
     const QString initialPath = QDir::currentPath() + "/untitled.png";

     const QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
                                                           initialPath);
     if (fileName.isEmpty())
         return false;

     return paintArea->saveImage(fileName, "png");
 }

 void MainWindow::brushColor()
 {
     const QColor newColor = QColorDialog::getColor(paintArea->brushColor());
     if (newColor.isValid())
         paintArea->setBrushColor(newColor);
 }

 void MainWindow::brushWidth()
 {
     bool ok;
     const int newWidth = QInputDialog::getInt(this, tr("Plug & Paint"),
                                               tr("Select brush width:"),
                                               paintArea->brushWidth(),
                                               1, 50, 1, &ok);
     if (ok)
         paintArea->setBrushWidth(newWidth);
 }

 //! [0]
 void MainWindow::changeBrush()
 {
     auto action = qobject_cast<QAction *>(sender());
     if (!action)
       return;
     auto iBrush = qobject_cast<BrushInterface *>(action->parent());
     if (!iBrush)
       return;
     const QString brush = action->text();

     paintArea->setBrush(iBrush, brush);
 }
 //! [0]

 //! [1]
 void MainWindow::insertShape()
 {
     auto action = qobject_cast<QAction *>(sender());
     if (!action)
       return;
     auto iShape = qobject_cast<ShapeInterface *>(action->parent());
     if (!iShape)
       return;

     const QPainterPath path = iShape->generateShape(action->text(), this);
     if (!path.isEmpty())
         paintArea->insertShape(path);
 }
 //! [1]

 //! [2]
 void MainWindow::applyFilter()
 {
     auto action = qobject_cast<QAction *>(sender());
     if (!action)
       return;
     auto iFilter = qobject_cast<FilterInterface *>(action->parent());
     if (!iFilter)
       return;

     const QImage image = iFilter->filterImage(action->text(), paintArea->image(),
                                               this);
     paintArea->setImage(image);
 }
 //! [2]

 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."));
 }

 //! [3]
 void MainWindow::aboutPlugins()
 {
     PluginDialog dialog(pluginsDir.path(), pluginFileNames, this);
     dialog.exec();
 }
 //! [3]

 void MainWindow::createActions()
 {
     openAct = new QAction(tr("&Open..."), this);
     openAct->setShortcuts(QKeySequence::Open);
     connect(openAct, &QAction::triggered, this, &MainWindow::open);

     saveAsAct = new QAction(tr("&Save As..."), this);
     saveAsAct->setShortcuts(QKeySequence::SaveAs);
     connect(saveAsAct, &QAction::triggered, this, &MainWindow::saveAs);

     exitAct = new QAction(tr("E&xit"), this);
     exitAct->setShortcuts(QKeySequence::Quit);
     connect(exitAct, &QAction::triggered, this, &MainWindow::close);

     brushColorAct = new QAction(tr("&Brush Color..."), this);
     connect(brushColorAct, &QAction::triggered, this, &MainWindow::brushColor);

     brushWidthAct = new QAction(tr("&Brush Width..."), this);
     connect(brushWidthAct, &QAction::triggered, this, &MainWindow::brushWidth);

     brushActionGroup = new QActionGroup(this);

     aboutAct = new QAction(tr("&About"), this);
     connect(aboutAct, &QAction::triggered, this, &MainWindow::about);

     aboutQtAct = new QAction(tr("About &Qt"), this);
     connect(aboutQtAct, &QAction::triggered, qApp, &QApplication::aboutQt);

     aboutPluginsAct = new QAction(tr("About &Plugins"), this);
     connect(aboutPluginsAct, &QAction::triggered, this, &MainWindow::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);
 }

 //! [4]
 void MainWindow::loadPlugins()
 {
     const auto staticInstances = QPluginLoader::staticInstances();
     for (QObject *plugin : staticInstances)
         populateMenus(plugin);
 //! [4] //! [5]

     pluginsDir = QDir(QCoreApplication::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");
 //! [5]

 //! [6]
     const auto entryList = pluginsDir.entryList(QDir::Files);
     for (const QString &fileName : entryList) {
         QPluginLoader loader(pluginsDir.absoluteFilePath(fileName));
         QObject *plugin = loader.instance();
         if (plugin) {
             populateMenus(plugin);
             pluginFileNames += fileName;
 //! [6] //! [7]
         }
 //! [7] //! [8]
     }
 //! [8]

 //! [9]
     brushMenu->setEnabled(!brushActionGroup->actions().isEmpty());
     shapesMenu->setEnabled(!shapesMenu->actions().isEmpty());
     filterMenu->setEnabled(!filterMenu->actions().isEmpty());
 }
 //! [9]

 //! [10]
 void MainWindow::populateMenus(QObject *plugin)
 {
     auto iBrush = qobject_cast<BrushInterface *>(plugin);
     if (iBrush)
         addToMenu(plugin, iBrush->brushes(), brushMenu, &MainWindow::changeBrush,
                   brushActionGroup);

     auto iShape = qobject_cast<ShapeInterface *>(plugin);
     if (iShape)
         addToMenu(plugin, iShape->shapes(), shapesMenu, &MainWindow::insertShape);

     auto iFilter = qobject_cast<FilterInterface *>(plugin);
     if (iFilter)
         addToMenu(plugin, iFilter->filters(), filterMenu, &MainWindow::applyFilter);
 }
 //! [10]

 void MainWindow::addToMenu(QObject *plugin, const QStringList &texts,
                            QMenu *menu, Member member,
                            QActionGroup *actionGroup)
 {
     for (const QString &text : texts) {
         auto action = new QAction(text, plugin);
         connect(action, &QAction::triggered, this, member);
         menu->addAction(action);

         if (actionGroup) {
             action->setCheckable(true);
             actionGroup->addAction(action);
         }
     }
 }
	/****************************************************************************
	**
	** Copyright (C) 2016 The Qt Company Ltd.
	** Contact: https://www.qt.io/licensing/
	**
	** This file is part of the examples of the Qt Toolkit.
	**
	** $QT_BEGIN_LICENSE:BSD$
	** Commercial License Usage
	** Licensees holding valid commercial Qt licenses may use this file in
	** accordance with the commercial license agreement provided with the
	** Software or, alternatively, in accordance with the terms contained in
	** a written agreement between you and The Qt Company. For licensing terms
	** and conditions see https://www.qt.io/terms-conditions. For further
	** information use the contact form at https://www.qt.io/contact-us.
	**
	** BSD License Usage
	** Alternatively, you may use this file under the terms of the BSD license
	** as follows:
	**
	** "Redistribution and use in source and binary forms, with or without
	** modification, are permitted provided that the following conditions are
	** met:
	** * Redistributions of source code must retain the above copyright
	** notice, this list of conditions and the following disclaimer.
	** * Redistributions in binary form must reproduce the above copyright
	** notice, this list of conditions and the following disclaimer in
	** the documentation and/or other materials provided with the
	** distribution.
	** * Neither the name of The Qt Company Ltd nor the names of its
	** contributors may be used to endorse or promote products derived
	** from this software without specific prior written permission.
	**
	**
	** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
	**
	** $QT_END_LICENSE$
	**
	****************************************************************************/


	#include "mainwindow.h"
	#include "interfaces.h"
	#include "paintarea.h"
	#include "plugindialog.h"

	#include <QAction>
	#include <QActionGroup>
	#include <QApplication>
	#include <QColorDialog>
	#include <QFileDialog>
	#include <QInputDialog>
	#include <QMenu>
	#include <QMenuBar>
	#include <QMessageBox>
	#include <QPluginLoader>
	#include <QScrollArea>
	#include <QTimer>

	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, &MainWindow::aboutPlugins);
	}

	void MainWindow::open()
	{
	const 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()
	{
	const QString initialPath = QDir::currentPath() + "/untitled.png";

	const QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
	initialPath);
	if (fileName.isEmpty())
	return false;

	return paintArea->saveImage(fileName, "png");
	}

	void MainWindow::brushColor()
	{
	const QColor newColor = QColorDialog::getColor(paintArea->brushColor());
	if (newColor.isValid())
	paintArea->setBrushColor(newColor);
	}

	void MainWindow::brushWidth()
	{
	bool ok;
	const int newWidth = QInputDialog::getInt(this, tr("Plug & Paint"),
	tr("Select brush width:"),
	paintArea->brushWidth(),
	1, 50, 1, &ok);
	if (ok)
	paintArea->setBrushWidth(newWidth);
	}

	//! [0]
	void MainWindow::changeBrush()
	{
	auto action = qobject_cast<QAction *>(sender());
	if (!action)
	return;
	auto iBrush = qobject_cast<BrushInterface *>(action->parent());
	if (!iBrush)
	return;
	const QString brush = action->text();

	paintArea->setBrush(iBrush, brush);
	}
	//! [0]

	//! [1]
	void MainWindow::insertShape()
	{
	auto action = qobject_cast<QAction *>(sender());
	if (!action)
	return;
	auto iShape = qobject_cast<ShapeInterface *>(action->parent());
	if (!iShape)
	return;

	const QPainterPath path = iShape->generateShape(action->text(), this);
	if (!path.isEmpty())
	paintArea->insertShape(path);
	}
	//! [1]

	//! [2]
	void MainWindow::applyFilter()
	{
	auto action = qobject_cast<QAction *>(sender());
	if (!action)
	return;
	auto iFilter = qobject_cast<FilterInterface *>(action->parent());
	if (!iFilter)
	return;

	const QImage image = iFilter->filterImage(action->text(), paintArea->image(),
	this);
	paintArea->setImage(image);
	}
	//! [2]

	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."));
	}

	//! [3]
	void MainWindow::aboutPlugins()
	{
	PluginDialog dialog(pluginsDir.path(), pluginFileNames, this);
	dialog.exec();
	}
	//! [3]

	void MainWindow::createActions()
	{
	openAct = new QAction(tr("&Open..."), this);
	openAct->setShortcuts(QKeySequence::Open);
	connect(openAct, &QAction::triggered, this, &MainWindow::open);

	saveAsAct = new QAction(tr("&Save As..."), this);
	saveAsAct->setShortcuts(QKeySequence::SaveAs);
	connect(saveAsAct, &QAction::triggered, this, &MainWindow::saveAs);

	exitAct = new QAction(tr("E&xit"), this);
	exitAct->setShortcuts(QKeySequence::Quit);
	connect(exitAct, &QAction::triggered, this, &MainWindow::close);

	brushColorAct = new QAction(tr("&Brush Color..."), this);
	connect(brushColorAct, &QAction::triggered, this, &MainWindow::brushColor);

	brushWidthAct = new QAction(tr("&Brush Width..."), this);
	connect(brushWidthAct, &QAction::triggered, this, &MainWindow::brushWidth);

	brushActionGroup = new QActionGroup(this);

	aboutAct = new QAction(tr("&About"), this);
	connect(aboutAct, &QAction::triggered, this, &MainWindow::about);

	aboutQtAct = new QAction(tr("About &Qt"), this);
	connect(aboutQtAct, &QAction::triggered, qApp, &QApplication::aboutQt);

	aboutPluginsAct = new QAction(tr("About &Plugins"), this);
	connect(aboutPluginsAct, &QAction::triggered, this, &MainWindow::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);
	}

	//! [4]
	void MainWindow::loadPlugins()
	{
	const auto staticInstances = QPluginLoader::staticInstances();
	for (QObject *plugin : staticInstances)
	populateMenus(plugin);
	//! [4] //! [5]

	pluginsDir = QDir(QCoreApplication::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");
	//! [5]

	//! [6]
	const auto entryList = pluginsDir.entryList(QDir::Files);
	for (const QString &fileName : entryList) {
	QPluginLoader loader(pluginsDir.absoluteFilePath(fileName));
	QObject *plugin = loader.instance();
	if (plugin) {
	populateMenus(plugin);
	pluginFileNames += fileName;
	//! [6] //! [7]
	}
	//! [7] //! [8]
	}
	//! [8]

	//! [9]
	brushMenu->setEnabled(!brushActionGroup->actions().isEmpty());
	shapesMenu->setEnabled(!shapesMenu->actions().isEmpty());
	filterMenu->setEnabled(!filterMenu->actions().isEmpty());
	}
	//! [9]

	//! [10]
	void MainWindow::populateMenus(QObject *plugin)
	{
	auto iBrush = qobject_cast<BrushInterface *>(plugin);
	if (iBrush)
	addToMenu(plugin, iBrush->brushes(), brushMenu, &MainWindow::changeBrush,
	brushActionGroup);

	auto iShape = qobject_cast<ShapeInterface *>(plugin);
	if (iShape)
	addToMenu(plugin, iShape->shapes(), shapesMenu, &MainWindow::insertShape);

	auto iFilter = qobject_cast<FilterInterface *>(plugin);
	if (iFilter)
	addToMenu(plugin, iFilter->filters(), filterMenu, &MainWindow::applyFilter);
	}
	//! [10]

	void MainWindow::addToMenu(QObject *plugin, const QStringList &texts,
	QMenu *menu, Member member,
	QActionGroup *actionGroup)
	{
	for (const QString &text : texts) {
	auto action = new QAction(text, plugin);
	connect(action, &QAction::triggered, this, member);
	menu->addAction(action);

	if (actionGroup) {
	action->setCheckable(true);
	actionGroup->addAction(action);
	}
	}
	}