#include "interfaces.h"
#include "mainwindow.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);
}
void MainWindow::changeBrush()
{
auto action = qobject_cast<QAction *>(sender());
auto iBrush = qobject_cast<BrushInterface *>(action->parent());
const QString brush = action->text();
paintArea->setBrush(iBrush, brush);
}
void MainWindow::insertShape()
{
auto action = qobject_cast<QAction *>(sender());
auto iShape = qobject_cast<ShapeInterface *>(action->parent());
const QPainterPath path = iShape->generateShape(action->text(), this);
if (!path.isEmpty())
paintArea->insertShape(path);
}
void MainWindow::applyFilter()
{
auto action = qobject_cast<QAction *>(sender());
auto iFilter = qobject_cast<FilterInterface *>(action->parent());
const 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->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);
}
void MainWindow::loadPlugins()
{
const auto staticInstances = QPluginLoader::staticInstances();
for (QObject *plugin : 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");
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;
}
}
brushMenu->setEnabled(!brushActionGroup->actions().isEmpty());
shapesMenu->setEnabled(!shapesMenu->actions().isEmpty());
filterMenu->setEnabled(!filterMenu->actions().isEmpty());
}
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);
}
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);
}
}
}