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| |
| #include "mainwindow.h" |
| #include "diagramscene.h" |
| #include "diagramitem.h" |
| #include "commands.h" |
| |
| #include <QAction> |
| #include <QGraphicsView> |
| #include <QMenu> |
| #include <QMenuBar> |
| #include <QMessageBox> |
| #include <QUndoView> |
| |
| //! [0] |
| MainWindow::MainWindow() |
| { |
| undoStack = new QUndoStack(this); |
| |
| createActions(); |
| createMenus(); |
| |
| createUndoView(); |
| |
| diagramScene = new DiagramScene(); |
| QBrush pixmapBrush(QPixmap(":/images/cross.png").scaled(30, 30)); |
| diagramScene->setBackgroundBrush(pixmapBrush); |
| diagramScene->setSceneRect(QRect(0, 0, 500, 500)); |
| |
| connect(diagramScene, &DiagramScene::itemMoved, |
| this, &MainWindow::itemMoved); |
| |
| setWindowTitle("Undo Framework"); |
| QGraphicsView *view = new QGraphicsView(diagramScene); |
| setCentralWidget(view); |
| resize(700, 500); |
| } |
| //! [0] |
| |
| //! [1] |
| void MainWindow::createUndoView() |
| { |
| undoView = new QUndoView(undoStack); |
| undoView->setWindowTitle(tr("Command List")); |
| undoView->show(); |
| undoView->setAttribute(Qt::WA_QuitOnClose, false); |
| } |
| //! [1] |
| |
| //! [2] |
| void MainWindow::createActions() |
| { |
| deleteAction = new QAction(tr("&Delete Item"), this); |
| deleteAction->setShortcut(tr("Del")); |
| connect(deleteAction, &QAction::triggered, this, &MainWindow::deleteItem); |
| //! [2] //! [3] |
| |
| //! [3] //! [4] |
| addBoxAction = new QAction(tr("Add &Box"), this); |
| //! [4] |
| addBoxAction->setShortcut(tr("Ctrl+O")); |
| connect(addBoxAction, &QAction::triggered, this, &MainWindow::addBox); |
| |
| addTriangleAction = new QAction(tr("Add &Triangle"), this); |
| addTriangleAction->setShortcut(tr("Ctrl+T")); |
| connect(addTriangleAction, &QAction::triggered, this, &MainWindow::addTriangle); |
| |
| //! [5] |
| undoAction = undoStack->createUndoAction(this, tr("&Undo")); |
| undoAction->setShortcuts(QKeySequence::Undo); |
| |
| redoAction = undoStack->createRedoAction(this, tr("&Redo")); |
| redoAction->setShortcuts(QKeySequence::Redo); |
| //! [5] |
| |
| exitAction = new QAction(tr("E&xit"), this); |
| exitAction->setShortcuts(QKeySequence::Quit); |
| connect(exitAction, &QAction::triggered, this, &QWidget::close); |
| |
| aboutAction = new QAction(tr("&About"), this); |
| QList<QKeySequence> aboutShortcuts; |
| aboutShortcuts << tr("Ctrl+A") << tr("Ctrl+B"); |
| aboutAction->setShortcuts(aboutShortcuts); |
| connect(aboutAction, &QAction::triggered, this, &MainWindow::about); |
| } |
| |
| //! [6] |
| void MainWindow::createMenus() |
| { |
| //! [6] |
| fileMenu = menuBar()->addMenu(tr("&File")); |
| fileMenu->addAction(exitAction); |
| |
| //! [7] |
| editMenu = menuBar()->addMenu(tr("&Edit")); |
| editMenu->addAction(undoAction); |
| editMenu->addAction(redoAction); |
| editMenu->addSeparator(); |
| editMenu->addAction(deleteAction); |
| connect(editMenu, &QMenu::aboutToShow, |
| this, &MainWindow::itemMenuAboutToShow); |
| connect(editMenu, &QMenu::aboutToHide, |
| this, &MainWindow::itemMenuAboutToHide); |
| |
| //! [7] |
| itemMenu = menuBar()->addMenu(tr("&Item")); |
| itemMenu->addAction(addBoxAction); |
| itemMenu->addAction(addTriangleAction); |
| |
| helpMenu = menuBar()->addMenu(tr("&About")); |
| helpMenu->addAction(aboutAction); |
| //! [8] |
| } |
| //! [8] |
| |
| //! [9] |
| void MainWindow::itemMoved(DiagramItem *movedItem, |
| const QPointF &oldPosition) |
| { |
| undoStack->push(new MoveCommand(movedItem, oldPosition)); |
| } |
| //! [9] |
| |
| //! [10] |
| void MainWindow::deleteItem() |
| { |
| if (diagramScene->selectedItems().isEmpty()) |
| return; |
| |
| QUndoCommand *deleteCommand = new DeleteCommand(diagramScene); |
| undoStack->push(deleteCommand); |
| } |
| //! [10] |
| |
| //! [11] |
| void MainWindow::itemMenuAboutToHide() |
| { |
| deleteAction->setEnabled(true); |
| } |
| //! [11] |
| |
| //! [12] |
| void MainWindow::itemMenuAboutToShow() |
| { |
| deleteAction->setEnabled(!diagramScene->selectedItems().isEmpty()); |
| } |
| //! [12] |
| |
| //! [13] |
| void MainWindow::addBox() |
| { |
| QUndoCommand *addCommand = new AddCommand(DiagramItem::Box, diagramScene); |
| undoStack->push(addCommand); |
| } |
| //! [13] |
| |
| //! [14] |
| void MainWindow::addTriangle() |
| { |
| QUndoCommand *addCommand = new AddCommand(DiagramItem::Triangle, |
| diagramScene); |
| undoStack->push(addCommand); |
| } |
| //! [14] |
| |
| //! [15] |
| void MainWindow::about() |
| { |
| QMessageBox::about(this, tr("About Undo"), |
| tr("The <b>Undo</b> example demonstrates how to " |
| "use Qt's undo framework.")); |
| } |
| //! [15] |