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#include <QtGui>

#include "mainwindow.h"

#include "diagramscene.h"

#include "diagramitem.h"

#include "commands.h"

//! [0]

MainWindow::MainWindow()

{

    undoStack = new QUndoStack();

    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, SIGNAL(itemMoved(DiagramItem*,QPointF)),

            this, SLOT(itemMoved(DiagramItem*,QPointF)));

    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, SIGNAL(triggered()), this, SLOT(deleteItem()));

//! [2] //! [3]

//! [3] //! [4]

    addBoxAction = new QAction(tr("Add &Box"), this);

//! [4]

    addBoxAction->setShortcut(tr("Ctrl+O"));

    connect(addBoxAction, SIGNAL(triggered()), this, SLOT(addBox()));

    addTriangleAction = new QAction(tr("Add &Triangle"), this);

    addTriangleAction->setShortcut(tr("Ctrl+T"));

    connect(addTriangleAction, SIGNAL(triggered()), this, SLOT(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, SIGNAL(triggered()), this, SLOT(close()));

    aboutAction = new QAction(tr("&About"), this);

    QList<QKeySequence> aboutShortcuts;

    aboutShortcuts << tr("Ctrl+A") << tr("Ctrl+B");

    aboutAction->setShortcuts(aboutShortcuts);

    connect(aboutAction, SIGNAL(triggered()), this, SLOT(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, SIGNAL(aboutToShow()),

            this, SLOT(itemMenuAboutToShow()));

    connect(editMenu, SIGNAL(aboutToHide()),

            this, SLOT(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]