Initial import from the monolithic Qt.

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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 446 insertions, 0 deletions

diff --git a/demos/undo/mainwindow.cpp b/demos/undo/mainwindow.cpp
new file mode 100644
index 0000000000..3dca63143f
--- /dev/null
+++ b/demos/undo/mainwindow.cpp
@@ -0,0 +1,446 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QUndoGroup>
+#include <QUndoStack>
+#include <QFileDialog>
+#include <QMessageBox>
+#include <QTextStream>
+#include <QToolButton>
+#include "document.h"
+#include "mainwindow.h"
+#include "commands.h"
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+{
+    setupUi(this);
+
+    QWidget *w = documentTabs->widget(0);
+    documentTabs->removeTab(0);
+    delete w;
+
+    connect(actionOpen, SIGNAL(triggered()), this, SLOT(openDocument()));
+    connect(actionClose, SIGNAL(triggered()), this, SLOT(closeDocument()));
+    connect(actionNew, SIGNAL(triggered()), this, SLOT(newDocument()));
+    connect(actionSave, SIGNAL(triggered()), this, SLOT(saveDocument()));
+    connect(actionExit, SIGNAL(triggered()), this, SLOT(close()));
+    connect(actionRed, SIGNAL(triggered()), this, SLOT(setShapeColor()));
+    connect(actionGreen, SIGNAL(triggered()), this, SLOT(setShapeColor()));
+    connect(actionBlue, SIGNAL(triggered()), this, SLOT(setShapeColor()));
+    connect(actionAddCircle, SIGNAL(triggered()), this, SLOT(addShape()));
+    connect(actionAddRectangle, SIGNAL(triggered()), this, SLOT(addShape()));
+    connect(actionAddTriangle, SIGNAL(triggered()), this, SLOT(addShape()));
+    connect(actionRemoveShape, SIGNAL(triggered()), this, SLOT(removeShape()));
+    connect(actionAddRobot, SIGNAL(triggered()), this, SLOT(addRobot()));
+    connect(actionAddSnowman, SIGNAL(triggered()), this, SLOT(addSnowman()));
+    connect(actionAbout, SIGNAL(triggered()), this, SLOT(about()));
+    connect(actionAboutQt, SIGNAL(triggered()), this, SLOT(aboutQt()));
+
+    connect(undoLimit, SIGNAL(valueChanged(int)), this, SLOT(updateActions()));
+    connect(documentTabs, SIGNAL(currentChanged(int)), this, SLOT(updateActions()));
+
+    actionOpen->setShortcut(QString("Ctrl+O"));
+    actionClose->setShortcut(QString("Ctrl+W"));
+    actionNew->setShortcut(QString("Ctrl+N"));
+    actionSave->setShortcut(QString("Ctrl+S"));
+    actionExit->setShortcut(QString("Ctrl+Q"));
+    actionRemoveShape->setShortcut(QString("Del"));
+    actionRed->setShortcut(QString("Alt+R"));
+    actionGreen->setShortcut(QString("Alt+G"));
+    actionBlue->setShortcut(QString("Alt+B"));
+    actionAddCircle->setShortcut(QString("Alt+C"));
+    actionAddRectangle->setShortcut(QString("Alt+L"));
+    actionAddTriangle->setShortcut(QString("Alt+T"));
+
+    m_undoGroup = new QUndoGroup(this);
+    undoView->setGroup(m_undoGroup);
+    undoView->setCleanIcon(QIcon(":/icons/ok.png"));
+
+    QAction *undoAction = m_undoGroup->createUndoAction(this);
+    QAction *redoAction = m_undoGroup->createRedoAction(this);
+    undoAction->setIcon(QIcon(":/icons/undo.png"));
+    redoAction->setIcon(QIcon(":/icons/redo.png"));
+    menuShape->insertAction(menuShape->actions().at(0), undoAction);
+    menuShape->insertAction(undoAction, redoAction);
+
+    toolBar->addAction(undoAction);
+    toolBar->addAction(redoAction);
+
+    newDocument();
+    updateActions();
+};
+
+void MainWindow::updateActions()
+{
+    Document *doc = currentDocument();
+    m_undoGroup->setActiveStack(doc == 0 ? 0 : doc->undoStack());
+    QString shapeName = doc == 0 ? QString() : doc->currentShapeName();
+
+    actionAddRobot->setEnabled(doc != 0);
+    actionAddSnowman->setEnabled(doc != 0);
+    actionAddCircle->setEnabled(doc != 0);
+    actionAddRectangle->setEnabled(doc != 0);
+    actionAddTriangle->setEnabled(doc != 0);
+    actionClose->setEnabled(doc != 0);
+    actionSave->setEnabled(doc != 0 && !doc->undoStack()->isClean());
+    undoLimit->setEnabled(doc != 0 && doc->undoStack()->count() == 0);
+
+    if (shapeName.isEmpty()) {
+        actionRed->setEnabled(false);
+        actionGreen->setEnabled(false);
+        actionBlue->setEnabled(false);
+        actionRemoveShape->setEnabled(false);
+    } else {
+        Shape shape = doc->shape(shapeName);
+        actionRed->setEnabled(shape.color() != Qt::red);
+        actionGreen->setEnabled(shape.color() != Qt::green);
+        actionBlue->setEnabled(shape.color() != Qt::blue);
+        actionRemoveShape->setEnabled(true);
+    }
+
+    if (doc != 0) {
+        int index = documentTabs->indexOf(doc);
+        Q_ASSERT(index != -1);
+        static const QIcon unsavedIcon(":/icons/filesave.png");
+        documentTabs->setTabIcon(index, doc->undoStack()->isClean() ? QIcon() : unsavedIcon);
+
+        if (doc->undoStack()->count() == 0)
+            doc->undoStack()->setUndoLimit(undoLimit->value());
+    }
+}
+
+void MainWindow::openDocument()
+{
+    QString fileName = QFileDialog::getOpenFileName(this);
+    if (fileName.isEmpty())
+        return;
+
+    QFile file(fileName);
+    if (!file.open(QIODevice::ReadOnly)) {
+        QMessageBox::warning(this,
+                            tr("File error"),
+                            tr("Failed to open\n%1").arg(fileName));
+        return;
+    }
+    QTextStream stream(&file);
+
+    Document *doc = new Document();
+    if (!doc->load(stream)) {
+        QMessageBox::warning(this,
+                            tr("Parse error"),
+                            tr("Failed to parse\n%1").arg(fileName));
+        delete doc;
+        return;
+    }
+
+    doc->setFileName(fileName);
+    addDocument(doc);
+}
+
+QString MainWindow::fixedWindowTitle(const Document *doc) const
+{
+    QString title = doc->fileName();
+
+    if (title.isEmpty())
+        title = tr("Unnamed");
+    else
+        title = QFileInfo(title).fileName();
+
+    QString result;
+
+    for (int i = 0; ; ++i) {
+        result = title;
+        if (i > 0)
+            result += QString::number(i);
+
+        bool unique = true;
+        for (int j = 0; j < documentTabs->count(); ++j) {
+            const QWidget *widget = documentTabs->widget(j);
+            if (widget == doc)
+                continue;
+            if (result == documentTabs->tabText(j)) {
+                unique = false;
+                break;
+            }
+        }
+
+        if (unique)
+            break;
+    }
+
+    return result;
+}
+
+void MainWindow::addDocument(Document *doc)
+{
+    if (documentTabs->indexOf(doc) != -1)
+        return;
+    m_undoGroup->addStack(doc->undoStack());
+    documentTabs->addTab(doc, fixedWindowTitle(doc));
+    connect(doc, SIGNAL(currentShapeChanged(QString)), this, SLOT(updateActions()));
+    connect(doc->undoStack(), SIGNAL(indexChanged(int)), this, SLOT(updateActions()));
+    connect(doc->undoStack(), SIGNAL(cleanChanged(bool)), this, SLOT(updateActions()));
+
+    setCurrentDocument(doc);
+}
+
+void MainWindow::setCurrentDocument(Document *doc)
+{
+    documentTabs->setCurrentWidget(doc);
+}
+
+Document *MainWindow::currentDocument() const
+{
+    return qobject_cast<Document*>(documentTabs->currentWidget());
+}
+
+void MainWindow::removeDocument(Document *doc)
+{
+    int index = documentTabs->indexOf(doc);
+    if (index == -1)
+        return;
+
+    documentTabs->removeTab(index);
+    m_undoGroup->removeStack(doc->undoStack());
+    disconnect(doc, SIGNAL(currentShapeChanged(QString)), this, SLOT(updateActions()));
+    disconnect(doc->undoStack(), SIGNAL(indexChanged(int)), this, SLOT(updateActions()));
+    disconnect(doc->undoStack(), SIGNAL(cleanChanged(bool)), this, SLOT(updateActions()));
+
+    if (documentTabs->count() == 0) {
+        newDocument();
+        updateActions();
+    }
+}
+
+void MainWindow::saveDocument()
+{
+    Document *doc = currentDocument();
+    if (doc == 0)
+        return;
+
+    for (;;) {
+        QString fileName = doc->fileName();
+
+        if (fileName.isEmpty())
+            fileName = QFileDialog::getSaveFileName(this);
+        if (fileName.isEmpty())
+            break;
+
+        QFile file(fileName);
+        if (!file.open(QIODevice::WriteOnly)) {
+            QMessageBox::warning(this,
+                                tr("File error"),
+                                tr("Failed to open\n%1").arg(fileName));
+            doc->setFileName(QString());
+        } else {
+            QTextStream stream(&file);
+            doc->save(stream);
+            doc->setFileName(fileName);
+
+            int index = documentTabs->indexOf(doc);
+            Q_ASSERT(index != -1);
+            documentTabs->setTabText(index, fixedWindowTitle(doc));
+
+            break;
+        }
+    }
+}
+
+void MainWindow::closeDocument()
+{
+    Document *doc = currentDocument();
+    if (doc == 0)
+        return;
+
+    if (!doc->undoStack()->isClean()) {
+        int button
+            = QMessageBox::warning(this,
+                            tr("Unsaved changes"),
+                            tr("Would you like to save this document?"),
+                            QMessageBox::Yes, QMessageBox::No);
+        if (button == QMessageBox::Yes)
+            saveDocument();
+    }
+
+    removeDocument(doc);
+    delete doc;
+}
+
+void MainWindow::newDocument()
+{
+    addDocument(new Document());
+}
+
+static QColor randomColor()
+{
+    int r = (int) (3.0*(rand()/(RAND_MAX + 1.0)));
+    switch (r) {
+        case 0:
+            return Qt::red;
+        case 1:
+            return Qt::green;
+        default:
+            break;
+    }
+    return Qt::blue;
+}
+
+static QRect randomRect(const QSize &s)
+{
+    QSize min = Shape::minSize;
+
+    int left = (int) ((0.0 + s.width() - min.width())*(rand()/(RAND_MAX + 1.0)));
+    int top = (int) ((0.0 + s.height() - min.height())*(rand()/(RAND_MAX + 1.0)));
+    int width = (int) ((0.0 + s.width() - left - min.width())*(rand()/(RAND_MAX + 1.0))) + min.width();
+    int height = (int) ((0.0 + s.height() - top - min.height())*(rand()/(RAND_MAX + 1.0))) + min.height();
+
+    return QRect(left, top, width, height);
+}
+
+void MainWindow::addShape()
+{
+    Document *doc = currentDocument();
+    if (doc == 0)
+        return;
+
+    Shape::Type type;
+
+    if (sender() == actionAddCircle)
+        type = Shape::Circle;
+    else if (sender() == actionAddRectangle)
+        type = Shape::Rectangle;
+    else if (sender() == actionAddTriangle)
+        type = Shape::Triangle;
+    else return;
+
+    Shape newShape(type, randomColor(), randomRect(doc->size()));
+    doc->undoStack()->push(new AddShapeCommand(doc, newShape));
+}
+
+void MainWindow::removeShape()
+{
+    Document *doc = currentDocument();
+    if (doc == 0)
+        return;
+
+    QString shapeName = doc->currentShapeName();
+    if (shapeName.isEmpty())
+        return;
+
+    doc->undoStack()->push(new RemoveShapeCommand(doc, shapeName));
+}
+
+void MainWindow::setShapeColor()
+{
+    Document *doc = currentDocument();
+    if (doc == 0)
+        return;
+
+    QString shapeName = doc->currentShapeName();
+    if (shapeName.isEmpty())
+        return;
+
+    QColor color;
+
+    if (sender() == actionRed)
+        color = Qt::red;
+    else if (sender() == actionGreen)
+        color = Qt::green;
+    else if (sender() == actionBlue)
+        color = Qt::blue;
+    else
+        return;
+
+    if (color == doc->shape(shapeName).color())
+        return;
+
+    doc->undoStack()->push(new SetShapeColorCommand(doc, shapeName, color));
+}
+
+void MainWindow::addSnowman()
+{
+    Document *doc = currentDocument();
+    if (doc == 0)
+        return;
+
+    // Create a macro command using beginMacro() and endMacro()
+
+    doc->undoStack()->beginMacro(tr("Add snowman"));
+    doc->undoStack()->push(new AddShapeCommand(doc,
+                            Shape(Shape::Circle, Qt::blue, QRect(51, 30, 97, 95))));
+    doc->undoStack()->push(new AddShapeCommand(doc,
+                            Shape(Shape::Circle, Qt::blue, QRect(27, 123, 150, 133))));
+    doc->undoStack()->push(new AddShapeCommand(doc,
+                            Shape(Shape::Circle, Qt::blue, QRect(11, 253, 188, 146))));
+    doc->undoStack()->endMacro();
+}
+
+void MainWindow::addRobot()
+{
+    Document *doc = currentDocument();
+    if (doc == 0)
+        return;
+
+    // Compose a macro command by explicitly adding children to a parent command
+
+    QUndoCommand *parent = new QUndoCommand(tr("Add robot"));
+
+    new AddShapeCommand(doc, Shape(Shape::Rectangle, Qt::green, QRect(115, 15, 81, 70)), parent);
+    new AddShapeCommand(doc, Shape(Shape::Rectangle, Qt::green, QRect(82, 89, 148, 188)), parent);
+    new AddShapeCommand(doc, Shape(Shape::Rectangle, Qt::green, QRect(76, 280, 80, 165)), parent);
+    new AddShapeCommand(doc, Shape(Shape::Rectangle, Qt::green, QRect(163, 280, 80, 164)), parent);
+    new AddShapeCommand(doc, Shape(Shape::Circle, Qt::blue, QRect(116, 25, 80, 50)), parent);
+    new AddShapeCommand(doc, Shape(Shape::Rectangle, Qt::green, QRect(232, 92, 80, 127)), parent);
+    new AddShapeCommand(doc, Shape(Shape::Rectangle, Qt::green, QRect(2, 92, 80, 125)), parent);
+
+    doc->undoStack()->push(parent);
+}
+
+void MainWindow::about()
+{
+    QMessageBox::about(this, tr("About Undo"), tr("The Undo demonstration shows how to use the Qt Undo framework."));
+}
+
+void MainWindow::aboutQt()
+{
+    QMessageBox::aboutQt(this, tr("About Qt"));
+}