qt5base-lts/examples/widgets/tools/undo/mainwindow.cpp

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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** $QT_END_LICENSE$
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****************************************************************************/
#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"));
}