Merge "undo" and "undoframework" examples

The "undo" example didn't show anything that the "undoframework"
example doesn't, and the latter is more comprehensive and properly
documented. "undoframework" also uses QGraphicsView instead of
inventing its own diagram widget.

However, the "undo" example created a nicer UI with toolbuttons,
icons, and the undo view in a dock widget, so reuse those elements
in the "undoframework" example instead.

Update the documentation quoting tags accordingly, and clean up
a bit.

Pick-to: 6.5
Change-Id: I3c91feecbd5fe3e5900838b0b51f9fe7bd190280
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>
This commit is contained in:
Volker Hilsheimer 2023-01-09 13:55:09 +01:00 committed by Jan Arve Sæther
parent 26f8ea1224
commit cb0bf5ad68
37 changed files with 85 additions and 1691 deletions

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\example tools/undo
\title Undo Framework
\ingroup examples-widgets-tools
\brief This example shows Qt's undo framework in action.
\image undodemo.png
Qt's undo framework is an implementation of the Command
pattern, which provides advanced undo/redo functionality.
To show the abilities of the framework, we have implemented a
small diagram application in which the diagram items are geometric
primitives. You can edit the diagram in the following ways: add,
move, change the color of, and delete the items.
*/

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@ -69,6 +69,9 @@
\snippet tools/undoframework/mainwindow.cpp 0
In the constructor, we set up the DiagramScene and QGraphicsView.
We only want \c deleteAction to be enabled when we have selected an
item, so we connect to the \c selectionChanged() signal of the scene
to \c updateActions() slot.
Here is the \c createUndoView() function:
@ -76,13 +79,11 @@
The QUndoView is a widget that display the text, which is set with
the \l{QUndoCommand::}{setText()} function, for each QUndoCommand
in the undo stack in a list.
in the undo stack in a list. We put it into a docking widget.
Here is the \c createActions() function:
\snippet tools/undoframework/mainwindow.cpp 2
\codeline
\snippet tools/undoframework/mainwindow.cpp 3
\dots
\snippet tools/undoframework/mainwindow.cpp 5
@ -95,46 +96,38 @@
\l{QUndoCommand::}{text()} of the undo commands. For the other
actions we have implemented slots in the \c MainWindow class.
Here is the \c createMenus() function:
\dots
\snippet tools/undoframework/mainwindow.cpp 6
\dots
Once all actions are created we update their state by calling the
same function that is connected to the \c selectionChanged signal of
the scene.
The \c createMenus() and \c createToolBars() functions add the
actions to menus and toolbars:
\snippet tools/undoframework/mainwindow.cpp 7
\dots
\snippet tools/undoframework/mainwindow.cpp 8
We have to use the QMenu \c aboutToShow() and \c aboutToHide()
signals since we only want \c deleteAction to be enabled when we
have selected an item.
\dots
\snippet tools/undoframework/mainwindow.cpp 9
Here is the \c itemMoved() slot:
\snippet tools/undoframework/mainwindow.cpp 9
\snippet tools/undoframework/mainwindow.cpp 11
We simply push a MoveCommand on the stack, which calls \c redo()
on it.
Here is the \c deleteItem() slot:
\snippet tools/undoframework/mainwindow.cpp 10
\snippet tools/undoframework/mainwindow.cpp 12
An item must be selected to be deleted. We need to check if it is
An item must be selected to be deleted. We need to check if it is
selected as the \c deleteAction may be enabled even if an item is
not selected. This can happen as we do not catch a signal or event
when an item is selected.
Here is the \c itemMenuAboutToShow() and itemMenuAboutToHide() slots:
\snippet tools/undoframework/mainwindow.cpp 11
\codeline
\snippet tools/undoframework/mainwindow.cpp 12
We implement \c itemMenuAboutToShow() and \c itemMenuAboutToHide()
to get a dynamic item menu. These slots are connected to the
\l{QMenu::}{aboutToShow()} and \l{QMenu::}{aboutToHide()} signals.
We need this to disable or enable the \c deleteAction.
Here is the \c addBox() slot:
\snippet tools/undoframework/mainwindow.cpp 13

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@ -7,7 +7,6 @@ qt_internal_add_example(regularexpression)
qt_internal_add_example(settingseditor)
qt_internal_add_example(styleplugin)
qt_internal_add_example(treemodelcompleter)
qt_internal_add_example(undo)
qt_internal_add_example(undoframework)
if(QT_FEATURE_library)

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@ -8,7 +8,6 @@ SUBDIRS = \
settingseditor \
styleplugin \
treemodelcompleter \
undo \
undoframework
!qtConfig(library) {

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@ -1,68 +0,0 @@
# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: BSD-3-Clause
cmake_minimum_required(VERSION 3.16)
project(undo LANGUAGES CXX)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
if(NOT DEFINED INSTALL_EXAMPLESDIR)
set(INSTALL_EXAMPLESDIR "examples")
endif()
set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/widgets/tools/undo")
find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
qt_standard_project_setup()
qt_add_executable(undo
commands.cpp commands.h
document.cpp document.h
main.cpp
mainwindow.cpp mainwindow.h mainwindow.ui
)
set_target_properties(undo PROPERTIES
WIN32_EXECUTABLE TRUE
MACOSX_BUNDLE TRUE
)
target_link_libraries(undo PRIVATE
Qt6::Core
Qt6::Gui
Qt6::Widgets
)
# Resources:
set(undo_resource_files
"icons/background.png"
"icons/blue.png"
"icons/circle.png"
"icons/exit.png"
"icons/fileclose.png"
"icons/filenew.png"
"icons/fileopen.png"
"icons/filesave.png"
"icons/green.png"
"icons/ok.png"
"icons/rectangle.png"
"icons/red.png"
"icons/redo.png"
"icons/remove.png"
"icons/triangle.png"
"icons/undo.png"
)
qt_add_resources(undo "undo"
PREFIX
"/"
FILES
${undo_resource_files}
)
install(TARGETS undo
RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
)

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@ -1,130 +0,0 @@
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "commands.h"
static constexpr int setShapeRectCommandId = 1;
static constexpr int setShapeColorCommandId = 2;
/******************************************************************************
** AddShapeCommand
*/
AddShapeCommand::AddShapeCommand(Document *doc, const Shape &shape, QUndoCommand *parent)
: QUndoCommand(parent), m_doc(doc), m_shape(shape)
{
}
void AddShapeCommand::undo()
{
m_doc->deleteShape(m_shapeName);
}
void AddShapeCommand::redo()
{
// A shape only gets a name when it is inserted into a document
m_shapeName = m_doc->addShape(m_shape);
setText(QObject::tr("Add %1").arg(m_shapeName));
}
/******************************************************************************
** RemoveShapeCommand
*/
RemoveShapeCommand::RemoveShapeCommand(Document *doc, const QString &shapeName,
QUndoCommand *parent)
: QUndoCommand(parent), m_doc(doc), m_shape(doc->shape(shapeName))
, m_shapeName(shapeName)
{
setText(QObject::tr("Remove %1").arg(shapeName));
}
void RemoveShapeCommand::undo()
{
m_shapeName = m_doc->addShape(m_shape);
}
void RemoveShapeCommand::redo()
{
m_doc->deleteShape(m_shapeName);
}
/******************************************************************************
** SetShapeColorCommand
*/
SetShapeColorCommand::SetShapeColorCommand(Document *doc, const QString &shapeName,
const QColor &color, QUndoCommand *parent)
: QUndoCommand(parent), m_doc(doc), m_shapeName(shapeName)
, m_oldColor(doc->shape(shapeName).color()), m_newColor(color)
{
setText(QObject::tr("Set %1's color").arg(shapeName));
}
void SetShapeColorCommand::undo()
{
m_doc->setShapeColor(m_shapeName, m_oldColor);
}
void SetShapeColorCommand::redo()
{
m_doc->setShapeColor(m_shapeName, m_newColor);
}
bool SetShapeColorCommand::mergeWith(const QUndoCommand *command)
{
if (command->id() != setShapeColorCommandId)
return false;
const SetShapeColorCommand *other = static_cast<const SetShapeColorCommand*>(command);
if (m_shapeName != other->m_shapeName)
return false;
m_newColor = other->m_newColor;
return true;
}
int SetShapeColorCommand::id() const
{
return setShapeColorCommandId;
}
/******************************************************************************
** SetShapeRectCommand
*/
SetShapeRectCommand::SetShapeRectCommand(Document *doc, const QString &shapeName,
const QRect &rect, QUndoCommand *parent)
: QUndoCommand(parent), m_doc(doc), m_shapeName(shapeName)
, m_oldRect(doc->shape(shapeName).rect()), m_newRect(rect)
{
setText(QObject::tr("Change %1's geometry").arg(shapeName));
}
void SetShapeRectCommand::undo()
{
m_doc->setShapeRect(m_shapeName, m_oldRect);
}
void SetShapeRectCommand::redo()
{
m_doc->setShapeRect(m_shapeName, m_newRect);
}
bool SetShapeRectCommand::mergeWith(const QUndoCommand *command)
{
if (command->id() != setShapeRectCommandId)
return false;
const SetShapeRectCommand *other = static_cast<const SetShapeRectCommand*>(command);
if (m_shapeName != other->m_shapeName)
return false;
m_newRect = other->m_newRect;
return true;
}
int SetShapeRectCommand::id() const
{
return setShapeRectCommandId;
}

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@ -1,76 +0,0 @@
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#ifndef COMMANDS_H
#define COMMANDS_H
#include <QUndoCommand>
#include "document.h"
class AddShapeCommand : public QUndoCommand
{
public:
AddShapeCommand(Document *doc, const Shape &shape,
QUndoCommand *parent = nullptr);
void undo() override;
void redo() override;
private:
Document *m_doc;
Shape m_shape;
QString m_shapeName;
};
class RemoveShapeCommand : public QUndoCommand
{
public:
RemoveShapeCommand(Document *doc, const QString &shapeName,
QUndoCommand *parent = nullptr);
void undo() override;
void redo() override;
private:
Document *m_doc;
Shape m_shape;
QString m_shapeName;
};
class SetShapeColorCommand : public QUndoCommand
{
public:
SetShapeColorCommand(Document *doc, const QString &shapeName,
const QColor &color, QUndoCommand *parent = nullptr);
void undo() override;
void redo() override;
bool mergeWith(const QUndoCommand *command) override;
int id() const override;
private:
Document *m_doc;
QString m_shapeName;
QColor m_oldColor;
QColor m_newColor;
};
class SetShapeRectCommand : public QUndoCommand
{
public:
SetShapeRectCommand(Document *doc, const QString &shapeName,
const QRect &rect, QUndoCommand *parent = nullptr);
void undo() override;
void redo() override;
bool mergeWith(const QUndoCommand *command) override;
int id() const override;
private:
Document *m_doc;
QString m_shapeName;
QRect m_oldRect;
QRect m_newRect;
};
#endif // COMMANDS_H

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@ -1,401 +0,0 @@
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "document.h"
#include "commands.h"
#include <QPainter>
#include <QPaintEvent>
#include <QTextStream>
#include <QUndoStack>
static constexpr int resizeHandleWidth = 6;
/******************************************************************************
** Shape
*/
const QSize Shape::minSize(80, 50);
Shape::Shape(Type type, const QColor &color, const QRect &rect)
: m_type(type), m_rect(rect), m_color(color)
{
}
Shape::Type Shape::type() const
{
return m_type;
}
QRect Shape::rect() const
{
return m_rect;
}
QColor Shape::color() const
{
return m_color;
}
QString Shape::name() const
{
return m_name;
}
QRect Shape::resizeHandle() const
{
QPoint br = m_rect.bottomRight();
return QRect(br - QPoint(resizeHandleWidth, resizeHandleWidth), br);
}
QString Shape::typeToString(Type type)
{
switch (type) {
case Rectangle:
return QLatin1String("Rectangle");
case Circle:
return QLatin1String("Circle");
case Triangle:
return QLatin1String("Triangle");
}
return QString();
}
Shape::Type Shape::stringToType(const QString &s, bool *ok)
{
if (ok != nullptr)
*ok = true;
if (s == QLatin1String("Rectangle"))
return Rectangle;
if (s == QLatin1String("Circle"))
return Circle;
if (s == QLatin1String("Triangle"))
return Triangle;
if (ok != nullptr)
*ok = false;
return Rectangle;
}
/******************************************************************************
** Document
*/
Document::Document(QWidget *parent)
: QWidget(parent), m_undoStack(new QUndoStack(this))
{
setAutoFillBackground(true);
setBackgroundRole(QPalette::Base);
QPalette pal = palette();
pal.setBrush(QPalette::Base, QPixmap(":/icons/background.png"));
pal.setColor(QPalette::HighlightedText, Qt::red);
setPalette(pal);
}
QString Document::addShape(const Shape &shape)
{
QString name = Shape::typeToString(shape.type());
name = uniqueName(name);
m_shapeList.append(shape);
m_shapeList[m_shapeList.count() - 1].m_name = name;
setCurrentShape(m_shapeList.count() - 1);
return name;
}
void Document::deleteShape(const QString &shapeName)
{
int index = indexOf(shapeName);
if (index == -1)
return;
update(m_shapeList.at(index).rect());
m_shapeList.removeAt(index);
if (index <= m_currentIndex) {
m_currentIndex = -1;
if (index == m_shapeList.count())
--index;
setCurrentShape(index);
}
}
Shape Document::shape(const QString &shapeName) const
{
int index = indexOf(shapeName);
if (index == -1)
return Shape();
return m_shapeList.at(index);
}
void Document::setShapeRect(const QString &shapeName, const QRect &rect)
{
int index = indexOf(shapeName);
if (index == -1)
return;
Shape &shape = m_shapeList[index];
update(shape.rect());
update(rect);
shape.m_rect = rect;
}
void Document::setShapeColor(const QString &shapeName, const QColor &color)
{
int index = indexOf(shapeName);
if (index == -1)
return;
Shape &shape = m_shapeList[index];
shape.m_color = color;
update(shape.rect());
}
QUndoStack *Document::undoStack() const
{
return m_undoStack;
}
bool Document::load(QTextStream &stream)
{
m_shapeList.clear();
while (!stream.atEnd()) {
QString shapeType, shapeName, colorName;
int left, top, width, height;
stream >> shapeType >> shapeName >> colorName >> left >> top >> width >> height;
if (stream.status() != QTextStream::Ok)
return false;
bool ok;
Shape::Type type = Shape::stringToType(shapeType, &ok);
if (!ok)
return false;
QColor color(colorName);
if (!color.isValid())
return false;
Shape shape(type);
shape.m_name = shapeName;
shape.m_color = color;
shape.m_rect = QRect(left, top, width, height);
m_shapeList.append(shape);
}
m_currentIndex = m_shapeList.isEmpty() ? -1 : 0;
return true;
}
void Document::save(QTextStream &stream)
{
for (int i = 0; i < m_shapeList.count(); ++i) {
const Shape &shape = m_shapeList.at(i);
QRect r = shape.rect();
stream << Shape::typeToString(shape.type()) << QLatin1Char(' ')
<< shape.name() << QLatin1Char(' ')
<< shape.color().name() << QLatin1Char(' ')
<< r.left() << QLatin1Char(' ')
<< r.top() << QLatin1Char(' ')
<< r.width() << QLatin1Char(' ')
<< r.height();
if (i != m_shapeList.count() - 1)
stream << QLatin1Char('\n');
}
m_undoStack->setClean();
}
QString Document::fileName() const
{
return m_fileName;
}
void Document::setFileName(const QString &fileName)
{
m_fileName = fileName;
}
int Document::indexAt(const QPoint &pos) const
{
for (int i = m_shapeList.count() - 1; i >= 0; --i) {
if (m_shapeList.at(i).rect().contains(pos))
return i;
}
return -1;
}
void Document::mousePressEvent(QMouseEvent *event)
{
event->accept();
int index = indexAt(event->position().toPoint());;
if (index != -1) {
setCurrentShape(index);
const Shape &shape = m_shapeList.at(index);
m_resizeHandlePressed = shape.resizeHandle().contains(event->position().toPoint());
if (m_resizeHandlePressed)
m_mousePressOffset = shape.rect().bottomRight() - event->position().toPoint();
else
m_mousePressOffset = event->position().toPoint() - shape.rect().topLeft();
}
m_mousePressIndex = index;
}
void Document::mouseReleaseEvent(QMouseEvent *event)
{
event->accept();
m_mousePressIndex = -1;
}
void Document::mouseMoveEvent(QMouseEvent *event)
{
event->accept();
if (m_mousePressIndex == -1)
return;
const Shape &shape = m_shapeList.at(m_mousePressIndex);
QRect rect;
if (m_resizeHandlePressed) {
rect = QRect(shape.rect().topLeft(), event->position().toPoint() + m_mousePressOffset);
} else {
rect = shape.rect();
rect.moveTopLeft(event->position().toPoint() - m_mousePressOffset);
}
QSize size = rect.size().expandedTo(Shape::minSize);
rect.setSize(size);
m_undoStack->push(new SetShapeRectCommand(this, shape.name(), rect));
}
static QGradient gradient(const QColor &color, const QRect &rect)
{
QColor c = color;
c.setAlpha(160);
QLinearGradient result(rect.topLeft(), rect.bottomRight());
result.setColorAt(0, c.darker(150));
result.setColorAt(0.5, c.lighter(200));
result.setColorAt(1, c.darker(150));
return result;
}
static QPolygon triangle(const QRect &rect)
{
QPolygon result(3);
result.setPoint(0, rect.center().x(), rect.top());
result.setPoint(1, rect.right(), rect.bottom());
result.setPoint(2, rect.left(), rect.bottom());
return result;
}
void Document::paintEvent(QPaintEvent *event)
{
QRegion paintRegion = event->region();
QPainter painter(this);
QPalette pal = palette();
for (int i = 0; i < m_shapeList.count(); ++i) {
const Shape &shape = m_shapeList.at(i);
if (!paintRegion.contains(shape.rect()))
continue;
QPen pen = pal.text().color();
pen.setWidth(i == m_currentIndex ? 2 : 1);
painter.setPen(pen);
painter.setBrush(gradient(shape.color(), shape.rect()));
QRect rect = shape.rect();
rect.adjust(1, 1, -resizeHandleWidth/2, -resizeHandleWidth/2);
// paint the shape
switch (shape.type()) {
case Shape::Rectangle:
painter.drawRect(rect);
break;
case Shape::Circle:
painter.setRenderHint(QPainter::Antialiasing);
painter.drawEllipse(rect);
painter.setRenderHint(QPainter::Antialiasing, false);
break;
case Shape::Triangle:
painter.setRenderHint(QPainter::Antialiasing);
painter.drawPolygon(triangle(rect));
painter.setRenderHint(QPainter::Antialiasing, false);
break;
}
// paint the resize handle
painter.setPen(pal.text().color());
painter.setBrush(Qt::white);
painter.drawRect(shape.resizeHandle().adjusted(0, 0, -1, -1));
// paint the shape name
painter.setBrush(pal.text());
if (shape.type() == Shape::Triangle)
rect.adjust(0, rect.height()/2, 0, 0);
painter.drawText(rect, Qt::AlignCenter, shape.name());
}
}
void Document::setCurrentShape(int index)
{
QString currentName;
if (m_currentIndex != -1)
update(m_shapeList.at(m_currentIndex).rect());
m_currentIndex = index;
if (m_currentIndex != -1) {
const Shape &current = m_shapeList.at(m_currentIndex);
update(current.rect());
currentName = current.name();
}
emit currentShapeChanged(currentName);
}
int Document::indexOf(const QString &shapeName) const
{
for (int i = 0; i < m_shapeList.count(); ++i) {
if (m_shapeList.at(i).name() == shapeName)
return i;
}
return -1;
}
QString Document::uniqueName(const QString &name) const
{
QString unique;
for (int i = 0; ; ++i) {
unique = name;
if (i > 0)
unique += QString::number(i);
if (indexOf(unique) == -1)
break;
}
return unique;
}
QString Document::currentShapeName() const
{
if (m_currentIndex == -1)
return QString();
return m_shapeList.at(m_currentIndex).name();
}

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@ -1,86 +0,0 @@
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#ifndef DOCUMENT_H
#define DOCUMENT_H
#include <QWidget>
QT_FORWARD_DECLARE_CLASS(QUndoStack)
QT_FORWARD_DECLARE_CLASS(QTextStream)
class Shape
{
public:
enum Type { Rectangle, Circle, Triangle };
explicit Shape(Type type = Rectangle, const QColor &color = Qt::red, const QRect &rect = QRect());
Type type() const;
QString name() const;
QRect rect() const;
QRect resizeHandle() const;
QColor color() const;
static QString typeToString(Type type);
static Type stringToType(const QString &s, bool *ok = nullptr);
static const QSize minSize;
private:
Type m_type;
QRect m_rect;
QColor m_color;
QString m_name;
friend class Document;
};
class Document : public QWidget
{
Q_OBJECT
public:
Document(QWidget *parent = nullptr);
QString addShape(const Shape &shape);
void deleteShape(const QString &shapeName);
Shape shape(const QString &shapeName) const;
QString currentShapeName() const;
void setShapeRect(const QString &shapeName, const QRect &rect);
void setShapeColor(const QString &shapeName, const QColor &color);
bool load(QTextStream &stream);
void save(QTextStream &stream);
QString fileName() const;
void setFileName(const QString &fileName);
QUndoStack *undoStack() const;
signals:
void currentShapeChanged(const QString &shapeName);
protected:
void paintEvent(QPaintEvent *event) override;
void mousePressEvent(QMouseEvent *event) override;
void mouseReleaseEvent(QMouseEvent *event) override;
void mouseMoveEvent(QMouseEvent *event) override;
private:
void setCurrentShape(int index);
int indexOf(const QString &shapeName) const;
int indexAt(const QPoint &pos) const;
QString uniqueName(const QString &name) const;
QList<Shape> m_shapeList;
QPoint m_mousePressOffset;
QString m_fileName;
QUndoStack *m_undoStack = nullptr;
int m_currentIndex = -1;
int m_mousePressIndex = -1;
bool m_resizeHandlePressed = false;
};
#endif // DOCUMENT_H

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QApplication>
#include "mainwindow.h"
int main(int argc, char **argv)
{
Q_INIT_RESOURCE(undo);
QApplication app(argc, argv);
MainWindow win;
win.resize(800, 600);
win.show();
return app.exec();
}

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@ -1,410 +0,0 @@
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "mainwindow.h"
#include "document.h"
#include "commands.h"
#include <QUndoGroup>
#include <QUndoStack>
#include <QFileDialog>
#include <QMessageBox>
#include <QRandomGenerator>
#include <QTextStream>
#include <QToolButton>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
setupUi(this);
QWidget *w = documentTabs->widget(0);
documentTabs->removeTab(0);
delete w;
connect(actionOpen, &QAction::triggered, this, &MainWindow::openDocument);
connect(actionClose, &QAction::triggered, this, &MainWindow::closeDocument);
connect(actionNew, &QAction::triggered, this, &MainWindow::newDocument);
connect(actionSave, &QAction::triggered, this, &MainWindow::saveDocument);
connect(actionExit, &QAction::triggered, this, &QWidget::close);
connect(actionRed, &QAction::triggered, this, &MainWindow::setShapeColor);
connect(actionGreen, &QAction::triggered, this, &MainWindow::setShapeColor);
connect(actionBlue, &QAction::triggered, this, &MainWindow::setShapeColor);
connect(actionAddCircle, &QAction::triggered, this, &MainWindow::addShape);
connect(actionAddRectangle, &QAction::triggered, this, &MainWindow::addShape);
connect(actionAddTriangle, &QAction::triggered, this, &MainWindow::addShape);
connect(actionRemoveShape, &QAction::triggered, this, &MainWindow::removeShape);
connect(actionAddRobot, &QAction::triggered, this, &MainWindow::addRobot);
connect(actionAddSnowman, &QAction::triggered, this, &MainWindow::addSnowman);
connect(actionAbout, &QAction::triggered, this, &MainWindow::about);
connect(actionAboutQt, &QAction::triggered, this, &MainWindow::aboutQt);
connect(undoLimit, &QSpinBox::valueChanged, this, &MainWindow::updateActions);
connect(documentTabs, &QTabWidget::currentChanged, this, &MainWindow::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 == nullptr ? nullptr : doc->undoStack());
QString shapeName = doc == nullptr ? QString() : doc->currentShapeName();
actionAddRobot->setEnabled(doc != nullptr);
actionAddSnowman->setEnabled(doc != nullptr);
actionAddCircle->setEnabled(doc != nullptr);
actionAddRectangle->setEnabled(doc != nullptr);
actionAddTriangle->setEnabled(doc != nullptr);
actionClose->setEnabled(doc != nullptr);
actionSave->setEnabled(doc != nullptr && !doc->undoStack()->isClean());
undoLimit->setEnabled(doc != nullptr && 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 != nullptr) {
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, &Document::currentShapeChanged, this, &MainWindow::updateActions);
connect(doc->undoStack(), &QUndoStack::indexChanged, this, &MainWindow::updateActions);
connect(doc->undoStack(), &QUndoStack::cleanChanged, this, &MainWindow::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, &Document::currentShapeChanged, this, &MainWindow::updateActions);
disconnect(doc->undoStack(), &QUndoStack::indexChanged, this, &MainWindow::updateActions);
disconnect(doc->undoStack(), &QUndoStack::cleanChanged, this, &MainWindow::updateActions);
if (documentTabs->count() == 0) {
newDocument();
updateActions();
}
}
void MainWindow::saveDocument()
{
Document *doc = currentDocument();
if (doc == nullptr)
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 == nullptr)
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 = QRandomGenerator::global()->bounded(3);
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 = qRound((s.width() - min.width()) * (QRandomGenerator::global()->bounded(1.0)));
int top = qRound((s.height() - min.height()) * (QRandomGenerator::global()->bounded(1.0)));
int width = qRound((s.width() - left - min.width()) * (QRandomGenerator::global()->bounded(1.0))) + min.width();
int height = qRound((s.height() - top - min.height()) * (QRandomGenerator::global()->bounded(1.0))) + min.height();
return QRect(left, top, width, height);
}
void MainWindow::addShape()
{
Document *doc = currentDocument();
if (doc == nullptr)
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 == nullptr)
return;
QString shapeName = doc->currentShapeName();
if (shapeName.isEmpty())
return;
doc->undoStack()->push(new RemoveShapeCommand(doc, shapeName));
}
void MainWindow::setShapeColor()
{
Document *doc = currentDocument();
if (doc == nullptr)
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 == nullptr)
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 == nullptr)
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"));
}

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@ -1,49 +0,0 @@
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "ui_mainwindow.h"
class Document;
class MainWindow : public QMainWindow, public Ui::MainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
void addDocument(Document *doc);
void removeDocument(Document *doc);
void setCurrentDocument(Document *doc);
Document *currentDocument() const;
public slots:
void openDocument();
void saveDocument();
void closeDocument();
void newDocument();
void addShape();
void removeShape();
void setShapeColor();
void addSnowman();
void addRobot();
void about();
void aboutQt();
private slots:
void updateActions();
private:
QUndoGroup *m_undoGroup;
QString fixedWindowTitle(const Document *doc) const;
};
#endif // MAINWINDOW_H

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@ -1,322 +0,0 @@
<ui version="4.0" >
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow" >
<property name="geometry" >
<rect>
<x>0</x>
<y>0</y>
<width>567</width>
<height>600</height>
</rect>
</property>
<property name="iconSize" >
<size>
<width>32</width>
<height>32</height>
</size>
</property>
<widget class="QWidget" name="centralwidget" >
<layout class="QVBoxLayout" >
<property name="margin" >
<number>0</number>
</property>
<property name="spacing" >
<number>0</number>
</property>
<item>
<widget class="QTabWidget" name="documentTabs" >
<property name="currentIndex" >
<number>0</number>
</property>
<widget class="QWidget" name="tab" >
<attribute name="title" >
<string>Tab 1</string>
</attribute>
</widget>
</widget>
</item>
</layout>
</widget>
<widget class="QMenuBar" name="menubar" >
<property name="geometry" >
<rect>
<x>0</x>
<y>0</y>
<width>567</width>
<height>27</height>
</rect>
</property>
<widget class="QMenu" name="menuFile" >
<property name="title" >
<string>File</string>
</property>
<addaction name="actionNew" />
<addaction name="actionOpen" />
<addaction name="actionSave" />
<addaction name="actionClose" />
<addaction name="separator" />
<addaction name="actionExit" />
</widget>
<widget class="QMenu" name="menuShape" >
<property name="title" >
<string>Edit</string>
</property>
<widget class="QMenu" name="menuMacros" >
<property name="title" >
<string>Macros</string>
</property>
<addaction name="actionAddRobot" />
<addaction name="actionAddSnowman" />
</widget>
<addaction name="separator" />
<addaction name="actionAddCircle" />
<addaction name="actionAddRectangle" />
<addaction name="actionAddTriangle" />
<addaction name="actionRemoveShape" />
<addaction name="separator" />
<addaction name="actionRed" />
<addaction name="actionGreen" />
<addaction name="actionBlue" />
<addaction name="separator" />
<addaction name="menuMacros" />
</widget>
<widget class="QMenu" name="menuHelp" >
<property name="title" >
<string>Help</string>
</property>
<addaction name="actionAbout" />
<addaction name="actionAboutQt" />
</widget>
<addaction name="menuFile" />
<addaction name="menuShape" />
<addaction name="menuHelp" />
</widget>
<widget class="QStatusBar" name="statusbar" />
<widget class="QToolBar" name="toolBar" >
<property name="windowTitle" >
<string>File actions</string>
</property>
<property name="orientation" >
<enum>Qt::Horizontal</enum>
</property>
<attribute name="toolBarArea" >
<enum>TopToolBarArea</enum>
</attribute>
<attribute name="toolBarBreak" >
<bool>false</bool>
</attribute>
<addaction name="actionNew" />
<addaction name="actionOpen" />
<addaction name="actionSave" />
<addaction name="actionClose" />
<addaction name="separator" />
</widget>
<widget class="QToolBar" name="shapeToolBar" >
<property name="windowTitle" >
<string>Shape actions</string>
</property>
<property name="orientation" >
<enum>Qt::Vertical</enum>
</property>
<attribute name="toolBarArea" >
<enum>LeftToolBarArea</enum>
</attribute>
<attribute name="toolBarBreak" >
<bool>false</bool>
</attribute>
<addaction name="actionAddRectangle" />
<addaction name="actionAddCircle" />
<addaction name="actionAddTriangle" />
<addaction name="actionRemoveShape" />
<addaction name="separator" />
<addaction name="actionRed" />
<addaction name="actionGreen" />
<addaction name="actionBlue" />
</widget>
<widget class="QDockWidget" name="dockWidget" >
<property name="windowTitle" >
<string>Undo Stack</string>
</property>
<attribute name="dockWidgetArea" >
<number>2</number>
</attribute>
<widget class="QWidget" name="dockWidgetContents" >
<layout class="QVBoxLayout" >
<property name="margin" >
<number>0</number>
</property>
<property name="spacing" >
<number>4</number>
</property>
<item>
<layout class="QHBoxLayout" >
<property name="margin" >
<number>0</number>
</property>
<property name="spacing" >
<number>6</number>
</property>
<item>
<spacer>
<property name="orientation" >
<enum>Qt::Horizontal</enum>
</property>
<property name="sizeHint" >
<size>
<width>40</width>
<height>20</height>
</size>
</property>
</spacer>
</item>
<item>
<widget class="QLabel" name="label" >
<property name="text" >
<string>Undo limit</string>
</property>
</widget>
</item>
<item>
<widget class="QSpinBox" name="undoLimit" />
</item>
</layout>
</item>
<item>
<widget class="QUndoView" name="undoView" >
<property name="alternatingRowColors" >
<bool>false</bool>
</property>
</widget>
</item>
</layout>
</widget>
</widget>
<action name="actionOpen" >
<property name="icon" >
<iconset resource="undo.qrc" >:/icons/fileopen.png</iconset>
</property>
<property name="text" >
<string>&amp;Open</string>
</property>
</action>
<action name="actionClose" >
<property name="icon" >
<iconset resource="undo.qrc" >:/icons/fileclose.png</iconset>
</property>
<property name="text" >
<string>&amp;Close</string>
</property>
</action>
<action name="actionNew" >
<property name="icon" >
<iconset resource="undo.qrc" >:/icons/filenew.png</iconset>
</property>
<property name="text" >
<string>&amp;New</string>
</property>
</action>
<action name="actionSave" >
<property name="icon" >
<iconset resource="undo.qrc" >:/icons/filesave.png</iconset>
</property>
<property name="text" >
<string>&amp;Save</string>
</property>
</action>
<action name="actionExit" >
<property name="icon" >
<iconset resource="undo.qrc" >:/icons/exit.png</iconset>
</property>
<property name="text" >
<string>E&amp;xit</string>
</property>
</action>
<action name="actionRed" >
<property name="icon" >
<iconset resource="undo.qrc" >:/icons/red.png</iconset>
</property>
<property name="text" >
<string>Red</string>
</property>
</action>
<action name="actionGreen" >
<property name="icon" >
<iconset resource="undo.qrc" >:/icons/green.png</iconset>
</property>
<property name="text" >
<string>Green</string>
</property>
</action>
<action name="actionBlue" >
<property name="icon" >
<iconset resource="undo.qrc" >:/icons/blue.png</iconset>
</property>
<property name="text" >
<string>Blue</string>
</property>
</action>
<action name="actionAddRectangle" >
<property name="icon" >
<iconset resource="undo.qrc" >:/icons/rectangle.png</iconset>
</property>
<property name="text" >
<string>Add Rectangle</string>
</property>
</action>
<action name="actionAddCircle" >
<property name="icon" >
<iconset resource="undo.qrc" >:/icons/circle.png</iconset>
</property>
<property name="text" >
<string>Add Circle</string>
</property>
</action>
<action name="actionRemoveShape" >
<property name="icon" >
<iconset resource="undo.qrc" >:/icons/remove.png</iconset>
</property>
<property name="text" >
<string>Remove Shape</string>
</property>
</action>
<action name="actionAddRobot" >
<property name="text" >
<string>Add robot</string>
</property>
</action>
<action name="actionAddSnowman" >
<property name="text" >
<string>Add snowan</string>
</property>
</action>
<action name="actionAddTriangle" >
<property name="icon" >
<iconset resource="undo.qrc" >:/icons/triangle.png</iconset>
</property>
<property name="text" >
<string>addTriangle</string>
</property>
</action>
<action name="actionAbout" >
<property name="text" >
<string>About</string>
</property>
</action>
<action name="actionAboutQt" >
<property name="text" >
<string>About Qt</string>
</property>
</action>
</widget>
<customwidgets>
<customwidget>
<class>QUndoView</class>
<extends>QListView</extends>
<header>qundoview.h</header>
</customwidget>
</customwidgets>
<resources>
<include location="undo.qrc" />
</resources>
<connections/>
</ui>

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QT += widgets
requires(qtConfig(undoview))
SOURCES += main.cpp mainwindow.cpp commands.cpp document.cpp
HEADERS += mainwindow.h commands.h document.h
FORMS += mainwindow.ui
build_all:!build_pass {
CONFIG -= build_all
CONFIG += release
}
RESOURCES += undo.qrc
# install
target.path = $$[QT_INSTALL_EXAMPLES]/widgets/tools/undo
INSTALLS += target

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@ -1,20 +0,0 @@
<RCC>
<qresource prefix="/" >
<file>icons/background.png</file>
<file>icons/blue.png</file>
<file>icons/circle.png</file>
<file>icons/exit.png</file>
<file>icons/fileclose.png</file>
<file>icons/filenew.png</file>
<file>icons/fileopen.png</file>
<file>icons/filesave.png</file>
<file>icons/green.png</file>
<file>icons/ok.png</file>
<file>icons/rectangle.png</file>
<file>icons/red.png</file>
<file>icons/redo.png</file>
<file>icons/remove.png</file>
<file>icons/triangle.png</file>
<file>icons/undo.png</file>
</qresource>
</RCC>

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@ -35,7 +35,12 @@ target_link_libraries(undoframework PRIVATE
# Resources:
set(undoframework_resource_files
"images/cross.png"
"icons/cross.png"
"icons/rectangle.png"
"icons/redo.png"
"icons/remove.png"
"icons/triangle.png"
"icons/undo.png"
)
qt_add_resources(undoframework "undoframework"

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@ -7,70 +7,75 @@
#include "commands.h"
#include <QAction>
#include <QDockWidget>
#include <QGraphicsView>
#include <QMenu>
#include <QMenuBar>
#include <QMessageBox>
#include <QToolBar>
#include <QUndoView>
//! [0]
MainWindow::MainWindow()
{
undoStack = new QUndoStack(this);
createActions();
createMenus();
createUndoView();
diagramScene = new DiagramScene();
QBrush pixmapBrush(QPixmap(":/images/cross.png").scaled(30, 30));
const QBrush pixmapBrush(QPixmap(":/icons/cross.png").scaled(30, 30));
diagramScene->setBackgroundBrush(pixmapBrush);
diagramScene->setSceneRect(QRect(0, 0, 500, 500));
createActions();
createMenus();
createToolBars();
createUndoView();
connect(diagramScene, &DiagramScene::itemMoved,
this, &MainWindow::itemMoved);
connect(diagramScene, &DiagramScene::selectionChanged,
this, &MainWindow::updateActions);
setWindowTitle("Undo Framework");
QGraphicsView *view = new QGraphicsView(diagramScene);
setCentralWidget(view);
resize(700, 500);
adjustSize();
}
//! [0]
//! [1]
void MainWindow::createUndoView()
{
undoView = new QUndoView(undoStack);
undoView->setWindowTitle(tr("Command List"));
undoView->show();
undoView->setAttribute(Qt::WA_QuitOnClose, false);
QDockWidget *undoDockWidget = new QDockWidget;
undoDockWidget->setWindowTitle(tr("Command List"));
undoDockWidget->setWidget(new QUndoView(undoStack));
addDockWidget(Qt::RightDockWidgetArea, undoDockWidget);
}
//! [1]
//! [2]
void MainWindow::createActions()
{
deleteAction = new QAction(tr("&Delete Item"), this);
deleteAction = new QAction(QIcon(":/icons/remove.png"), tr("&Delete Item"), this);
deleteAction->setShortcut(tr("Del"));
connect(deleteAction, &QAction::triggered, this, &MainWindow::deleteItem);
//! [2] //! [3]
//! [2]
//! [3] //! [4]
addBoxAction = new QAction(tr("Add &Box"), this);
//! [4]
addBoxAction = new QAction(QIcon(":/icons/rectangle.png"), tr("Add &Box"), this);
addBoxAction->setShortcut(tr("Ctrl+O"));
connect(addBoxAction, &QAction::triggered, this, &MainWindow::addBox);
addTriangleAction = new QAction(tr("Add &Triangle"), this);
addTriangleAction = new QAction(QIcon(":/icons/triangle.png"), tr("Add &Triangle"), this);
addTriangleAction->setShortcut(tr("Ctrl+T"));
connect(addTriangleAction, &QAction::triggered, this, &MainWindow::addTriangle);
//! [5]
undoAction = undoStack->createUndoAction(this, tr("&Undo"));
undoAction->setIcon(QIcon(":/icons/undo.png"));
undoAction->setShortcuts(QKeySequence::Undo);
redoAction = undoStack->createRedoAction(this, tr("&Redo"));
redoAction->setIcon(QIcon(":/icons/redo.png"));
redoAction->setShortcuts(QKeySequence::Redo);
//! [5]
@ -83,46 +88,66 @@ void MainWindow::createActions()
aboutShortcuts << tr("Ctrl+A") << tr("Ctrl+B");
aboutAction->setShortcuts(aboutShortcuts);
connect(aboutAction, &QAction::triggered, this, &MainWindow::about);
}
//! [6]
updateActions();
}
void MainWindow::updateActions()
{
deleteAction->setEnabled(!diagramScene->selectedItems().isEmpty());
}
//! [6]
//! [7]
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);
//! [8]
helpMenu = menuBar()->addMenu(tr("&About"));
helpMenu->addAction(aboutAction);
//! [8]
}
void MainWindow::createToolBars()
{
QToolBar *editToolBar = new QToolBar;
editToolBar->addAction(undoAction);
editToolBar->addAction(redoAction);
editToolBar->addSeparator();
editToolBar->addAction(deleteAction);
//! [8]
QToolBar *itemToolBar = new QToolBar;
itemToolBar->addAction(addBoxAction);
itemToolBar->addAction(addTriangleAction);
//! [9]
addToolBar(editToolBar);
addToolBar(itemToolBar);
}
//! [9]
//! [11]
void MainWindow::itemMoved(DiagramItem *movedItem,
const QPointF &oldPosition)
{
undoStack->push(new MoveCommand(movedItem, oldPosition));
}
//! [9]
//! [11]
//! [10]
//! [12]
void MainWindow::deleteItem()
{
if (diagramScene->selectedItems().isEmpty())
@ -131,20 +156,6 @@ void MainWindow::deleteItem()
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]

View File

@ -32,12 +32,12 @@ private slots:
void addBox();
void addTriangle();
void about();
void itemMenuAboutToShow();
void itemMenuAboutToHide();
void updateActions();
private:
void createActions();
void createMenus();
void createToolBars();
void createUndoView();
QAction *deleteAction = nullptr;

View File

@ -1,6 +1,10 @@
<!DOCTYPE RCC><RCC version="1.0">
<qresource>
<file>images/cross.png</file>
<file>icons/cross.png</file>
<file>icons/rectangle.png</file>
<file>icons/redo.png</file>
<file>icons/remove.png</file>
<file>icons/triangle.png</file>
<file>icons/undo.png</file>
</qresource>
</RCC>