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diff --git a/examples/widgets/tools/undo/document.cpp b/examples/widgets/tools/undo/document.cpp
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-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the demonstration applications of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:BSD$
-** 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 https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
-**
-** BSD License Usage
-** Alternatively, you may use this file under the terms of the BSD license
-** as follows:
-**
-** "Redistribution and use in source and binary forms, with or without
-** modification, are permitted provided that the following conditions are
-** met:
-** * Redistributions of source code must retain the above copyright
-** notice, this list of conditions and the following disclaimer.
-** * Redistributions in binary form must reproduce the above copyright
-** notice, this list of conditions and the following disclaimer in
-** the documentation and/or other materials provided with the
-** distribution.
-** * Neither the name of The Qt Company Ltd nor the names of its
-** contributors may be used to endorse or promote products derived
-** from this software without specific prior written permission.
-**
-**
-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-#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();
-}
-