diff -r 000000000000 -r 1918ee327afb demos/undo/document.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/demos/undo/document.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,445 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 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 <qevent.h>
+#include <QPainter>
+#include <QTextStream>
+#include <QUndoStack>
+#include "document.h"
+#include "commands.h"
+
+static const 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)
+{
+    QString result;
+
+    switch (type) {
+        case Rectangle:
+            result = QLatin1String("Rectangle");
+            break;
+        case Circle:
+            result = QLatin1String("Circle");
+            break;
+        case Triangle:
+            result = QLatin1String("Triangle");
+            break;
+    }
+
+    return result;
+}
+
+Shape::Type Shape::stringToType(const QString &s, bool *ok)
+{
+    if (ok != 0)
+        *ok = true;
+
+    if (s == QLatin1String("Rectangle"))
+        return Rectangle;
+    if (s == QLatin1String("Circle"))
+        return Circle;
+    if (s == QLatin1String("Triangle"))
+        return Triangle;
+
+    if (ok != 0)
+        *ok = false;
+    return Rectangle;
+}
+
+/******************************************************************************
+** Document
+*/
+
+Document::Document(QWidget *parent)
+    : QWidget(parent), m_currentIndex(-1), m_mousePressIndex(-1), m_resizeHandlePressed(false)
+{
+    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->pos());;
+    if (index != -1) {
+        setCurrentShape(index);
+
+        const Shape &shape = m_shapeList.at(index);
+        m_resizeHandlePressed = shape.resizeHandle().contains(event->pos());
+
+        if (m_resizeHandlePressed)
+            m_mousePressOffset = shape.rect().bottomRight() - event->pos();
+        else
+            m_mousePressOffset = event->pos() - 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->pos() + m_mousePressOffset);
+    } else {
+        rect = shape.rect();
+        rect.moveTopLeft(event->pos() - 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.dark(150));
+    result.setColorAt(0.5, c.light(200));
+    result.setColorAt(1, c.dark(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();
+}
+