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Diffstat (limited to 'examples/widgets/tools/undo/document.cpp')
| -rw-r--r-- | examples/widgets/tools/undo/document.cpp | 445 |
1 files changed, 445 insertions, 0 deletions
diff --git a/examples/widgets/tools/undo/document.cpp b/examples/widgets/tools/undo/document.cpp new file mode 100644 index 0000000000..5970ab72a1 --- /dev/null +++ b/examples/widgets/tools/undo/document.cpp @@ -0,0 +1,445 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the demonstration applications of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** 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 Digia. For licensing terms and +** conditions see http://qt.digia.com/licensing. For further information +** use the contact form at http://qt.digia.com/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 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, Digia gives you certain additional +** rights. These rights are described in the Digia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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 ¤t = 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(); +} + |