296 lines
9.1 KiB
C++
296 lines
9.1 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QtCore>
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#include <QtGui>
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#define NUM_ITEMS 100
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#define NUM_LISTS 10
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/*!
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\class RectObject
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Note that it needs to be a QGraphicsObject or else the gestures will not work correctly.
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*/
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class RectObject : public QGraphicsObject
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{
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Q_OBJECT
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public:
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RectObject(const QString &text, qreal x, qreal y, qreal width, qreal height, QBrush brush, QGraphicsItem *parent = 0)
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: QGraphicsObject(parent)
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, m_text(text)
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, m_rect(x, y, width, height)
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, m_pen(brush.color().lighter(), 3.0)
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, m_brush(brush)
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{
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setFlag(QGraphicsItem::ItemClipsToShape, true);
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}
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QRectF boundingRect() const
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{
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// here we only want the size of the children and not the size of the children of the children...
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qreal halfpw = m_pen.widthF() / 2;
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QRectF rect = m_rect;
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if (halfpw > 0.0)
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rect.adjust(-halfpw, -halfpw, halfpw, halfpw);
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return rect;
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}
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void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(option);
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Q_UNUSED(widget);
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painter->setPen(m_pen);
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painter->setBrush(m_brush);
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painter->drawRect(m_rect);
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painter->setPen(Qt::black);
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QFont f;
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f.setPixelSize(m_rect.height());
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painter->setFont(f);
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painter->drawText(m_rect, Qt::AlignCenter, m_text);
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}
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QString m_text;
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QRectF m_rect;
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QPen m_pen;
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QBrush m_brush;
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};
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class ViewObject : public QGraphicsObject
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{
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Q_OBJECT
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public:
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ViewObject(QGraphicsObject *parent)
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: QGraphicsObject(parent)
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{ }
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QRectF boundingRect() const
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{
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QRectF rect;
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foreach (QGraphicsItem *item, childItems())
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rect |= item->boundingRect().translated(item->pos());
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return rect;
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}
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void paint(QPainter*, const QStyleOptionGraphicsItem*, QWidget*)
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{ }
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};
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class ListObject : public QGraphicsObject
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{
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Q_OBJECT
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public:
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ListObject(const QSizeF &size, bool useTouch)
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{
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m_size = size;
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setFlag(QGraphicsItem::ItemClipsChildrenToShape, true);
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// grab gesture via Touch or Mouse events
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QScroller::grabGesture(this, useTouch ? QScroller::TouchGesture : QScroller::LeftMouseButtonGesture);
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// this needs to be QGraphicsOBJECT - otherwise gesture recognition
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// will not work for the parent of the viewport (in this case the
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// list)
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m_viewport = new ViewObject(this);
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}
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QGraphicsObject *viewport() const
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{
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return m_viewport;
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}
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bool event(QEvent *e)
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{
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switch (e->type()) {
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// ![2]
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case QEvent::ScrollPrepare: {
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QScrollPrepareEvent *se = static_cast<QScrollPrepareEvent *>(e);
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se->setViewportSize(m_size);
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QRectF br = m_viewport->boundingRect();
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se->setContentPosRange(QRectF(0, 0,
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qMax(qreal(0), br.width() - m_size.width()),
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qMax(qreal(0), br.height() - m_size.height())));
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se->setContentPos(-m_viewport->pos());
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se->accept();
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return true;
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}
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// ![1]
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// ![2]
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case QEvent::Scroll: {
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QScrollEvent *se = static_cast<QScrollEvent *>(e);
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m_viewport->setPos(-se->contentPos() - se->overshootDistance());
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return true;
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}
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// ![2]
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default:
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break;
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}
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return QGraphicsObject::event(e);
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}
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bool sceneEvent(QEvent *e)
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{
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switch (e->type()) {
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case QEvent::TouchBegin: {
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// We need to return true for the TouchBegin here in the
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// top-most graphics object - otherwise gestures in our parent
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// objects will NOT work at all (the accept() flag is already
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// set due to our setAcceptTouchEvents(true) call in the c'tor
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return true;
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}
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case QEvent::GraphicsSceneMousePress: {
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// We need to return true for the MousePress here in the
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// top-most graphics object - otherwise gestures in our parent
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// objects will NOT work at all (the accept() flag is already
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// set to true by Qt)
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return true;
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}
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default:
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break;
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}
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return QGraphicsObject::sceneEvent(e);
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}
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QRectF boundingRect() const
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{
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return QRectF(0, 0, m_size.width() + 3, m_size.height());
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}
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void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(option);
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Q_UNUSED(widget);
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painter->setPen(QPen(QColor(100, 100, 100), 3.0));
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painter->drawRect(QRect(1.5, 1.5, m_size.width() - 3, m_size.height() - 3));
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}
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QSizeF m_size;
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ViewObject *m_viewport;
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};
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class MainWindow : public QMainWindow
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{
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Q_OBJECT
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public:
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MainWindow(bool useTouch)
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{
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m_scene = new QGraphicsScene();
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// -- make the main list
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ListObject *mainList = new ListObject(QSizeF(780, 400), useTouch);
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mainList->setObjectName(QLatin1String("MainList"));
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m_scene->addItem(mainList);
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// ![3]
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for (int i=0; i<NUM_LISTS; i++) {
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ListObject *childList = new ListObject(QSizeF(mainList->m_size.width()/3, mainList->m_size.height()), useTouch);
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childList->setObjectName(QString("ChildList %1").arg(i));
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fillList(childList);
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childList->setParentItem(mainList->viewport());
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childList->setPos(i*mainList->m_size.width()/3, 0);
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}
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mainList->viewport()->setPos(0, 0);
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/*
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list1->setTransformOriginPoint(200, 200);
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list1->setRotation(135);
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list1->setPos(20 + 200 * .41, 20 + 200 * .41);
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*/
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// ![3]
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m_view = new QGraphicsView(m_scene);
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setCentralWidget(m_view);
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setWindowTitle(tr("Gesture example"));
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m_scene->setSceneRect(0, 0, m_view->viewport()->width(), m_view->viewport()->height());
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}
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/**
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* Fills the list object \a list with RectObjects.
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*/
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void fillList(ListObject *list)
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{
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qreal h = list->m_size.height() / 10;
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for (int i=0; i<NUM_ITEMS; i++) {
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QColor color = QColor(255*i/NUM_ITEMS, 255*(NUM_ITEMS-i)/NUM_ITEMS, 127*(i%2)+64*(i/2%2));
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QString text = QLatin1String("Item #") + QString::number(i);
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QGraphicsItem *rect = new RectObject(text, 0, 0, list->m_size.width() - 6, h - 3, QBrush(color), list->viewport());
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rect->setPos(3, h*i+3);
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}
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list->viewport()->setPos(0, 0);
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}
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protected:
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void resizeEvent(QResizeEvent *e)
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{
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// resize the scene according to our own size to prevent scrolling
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m_scene->setSceneRect(0, 0, m_view->viewport()->width(), m_view->viewport()->height());
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QMainWindow::resizeEvent(e);
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}
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QGraphicsScene *m_scene;
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QGraphicsView *m_view;
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};
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int main(int argc, char *argv[])
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{
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QApplication a(argc, argv);
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bool touch = (a.arguments().contains(QLatin1String("--touch")));
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MainWindow mw(touch);
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#ifdef Q_WS_S60
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mw.showMaximized();
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#else
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mw.show();
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#endif
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#ifdef Q_WS_MAC
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mw.raise();
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#endif
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return a.exec();
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}
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#include "main.moc"
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