summaryrefslogtreecommitdiffstats
path: root/examples/widgets/scroller/graphicsview/main.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'examples/widgets/scroller/graphicsview/main.cpp')
-rw-r--r--examples/widgets/scroller/graphicsview/main.cpp291
1 files changed, 291 insertions, 0 deletions
diff --git a/examples/widgets/scroller/graphicsview/main.cpp b/examples/widgets/scroller/graphicsview/main.cpp
new file mode 100644
index 0000000000..0837719bb5
--- /dev/null
+++ b/examples/widgets/scroller/graphicsview/main.cpp
@@ -0,0 +1,291 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** 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 Nokia Corporation and its Subsidiary(-ies) 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 <QtCore>
+#include <QtWidgets>
+
+#define NUM_ITEMS 100
+#define NUM_LISTS 10
+
+/*!
+ \class RectObject
+ Note that it needs to be a QGraphicsObject or else the gestures will not work correctly.
+*/
+class RectObject : public QGraphicsObject
+{
+ Q_OBJECT
+
+public:
+
+ RectObject(const QString &text, qreal x, qreal y, qreal width, qreal height, QBrush brush, QGraphicsItem *parent = 0)
+ : QGraphicsObject(parent)
+ , m_text(text)
+ , m_rect(x, y, width, height)
+ , m_pen(brush.color().lighter(), 3.0)
+ , m_brush(brush)
+ {
+ setFlag(QGraphicsItem::ItemClipsToShape, true);
+ }
+
+ QRectF boundingRect() const
+ {
+ // here we only want the size of the children and not the size of the children of the children...
+ qreal halfpw = m_pen.widthF() / 2;
+ QRectF rect = m_rect;
+ if (halfpw > 0.0)
+ rect.adjust(-halfpw, -halfpw, halfpw, halfpw);
+
+ return rect;
+ }
+
+ void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+ {
+ Q_UNUSED(option);
+ Q_UNUSED(widget);
+ painter->setPen(m_pen);
+ painter->setBrush(m_brush);
+ painter->drawRect(m_rect);
+
+ painter->setPen(Qt::black);
+ QFont f;
+ f.setPixelSize(m_rect.height());
+ painter->setFont(f);
+ painter->drawText(m_rect, Qt::AlignCenter, m_text);
+ }
+
+ QString m_text;
+ QRectF m_rect;
+ QPen m_pen;
+ QBrush m_brush;
+};
+
+class ViewObject : public QGraphicsObject
+{
+ Q_OBJECT
+public:
+ ViewObject(QGraphicsObject *parent)
+ : QGraphicsObject(parent)
+ { }
+
+ QRectF boundingRect() const
+ {
+ QRectF rect;
+ foreach (QGraphicsItem *item, childItems())
+ rect |= item->boundingRect().translated(item->pos());
+ return rect;
+ }
+
+ void paint(QPainter*, const QStyleOptionGraphicsItem*, QWidget*)
+ { }
+};
+
+class ListObject : public QGraphicsObject
+{
+ Q_OBJECT
+
+public:
+ ListObject(const QSizeF &size, bool useTouch)
+ {
+ m_size = size;
+ setFlag(QGraphicsItem::ItemClipsChildrenToShape, true);
+ // grab gesture via Touch or Mouse events
+ QScroller::grabGesture(this, useTouch ? QScroller::TouchGesture : QScroller::LeftMouseButtonGesture);
+
+ // this needs to be QGraphicsOBJECT - otherwise gesture recognition
+ // will not work for the parent of the viewport (in this case the
+ // list)
+ m_viewport = new ViewObject(this);
+
+ }
+
+ QGraphicsObject *viewport() const
+ {
+ return m_viewport;
+ }
+
+ bool event(QEvent *e)
+ {
+ switch (e->type()) {
+// ![2]
+ case QEvent::ScrollPrepare: {
+ QScrollPrepareEvent *se = static_cast<QScrollPrepareEvent *>(e);
+ se->setViewportSize(m_size);
+ QRectF br = m_viewport->boundingRect();
+ se->setContentPosRange(QRectF(0, 0,
+ qMax(qreal(0), br.width() - m_size.width()),
+ qMax(qreal(0), br.height() - m_size.height())));
+ se->setContentPos(-m_viewport->pos());
+ se->accept();
+ return true;
+ }
+// ![1]
+// ![2]
+ case QEvent::Scroll: {
+ QScrollEvent *se = static_cast<QScrollEvent *>(e);
+ m_viewport->setPos(-se->contentPos() - se->overshootDistance());
+ return true;
+ }
+// ![2]
+ default:
+ break;
+ }
+ return QGraphicsObject::event(e);
+ }
+
+ bool sceneEvent(QEvent *e)
+ {
+ switch (e->type()) {
+ case QEvent::TouchBegin: {
+ // We need to return true for the TouchBegin here in the
+ // top-most graphics object - otherwise gestures in our parent
+ // objects will NOT work at all (the accept() flag is already
+ // set due to our setAcceptTouchEvents(true) call in the c'tor
+ return true;
+
+ }
+ case QEvent::GraphicsSceneMousePress: {
+ // We need to return true for the MousePress here in the
+ // top-most graphics object - otherwise gestures in our parent
+ // objects will NOT work at all (the accept() flag is already
+ // set to true by Qt)
+ return true;
+
+ }
+ default:
+ break;
+ }
+ return QGraphicsObject::sceneEvent(e);
+ }
+
+ QRectF boundingRect() const
+ {
+ return QRectF(0, 0, m_size.width() + 3, m_size.height());
+ }
+
+ void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
+ {
+ Q_UNUSED(option);
+ Q_UNUSED(widget);
+ painter->setPen(QPen(QColor(100, 100, 100), 3.0));
+ painter->drawRect(QRect(1.5, 1.5, m_size.width() - 3, m_size.height() - 3));
+ }
+
+ QSizeF m_size;
+ ViewObject *m_viewport;
+};
+
+class MainWindow : public QMainWindow
+{
+ Q_OBJECT
+
+public:
+ MainWindow(bool useTouch)
+ {
+ m_scene = new QGraphicsScene();
+
+ // -- make the main list
+ ListObject *mainList = new ListObject(QSizeF(780, 400), useTouch);
+ mainList->setObjectName(QLatin1String("MainList"));
+ m_scene->addItem(mainList);
+// ![3]
+ for (int i=0; i<NUM_LISTS; i++) {
+ ListObject *childList = new ListObject(QSizeF(mainList->m_size.width()/3, mainList->m_size.height()), useTouch);
+ childList->setObjectName(QString("ChildList %1").arg(i));
+ fillList(childList);
+ childList->setParentItem(mainList->viewport());
+ childList->setPos(i*mainList->m_size.width()/3, 0);
+ }
+ mainList->viewport()->setPos(0, 0);
+
+
+ /*
+ list1->setTransformOriginPoint(200, 200);
+ list1->setRotation(135);
+ list1->setPos(20 + 200 * .41, 20 + 200 * .41);
+ */
+// ![3]
+
+ m_view = new QGraphicsView(m_scene);
+ setCentralWidget(m_view);
+ setWindowTitle(tr("Gesture example"));
+ m_scene->setSceneRect(0, 0, m_view->viewport()->width(), m_view->viewport()->height());
+ }
+
+ /**
+ * Fills the list object \a list with RectObjects.
+ */
+ void fillList(ListObject *list)
+ {
+ qreal h = list->m_size.height() / 10;
+ for (int i=0; i<NUM_ITEMS; i++) {
+ QColor color = QColor(255*i/NUM_ITEMS, 255*(NUM_ITEMS-i)/NUM_ITEMS, 127*(i%2)+64*(i/2%2));
+ QString text = QLatin1String("Item #") + QString::number(i);
+ QGraphicsItem *rect = new RectObject(text, 0, 0, list->m_size.width() - 6, h - 3, QBrush(color), list->viewport());
+ rect->setPos(3, h*i+3);
+ }
+ list->viewport()->setPos(0, 0);
+ }
+
+
+protected:
+ void resizeEvent(QResizeEvent *e)
+ {
+ // resize the scene according to our own size to prevent scrolling
+ m_scene->setSceneRect(0, 0, m_view->viewport()->width(), m_view->viewport()->height());
+ QMainWindow::resizeEvent(e);
+ }
+
+ QGraphicsScene *m_scene;
+ QGraphicsView *m_view;
+};
+
+int main(int argc, char *argv[])
+{
+ QApplication a(argc, argv);
+ bool touch = (a.arguments().contains(QLatin1String("--touch")));
+ MainWindow mw(touch);
+ mw.show();
+#ifdef Q_OS_MAC
+ mw.raise();
+#endif
+ return a.exec();
+}
+
+#include "main.moc"