examples/multitouch/pinchzoom/graphicsview.cpp
changeset 37 758a864f9613
parent 36 ef0373b55136
--- a/examples/multitouch/pinchzoom/graphicsview.cpp	Fri Sep 17 08:34:18 2010 +0300
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,85 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
-** All rights reserved.
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** 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 "graphicsview.h"
-
-#include <QScrollBar>
-#include <QTouchEvent>
-
-GraphicsView::GraphicsView(QGraphicsScene *scene, QWidget *parent)
-    : QGraphicsView(scene, parent), totalScaleFactor(1)
-{
-    viewport()->setAttribute(Qt::WA_AcceptTouchEvents);
-    setDragMode(ScrollHandDrag);
-}
-
-bool GraphicsView::viewportEvent(QEvent *event)
-{
-    switch (event->type()) {
-    case QEvent::TouchBegin:
-    case QEvent::TouchUpdate:
-    case QEvent::TouchEnd:
-    {
-        QTouchEvent *touchEvent = static_cast<QTouchEvent *>(event);
-        QList<QTouchEvent::TouchPoint> touchPoints = touchEvent->touchPoints();
-        if (touchPoints.count() == 2) {
-            // determine scale factor
-            const QTouchEvent::TouchPoint &touchPoint0 = touchPoints.first();
-            const QTouchEvent::TouchPoint &touchPoint1 = touchPoints.last();
-            qreal currentScaleFactor =
-                    QLineF(touchPoint0.pos(), touchPoint1.pos()).length()
-                    / QLineF(touchPoint0.startPos(), touchPoint1.startPos()).length();
-            if (touchEvent->touchPointStates() & Qt::TouchPointReleased) {
-                // if one of the fingers is released, remember the current scale
-                // factor so that adding another finger later will continue zooming
-                // by adding new scale factor to the existing remembered value.
-                totalScaleFactor *= currentScaleFactor;
-                currentScaleFactor = 1;
-            }
-            setTransform(QTransform().scale(totalScaleFactor * currentScaleFactor,
-                                            totalScaleFactor * currentScaleFactor));
-        }
-        return true;
-    }
-    default:
-        break;
-    }
-    return QGraphicsView::viewportEvent(event);
-}