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Diffstat (limited to 'examples/multitouch/pinchzoom/graphicsview.cpp')
| -rw-r--r-- | examples/multitouch/pinchzoom/graphicsview.cpp | 85 |
1 files changed, 0 insertions, 85 deletions
diff --git a/examples/multitouch/pinchzoom/graphicsview.cpp b/examples/multitouch/pinchzoom/graphicsview.cpp deleted file mode 100644 index 041e494..0000000 --- a/examples/multitouch/pinchzoom/graphicsview.cpp +++ /dev/null @@ -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); -} |