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Diffstat (limited to 'examples/widgets/touch/pinchzoom/graphicsview.cpp')
-rw-r--r-- | examples/widgets/touch/pinchzoom/graphicsview.cpp | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/examples/widgets/touch/pinchzoom/graphicsview.cpp b/examples/widgets/touch/pinchzoom/graphicsview.cpp deleted file mode 100644 index 5ad3f9152b..0000000000 --- a/examples/widgets/touch/pinchzoom/graphicsview.cpp +++ /dev/null @@ -1,95 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the examples of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:BSD$ -** 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 The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/contact-us. -** -** BSD License Usage -** Alternatively, 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 The Qt Company Ltd 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) -{ - 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); - const auto touchPoints = touchEvent->points(); - if (touchPoints.count() == 2) { - // determine scale factor - const QEventPoint &touchPoint0 = touchPoints.first(); - const QEventPoint &touchPoint1 = touchPoints.last(); - qreal currentScaleFactor = - QLineF(touchPoint0.position(), touchPoint1.position()).length() - / QLineF(touchPoint0.pressPosition(), touchPoint1.pressPosition()).length(); - if (touchEvent->touchPointStates() & QEventPoint::Released) { - // 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::fromScale(totalScaleFactor * currentScaleFactor, - totalScaleFactor * currentScaleFactor)); - } - return true; - } - default: - break; - } - return QGraphicsView::viewportEvent(event); -} |