6a4aa096e9
Use the QEventPoints API instead. Change-Id: I7310fd34df110cad508f6188a41ad452a3cf848d Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
99 lines
3.7 KiB
C++
99 lines
3.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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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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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** 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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** contributors may be used to endorse or promote products derived
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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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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "knob.h"
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#include <QBrush>
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#include <QTouchEvent>
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Knob::Knob()
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: QGraphicsEllipseItem(-50, -50, 100, 100)
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{
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setAcceptTouchEvents(true);
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setBrush(Qt::lightGray);
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QGraphicsEllipseItem *leftItem = new QGraphicsEllipseItem(0, 0, 20, 20, this);
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leftItem->setPos(-40, -10);
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leftItem->setBrush(Qt::darkGreen);
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QGraphicsEllipseItem *rightItem = new QGraphicsEllipseItem(0, 0, 20, 20, this);
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rightItem->setPos(20, -10);
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rightItem->setBrush(Qt::darkRed);
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}
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bool Knob::sceneEvent(QEvent *event)
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{
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switch (event->type()) {
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case QEvent::TouchBegin:
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case QEvent::TouchUpdate:
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case QEvent::TouchEnd:
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{
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QTouchEvent *touchEvent = static_cast<QTouchEvent *>(event);
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if (touchEvent->points().count() == 2) {
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const QEventPoint &touchPoint1 = touchEvent->points().first();
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const QEventPoint &touchPoint2 = touchEvent->points().last();
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QLineF line1(touchPoint1.sceneLastPosition(), touchPoint2.sceneLastPosition());
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QLineF line2(touchPoint1.scenePosition(), touchPoint2.scenePosition());
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setTransform(QTransform().rotate(line2.angleTo(line1)), true);
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}
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break;
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}
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default:
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return QGraphicsItem::sceneEvent(event);
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}
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return true;
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}
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