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https://github.com/crystalidea/qt6windows7.git
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52 lines
1.4 KiB
C++
52 lines
1.4 KiB
C++
// Copyright (C) 2016 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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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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