43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
// Copyright (C) 2023 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "chart.h"
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#include <QGesture>
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#include <QGraphicsScene>
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#include <QGraphicsView>
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Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags)
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: QChart(QChart::ChartTypeCartesian, parent, wFlags)
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{
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// Seems that QGraphicsView (QChartView) does not grab gestures.
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// They can only be grabbed here in the QGraphicsWidget (QChart).
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grabGesture(Qt::PanGesture);
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grabGesture(Qt::PinchGesture);
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}
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//![1]
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bool Chart::sceneEvent(QEvent *event)
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{
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if (event->type() == QEvent::Gesture)
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return gestureEvent(static_cast<QGestureEvent *>(event));
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return QChart::event(event);
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}
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bool Chart::gestureEvent(QGestureEvent *event)
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{
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if (QGesture *gesture = event->gesture(Qt::PanGesture)) {
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auto pan = static_cast<QPanGesture *>(gesture);
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QChart::scroll(-(pan->delta().x()), pan->delta().y());
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}
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if (QGesture *gesture = event->gesture(Qt::PinchGesture)) {
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auto pinch = static_cast<QPinchGesture *>(gesture);
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if (pinch->changeFlags() & QPinchGesture::ScaleFactorChanged)
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QChart::zoom(pinch->scaleFactor());
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}
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return true;
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}
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//![1]
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