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++ // Copyright (C) 2023 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #include "chartview.h"
++
++ #include <QMouseEvent>
++
++ ChartView::ChartView(QChart *chart, QWidget *parent)
++ : QChartView(chart, parent)
++ {
++ setRubberBand(QChartView::RectangleRubberBand);
++ }
++
++ bool ChartView::viewportEvent(QEvent *event)
++ {
++ if (event->type() == QEvent::TouchBegin) {
++ // By default touch events are converted to mouse events. So
++ // after this event we will get a mouse event also but we want
++ // to handle touch events as gestures only. So we need this safeguard
++ // to block mouse events that are actually generated from touch.
++ m_isTouching = true;
++
++ // Turn off animations when handling gestures they
++ // will only slow us down.
++ chart()->setAnimationOptions(QChart::NoAnimation);
++ }
++ return QChartView::viewportEvent(event);
++ }
++
++ void ChartView::mousePressEvent(QMouseEvent *event)
++ {
++ if (m_isTouching)
++ return;
++ QChartView::mousePressEvent(event);
++ }
++
++ void ChartView::mouseMoveEvent(QMouseEvent *event)
++ {
++ if (m_isTouching)
++ return;
++ QChartView::mouseMoveEvent(event);
++ }
++
++ void ChartView::mouseReleaseEvent(QMouseEvent *event)
++ {
++ if (m_isTouching)
++ m_isTouching = false;
++
++ // Because we disabled animations when touch event was detected
++ // we must put them back on.
++ chart()->setAnimationOptions(QChart::SeriesAnimations);
++
++ QChartView::mouseReleaseEvent(event);
++ }
++
++ //![1]
++ void ChartView::keyPressEvent(QKeyEvent *event)
++ {
++ switch (event->key()) {
++ case Qt::Key_Plus:
++ chart()->zoomIn();
++ break;
++ case Qt::Key_Minus:
++ chart()->zoomOut();
++ break;
++ //![1]
++ case Qt::Key_Left:
++ chart()->scroll(-10, 0);
++ break;
++ case Qt::Key_Right:
++ chart()->scroll(10, 0);
++ break;
++ case Qt::Key_Up:
++ chart()->scroll(0, 10);
++ break;
++ case Qt::Key_Down:
++ chart()->scroll(0, -10);
++ break;
++ default:
++ QGraphicsView::keyPressEvent(event);
++ break;
++ }
++ }