| 1 | /**************************************************************************** |
|---|---|
| 2 | ** |
| 3 | ** Copyright (C) 2016 The Qt Company Ltd. |
| 4 | ** Contact: https://www.qt.io/licensing/ |
| 5 | ** |
| 6 | ** This file is part of the Qt Charts module of the Qt Toolkit. |
| 7 | ** |
| 8 | ** $QT_BEGIN_LICENSE:GPL$ |
| 9 | ** Commercial License Usage |
| 10 | ** Licensees holding valid commercial Qt licenses may use this file in |
| 11 | ** accordance with the commercial license agreement provided with the |
| 12 | ** Software or, alternatively, in accordance with the terms contained in |
| 13 | ** a written agreement between you and The Qt Company. For licensing terms |
| 14 | ** and conditions see https://www.qt.io/terms-conditions. For further |
| 15 | ** information use the contact form at https://www.qt.io/contact-us. |
| 16 | ** |
| 17 | ** GNU General Public License Usage |
| 18 | ** Alternatively, this file may be used under the terms of the GNU |
| 19 | ** General Public License version 3 or (at your option) any later version |
| 20 | ** approved by the KDE Free Qt Foundation. The licenses are as published by |
| 21 | ** the Free Software Foundation and appearing in the file LICENSE.GPL3 |
| 22 | ** included in the packaging of this file. Please review the following |
| 23 | ** information to ensure the GNU General Public License requirements will |
| 24 | ** be met: https://www.gnu.org/licenses/gpl-3.0.html. |
| 25 | ** |
| 26 | ** $QT_END_LICENSE$ |
| 27 | ** |
| 28 | ****************************************************************************/ |
| 29 | |
| 30 | #include "chart.h" |
| 31 | #include <QtWidgets/QGesture> |
| 32 | #include <QtWidgets/QGraphicsScene> |
| 33 | #include <QtWidgets/QGraphicsView> |
| 34 | |
| 35 | Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags) |
| 36 | : QChart(QChart::ChartTypeCartesian, parent, wFlags) |
| 37 | { |
| 38 | // Seems that QGraphicsView (QChartView) does not grab gestures. |
| 39 | // They can only be grabbed here in the QGraphicsWidget (QChart). |
| 40 | grabGesture(type: Qt::PanGesture); |
| 41 | grabGesture(type: Qt::PinchGesture); |
| 42 | } |
| 43 | |
| 44 | Chart::~Chart() |
| 45 | { |
| 46 | |
| 47 | } |
| 48 | |
| 49 | //![1] |
| 50 | bool Chart::sceneEvent(QEvent *event) |
| 51 | { |
| 52 | if (event->type() == QEvent::Gesture) |
| 53 | return gestureEvent(event: static_cast<QGestureEvent *>(event)); |
| 54 | return QChart::event(event); |
| 55 | } |
| 56 | |
| 57 | bool Chart::gestureEvent(QGestureEvent *event) |
| 58 | { |
| 59 | if (QGesture *gesture = event->gesture(type: Qt::PanGesture)) { |
| 60 | QPanGesture *pan = static_cast<QPanGesture *>(gesture); |
| 61 | QChart::scroll(dx: -(pan->delta().x()), dy: pan->delta().y()); |
| 62 | } |
| 63 | |
| 64 | if (QGesture *gesture = event->gesture(type: Qt::PinchGesture)) { |
| 65 | QPinchGesture *pinch = static_cast<QPinchGesture *>(gesture); |
| 66 | if (pinch->changeFlags() & QPinchGesture::ScaleFactorChanged) |
| 67 | QChart::zoom(factor: pinch->scaleFactor()); |
| 68 | } |
| 69 | |
| 70 | return true; |
| 71 | } |
| 72 | //![1] |
| 73 |