1 files changed, 109 insertions, 0 deletions
diff --git a/client/chartview.cpp b/client/chartview.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Charts module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "chartview.h"
+#include <QtGui/QMouseEvent>
+
+ChartView::ChartView(QChart *chart, QWidget *parent) :
+    QChartView(chart, parent),
+    m_isTouching(false)
+{
+    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;
+    }
+}