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/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QDebug>
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#include <QGraphicsSceneMouseEvent>
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#include <QGraphicsScene>
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#include <QLegendMarker>
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#include "qlegendmarker_p.h"
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#include "legendmarkeritem_p.h"
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#include "legendscroller_p.h"
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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LegendScroller::LegendScroller(QChart *chart) : QLegend(chart),
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m_lastPos(0, 0),
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m_state(Idle),
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m_treshold(10)
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{
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}
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void LegendScroller::setOffset(const QPointF &point)
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{
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d_ptr->setOffset(point);
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}
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QPointF LegendScroller::offset() const
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{
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return d_ptr->offset();
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}
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void LegendScroller::setMoveTreshold(qreal treshold)
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{
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m_treshold = treshold;
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}
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void LegendScroller::mousePressEvent(QGraphicsSceneMouseEvent *event)
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{
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m_pressPos = event->screenPos();
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m_lastPos = m_pressPos;
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m_state = Pressed;
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event->accept();
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}
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void LegendScroller::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
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{
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QPointF delta = event->screenPos() - m_lastPos;
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switch (m_state) {
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case Pressed: {
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// calculate treshold. If enough, change to move state and send out move deltas.
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if (qAbs(delta.x()) > m_treshold || qAbs(delta.y()) > m_treshold) {
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m_state = Moved;
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m_lastPos = event->screenPos();
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move(delta);
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}
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event->accept();
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break;
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}
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case Moved: {
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m_lastPos = event->screenPos();
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move(delta);
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event->accept();
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break;
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}
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case Idle:
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default: {
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event->ignore();
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break;
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}
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}
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}
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void LegendScroller::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
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{
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m_lastPos = event->screenPos();
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switch (m_state) {
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case Pressed:
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{
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m_state = Idle;
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QList<QGraphicsItem *> items = scene()->items(event->scenePos());
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foreach (QGraphicsItem *i, items) {
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if (d_ptr->m_markerHash.contains(i)) {
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QLegendMarker *marker = d_ptr->m_markerHash.value(i);
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emit marker->clicked();
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}
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}
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event->accept();
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break;
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}
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case Moved:
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{
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scrollTo(m_lastPos - m_pressPos);
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event->accept();
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break;
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}
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default:
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{
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m_state = Idle;
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event->ignore();
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break;
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}
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}
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}
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#include "moc_legendscroller_p.cpp"
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QTCOMMERCIALCHART_END_NAMESPACE
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