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better implementation of mouse event handling in legend
better implementation of mouse event handling in legend
sauimone - - Load All Authors

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r2197:7376343d8ef1
r2197:7376343d8ef1
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legendscroller.cpp
127 lines | 3.0 KiB | text/x-c | CppLexer
/ src / legend / legendscroller.cpp
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sauimone
Legend can now handle clicked and do scrolling
 r2183 /****************************************************************************
**
** Copyright (C) 2012 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the Qt Commercial Charts Add-on.
**
** $QT_BEGIN_LICENSE$
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
** $QT_END_LICENSE$
**
****************************************************************************/
sauimone
better implementation of mouse event handling in legend
 r2197 #include <QDebug>
sauimone
Legend can now handle clicked and do scrolling
 r2183 #include <QGraphicsSceneMouseEvent>
sauimone
better implementation of mouse event handling in legend
 r2197 #include <QGraphicsScene>
#include <QLegendMarker>
#include "qlegendmarker_p.h"
#include "legendmarkeritem_p.h"
#include "legendscroller_p.h"
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 r2183
QTCOMMERCIALCHART_BEGIN_NAMESPACE
sauimone
better implementation of mouse event handling in legend
 r2197 LegendScroller::LegendScroller(QChart *chart) : QLegend(chart),
sauimone
Kinetic scrolling is back for legend
 r2189 m_lastPos(0, 0),
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 r2183 m_state(Idle),
m_treshold(10)
{
}
sauimone
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 r2197 void LegendScroller::setOffset(const QPointF &point)
sauimone
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 r2183 {
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 r2197 d_ptr->setOffset(point);
sauimone
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 r2183 }
sauimone
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 r2197 QPointF LegendScroller::offset() const
{
return d_ptr->offset();
}
void LegendScroller::setMoveTreshold(qreal treshold)
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 r2183 {
m_treshold = treshold;
}
sauimone
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 r2197 void LegendScroller::mousePressEvent(QGraphicsSceneMouseEvent *event)
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 r2183 {
sauimone
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 r2197 m_pressPos = event->screenPos();
m_lastPos = m_pressPos;
sauimone
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 r2183 m_state = Pressed;
sauimone
added missing event accept/ignore to handler
 r2187 event->accept();
sauimone
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 r2183 }
sauimone
better implementation of mouse event handling in legend
 r2197 void LegendScroller::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
sauimone
Legend can now handle clicked and do scrolling
 r2183 {
sauimone
fixed mouse event delta handling
 r2188 QPointF delta = event->screenPos() - m_lastPos;
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 r2183
switch (m_state) {
case Pressed: {
// calculate treshold. If enough, change to move state and send out move deltas.
if (qAbs(delta.x()) > m_treshold || qAbs(delta.y()) > m_treshold) {
m_state = Moved;
sauimone
fixed mouse event delta handling
 r2188 m_lastPos = event->screenPos();
sauimone
better implementation of mouse event handling in legend
 r2197 move(delta);
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 r2183 }
sauimone
added missing event accept/ignore to handler
 r2187 event->accept();
sauimone
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 r2183 break;
}
case Moved: {
sauimone
fixed mouse event delta handling
 r2188 m_lastPos = event->screenPos();
sauimone
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 r2197 move(delta);
sauimone
added missing event accept/ignore to handler
 r2187 event->accept();
sauimone
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 r2183 break;
}
case Idle:
default: {
sauimone
added missing event accept/ignore to handler
 r2187 event->ignore();
sauimone
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 r2183 break;
}
}
}
sauimone
better implementation of mouse event handling in legend
 r2197 void LegendScroller::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
sauimone
Legend can now handle clicked and do scrolling
 r2183 {
sauimone
fixed mouse event delta handling
 r2188 m_lastPos = event->screenPos();
sauimone
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 r2183
switch (m_state) {
case Pressed:
{
m_state = Idle;
sauimone
better implementation of mouse event handling in legend
 r2197 QList<QGraphicsItem *> items = scene()->items(event->scenePos());
foreach (QGraphicsItem *i, items) {
if (d_ptr->m_markerHash.contains(i)) {
QLegendMarker *marker = d_ptr->m_markerHash.value(i);
emit marker->clicked();
}
}
sauimone
added missing event accept/ignore to handler
 r2187 event->accept();
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Legend can now handle clicked and do scrolling
 r2183 break;
}
case Moved:
{
sauimone
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 r2197 scrollTo(m_lastPos - m_pressPos);
sauimone
added missing event accept/ignore to handler
 r2187 event->accept();
sauimone
Legend can now handle clicked and do scrolling
 r2183 break;
}
default:
{
m_state = Idle;
sauimone
added missing event accept/ignore to handler
 r2187 event->ignore();
sauimone
Legend can now handle clicked and do scrolling
 r2183 break;
}
}
}
sauimone
better implementation of mouse event handling in legend
 r2197
#include "moc_legendscroller_p.cpp"
sauimone
Legend can now handle clicked and do scrolling
 r2183 QTCOMMERCIALCHART_END_NAMESPACE