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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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// W A R N I N G
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// -------------
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//
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// This file is not part of the QtCommercial Chart API. It exists purely as an
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// implementation detail. This header file may change from version to
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// version without notice, or even be removed.
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//
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// We mean it.
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/*
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Purpose of this class is to resolve what happens during MousePress - MouseMove - MouseRelease event chain.
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Threre can be many MouseMove events and if they all are below our treshold, the result is clicked call.
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If any move event goes over treshold, result will be many moved(QPointF delta) calls,
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where delta is calculated from original position.
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Reason for this is, that legend marker don't know when it should emit clicked and when it should
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allow legend to scroll. We only get this information when some move goes beyond treshold, but
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then it will be too late to let the scroller handle events, because marker is already handling.
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By handling clicked calls in markers and moved calls in scroller, the problem is solved.
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Derived class descides, should the virtual method be implemented as signal or not.
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This could be implemented in LegendMarkerItem, but this way the code is reusable and in one place only.
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*/
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#ifndef MOUSEEVENTHANDLER_H
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#define MOUSEEVENTHANDLER_H
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#include "qchartglobal.h"
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#include <QBasicTimer>
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#include <QTime>
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#include <QPointF>
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class QGraphicsSceneMouseEvent;
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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class MouseEventHandler
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{
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public:
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enum State {
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Idle,
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Pressed,
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Moved,
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Released
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};
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MouseEventHandler();
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virtual ~MouseEventHandler();
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void setMoveTreshold(qreal treshold);
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virtual void mouseClicked() = 0;
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virtual void mouseMoved(const QPointF &delta) = 0;
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virtual void mouseReleased(const QPointF &pos) = 0;
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void handleMousePressEvent(QGraphicsSceneMouseEvent *event);
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void handleMouseMoveEvent(QGraphicsSceneMouseEvent *event);
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void handleMouseReleaseEvent(QGraphicsSceneMouseEvent *event);
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private:
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QPointF m_lastPos;
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State m_state;
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qreal m_treshold;
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};
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QTCOMMERCIALCHART_END_NAMESPACE
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#endif // MOUSEEVENTHANDLER_H
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