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/***************************************************************************
* Copyright (C) 2008 by Fredrik Höglund <[email protected]> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
***************************************************************************/
#ifndef KTOOLTIPDELEGATE_H
#define KTOOLTIPDELEGATE_H
#include <QFontMetrics>
#include <QFont>
#include <QObject>
#include <QPalette>
#include <QRect>
#include <QStyle>
#include <QSize>
class KStyleOptionToolTip;
class KToolTipItem;
class QPainter;
class QRegion;
class KStyleOptionToolTip
{
public:
KStyleOptionToolTip();
enum Corner { TopLeftCorner, TopRightCorner, BottomLeftCorner, BottomRightCorner, NoCorner };
Qt::LayoutDirection direction;
QFontMetrics fontMetrics;
QPalette palette;
QRect rect;
QStyle::State state;
QFont font;
QSize decorationSize;
Corner activeCorner;
};
/**
* KToolTipDelegate is responsible for providing the size hint and
* painting the tooltips.
*/
class KToolTipDelegate : public QObject
{
Q_OBJECT
public:
KToolTipDelegate();
virtual ~KToolTipDelegate();
virtual QSize sizeHint(const KStyleOptionToolTip &option, const KToolTipItem &item) const;
/**
* If haveAlphaChannel() returns true, the paint device will be filled with
* Qt::transparent when this function is called, otherwise the content is
* undefined.
*/
virtual void paint(QPainter *painter,
const KStyleOptionToolTip &option,
const KToolTipItem &item) const;
/**
* Reimplement this function to specify the region of the tooltip
* that accepts input. Any mouse events that occur outside this
* region will be sent to the widget below the tooltip.
*
* The default implementation returns a region containing the
* bounding rect of the tooltip.
*
* This function will only be called if haveAlphaChannel()
* returns true.
*/
virtual QRegion inputShape(const KStyleOptionToolTip &option) const;
/**
* Reimplement this function to specify a shape mask for the tooltip.
*
* The default implementation returns a region containing the
* bounding rect of the tooltip.
*
* This function will only be called if haveAlphaChannel()
* returns false.
*/
virtual QRegion shapeMask(const KStyleOptionToolTip &option) const;
protected:
/**
* Returns true if the tooltip has an alpha channel, and false
* otherwise.
*
* Implementors should assume that this condition may change at
* any time during the runtime of the application, as compositing
* can be enabled or disabled in the window manager.
*/
bool haveAlphaChannel() const;
};
#endif
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