labeledbutton.h

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/* @@@LICENSE
*
*      Copyright (c) 2011-2012 Hewlett-Packard Development Company, L.P.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
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* LICENSE@@@ */




#ifndef LABELEDBUTTON_H_
#define LABELEDBUTTON_H_

#include "thingpaintable.h"
#include <QRectF>
#include <QRect>
#include <QString>
#include <QColor>
#include <QPointF>
#include <QFont>
#include <QTextLayout>

class PixmapObject;
class LabeledButton : public ThingPaintable
{
        Q_OBJECT
        Q_INTERFACES(QGraphicsItem)

public:
        LabeledButton(const QRectF& buttonGeometry);
        virtual ~LabeledButton();

        virtual bool resize(const QSize& newSize);
        virtual bool resize(quint32 newWidth,quint32 newHeight);

        virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option=0,QWidget *widget=0) = 0;
        virtual void paintOffscreen(QPainter * painter) = 0;

        virtual void setLabel(const QString& v);

protected:

        // PREREQUISITE: m_geom is valid
        // RESULT: m_labelMaxGeom is set
        virtual void recalculateLabelBoundsForCurrentGeom();

        //      PREREQUISITE: m_labelMaxGeom must be valid, at least its size()
        //  RESULT: m_textLayoutObject will have the correct layout, m_labelGeom will be set correctly for the current label,
        virtual void    redoLabelTextLayout();          //run this after the geometry changes. This is absolutely necessary
                                                                                                // ALSO run this after the label changes. don't ask, just do it. Not necessary now, but it most likely will be later

        //      PREREQUISITE: m_geom , m_labelMaxGeom and m_labelGeom are set
        //      RESULT: m_labelPosICS and m_labelPosPntCS are set
        virtual void    recalculateLabelPosition();

        static QFont staticLabelFontForButtons();

protected:

        QString                                 m_label;
        QFont                                   m_textFont;
        QColor                                  m_selectedColor;
        QColor                                  m_unselectedColor;
        QTextLayout                             m_textLayoutObject;
        QPointF                                 m_labelPosICS;                          // position in ICS, and corresponds to m_labelGeom
        QPoint                                  m_labelPosPntCS;                        // same, but precomputed to offscreen painter coords relative to 0,0 at top left
        QRect                                   m_labelMaxGeom;                 // precomputed by recalculateLabelBoundsForCurrentGeom()
        QRect                                   m_labelGeom;                    //precomputed by redoLabelTextLayout(); this one is the CURRENT label's box (always <= m_labelMaxGeom)
};

#endif /* LABELEDBUTTON_H_ */