lgrZoomableWidget.h

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/******************************************************************************
** Copyright (c) 1992-2010 VT MAK
** All rights reserved.
******************************************************************************/


#ifndef lgrZoomableWidget_H_
#define lgrZoomableWidget_H_

#include "lgrGui.h"
#include "qtFloatMath.h"

#include <QtGui/QWidget>

class QRectF;
class QPoint;
class QRect;

namespace MAKLogger
{
   class DtLgrGuiModel;

   class DT_DLL_LGRGUI DtLgrZoomableWidget : public QWidget
   {
      Q_OBJECT

   public:

      DtLgrZoomableWidget(QWidget* parent);

      virtual ~DtLgrZoomableWidget();

      QRectF scaledViewport(QRect orignalViewport,QPoint margins) const;

      void drawCursor(QPainter& painter, double firstVisibleTime,
         double lastVisibleTime, double cursorTime, int xOffset,bool active);

      QRect cursorBounds(double firstVisibleTime, double lastVisibleTime,
         double cursorTime, int xOffset);

      double firstVisibleTime(double firstTime, double lastTime) const;

      double firstVisibleTime( DtLgrGuiModel& model) const;

      double lastVisibleTime(double firstTime, double lastTime) const;

      double lastVisibleTime( DtLgrGuiModel& model) const;

      float leftOffset()  const { return myLeftOffset;  };

      float rightOffset() const { return myRightOffset; };

      float horizontalMargin() const;

      void setHorizontalMargin(float margin);


      // Called in paint to set the the time use to check if a update is required.
      void setDrawTimes(DtLgrGuiModel& model);

   public slots:
      virtual void setOffsets(float left,float right);

      virtual void testForUpdate(DtLgrGuiModel& model);

   signals:
      void offsetsChanged(float left,float right);

   protected:
      float myLeftOffset;
      float myRightOffset;
      float myHorizontalMargin;
      double myDrawnFirstVisibleTime;
      double myDrawnLastVisibleTime;
      double  myDrawnCurrentVisibleTime;
   };

}

#endif