ZXWidgetCanvas.h

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/* **************************************************************************/
#ifndef ZXWIDGET_CANVAS
#define ZXWIDGET_CANVAS
 
#include <functional>
#include "zxecosystem/gui/widgets/ZXWidgetsSimple.h"
#include "zxecosystem/gui/widgets/ZXWidgetSlide.h"
 
 
namespace zxeco
{
 
namespace gui
{
 
/*******************************************************************************
*
*   Class: CanvasWidget
*
*******************************************************************************/
 
 
class CanvasWidget: public ContainerWidget
{
 public:
 
    using DrawCallback = std::function< void(CanvasWidget &) >;
 
 
    CanvasWidget(ID id, const std::string & name,
                 const CharArea & totdims, const CharArea & viewportdims,
                 const DrawCallback & drawcallback,
                 bool movekeys = false, CharDist inchor = 1, CharDist incver =1,
                 const std::string & tooltiptext = "",
                 HorAlign hal = HorAlign::LEFT, 
                 VertAlign val = VertAlign::TOP);
 
    void changeDrawCallback(const DrawCallback & newcbk) 
    
        { viewportshiftcallback_ = newcbk; }
 
    Screen & canvas(void);
 
    CharRect viewport(void) const;
 
    void moveViewport(const CharCursor & corner);
 
    CharCursor maxViewportPos(void) const;
 
    bool eventProcessedByViewport(const CallbackParms & cbp) const noexcept 
 
        { return((cbp.moment == 'A') && 
                 (cbp.whoprocessed != nullptr) &&
                 (cbp.whoprocessed == canvas_)); }
                 
    bool mouseCharPosInViewport(const PointingStatus & mouse, 
                                 CharCursor & relpos) const;
 
    const char * className(void) const noexcept { return("CanvasWidget"); }
    void setTooltip(const std::string & ttt) override
        { canvas_->setTooltip(ttt); }
    const AreaFitting & calcFittingNeeds(const CharArea & area);
    Widget * setDrawingZone(const CharRect & zone);
 
 
 private:
 
    enum Subwidgs {
                    FIRSTCONT = 0,
                    CANVAS,
                    VERTSCROLL,
                    HORIZSCROLL,
                    NUMSUBWIDGETS
                  };
 
    static const ID kIDsSubs[NUMSUBWIDGETS];
 
 
    const bool movekeys_;
    CharArea totdims_;
    DrawCallback viewportshiftcallback_;
    CharCursor cornerviewport_;
    ContainerWidget * firstcont_;
    Widget * canvas_;
    SlideWidget * pvertscroll_;
    SlideWidget * phorizscroll_;
    double oldvalh_,oldvalv_;
 
    std::string scrollStatesInfo(void) const;
    const CharArea areaNeededFor(const CharArea & avail,
                                 bool & vscr, bool & hscr) const;
    void drawRaw(void);
    int processEvent(const EventData & evdata, Widget * who) override;
};
 
 
 
} // end namespace gui
} // end namespace zxeco
 
#endif
 // ZXWidgetCanvas