legato_widget_drawsurface.h

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/*******************************************************************************
 Module for Microchip Graphics Library - Legato User Interface Library
 
  Company:
    Microchip Technology Inc.
 
  File Name:
    legato_widget_drawsurface.h
 
  Summary:
 
 
  Description:
    This module implements surface container drawing functions.
*******************************************************************************/
 
#ifndef LEGATO_DRAWSURFACE_H
#define LEGATO_DRAWSURFACE_H
 
#include "gfx/legato/common/legato_common.h"
 
#if LE_DRAWSURFACE_WIDGET_ENABLED
 
#include "gfx/legato/widget/legato_widget.h"
 
typedef struct leDrawSurfaceWidget leDrawSurfaceWidget;
 
// *****************************************************************************
/* Function Pointer:
    leDrawSurfaceWidget_DrawCallback
 
  Summary:
    Draw surface draw event function callback type
*/
typedef leBool (*leDrawSurfaceWidget_DrawCallback)(leDrawSurfaceWidget* sfc,
                                                   leRect* bounds);
 
// *****************************************************************************
// *****************************************************************************
// Section: Data Types and Constants
// *****************************************************************************
// *****************************************************************************
 
/* internal use only */
typedef struct leDrawSurfaceWidget leDrawSurfaceWidget;
 
#define LE_DRAWSURFACEWIDGET_VTABLE(THIS_TYPE) \
    LE_WIDGET_VTABLE(THIS_TYPE) \
    \
    leDrawSurfaceWidget_DrawCallback (*getDrawCallback)(const THIS_TYPE* _this); \
    leResult  (*setDrawCallback)(THIS_TYPE* _this, leDrawSurfaceWidget_DrawCallback cb); \
    
typedef struct leDrawSurfaceWidgetVTable
{
    LE_DRAWSURFACEWIDGET_VTABLE(leDrawSurfaceWidget)
} leDrawSurfaceWidgetVTable; 
 
// *****************************************************************************
/* Structure:
    leDrawSurfaceWidget
 
  Summary:
    Implementation of a Drawsurface widget.
 
  Description:
    A draw surface widget is a special widget that allows an application to
    perform custom HAL draw calls during Legato's paint loop.  To use, create
    and add a draw surface widget to the desired place in the widget tree.
    Then register for the callback through the API
    'leDrawSurfaceWidget_SetDrawCallback'.  This callback occurs during the
    paint loop.  The application should then be free to adjust the HAL
    draw state and issue draw calls as desired.  The HAL layer, buffer, or
    context state must not be adjusted in any way.
 
    It is also important to not stall for too long during the draw callback.
 
  Remarks:
    None.
*/
 
typedef struct leDrawSurfaceWidget
{
    leWidget widget; // the widget base class
 
    const leDrawSurfaceWidgetVTable* fn;
 
    leDrawSurfaceWidget_DrawCallback cb; // the draw callback
} leDrawSurfaceWidget;
 
// *****************************************************************************
// *****************************************************************************
// Section: Routines
// *****************************************************************************
// *****************************************************************************
 
LIB_EXPORT leDrawSurfaceWidget* leDrawSurfaceWidget_New();
 
LIB_EXPORT void leDrawSurfaceWidget_Constructor(leDrawSurfaceWidget* sfc);
// *****************************************************************************
 
#ifdef _DOXYGEN_
#define THIS_TYPE struct leWidget
 
// *****************************************************************************
virtual leDrawSurfaceWidget_DrawCallback getDrawCallback(const leDrawSurfaceWidget* _this);
 
// *****************************************************************************
virtual leResult setDrawCallback(leDrawSurfaceWidget* _this,
                                 leDrawSurfaceWidget_DrawCallback cb);
 
#undef THIS_TYPE
#endif
 
#endif // LE_DRAWSURFACE_WIDGET_ENABLED
#endif /* LEGATO_DRAWSURFACE_H */