This reference page is linked to from the following overview topics: Methods and Classes of Custom Controls.

Detailed Description

Description:: This control provides an off screen buffer which the developer may draw into, then quickly blit onto the actual display for flicker free image updates.

To initialize the pointer to the control call:

#include <custcont.h>

Inheritance diagram for IOffScreenBuf:

Constructor & Destructor Documentation

virtual ~IOffScreenBuf ( ) [inline, virtual]

{;}

virtual HDC GetDC ( ) [pure virtual]

Remarks:: Returns a handle to the display device context (DC) for the off screen buffer. The display device context can be used in subsequent GDI functions to draw in the buffer.

virtual void Erase ( Rect * rct = NULL ) [pure virtual]

Parameters:: Rect *rct=NULL

Specifies the rectangular region to erase. If NULL the entire buffer is erased.

virtual void Blit ( Rect * rct = NULL ) [pure virtual]

Remarks:: This method blits (transfers the image from) the buffer to the display.

Parameters:: Rect *rct=NULL

Specifies the rectangular region to blit. If NULL the entire buffer is blitted.

virtual void Resize ( ) [pure virtual]

virtual void SetBkColor ( COLORREF color ) [pure virtual]

Parameters:: COLORREF color

The color to set. You may use the RGB macro to set the color.

virtual COLORREF GetBkColor ( ) [pure virtual]