Graphics32

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GR32_Backends🞂IUpdateRectSupportInterface

IUpdateRectSupport

Interface for querying window update regions and invalidating control areas.

Declaration ​

pascal
IUpdateRectSupport = interface(IUnknown)

Description ​

IUpdateRectSupport provides control invalidation and update region retrieval routines for GUI controls (TWinControl).

Methods ​

InvalidateRect ​

pascal
procedure InvalidateRect(AControl: TWinControl; const ARect: TRect);

Invalidates a specific rectangular region ARect of AControl, triggering a repaint.

GetUpdateRects ​

pascal
procedure GetUpdateRects(AControl: TWinControl; AUpdateRects: TRectList; AReservedCapacity: integer; var AFullUpdate: boolean);

Queries the operating system update region for AControl and populates AUpdateRects with individual bounding rectangles. Sets AFullUpdate to True if a full control repaint is required.