TNotifiablePersistent

Graphics32

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TNotifiablePersistent

Hierarchy

TPersistent

Description

TNotifiablePersistent extends the standard TPersistent class with change notification events. That is, it provides methods and events allowing its descendants to issue notification on their changes. For example, TBitmap32 uses OnChange to notify its container (usually TImage32 or TBitmapLayer) that it was modified and its data has to be repainted to the screen. TNotifiablePersistent, however, does not use or implement automatic change notification itself. This is done in descendants.

Reference

Properties Methods Events
In TNotifiablePersistent:
UpdateCount BeginUpdate OnChange
Changed
Create
Destroy
EndUpdate

See Also

TBitmap32, TBitmapLayer, TImage32

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