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plug-ins!


NPN_InvalidateRegion


Invalidates specified drawing region prior to repainting or refreshing a windowless plug-in.

Syntax

#include <npapi.h>
 
void NPN_InvalidateRegion(NPP instance, 
 
                          NP_Region invalidRegion);
 

Parameters

The function has the following parameters:

instance
 
Pointer to the current plug-in instance.
invalidRegion
 
The area to invalidate, specified in a coordinate system that originates at the top left of the plug-in.

Description

Before a windowless plug-in can repaint or refresh part of its drawing area, the plug-in must first invalidate the area with either NPN_InvalidateRect or NPN_InvalidateRegion.

NPN_InvalidateRegion causes the NPP_HandleEvent method to pass an update event or a paint message to the plug-in. If a plug-in calls this method, it receives a paint message later. The browser redraws invalid areas of the document and windowless plug-ins at regularly timed intervals. To force a paint message, the plug-in can call NPN_ForceRedraw after calling this method.

See Also

NPN_ForceRedraw, NPN_InvalidateRect, NP_Region, NPP
 


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