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Control.invalidate

Invalidates the specified part of the control (adds it to the control's update region, which is the area that will be repainted at the next paint operation), and causes a paint message to be sent to the control.

Syntax

public final void invalidate()

public final void invalidate( Rectangle rc )

public final void invalidate( Region

region )

Parameters

rc

A Rectangle object that represents the area to add to the update region.

region

A Region object that represents the area.

Remarks

Calling this method does not force a synchronous paint; to force a synchronous paint, call the update method after calling the invalidate method. If this method is called with no parameters, the entire client area is added to the update region.