invalidate Method


Invalidates a portion of the entire surface of the control and causes the control to be redrawn.


JavaScript Syntax
ImageViewer.prototype.invalidate = function(rc) 
TypeScript Syntax
invalidate(rc: LeadRectD): void; 



Invalidate rectangle in control coordinates. Pass a LeadRectD or a rectangle with 0 width or height to invalidate

the entire surface of the control.


Calling Invalidate will cause the viewer to re-render the content of the view and items. The value of rc will be used as the invalid rectangle used with ImageViewerRenderEventArgs and if it is not empty, only that portion of the viewer will updated.

To re-render a single item quickly, use InvalidateItem or InvalidateItemByIndex.

For more information, refer to Image Viewer Rendering.


Target Platforms

Help Version 19.0.2017.10.27
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Leadtools.Controls Assembly