invalidate Method

Summary

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

Syntax

JavaScript Syntax

ImageViewer.prototype.invalidate = function(rc)

TypeScript Syntax

invalidate(rc: LeadRectD): void;

Parameters

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

the entire surface of the control.

Remarks

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.

Requirements

Target Platforms

Reference

ImageViewer Class

ImageViewer Members

Leadtools.Controls Namespace

Help Version 19.0.2017.10.27

Leadtools.Controls Assembly

Introduction

Getting Started

Namespaces

Leadtools.Controls Namespace

Assemblies