In This Topic ▼

EndUpdate Method

Summary

Resumes drawing which was disabled by a call to BeginUpdate.

Syntax

C++/CLI

C++

public virtual void EndUpdate()

public: 
virtual void EndUpdate();

public:  
   virtual void EndUpdate()

Remarks

When you want to disable repainting of the viewer, call BeginUpdate.

When you are ready to resume painting call EndUpdate.

Example

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Drawing; 
 
///  
// center the loaded image in the middle of rasterImageViewer if the image smaller than the viewer size  
private void centerImage(RasterImageViewer viewer) 
{ 
   // do center only when RasterViewerSizeMode == Normal 
   if (viewer.SizeMode == RasterPaintSizeMode.Normal) 
   { 
      if (viewer.IsImageAvailable == true) 
      { 
         if (viewer.Image != null) 
         { 
            int viewerWidth = viewer.Right - viewer.Left; 
            int viewerHeight = viewer.Bottom - viewer.Top; 
            int imageWidth = (int)(viewer.LogicalViewRectangle.Width * viewer.ScaleFactor); 
            int imageHeight = (int)(viewer.LogicalViewRectangle.Height * viewer.ScaleFactor); 
 
            if (imageWidth < viewerWidth) 
               viewer.BorderPadding.Left = (viewerWidth - imageWidth) / 2; 
            else 
               viewer.BorderPadding.Left = 0; 
 
            if (imageHeight < viewerHeight) 
               viewer.BorderPadding.Top = (viewerHeight - imageHeight) / 2; 
            else 
               viewer.BorderPadding.Top = 0; 
         } 
      } 
   } 
} 
 
private void viewer_TransformedChanged(object sender, EventArgs e) 
{ 
   RasterImageViewer viewer = sender as RasterImageViewer; 
   string s = string.Format("Transform: {0} {1} {2} {3} {4} {5}", 
      viewer.Transform.Elements[0], 
      viewer.Transform.Elements[1], 
      viewer.Transform.Elements[2], 
      viewer.Transform.Elements[3], 
      viewer.Transform.Elements[4], 
      viewer.Transform.Elements[5]); 
 
   Console.WriteLine(s); 
} 
 
public void RasterImageViewer_BeginUpdate(RasterImageViewer viewer) 
{ 
   viewer.TransformChanged += new EventHandler(viewer_TransformedChanged); 
 
   viewer.BeginUpdate();  // suspend painting of the image  
   viewer.ScaleFactor = viewer.ScaleFactor * 0.9F; 
   centerImage(viewer); 
   viewer.EndUpdate(); // start painting of the image  
 
   viewer.TransformChanged -= new EventHandler(viewer_TransformedChanged); 
}

Requirements

Target Platforms