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 Flash when adding a layer when image having a navigator		  New Topic  Reply to Topic
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esprd

10 Posts
Posted - Jul 08 2025 :  13:14:30  Show Profile  Reply
Hello,

I've got a TImageEnView where I have several layers.

Each time I add a layer, the image "blink" with the "default" new layer :
- adding a ielkImage, a "blank" layer is briefly displayed
- adding a ielkShape iesRectangle, a red ellipse (!) is briefly displayed

To make it simple, it is like there is and Image update withing ImageEnView1.LayersAdd.

This occurs only if I set a navigator for the image.
I tried to add the "ienoDontRefreshSrcIfNavNotFocused" option for SetNavigator, without success.

Is there a way to prevent this ?

I attach a small project repoducing the problem.

Regards,

attach/esprd/202578131341_Test layers - For forum.zip
2967.14 KB

ep

xequte

39097 Posts
Posted - Jul 08 2025 :  21:43:21  Show Profile  Reply
Hi

If you are using a Navigator it will need to update the image to display the view. To prevent this, wrap any "intermediate-state" code in LockUpdate/UnlockUpdate:

  ImageEnView1.LockUpdate();
  ImageEnView1.LayersAdd(iesRectangle,
                         ImageEnView1.Layers[0].PosX,
                         ImageEnView1.Layers[0].PosY,
                         ImageEnView1.Layers[0].Width,
                         ImageEnView1.Layers[0].Height);

  ImageEnView1.Layers[ImageEnView1.LayersCount-1].FillColor := clBlack;
  ImageEnView1.UnlockUpdate();


Nigel
Xequte Software
www.imageen.com
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