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 PixelFormat change does not trigger TImageEnView.OnImageChange		  New Topic  Reply to Topic
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PeterPanino

933 Posts
Posted - Oct 17 2022 :  13:07:00  Show Profile  Reply
I change the PixelFormat of the image in an ImageEnView with this code:

IEGlobalSettings().AutoSetBitDepth := True;
  ImageEnView1.IEBitmap.PixelFormat := ie1g;
  ImageEnView1.Update;
  ShowPixelFormatOnToolbar;


Unfortunately, this does not trigger the OnImageChange Event-Handler!

Is my code incorrect?

xequte

38608 Posts
Posted - Oct 17 2022 :  20:42:11  Show Profile  Reply
Hi Peter

Yes, that is correct. OnImageChange is only called by changes by editing methods in TImageEnProc or in TImageEnView (e.g. TImageEnView.Clear). Not by changes to the TImageEnView.IEBitmap.

Nigel
Xequte Software
www.imageen.com
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PeterPanino

933 Posts
Posted - Oct 18 2022 :  02:44:13  Show Profile  Reply
Hi Nigel

Is that logical? After all, a CHANGE to the TImageEnView.IEBitmap is indeed a CHANGE.

So how can I be notified if something implicitly changes the PixelFormat of the image?
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xequte

38608 Posts
Posted - Oct 18 2022 :  18:41:26  Show Profile  Reply
Hi Peter

Perhaps, but it is not the design intention of the OnImageChange event to handle programmatic modifications to IEBitmap.

There are very few situations PixelFormat is implicitly changed. You can call ImageEnView1.ImageChange( iecsBitmap ) if you change the PixelFormat in your code.

Nigel
Xequte Software
www.imageen.com
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