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 Trigger OnZoom eventhandlers from Toolbar?		  New Topic  Reply to Topic
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PeterPanino

933 Posts
Posted - Jun 28 2020 :  04:34:59  Show Profile  Reply
It seems that changing the ZOOM from the ImageEnView Toolbar does not trigger the TImageEnView OnZoomIn and OnZoomOut event handlers:



I need this to update a Zoom percentage display:

procedure TformMain.imgMainZoomIn(Sender: TObject; var NewZoom: Double);
begin
  ShowZoom;
end;

procedure TformMain.imgMainZoomOut(Sender: TObject; var NewZoom: Double);
begin
  ShowZoom;
end;

xequte

38611 Posts
Posted - Jun 29 2020 :  00:43:45  Show Profile  Reply
Hi

Please use the OnViewChange event for this. It covers all methods that might affect zoom level.

Nigel
Xequte Software
www.imageen.com
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PeterPanino

933 Posts
Posted - Jun 29 2020 :  11:10:15  Show Profile  Reply
Hi Nigel,

thanks, now it works!

BTW, the UNDO button on the toolbar has only ONE undo-step:



There is no TImageEnView.UndoSteps: Integer property.

I have tried to put this into the FormCreate event-handler:

ImageEnView1.Proc.AutoUndo := True;


But it seems it has no effect.

How can I increase the number of the Toolbar Undo steps to a custom value?
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PeterPanino

933 Posts
Posted - Jun 29 2020 :  11:49:04  Show Profile  Reply
Eureka! This one did the trick:

procedure TformMain.FormCreate(Sender: TObject);
begin
  ImageEnView1.Proc.UndoLimit := 100;
end;
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