onFormChanged event
lazarus / 10-Designer

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warleyalex · 2018-08-12 22:18

The plan would be to implement an IDE notifier to the Lazarus plugin
IDE project event onFormChanged.

For instance, whenever a form designer has been changed I would like
to fire a method. e.g. You drag 'n drop a TLabel widget into designer,
set the Caption to 'abcd' and then fire the event "onFormChanged".

So, I am stuck on this plan.

Any idea is very welcome.

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warleyalex · 2018-08-13 14:53

Every designed LCL form has a Designer of type TIDesigner. The IDE
creates designers of type TComponentEditorDesigner defined in the
IDEIntf unit componenteditors.

You get notified when a designer form is modified with this piece of
code:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
GlobalDesignHook.AddHandlerModified(@Extension.OnDesignerModified); 
...but there is an issue here:
the designer is notified using only the Object Inspector!

Important note:
when you resize a component at design-time, you resize with the mouse,
dragging the component, the designer is not notified!

Any idea?

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warleyalex · 2018-08-13 17:13

I'll share you guys the solution.

...the problem of the method AddHandlerModified is triggered after
little change, for instance, if I set the WebLabel caption to 'abc'
the method is fired 3 times. This is unwanted. I only want to trigger
on form save.

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
GlobalDesignHook.AddHandlerModified(@Extension.OnDesignerModified); 
I found the undocumented method AddHandlerOnSaveEditorFile. We can
fire the method LFM-TO-PAS "on before save" the form unit.

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i LazarusIDE.
AddHandlerOnSaveEditorFile(@Extension.BeforeSaveCallLFM2PAS); 
Do not forget to use RemoveHandlerOnSaveEditorFile on the add-on the
destructor.

This is the trick!