Delphi: How to assign dynamically an event handler without overwriting the existing event handler?
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Published on 2010-12-21T16:38:55Z
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delphi
|event-handling
I need to loop through Components and assign an event handler (for example Dynamically assigning OnClick event for all TButton to
ShowMessage('You clicked on ' + (Sender as TButton).Name);
The problem is that in some cases I alreasy assigned the TButton OnClick event.
Is there a way to solve the problem?
Let's imagine I have Button1 for which the harcoded onclick event handler is:
ShowMessage('This is Button1');
After my "parsing" I would like that the full event handler for Button1 becomes:
ShowMessage('This is Button1'); // design time event handler code
ShowMessage('You clicked on ' + (Sender as TButton).Name); // runtime added
Note: I am looking for a soliution that allows me to use TButton as it is without inheriting from it.
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