[SOLVED] Which DUPLICATE form did I click?
lazarus / 31-LCL

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JCobb · 2018-03-27 07:04

Hello!

I'm writing some code that creates multiple copies of a form at
runtime.   These are duplicates of an existing form listed in the
"auto-create" section of Project Options (in other words I've pre-
built the form and I'm just duplicating it).

Everything I've been doing works great until I click an image object
on one of the forms.  I've no idea which form received the click
event.  As far as the program is concerned all the duplicate forms
have the same name.  I've tried creating forms with different values
in the "tag" property but to no avail.

Keep in mind the image I click is contained in a flowPanel on the
form.

How can I tell which form is receiving the mouse events?

Thanks in Advance.
Jeff

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Thaddy · 2018-03-27 07:57

https://www.freepascal.org/docs-html/rtl/system/tobject.unitname.html
Put that in the onclick event and you will detect from which unit it
comes.
Easy. Unless you put multiple forms in the same unit (bad!) of course.

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Fahmy Rofiq · 2018-03-27 08:07

Duplicate forms always have different names. A number automatically
added on the end of "Name" property. Please look at attachment.

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Thaddy · 2018-03-27 08:12

Quote from: Fahmy Rofiq on March 27, 2018, 10:07:23 amDuplicate forms
always have different names. A number automatically added on the end
of "Name" property. Please look at attachment.

I am afraid that is not  true at all.... You can have unit1.Tform1 and
unit2.Tform1 etc....You can even have multiple instances of the same
form class....(much worse)
So it is better to check the unit name during debugging so you
definitely know where the form is that handles the event. At least you
have a clue then.

Although it is always better to do your naming properly: the question
starts with really, really, extremely bad programming practise of
course. But it IS allowed and possible.

If you need the instance, you can also use
https://www.freepascal.org/docs-html/rtl/system/tobject.equals.html

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Fahmy Rofiq · 2018-03-27 08:27

Quote from: Thaddy on March 27, 2018, 10:12:46 amQuote from: Fahmy
Rofiq on March 27, 2018, 10:07:23 amDuplicate forms always have
different names. A number automatically added on the end of "Name"
property. Please look at attachment.

I am afraid that is not  true at all.... You can have unit1.Tform1 and
unit2.Tform1 etc....You can even have multiple instances of the same
form class....(much worse)
So it is better to check the unit name during debugging so you
definitely know where the form is that handles the event. At least you
have a clue then.

Although it is always better to do your naming properly: the question
starts with really, really, extremely bad programming practise of
course. But it IS allowed and possible.
Yeah, i was thinking that TS just duplicating form object from the
same unit.  So manually handling the name of form could resolve the
problem.
But if TS duplicating the UNIT, thats different story.

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Thaddy · 2018-03-27 08:53

Quote from: Fahmy Rofiq on March 27, 2018, 10:27:28 amBut if TS
duplicating the UNIT, thats different story.
That is also possible... but then the compiler throws a duplicate
identifier error, so he would have known because that will not compile
at all:
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
{%fail}program testpaths;{$mode delphi}uses unit1 in
'/home/pi/somepath/unit1.pas', unit1 in
'/home/pi/someotherpath/unit1.pas';beginend.
Code: Bash  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
testpaths.pas(4,89) Error: Duplicate identifier "UNIT1"

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JCobb · 2018-03-27 15:38

FOUND IT...   To refer to a particular instance of a DUPLICATE form
you use the keyword SELF....

Duh...

I was expecting something like "THIS"...

Thanks for all your help.  Much appreciated (and fast)!

Jeff