Multiple frames on single form
lazarus / 31-LCL

----------------------------------------------------------------------
hakelm · 2022-01-29 10:44

I have a frame, Ttpropertiesframe and try to place several different
and independent instances on the same form with:
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  
properties1:=Ttpropertiesframe.Create(self); 
properties1.Parent:=self;  
properties2:=Ttpropertiesframe.Create(self); 
properties2.Parent:=self; 
properties2.Left:=properties1.Left+properties1.Width; 
this compiles nicely but when run I get the exception:

Project imgcat raised exception class 'EComponentError' with message:
Duplicate name: A component named "tpropertiesframe" already exists

Why is this so, aren't the different frames just variables of the same
type derived from TComponent?
H

----------------------------------------------------------------------
MarkMLl · 2022-01-29 11:05

Why are you trying to do it manually rather than using the IDE?

MarkMLl

----------------------------------------------------------------------
hakelm · 2022-01-29 11:15

Because I would like to have a little procedure that with a click
places around 10 of these frames similar but equipped with different
data on a form
H

----------------------------------------------------------------------
wp · 2022-01-29 12:06

Yes. The TAChart demo "charteditor" makes massive use of frames, and I
saw the same issue when writing this. The problem is that a frame
inserted at runtime does get a Name value equal to the class name by
default (I consider this to be a bug...). Without the automatic name
generation of the Lazarus designtime mode, therefore, two frames of
the same type have a name collision, and this must not happen.

So, jamie's idea to reset the Name to an empty string after creation
of each frame is the correct solution.

----------------------------------------------------------------------
hakelm · 2022-01-29 12:31

Thanks, explanations are as far as I can understand correct, but I
can't set the owner since it is read only.
I made this little workaround that seems to be working, at least are
the subcomponents destructors called on destruction:
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  
c:tcomponent;................   c:=tcomponent.Create(self); 
properties1:=Ttpropertiesframe.Create(c);  properties1.Parent:=self;  
c:=tcomponent.Create(self); 
properties2:=Ttpropertiesframe.Create(c);  properties2.Parent:=self; 
properties2.Left:=properties1.Left+properties1.Width;  H

----------------------------------------------------------------------
Jorg3000 · 2022-01-29 12:59

You don't need to do something with the Owner.
Simply set .Name:=''; after the Create.
That will do it.
So there will be no name collision at the next create.

----------------------------------------------------------------------
hakelm · 2022-01-29 13:19

Thanks, you are right.
H