Disabled or Invisible Window can't be FOCUSED
lazarus / 62-General

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Awesome Programmer · 2019-07-23 18:48

I don't understand why I am getting this. I start my program and
program's main window is displayed. I then click on a button that
window to open another window. Except this time the second window is
opened with SHOWMODAL command. The second window pops up with no issue
at all. However, As soon as I close the second modal window and then
click on the main window, I get this DISABLED OR INVISIBLE WINDOW
CAN'T BE SETFOCUS error. Then, my program crashes.

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
... procedure TMainFrm.Button1Click(Sender:TObject);var   
 teststr:string;begin       if SecondFrm.ShowModal=MrOk then         
  teststr:=SecondFrm.Label1.caption;              //This is what I
have been trying and this workaround won't work at all.     
 MainFrm.Enabled:=true;       MainFrm.Visible:=true;     
 MainFrm.ActiveControl:=MainFrm;      end;...

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Thaddy · 2019-07-23 19:18

If a form is modal, you prevent any other form to respond - visually
-. First the modal form has to close . You can set properties for 
other forms, however they will propagate visually once the  modal form
is closed.

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Awesome Programmer · 2019-07-23 19:26

Hi Thaddy

Yes, you are right that the modal form is always the one on the very
top of all the other form. Plus, you wouldn't have access to other
forms until you close the showmodal form. My windows or forms behave
as they should, but when I go back to the main form by first closing
the modal form, I get this error.

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lucamar · 2019-07-23 19:58

Yu shouldn't have that problem unless the second form (the modal one)
is not closing correctly. But in that case your code wouldn't pass
from the
  if SecondFrm.ShowModal=MrOk then ....

Incidentally, this 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  
 MainFrm.Enabled:=true;   MainFrm.Visible:=true; 
 MainFrm.ActiveControl:=MainFrm;shouldn't be necessary. Once the modal
form is closed the focus should revert to the caller wiyhout more ado.
In any case, the usual setting order is:
1) Visible,
2) Enabled (which shouldn't have changed) and
3) ... don't set ActiveControl = form: it's allowed, because a form is
effectively a control, but trying to set focus to a form makes the
form try to "pass the ball" to its "ActiveControl", if set. You can
see where that would lead

There must be soemthing strange going on in your program because
usually all that is needed is something like:
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 procedure
TMainFrm.ButtonClick(Sender: TObject);begin  if not
Assigned(SecondFrm) then    SecondFrm :=
TSecondFrm.Create(Application);  if SecondFrm.ShowModal = mrOK then
begin    {do something};  end;end;
Can you show (or attach) a more complete example?