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Can MDI child be minimized to an ICON?

Posted on 1998-10-19
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Last Modified: 2010-04-06
Hi,

Can you minimize a MDI child form to an Icon rather than just a small form caption bar??

If it is easy just say yes, but if it requires some complicated inheritance and changing of the basic code of a Form then please supply code with answer.  (* I will increase the points if it turns out to be more difficult than it sounds *).
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Question by:Zonnald
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Thaddy earned 20 total points
ID: 1343331
Yes it's possible and no, it's not easy.
If you use Windows NT 3.51, it's easy enough, just don't do anything.(About win 3.51 look)
It's because the implementaion has changed in  NT 4 and Win 95 that this behaveour has changed.
First you have to remove the bar:
That's easy enough here's an example

procedure TForm2.FormResize(Sender: TObject);
begin
  //Mdi child close *without* titlebar
  if windowstate=wsMinimized then
  if ShowWindow(Self.Handle, SW_HIDE)=true then
   //in Real life you would create this dynamically,
and add code to do an 'Arrange Icon'
  form1.image1.picture.Assign(self.icon);
end;

The doubleclickhandler for the Image should read:
{You can lookup the MDIchild in ther MdiChildren list}
procedure TForm1.Image1DblClick(Sender: TObject);
begin
//This is for one mdichild only, but you can expand the imagelist
//With a property 'AssociatedChild' or something
      SetWindowPos(form2.Handle, HWND_TOP, 0, 0, 0, 0, SWP_NOMOVE OR
         SWP_NOSIZE OR SWP_SHOWWINDOW);
       Windows.SetFocus(Form2.Handle);
end;

Although by no means complete, that's a way to do it.
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Expert Comment

by:rwilson032697
ID: 1343332
Um.. I'n confused. What is the role of 'form1' in the resize event?

(I agree, Mickeysoft changed the way they do things between 3.1 and 95/NT (4.00). We had the same issue but gave up and did it another way...)
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Author Comment

by:Zonnald
ID: 1343333
Thaddy

Works Ok!


I see that Form1 (nb rw) would be your main form - you need to so that you have somewhere to display the image. have a panel to see the image. I made the image a Dockable object and the panel a dock site and had some fun being able to move it around with out having to make any mouse event code.

It is also interesting that as you have coded it, this works when you hit the X but not actually when you hit minimize icon?



Thanks

Zonnald.
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Expert Comment

by:Thaddy
ID: 1343334
This behaveour is expected: Minimizing ain't closing :)
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