wsMaximised and Constraints

[petevick]

Could someone explain to me why, when you set the Forms WindowState to wsMaximised in code, at run time any constraints that have been set for the form are ignored, and the form fills the screen, but if use the system min/max icons at run time the constraints are obeyed.

[tetrastes]

Could someone explain to me why, when you set the Forms WindowState to wsMaximised in code, at run time any constraints that have been set for the form are ignored, and the form fills the screen

Cannot confirm at Win10 Laz3.2 fpc 3.2.2. This works as expected:

Code: Pascal  [Select][+][-]

1. unit Unit1;
2.  
3. {$mode objfpc}{$H+}
4.  
5. interface
6.  
7. uses
8.     Classes, SysUtils, Forms, Controls, Graphics, Dialogs, StdCtrls;
9.  
10. type
11.  
12.     { TForm1 }
13.  
14.     TForm1 = class(TForm)
15.         Button1: TButton;
16.         procedure Button1Click(Sender: TObject);
17.     private
18.  
19.     public
20.  
21.     end;
22.  
23. var
24.     Form1: TForm1;
25.  
26. implementation
27.  
28. {$R *.lfm}
29.  
30. { TForm1 }
31.  
32. procedure TForm1.Button1Click(Sender: TObject);
33. begin
34.     WindowState := wsMaximized;
35. end;
36.  
37. end.
38.  

You have to show your code.

[petevick]

Cannot confirm at Win10 Laz3.2 fpc 3.2.2. This works as expected:

Code: Pascal  [Select][+][-]

1. unit Unit1;
2.  
3. {$mode objfpc}{$H+}Thanks for the reply tetrastes.
4.  
5. interface
6.  
7. uses
8.     Classes, SysUtils, Forms, Controls, Graphics, Dialogs, StdCtrls;
9.  
10. type
11.  
12.     { TForm1 }
13.  
14.     TForm1 = class(TForm)
15.         Button1: TButton;
16.         procedure Button1Click(Sender: TObject);
17.     private
18.  
19.     public
20.  
21.     end;
22.  
23. var
24.     Form1: TForm1;
25.  
26. implementation
27.  
28. {$R *.lfm}
29.  
30. { TForm1 }
31.  
32. procedure TForm1.Button1Click(Sender: TObject);
33. begin
34.     WindowState := wsMaximized;
35. end;
36.  
37. end.
38.  

You have to show your code.

Sorry, I should have stated that the issue is in Linux, but I've just tried in Win10 and although any Constraint settings are observed the taskbar is not taken into consideration, so the bottom of the maximised form is hidden behind the taskbar as there is no constraint on the height.

As for code, exactly as you have, WindowState := wsMaximized;.

So to sum up, in Linux WindowState := wsMaximized ignores any constraint settings. In Windows WindowState := wsMaximized observes constraints but ignores the taskbar height. I've doubled checked these results with your code and get the same.

[tetrastes]

Sorry, I should have stated that the issue is in Linux, but I've just tried in Win10 and although any Constraint settings are observed the taskbar is not taken into consideration, so the bottom of the maximised form is hidden behind the taskbar as there is no constraint on the height.

On the contrary, this is due to the constraints, if you set MaxHeight greater than Screen Height - Taskbar Height. And if you set MaxHeight greater than Screen Height, the bottom of form will be invisible at all.