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Topic: Keypresses in embedded forms (Read 2628 times)
trayres
Jr. Member
Posts: 92
Keypresses in embedded forms
«
on:
May 01, 2018, 05:53:45 am »
I have a TPageControl; in that PageControl, I have TTabSheets that are embedded forms.
They're created dynamically - so far so good!
But if the TTabSheet form is selected, I'd like to access keypresses and handle them within the logic of the embedded form (that's not as sub-optimal as it sounds: Each of the different tabs can be a totally different form, with responding to different keypresses).
However I don't seem to be able to grab the keypresses. I've tried setting the keypreviews and using 'SetFocus' directly, but still no joy.
I must be missing something; any help is greatly appreciated. Thanks all!
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Handoko
Hero Member
Posts: 5154
My goal: build my own game engine using Lazarus
Re: Keypresses in embedded forms
«
Reply #1 on:
May 01, 2018, 06:33:06 am »
Can you provide a demo source code, which we can compile and test?
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trayres
Jr. Member
Posts: 92
Re: Keypresses in embedded forms
«
Reply #2 on:
May 01, 2018, 05:04:38 pm »
Ok, attached is a very simple example.
If you press 'A', the main form catches it. Cool, as expected.
If you use the menu's only option to add a tabsheet, it embeds a form2 correctly, but I cannot seem to catch keypresses to it!
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Thaddy
Hero Member
Posts: 14373
Sensorship about opinions does not belong here.
Re: Keypresses in embedded forms
«
Reply #3 on:
May 01, 2018, 05:39:45 pm »
Because you have to shift focus to it and you do not ....? Note you need to shift focus to a control that actually can receive focus.
On the keypress event also shift focus.
«
Last Edit: May 01, 2018, 05:41:40 pm by Thaddy
»
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Object Pascal programmers should get rid of their "component fetish" especially with the non-visuals.
Handoko
Hero Member
Posts: 5154
My goal: build my own game engine using Lazarus
Re: Keypresses in embedded forms
«
Reply #4 on:
May 01, 2018, 05:41:32 pm »
@trayres
I tested your code, I saw you put a TForm inside a TTabsheet. That is not the correct thing to do.
Code: Pascal
[Select]
[+]
[-]
procedure
TForm1
.
MenuItem2Click
(
Sender
:
TObject
)
;
var
AForm2
:
TForm2
;
ATabSheet
:
TTabSheet
;
begin
ATabSheet
:
=
TTabSheet
.
Create
(
PageControl1
)
;
AForm2
:
=
TForm2
.
Create
(
ATabSheet
)
;
ATabSheet
.
PageControl
:
=
PageControl1
;
AForm2
.
Align
:
=
alClient
;
AForm2
.
BorderStyle
:
=
bsNone
;
AForm2
.
Parent
:
=
ATabSheet
;
AForm2
.
Show
;
ATabSheet
.
SetFocus
;
end
;
You should use a TFrame. If you don't know how to use it, read here:
http://wiki.freepascal.org/Frames
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Thaddy
Hero Member
Posts: 14373
Sensorship about opinions does not belong here.
Re: Keypresses in embedded forms
«
Reply #5 on:
May 01, 2018, 05:42:45 pm »
That's an even better solution.
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Object Pascal programmers should get rid of their "component fetish" especially with the non-visuals.
trayres
Jr. Member
Posts: 92
Re: Keypresses in embedded forms
«
Reply #6 on:
May 01, 2018, 08:16:36 pm »
It looks like this solves the issue totally and does exactly what I'd like!
Attached is a tiny demo; I added the constructors/destructors per the wiki page so I could initialize local variables.
Is there anything else to watch for in using frames?
Thanks for your help!
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Handoko
Hero Member
Posts: 5154
My goal: build my own game engine using Lazarus
Re: Keypresses in embedded forms
«
Reply #7 on:
May 01, 2018, 08:54:06 pm »
Tested, yes it works but the frame is not having the focus by default (at least on my Linux computer). You should 'force' the form's component to receive focus. You can use:
Code: Pascal
[Select]
[+]
[-]
ActiveControl
.
SelectNext
(
ActiveControl
,
True
,
True
)
;
or
Code: Pascal
[Select]
[+]
[-]
AFrame
.
Button1
.
SetFocus
;
«
Last Edit: May 01, 2018, 09:17:29 pm by Handoko
»
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