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[SOLVED] Signalize from object to main form
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Author
Topic: [SOLVED] Signalize from object to main form (Read 2891 times)
tudi_x
Hero Member
Posts: 532
[SOLVED] Signalize from object to main form
«
on:
September 21, 2017, 05:42:17 pm »
hi All,
as per attached i need to signalize when edit completed so i can move to next screen.
is it possible to produce an event inside the screen 1 object that would trigger procedure in main form?
thank you
Lazarus 1.8RC4 , cross platform
Code: Pascal
[Select]
[+]
[-]
unit
screen_1
;
{$mode objfpc}{$H+}
interface
uses
Classes
,
SysUtils
,
Forms
,
ExtCtrls
,
Graphics
,
Controls
,
StdCtrls
;
type
TScreen1
=
class
private
E1
:
TEdit
;
procedure
FinishInput
(
ASender
:
TObject
)
;
public
constructor
Create
(
AParent
:
TCustomForm
)
;
procedure
IsVisible
(
AVisible
:
boolean
)
;
end
;
implementation
constructor
TScreen1
.
Create
(
AParent
:
TCustomForm
)
;
begin
E1
:
=
TEdit
.
Create
(
AParent
)
;
E1
.
OnChange
:
=
@
FinishInput
;
//hook the check
E1
.
Text
:
=
'screen 1'
;
E1
.
Visible
:
=
False
;
E1
.
Parent
:
=
AParent
;
end
;
procedure
TScreen1
.
IsVisible
(
AVisible
:
boolean
)
;
begin
E1
.
Visible
:
=
AVisible
;
end
;
procedure
TScreen1
.
FinishInput
(
ASender
:
TObject
)
;
begin
if
E1
.
Text
=
'x'
then
begin
//signalize to switch to screen 2 - to run ShowScreen2
end
;
end
;
end
.
«
Last Edit: September 22, 2017, 09:16:25 am by tudi_x
»
Logged
Lazarus 2.0.2 64b on Debian LXDE 10
howardpc
Hero Member
Posts: 4144
Re: Signalize from object to main form
«
Reply #1 on:
September 21, 2017, 06:22:59 pm »
You are already using the edit's OnChange event for this.
So you can do what you want much more simply as in the attached project (if I've understood what you are after).
Logged
tudi_x
Hero Member
Posts: 532
Re: Signalize from object to main form
«
Reply #2 on:
September 21, 2017, 06:32:00 pm »
thank you but i need to stick with the objects.
please advise if it is possible to call from the (GUI) objects the main form or this is bad design.
worst case scenario i would convert the units to .inc files so they are friendly classes.
«
Last Edit: September 21, 2017, 06:40:17 pm by tudi_x
»
Logged
Lazarus 2.0.2 64b on Debian LXDE 10
howardpc
Hero Member
Posts: 4144
Re: Signalize from object to main form
«
Reply #3 on:
September 21, 2017, 07:57:50 pm »
If you want to use the objects you create, then you must free them correctly.
The standard way to communicate is via an event.
See the attached project which adds a suitable event and frees all the created instances.
Logged
tudi_x
Hero Member
Posts: 532
Re: Signalize from object to main form
«
Reply #4 on:
September 22, 2017, 09:16:11 am »
i will use the notify event for all my screens.
thank you very much
Logged
Lazarus 2.0.2 64b on Debian LXDE 10
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[SOLVED] Signalize from object to main form
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