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Runtime TLabel not shown as child
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Topic: Runtime TLabel not shown as child (Read 2115 times)
tudi_x
Hero Member
Posts: 532
Runtime TLabel not shown as child
«
on:
August 31, 2017, 06:13:37 pm »
hi All,
i am creating a label during runtime as per the below but i cannot see it listed as child of self although i have created it with self as parent.
please advise what i am missing.
Code: Pascal
[Select]
[+]
[-]
procedure
TForm1
.
Button1Click
(
Sender
:
TObject
)
;
var
i
:
integer
;
begin
l
:
=
TLabel
.
Create
(
self
)
;
l
.
Caption
:
=
'xxxxxxxxxxxxxxxxxxx'
;
l
.
Visible
:
=
true
;
l
.
Parent
:
=
self
;
for
i
:
=
0
to
self
.
ControlCount
-
1
do
begin
Memo1
.
Append
(
self
.
Controls
[
i
]
.
Name
)
;
end
;
end
;
thank you
Lazarus 1.8RC4 64b
Logged
Lazarus 2.0.2 64b on Debian LXDE 10
Handoko
Hero Member
Posts: 5131
My goal: build my own game engine using Lazarus
Re: Runtime TLabel not shown as child
«
Reply #1 on:
August 31, 2017, 06:33:52 pm »
Actually it is there, you just can't see it because its name is nothing/empty.
Try to add:
Code: Pascal
[Select]
[+]
[-]
l
.
Name
:
=
'Hello'
;
Logged
tudi_x
Hero Member
Posts: 532
Re: Runtime TLabel not shown as child
«
Reply #2 on:
August 31, 2017, 06:44:11 pm »
thank you Handoko.
would you know who is actually doing the magic when you create the same label from the IDE?
i thought there is some inheritance like some other attributes, example autosize in the constructor for the runtime label also.
Logged
Lazarus 2.0.2 64b on Debian LXDE 10
Handoko
Hero Member
Posts: 5131
My goal: build my own game engine using Lazarus
Re: Runtime TLabel not shown as child
«
Reply #3 on:
August 31, 2017, 07:16:59 pm »
Newly created components (usually) do not have name, but if you use the form editor it will automatically generate a name for them.
One great thing about open source project is you can study the code. I looked into the IDE and I found the code that is responsible for the name creation. It is in CustomFormEditor.pas line #2263:
Code: Pascal
[Select]
[+]
[-]
function
TCustomFormEditor
.
CreateUniqueComponentName
(
const
AClassName
:
string
;
OwnerComponent
:
TComponent
)
:
string
;
var
i
,
j
:
integer
;
begin
Result
:
=
AClassName
;
if
(
OwnerComponent
=
nil
)
or
(
Result
=
''
)
then
exit
;
i
:
=
1
;
while
true
do
begin
j
:
=
OwnerComponent
.
ComponentCount
-
1
;
Result
:
=
ClassNameToComponentName
(
AClassName
)
;
if
Result
[
length
(
Result
)
]
in
[
'0'
..
'9'
]
then
Result
:
=
Result
+
'_'
;
Result
:
=
Result
+
IntToStr
(
i
)
;
while
(
j>
=
0
)
and
(
CompareText
(
Result
,
OwnerComponent
.
Components
[
j
]
.
Name
)
<>
0
)
do
dec
(
j
)
;
if
j<
0
then
exit
;
inc
(
i
)
;
end
;
end
;
Logged
RAW
Hero Member
Posts: 868
Re: Runtime TLabel not shown as child
«
Reply #4 on:
August 31, 2017, 09:15:33 pm »
Code: Pascal
[Select]
[+]
[-]
Procedure
TForm1
.
FormClick
(
Sender
:
TObject
)
;
Var
lab
:
TLabel
;
Begin
lab
:
=
TLabel
.
Create
(
Self
)
;
lab
.
Caption
:
=
'Hello World...'
;
lab
.
Parent
:
=
Self
;
End
;
Procedure
TForm1
.
Button1Click
(
Sender
:
TObject
)
;
Var
i
,
iCounter
:
Integer
;
Begin
iCounter
:
=
1
;
For
i
:
=
0
To
ControlCount
-
1
Do
Begin
If
Controls
[
i
]
Is TLabel
Then
Begin
If
TLabel
(
Controls
[
i
]
)
.
Name
=
''
Then
Begin
Memo1
.
Lines
.
Add
(
'Label'
+
IntToStr
(
iCounter
)
)
;
Inc
(
iCounter
)
;
End
Else
Memo1
.
Lines
.
Add
(
TLabel
(
Controls
[
i
]
)
.
Name
)
;
End
;
End
;
End
;
...just kidding....
Logged
Windows 7 Pro (x64 Sp1) & Windows XP Pro (x86 Sp3).
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Runtime TLabel not shown as child
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