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Getting the first VISIBLE line-index of a Memo
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Author
Topic: Getting the first VISIBLE line-index of a Memo (Read 4395 times)
justnewbie
Sr. Member
Posts: 292
Getting the first VISIBLE line-index of a Memo
«
on:
April 11, 2018, 06:47:55 pm »
Hi,
Is it possible to get the index of the topmost VISIBLE line of a TMemo component?
If yes, how?
Logged
howardpc
Hero Member
Posts: 4144
Re: Getting the first VISIBLE line-index of a Memo
«
Reply #1 on:
April 11, 2018, 07:14:57 pm »
For a Windows solution see
https://forum.lazarus.freepascal.org/index.php?topic=29667.msg187529#msg187529
Logged
justnewbie
Sr. Member
Posts: 292
Re: Getting the first VISIBLE line-index of a Memo
«
Reply #2 on:
April 11, 2018, 07:40:42 pm »
Thank you! Linux version would be also great.
Logged
justnewbie
Sr. Member
Posts: 292
Re: Getting the first VISIBLE line-index of a Memo
«
Reply #3 on:
April 17, 2018, 01:30:09 pm »
How can I go through a Memo's text character by character?
In other words: I want to get every single string-character from 0 position to the end of the text.
«
Last Edit: April 17, 2018, 01:31:52 pm by justnewbie
»
Logged
Handoko
Hero Member
Posts: 5153
My goal: build my own game engine using Lazarus
Re: Getting the first VISIBLE line-index of a Memo
«
Reply #4 on:
April 17, 2018, 02:13:42 pm »
Quote from: justnewbie on April 17, 2018, 01:30:09 pm
How can I go through a Memo's text character by character?
This works for me:
Code: Pascal
[Select]
[+]
[-]
unit
Unit1
;
{$mode objfpc}{$H+}
interface
uses
Classes
,
SysUtils
,
Forms
,
Controls
,
StdCtrls
;
type
{ TForm1 }
TForm1
=
class
(
TForm
)
Edit1
:
TEdit
;
Label1
:
TLabel
;
Label2
:
TLabel
;
Memo1
:
TMemo
;
procedure
Edit1Change
(
Sender
:
TObject
)
;
end
;
var
Form1
:
TForm1
;
implementation
{$R *.lfm}
{ TForm1 }
procedure
TForm1
.
Edit1Change
(
Sender
:
TObject
)
;
var
Index
:
Integer
;
begin
TryStrToInt
(
Edit1
.
Text
,
Index
)
;
Label2
.
Caption
:
=
''
;
if
(
Index
<
=
0
)
or
(
Index
> Memo1
.
Lines
.
Text
.
Length
)
then
Exit
;
Label2
.
Caption
:
=
'Char #'
+
Index
.
ToString
+
' is '
+
Memo1
.
Text
[
Index
]
;
end
;
end
.
Logged
justnewbie
Sr. Member
Posts: 292
Re: Getting the first VISIBLE line-index of a Memo
«
Reply #5 on:
April 17, 2018, 02:54:58 pm »
@Handoko
: thank you!
Logged
jamie
Hero Member
Posts: 6130
Re: Getting the first VISIBLE line-index of a Memo
«
Reply #6 on:
April 18, 2018, 01:43:05 am »
I would of thought the Windows solution would work since using Messages is a norm for talking to
common controls?
Since these widgets support the common controls don't they also support the messages that go with them?
Logged
The only true wisdom is knowing you know nothing
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Getting the first VISIBLE line-index of a Memo
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