Lazarus
Home
Help
TinyPortal
Search
Login
Register
Lazarus
»
Forum
»
Programming
»
LCL
»
[SOLVED] Undoing text editing in TEdit, etc.
Free Pascal
Website
Downloads
Wiki
Documentation
Bugtracker
Mailing List
Lazarus
Website
Downloads (Laz+FPC)
Packages (OPM)
FAQ
Wiki
Documentation (RTL/FCL/LCL)
Bugtracker
CCR Bugs
IRC channel
GIT
Mailing List
Other languages
Foundation
Website
Useful Wiki Links
Project Roadmap
Getting the Source
Screenshots
How to use the forum
About donations (wiki)
Bookstore
Computer Math and Games in Pascal
(preview)
Lazarus Handbook
Search
Advanced search
Recent
Parameter passing odditie...
by
KodeZwerg
[
Today
at 11:04:39 pm]
Can function be used for ...
by
jamie
[
Today
at 10:53:10 pm]
(Solved) TIndexedAVLTree ...
by
lainz
[
Today
at 10:49:03 pm]
Demo Scene Picture sinwav...
by
KodeZwerg
[
Today
at 10:26:21 pm]
fkInternalCalc
by
zraja
[
Today
at 09:31:07 pm]
A fairly simple sound sol...
by
KodeZwerg
[
Today
at 09:23:37 pm]
add new targets to make
by
marcov
[
Today
at 08:38:42 pm]
how to tweek fpmake to co...
by
marcov
[
Today
at 08:29:16 pm]
Quirky windows
by
ASerge
[
Today
at 07:07:16 pm]
[Request] Demo Scene Sub ...
by
Gigatron
[
Today
at 06:29:39 pm]
Unlocking Files
by
KodeZwerg
[
Today
at 06:03:08 pm]
[SOLVED] trunk bug for mi...
by
Key-Real
[
Today
at 05:56:32 pm]
Demo Scene Bitmap Font Sc...
by
Gigatron
[
Today
at 05:56:27 pm]
Compile/Convert Delphi pr...
by
Martin_fr
[
Today
at 05:43:11 pm]
Generics - correct syntax
by
Thaddy
[
Today
at 05:40:59 pm]
Lazarus for Windows on aa...
by
msintle
[
Today
at 05:32:42 pm]
InstallAware Using Lazaru...
by
msintle
[
Today
at 05:26:36 pm]
Xcode Command Line Tools ...
by
Joseph
[
Today
at 05:16:39 pm]
Offical launch of the 1 B...
by
Hartmut
[
Today
at 04:49:29 pm]
what to do if my target M...
by
nickysn
[
Today
at 04:16:02 pm]
compiler error in unit
by
paule32
[
Today
at 03:49:50 pm]
Multithreading - synchron...
by
mika
[
Today
at 01:48:51 pm]
May be useful to somebody
by
KodeZwerg
[
Today
at 12:38:22 pm]
match automatic highlight...
by
Чебурашка
[
Today
at 11:35:14 am]
Tchart with dual numbers ...
by
wp
[
Today
at 10:48:18 am]
« previous
next »
Print
Pages: [
1
]
Author
Topic: [SOLVED] Undoing text editing in TEdit, etc. (Read 931 times)
egsuh
Hero Member
Posts: 1296
[SOLVED] Undoing text editing in TEdit, etc.
«
on:
September 18, 2019, 11:48:52 am »
Is it possible to undo editings in TEdit, etc.?
For example, the original Edit1.Text = 'Edit1'. And I tried to change some part of it, but I want to leave the EditBox just leaving the original 'Edit1' text, ignoring my own changes?
«
Last Edit: September 18, 2019, 12:13:33 pm by egsuh
»
Logged
wp
Hero Member
Posts: 11923
Re: Undoing text editing in TEdit, etc.
«
Reply #1 on:
September 18, 2019, 12:07:07 pm »
Press ESC to restore the original content. I think it is not ready-made, but you can easily add it by yourself:
Add a string variable to the form named FOldEdit1Text
Write a handler for Edit1's OnEnter event copying is Text to FOldEdit1Text.
Write a handler for Edit1's OnKeyDown event checking the pressed key for ESCAPE and replacing the Text by FOldEdit1Text.
Code: Pascal
[Select]
[+]
[-]
unit
Unit1
;
{$mode objfpc}{$H+}
interface
uses
Classes
,
SysUtils
,
Forms
,
Controls
,
Graphics
,
Dialogs
,
StdCtrls
;
type
{ TForm1 }
TForm1
=
class
(
TForm
)
Edit1
:
TEdit
;
Edit2
:
TEdit
;
procedure
Edit1Enter
(
Sender
:
TObject
)
;
procedure
Edit1KeyDown
(
Sender
:
TObject
;
var
Key
:
Word
;
Shift
:
TShiftState
)
;
procedure
Edit2Enter
(
Sender
:
TObject
)
;
procedure
Edit2KeyDown
(
Sender
:
TObject
;
var
Key
:
Word
;
Shift
:
TShiftState
)
;
private
FOldEdit1Text
:
String
;
FOldEdit2Text
:
String
;
public
end
;
var
Form1
:
TForm1
;
implementation
{$R *.lfm}
uses
LCLType
;
{ TForm1 }
procedure
TForm1
.
Edit1Enter
(
Sender
:
TObject
)
;
begin
FOldEdit1Text
:
=
Edit1
.
Text
;
end
;
procedure
TForm1
.
Edit1KeyDown
(
Sender
:
TObject
;
var
Key
:
Word
;
Shift
:
TShiftState
)
;
begin
if
Key
=
VK_ESCAPE
then
begin
Edit1
.
Text
:
=
FOldEdit1Text
;
Edit1
.
SelectAll
;
Key
:
=
0
;
end
;
end
;
procedure
TForm1
.
Edit2Enter
(
Sender
:
TObject
)
;
begin
FOldEdit2Text
:
=
Edit2
.
Text
;
end
;
procedure
TForm1
.
Edit2KeyDown
(
Sender
:
TObject
;
var
Key
:
Word
;
Shift
:
TShiftState
)
;
begin
if
Key
=
VK_ESCAPE
then
begin
Edit2
.
Text
:
=
FOldEdit2Text
;
Edit2
.
SelectAll
;
Key
:
=
0
;
end
;
end
;
end
.
Logged
egsuh
Hero Member
Posts: 1296
Re: Undoing text editing in TEdit, etc.
«
Reply #2 on:
September 18, 2019, 12:13:06 pm »
@wp
I see. The function is not built-in. Writing such codes is not big deal.
Logged
Print
Pages: [
1
]
« previous
next »
Lazarus
»
Forum
»
Programming
»
LCL
»
[SOLVED] Undoing text editing in TEdit, etc.
TinyPortal
© 2005-2018