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[SOLVED] ListBox out of bounds
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Topic: [SOLVED] ListBox out of bounds (Read 2226 times)
trev
Global Moderator
Hero Member
Posts: 2023
Former Delphi 1-7, 10.2 user
[SOLVED] ListBox out of bounds
«
on:
August 27, 2019, 08:11:41 am »
I have a listbox which is filled with items. If I clear the items, I get a "List index (-1) out of bounds" error only if an item has been selected. So I tried unsetting ItemIndex but no joy.
Code: Pascal
[Select]
[+]
[-]
picListBox
.
ClearSelection
;
picListBox
.
ItemIndex
:
=
-
1
;
ShowMessage
(
'1'
)
;
picListBox
.
Items
.
Clear
;
ShowMessage
(
'2'
)
;
Ideas?
«
Last Edit: August 28, 2019, 08:18:54 am by trev
»
Logged
skalogryz
Global Moderator
Hero Member
Posts: 2770
Re: ListBox out of bounds
«
Reply #1 on:
August 27, 2019, 07:51:59 pm »
please try r61760 (the problem seemed to be with TListBox not clearing selections)
BUT,. if it doesn't work, please provide a sample. I couldn't replicate the issue on a standalone project. (With TListBox and TButton calling for ListBox1.Clear).
«
Last Edit: August 28, 2019, 01:03:17 am by skalogryz
»
Logged
trev
Global Moderator
Hero Member
Posts: 2023
Former Delphi 1-7, 10.2 user
Re: ListBox out of bounds
«
Reply #2 on:
August 28, 2019, 03:21:16 am »
The out of bounds error has moved
Code: Pascal
[Select]
[+]
[-]
ShowMessage
(
'1'
)
;
picListBox
.
ClearSelection
;
ShowMessage
(
'ItemIndex = '
+
IntToStr
(
picListBox
.
ItemIndex
)
)
;
picListBox
.
Items
.
Clear
;
It used to occur at picListBox.Items.Clear but with r61769 it now occurs at picListBox.ClearSelection which does now clear the selection.
Error dialog attached.
I'll work on a minimal demo.
Logged
trev
Global Moderator
Hero Member
Posts: 2023
Former Delphi 1-7, 10.2 user
Re: ListBox out of bounds
«
Reply #3 on:
August 28, 2019, 04:13:16 am »
I'm having trouble replicating it in a standalone app.
In the real app if I comment out the picListBox.ClearSelection the error still occurs at picListBox.Items.Clear and if I comment that out it occurs at picListBox.Items.Assign(List).
If there is no highlighted selection, then the error does not occur.
I'll keep trying to replicate in a standalone app or resort to deconstructing the real app.
«
Last Edit: August 28, 2019, 04:15:36 am by trev
»
Logged
skalogryz
Global Moderator
Hero Member
Posts: 2770
Re: ListBox out of bounds
«
Reply #4 on:
August 28, 2019, 04:42:14 am »
I think I know what's going on.
on you ListBox you've OnSelectionChanged event.
The event is NOT fired when you do ListBox.Items.Clear on Windows.
The event IS fired when you do the same on macOS.
It's likely you're trying to access an item by .ItemIndex. which is -1 at this point. And this is how you're getting the message.
upd:
please try trunk
«
Last Edit: August 28, 2019, 04:53:16 am by skalogryz
»
Logged
trev
Global Moderator
Hero Member
Posts: 2023
Former Delphi 1-7, 10.2 user
Re: ListBox out of bounds
«
Reply #5 on:
August 28, 2019, 08:18:10 am »
Yep r61775 fixes the Out of Bounds error :-)
Thanks Dmitry.
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