nsDialogs - using ${NSD_CreateListBox}

johnbm
23rd August 2007 21:23 UTC

nsDialogs - using ${NSD_CreateListBox}
I'm interested in using a listbox in nsDialogs. It's unclear to me from the documentation I have seen though how one can populate the listbox and once this is done how one captures the selection made in the listbox.

If I use the code:

${NSD_CreateListBox} 100 40 20% 12u "sample entry"

it will create a blank listbox.

Would anyone be able to clarify this for me?

Thanks, John

kichik
24th August 2007 08:36 UTC

You can add items with LB_ADDSTRING.

${NSD_CreateListBox} 100 40 20% 12u ""
Pop $ListBox
SendMessage $ListBox ${LB_ADDSTRING} 0 "STR:Simple entry"
SendMessage $ListBox ${LB_ADDSTRING} 0 "STR:Another entry"
SendMessage $ListBox ${LB_ADDSTRING} 0 "STR:Blah"

jeffadams78
24th August 2007 16:51 UTC

How do you get the selection from the list box? And can you have a change function?

GetFunctionAddress $0 OnMyListBoxChange
nsDialogs::OnChange /NOUNLOAD $MY_LIST_BOX $0

Doesn't seem to work...

Afrow UK
24th August 2007 17:26 UTC

Look up MSDN for LB_ADDSTRING and you will see all the other list box messages available.

Stu

kichik
24th August 2007 17:33 UTC

Send LB_GETCURSEL to get the selected state of an item.

SendMessage $MY_LIST_BOX ${LB_GETCURSEL} 0 0 $0
# $0 will not be zero if the item is selected

List box notification is only sent when the LBS_NOTIFY style is used. I have added it to the next version of nsDialogs.nsh. For the current version, you can manually create the list box when the desired flags or add |${LBS_NOTIFY} to the definition of __NSD_ListBox_STYLE in nsDialogs.nsh.

jeffadams78
24th August 2007 18:39 UTC

LB_GETCURSEL returns the index or "LB_ERR" if no line is selected. Any idea what LB_ERR is? -1? You don't appear to have it defined in nsDialogs.nsh. The index is supposedly 0-based, so 0 is valid (first line).

kichik
24th August 2007 18:47 UTC

It's -1.

jeffadams78
24th August 2007 18:48 UTC

You beat me to the post ;). LB_ERR = -1... because that's what I get back every time I send the LB_GETCURSEL message. Any idea why that would be?------

Nevermind, it was a bug in my code, I get the correct value from the message I wasn't copying it into the right variable.

Manually creating the list box with LBS_NOTIFY worked great though as far as getting OnChange notifications.

Thanks!

jeffadams78
24th August 2007 19:08 UTC

Any reason why LB_GETTEXT wouldn't work? I'm trying to get the text that the user selected, and I think this should work:

SendMessage $MY_LIST_BOX ${LB_GETCURSEL} 0 0 $0
${IF} $0 >= 0
IntOp $1 $0 + 0;
SendMessage $MY_LIST_BOX ${LB_GETTEXT} $1 $0 $2
MessageBox MB_OK '0: $0, 1: $1, 2: $2'
${ENDIF}

I always get back: $0 is the correct index (from the first SendMessage, the second one fails and doesn't write to it), $1 is the same (since I copied $0 into it), and $2 is LB_ERR, which according to the MSDN means that I passed an invalid index... but it is valid.

kichik
24th August 2007 19:10 UTC

Yes, you need System::Call for that. SendMessage alone can't handle strings returning from the message.

System::Call user32::SendMessage(i$MY_LIST_BOX,i${LB_GETTEXT},i$INDEX,t.$0)

jeffadams78
24th August 2007 19:21 UTC

Hmm, that still didn't work. I've actually changed my mind and decided that the index is fine for my purposes, but thanks for your help.

johnbm
24th August 2007 20:22 UTC

kichik thanks for your help, that worked well and it's pointed me in the right direction on a number of things. I'm now trying to create a combobox with a dropdown style.

${NSD_CreateComboBox} 200 20 20% 59u ""
Pop $ComboBox
SendMessage $ComboBox ${CB_ADDSTRING} 0 "STR:First Entry"
SendMessage $ComboBox ${CB_ADDSTRING} 0 "STR:Second Entry"
SendMessage $ComboBox ${CB_ADDSTRING} 0 "STR:Third Entry"

I know that I need to use CBS_DROPDOWN to set the style and I expect that I add this as an extra parameter to

${NSD_CreateComboBox} 200 20 20% 59u ""

but I'm not sure of the syntax.

I believe one may also be able to do this by using CreateWindow. Does anyone know how this is done?

klopfdreh
13th February 2008 10:10 UTC

Hello,

I saw that thread about ListBox and I tried it by myself, but this codesnippet below doesn't work for me:

${NSD_CreateListBox} 0 60 100% 100% ""

>Pop $ListBox

SendMessage $ListBox${LB_ADDSTRING} 0 "HELLOOO"

I defined a Var ListBox and the Compiler compiled it without any errors. :weird:

Thanks so far!

kichik
13th February 2008 10:14 UTC

Use "STR:HELLOOO" instead of just "HELLOOO".

klopfdreh
13th February 2008 10:20 UTC

Thanks kichik - thats right!

And how can I clear the list?

Edit: Saw it in some CPP Code


SendMessage $ListBox ${LB_RESETCONTENT} 0 0 

>

Thanks a lot!

P.S.:

May you are able to help me with DialogsEx? I have another post here with a problem which hasn't been solved yet:

Topic:
Custom Page with FileSelect-Button

URL:
http://forums.winamp.com/showthread....hreadid=286733

Ivan Andreevich
16th December 2008 19:23 UTC

Ah, this was something I was looking for.

I am using an nsDialogs DropList, so my code is slightly different. Here it is for reference. It's combo box commands.

Clear droplist:
SendMessage $DropList ${CB_RESETCONTENT} 0 0

Add entry ($1) to droplist:
SendMessage $DropList ${CB_ADDSTRING} 0 "STR:$1"

Select entry ($1) in the droplist:
SendMessage $DropList ${CB_SELECTSTRING} 0 "STR:$1"

Ivan