Angus Leeming
25th June 2005 11:23 UTC

Callback functions to individual widgets?
I have a custom page that looks like:

--------------------------------------------------------
Software Audit

[x] Python C:\Python24\Python.exe
[ ] Perl C:\PROGRA~1\Perl\bin\perl.exe
[ ] LaTeX
... Several more components

Select an item for more details or to download a missing package.
--------------------------------------------------------

I've been asked to try to simplify things by showing the paths to the .exe files only if the user asks for them. I imagine adding a checkbox: [ ] Show location
so that the view changes on the fly to

--------------------------------------------------------
Software Audit
[ ] Show location
[x] Python Installed already
[ ] Perl Installed already
[ ] LaTeX
...
--------------------------------------------------------

Is such a thing possible? I guess I mean, "Can I connect a callback function to a checkbox?"

Also, are there any docs for the syntax of a .ini file? I can't find them in the NSIS help pages.

Regards,
Angus

Afrow UK
25th June 2005 11:28 UTC

Yes it should be possible, if you use the Flag=NOTIFY attribute. Then on the Page Leave function, you need to read from [Settings]=>State (which will be the field number) then call Abort when you're done with validation.

If that doesn't work, then just do all validation when user clicks Next button, then go back to page if things aren't right (perhaps with MessageBox).

-Stu

Angus Leeming
25th June 2005 11:42 UTC

Perfect!
Angus

Angus Leeming
25th June 2005 12:27 UTC

Hmmmmmmmm. Not quite perfect. I can call the function where I specify the labels:

StrCpy $0 "..."
!insertmacro MUI_INSTALLOPTIONS_WRITE "software_audit.ini" "Field 3" "Text" $0

But the view of this label isn't being updated. Is there a MUI_INSTALLOPTIONS_FLUSH or such like?

Angus

Afrow UK
25th June 2005 12:50 UTC

You need to manipulate the dialog with SendMessage instead (as the dialog at that time is in memory, no longer in INI file).

Example:

!include WinMessages.nsh

Var HWND

Function show
 !insertmacro MUI_INSTALLOPTIONS_INITDIALOG "io_file.ini"
  Pop $HWND ;HWND of dialog
 !insertmacro MUI_INSTALLOPTIONS_SHOW
FunctionEnd

Function leave
 GetDlgItem $R0 $HWND 1200 ;1200 + Field number - 1
 CreateFont $R1 "Tahoma" 10 700 
 SendMessage $R0 ${WM_SETFONT} $R0 0
FunctionEnd

Angus Leeming
25th June 2005 16:49 UTC

Thanks, Stu. I've almost got it working, but the code below ends up clearing the text, not showing the new stuff. That's despite the fact that the MessageBox does show the right stuff:

${if} $SAVisible == "1"
GetDlgItem $2 $DialogHandle 1207
MessageBox MB_OK "Item: $2$\r$\nText: $0"
SendMessage $2 ${WM_SETTEXT} "$0" 0
${else}
!insertmacro MUI_INSTALLOPTIONS_WRITE "software_audit.ini" "Field 8" "Text" $0
${endif}

The code looks reasonable to me, so I'm a little stumped...
Angus

kichik
25th June 2005 16:54 UTC

Use:

 SendMessage $2 ${WM_SETTEXT} 0 "STR:$0" 

Angus Leeming
25th June 2005 17:13 UTC

Woooooo! It works! Many thanks to you both.
Angus