deepThink
5th August 2003 19:36 UTC

Keeping Window Contents Visible
I understand to validate a custom page, I am to retrieve the value of success, back, cancel, error, etc. I have the code working properly as follows:

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

exitVideoInstall:

push $5
!insertmacro MUI_INSTALLOPTIONS_DISPLAY_RETURN "ioB.ini"
Pop $5


!insertmacro MUI_INSTALLOPTIONS_READ $R2 "ioB.ini" "Field 3" "State"
!insertmacro MUI_INSTALLOPTIONS_READ $R5 "ioB.ini" "Field 6" "State"
!insertmacro MUI_INSTALLOPTIONS_READ $R3 "ioB.ini" "Field 9" "State"

;;Check for proper directory names. If a directory has a "\" at the end of it, remove the "\"

strcpy $6 $R2 1 -1
strcmp $6 "\" "" +2
strcpy $R2 $R2 -1 ;Remove "\"
strcpy $6 $R5 1 -1
strcmp $6 "\" "" +2
strcpy $R5 $R5 -1 ;Remove "\"
strcpy $6 $R3 1 -1
strcmp $6 "\" "" +2
strcpy $R3 $R3 -1 ;Remove "\"

;Check to make sure each directory has a ":" as the second character

strcpy $6 $R2 1 1
strcmp $6 ":" "" abortMyPage
strcpy $6 $R5 1 1
strcmp $6 ":" "" abortMyPage
strcpy $6 $R3 1 1
strcmp $6 ":" exitPage abortMyPage

abortMyPage:
;Do pop up window if next button is pushed
strcmp $5 "success" "" exitPage
MessageBox MB_ICONEXCLAMATION|MB_OK 'Your directories must exist on local drives or your \
network drives must be mapped to a drive letter. All \
drives must begin "Z:\" where Z is an appropriate drive \
letter.'
goto exitVideoInstall

exitPage:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

My problem is that when the MessageBox appears, the contents on the screen behind the MessageBox disappear. Is there a way to keep the contents in the custom page appearing behind the MessageBox window; similar to what happens when the Cancel button is pushed?

pengyou
5th August 2003 19:54 UTC

If you use a "leave" function for your custom page and do the validation in the "leave" function then the message box generated by the "leave" function will appear on top of the custom page (so you can still see the custom page contents).

You need to be using NSIS 2.0b4 in order to be able to use a custom page "leave" function.

deepThink
5th August 2003 20:28 UTC

How to set up?
How would I set up the code for that? Is it similar to the standard LEAVE, SHOW, and PRE set up?

Once set up, how do I return to the page if validation fails or continue if validation is successful?

Also, where would I get the latest version NSIS 2.0b4?

pengyou
5th August 2003 21:04 UTC

Hopefully these simple code fragments will give you some hints about how to use a leave function with a custom page.

When listing the pages for your installer, specify a "leave" function for the custom page:

!insertmacro MUI_PAGE_DIRECTORY
Page custom MyCustomPage "MyLeaveFunction"

Function MyCustomPage

  ; Display the custom page
  !insertmacro MUI_INSTALLOPTIONS_DISPLAY "demo.ini"

FunctionEnd

Function MyLeaveFunction
  Push $R9
  Push $R8

  !insertmacro MUI_INSTALLOPTIONS_READ $R9 "demo.ini" "Field 2" "State"
  !insertmacro MUI_INSTALLOPTIONS_READ $R8 "demo.ini" "Field 4" "State"

  StrCmp $R9 $R8 bad_data good_data

bad_data:
  MessageBox MB_OK|MB_ICONEXCLAMATION "Input values cannot be the same"
  ; Stay with the custom page created by "MyCustomPage"
  Pop $R8
  Pop $R9
  Abort

good_exit:
  ; Allow next page in the installation sequence to be shown
  Pop $R8
  Pop $R9
FunctionEnd

deepThink
5th August 2003 22:37 UTC

Leave seems to be PRE
When I put a MessageBox (just for checking purposes) in my validating function that is supposed to trigger when the user leaves the custom page, the MessageBox pops up upon coming into the page, not upon leaving it. It appears to be a PRE trigger and not a LEAVE trigger. Is this an error?

deepThink
5th August 2003 22:43 UTC

Leave seems to be PRE
When I put a MessageBox (just for checking purposes) in my validating function that is supposed to trigger when the user leaves the custom page, the MessageBox pops up upon coming into the page, not upon leaving it. It appears to be a PRE trigger and not a LEAVE trigger. Is this an error?

pengyou
6th August 2003 00:25 UTC

If you want to display a message box when you leave the custom page, you can put it in the custom page function, after the MUI_INSTALLOPTIONS_DISPLAY (or MUI_INSTALLOPTIONS_DISPLAY_RETURN if that is what you are using).

Function MyCustomPage

  ; Display the custom page
  !insertmacro MUI_INSTALLOPTIONS_DISPLAY "demo.ini"

  MessageBox MB_OK "Good-bye"

FunctionEnd

deepThink
6th August 2003 11:15 UTC

Thanks
What happened was I put the leave callback function on the custom page right before the custom page that I wanted to insert it onto, thus, making it appear as though the function was being called as a pre callback.

It works fine now. Thanks much for your input.

pengyou
6th August 2003 12:30 UTC

Glad I was able to help.