Programmatically return back to the previuos page

chocho_rock · 22nd January 2003, 16:34

Hi everybody.
I'd like to obtain the following behaviour with NSIS 2.0 beta 0:
When the user clicks "Next" on the directory choosing page, the path is verified (maybe in the next page creation function)
and if it is not valid, a warning is displayed and the directory choosing page is displayed again.
I'm not able to obtain it because in the creation callback function of a custom page it is not possible to return back to the previous page, but only to skip the current one with Abort.

I can not user .onVerifyInstDir because it's called while the user is typing, and I don't like this behaviour.. as I said I'd like to check the path when the "next" button is pressed.

Anyone can help please?

Thanks
Chocho

virtlink · 22nd January 2003, 17:08

Look here and use the post_function to check wether the path is valid. If not, use 'abort'.

kichik · 22nd January 2003, 17:09

Post function is called just before the page is shown, not after. I am working right now on a function that will do that because a lot of people requested it and because it will solve the radio buttons/checkbox on the license page problem.

virtlink · 22nd January 2003, 17:12

Gosh, never used it, so...

Then it will propably become:

Page license|directory|etc... [preshow_function] [postshow_function] [onleave_function]

(chocho_rock, before copying my line here, this won't work yet!)

kichik · 22nd January 2003, 17:14

Precreate, preshow, and preleave.

kichik · 22nd January 2003, 19:06

OK, I have finished this, but I want to test it a bit so I will release it only tomorrow.

danno6000 · 31st January 2003, 20:23

Is the preleave funtionality going to be implemented for a custom page?

kichik · 1st February 2003, 10:32

I am sorry, I forgot to let you know. It's already available in the latest CVS version.

danno6000 · 3rd February 2003, 11:52

After looking at the latest code, I don't see how to implement the 'preleave' function for a custom page. It only seems to be dealt with for the non-custom pages.

I don't know if it's a typo or not, but lines 785-788 in script.cpp look like they may not do what was inteded. Both of these 'if' statements set p.showfunc. Should the second one set p.leavefunc?

kichik · 3rd February 2003, 12:53

Pre-leave function was not designed to work with custom pages, but now that I look at it again, it should. I'll add this in a couple of days.

Those lines indeed contain a typo. Thanks.

treaz · 7th March 2003, 21:05

Hi,

I was just wondering if the Pre-leave function is now available for custom pages?

Thanks.

kichik · 7th March 2003, 21:06

Oops... Thanks for reminding me. It's now in the todo list where I won't miss it

Joel · 7th March 2003, 21:31

This means, now the installer can return to a previuos page automatically?
How? someone have a script example?

Sunjammer · 8th March 2003, 08:54

No it's *not* available yet. KiCHiK added it to the CVS file TODO.txt so that he knows it needs to be done and won't be forgotten.

kichik · 8th March 2003, 10:09

Well, actually it's only not available for custom pages. For normal pages just use the leave callback function. If you call Abort from that function it won't leave the page.

kichik · 18th March 2003, 14:51

Ready and waiting in CVS. Use NSIS Update to get it.

mlm · 22nd April 2003, 05:53

Is there any example code for the leave function in a custom page?

Afrow UK · 22nd April 2003, 10:34

This will work.
Use like so...

Page Custom CustomPage

code:


Function CustomPage

top:

	InstallOptions::dialog "$PLUGINSDIR\IO1.ini"



ReadINIStr $R0 "$PLUGINSDIR\IO1.ini" "Field 2" "State"



IfFileExists $R0\*.* done

MessageBox MB_OK|MB_ICONEXCLAMATION "The entered installtion path is invalid."

Goto top



done:

FunctionEnd

-Stu

kichik · 22nd April 2003, 11:39

Your example doens't use the new leave callback function. Contrib\InstallOptions\test.nsi contains such an example.

mlm · 23rd April 2003, 03:07

I think I'm confused. What exactly is the leave callback function. Can you use it in a .nsi script? Or do you have to edit the C code?

Afrow UK, I was able to use the code you posted. It does exactly what I want, but I would still like to know what the leave callback is.

thanks for all the help!
mlm (aka, digitalda)

mlm · 23rd April 2003, 05:42

I'm having some problems. I tried to implement the above suggestion and I thought it was working, but now when I try to cancel before making a selection it forces me to make a selection before canceling.

PHP Code:


			
Function SetIDE

  MakeSelection:

    !insertmacro MUI_HEADER_TEXT "Choose your IDE" ""

    !insertmacro MUI_INSTALLOPTIONS_DISPLAY "SetIDE.ini"

      !insertmacro MUI_INSTALLOPTIONS_READ $R1 "SetIDE.ini" "Field 2" "State"

      !insertmacro MUI_INSTALLOPTIONS_READ $R2 "SetIDE.ini" "Field 3" "State"

      !insertmacro MUI_INSTALLOPTIONS_READ $R3 "SetIDE.ini" "Field 4" "State"

      

    StrCmp $R1 "1" "Done" ""

    StrCmp $R2 "1" "Done" ""

    StrCmp $R3 "1" "Done" ""



    MessageBox MB_OK|MB_iconexclamation "Please select your IDE."

     Goto MakeSelection

  Done:

FunctionEnd

any suggestions?

virtlink · 23rd April 2003, 08:39

A callback function is a function that is called when a particular event occures. The normal Page-instruction syntax is this:

PHP Code:


			
Page (license|components|directory|instfiles) ***91;pre_function***93; ***91;show_function***93; ***91;leave_function***93;

[pre_function] is replaced by the name of the function that is called before showing the page.
[show_function] is replaced by the name of the function that should be called after creating the page's components, but before showing it (allows some UI tweaking).
[leave_function] is replaced by the name of the function that is called just before the page is made invisible, but after the 'Next' button is clicked.

Something similar now exists for Custom pages:

PHP Code:


			
Page custom ***91;creator_function***93; ***91;leave_function***93; ***91;caption***93;

[creator_function] is replaced by the name of the function which contains the custom page creating script (InstallOptions::dialog "$PLUGINSDIR\IO.ini").
[leave_function] is replaced by the name of the function that is called just before the page is made invisible, but after the 'Next' button of the custom page is clicked.

This allows something like this (not tested):

PHP Code:


			
Page custom CustomPageCreate CustomPageLeave



Function CustomPageCreate

  GetTempFileName $R0

  File /oname=$R0 customPage.ini

  InstallOptions::dialog $R0

FunctionEnd



Function CustomPageLeave

  MessageBox MB_YES "Do you want to leave the custom page?" IDYES yes

    Abort

  yes:

FunctionEnd

22nd January 2003, 16:34	#1
chocho_rock Junior Member Join Date: Jan 2003 Posts: 1	Programmatically return back to the previuos page Hi everybody. I'd like to obtain the following behaviour with NSIS 2.0 beta 0: When the user clicks "Next" on the directory choosing page, the path is verified (maybe in the next page creation function) and if it is not valid, a warning is displayed and the directory choosing page is displayed again. I'm not able to obtain it because in the creation callback function of a custom page it is not possible to return back to the previous page, but only to skip the current one with Abort. I can not user .onVerifyInstDir because it's called while the user is typing, and I don't like this behaviour.. as I said I'd like to check the path when the "next" button is pressed. Anyone can help please? Thanks Chocho

22nd January 2003, 17:08	#2
virtlink Major Dude Join Date: Sep 2002 Location: At [4C69:6E6B] Posts: 561	Look here and use the post_function to check wether the path is valid. If not, use 'abort'. "I'll quote you when you say something memorable." - Claudia Pelsmaeker

22nd January 2003, 17:09	#3
kichik M.I.A. [NSIS Dev, Mod] Join Date: Oct 2001 Location: Israel Posts: 11,337	Post function is called just before the page is shown, not after. I am working right now on a function that will do that because a lot of people requested it and because it will solve the radio buttons/checkbox on the license page problem. NSIS FAQ \| NSIS Home Page \| Donate $ "I hear and I forget. I see and I remember. I do and I understand." -- Confucius

22nd January 2003, 17:12	#4
virtlink Major Dude Join Date: Sep 2002 Location: At [4C69:6E6B] Posts: 561	Gosh, never used it, so... Then it will propably become: Page license\|directory\|etc... [preshow_function] [postshow_function] [onleave_function] (chocho_rock, before copying my line here, this won't work yet!) "I'll quote you when you say something memorable." - Claudia Pelsmaeker

22nd January 2003, 17:14	#5
kichik M.I.A. [NSIS Dev, Mod] Join Date: Oct 2001 Location: Israel Posts: 11,337	Precreate, preshow, and preleave. NSIS FAQ \| NSIS Home Page \| Donate $ "I hear and I forget. I see and I remember. I do and I understand." -- Confucius

22nd January 2003, 19:06	#6
kichik M.I.A. [NSIS Dev, Mod] Join Date: Oct 2001 Location: Israel Posts: 11,337	OK, I have finished this, but I want to test it a bit so I will release it only tomorrow. NSIS FAQ \| NSIS Home Page \| Donate $ "I hear and I forget. I see and I remember. I do and I understand." -- Confucius

31st January 2003, 20:23	#7
danno6000 Junior Member Join Date: Jan 2003 Posts: 2	PreLeave funtionality on a custom page Is the preleave funtionality going to be implemented for a custom page?

1st February 2003, 10:32	#8
kichik M.I.A. [NSIS Dev, Mod] Join Date: Oct 2001 Location: Israel Posts: 11,337	I am sorry, I forgot to let you know. It's already available in the latest CVS version. NSIS FAQ \| NSIS Home Page \| Donate $ "I hear and I forget. I see and I remember. I do and I understand." -- Confucius

3rd February 2003, 11:52	#9
danno6000 Junior Member Join Date: Jan 2003 Posts: 2	Looking at code After looking at the latest code, I don't see how to implement the 'preleave' function for a custom page. It only seems to be dealt with for the non-custom pages. I don't know if it's a typo or not, but lines 785-788 in script.cpp look like they may not do what was inteded. Both of these 'if' statements set p.showfunc. Should the second one set p.leavefunc?

3rd February 2003, 12:53	#10
kichik M.I.A. [NSIS Dev, Mod] Join Date: Oct 2001 Location: Israel Posts: 11,337	Pre-leave function was not designed to work with custom pages, but now that I look at it again, it should. I'll add this in a couple of days. Those lines indeed contain a typo. Thanks. NSIS FAQ \| NSIS Home Page \| Donate $ "I hear and I forget. I see and I remember. I do and I understand." -- Confucius

7th March 2003, 21:05	#11
treaz Member Join Date: Jan 2003 Posts: 78	Hi, I was just wondering if the Pre-leave function is now available for custom pages? Thanks.

7th March 2003, 21:06	#12
kichik M.I.A. [NSIS Dev, Mod] Join Date: Oct 2001 Location: Israel Posts: 11,337	Oops... Thanks for reminding me. It's now in the todo list where I won't miss it NSIS FAQ \| NSIS Home Page \| Donate $ "I hear and I forget. I see and I remember. I do and I understand." -- Confucius

7th March 2003, 21:31	#13
Joel Debian user (Forum King) Join Date: Jan 2003 Location: Arch land Posts: 4,896	This means, now the installer can return to a previuos page automatically? How? someone have a script example? * PC: Intel Core 2 DUO E6550 @ 2.33 GHz with 2 GB RAM: Archlinux w/ xfce4. * Laptop: Intel Core 2 DUO T6600 @ 2.20 GHz with 4 GB RAM: Debian unstable w/ xfce4.

8th March 2003, 08:54	#14
Sunjammer Major Dude Join Date: Jun 2002 Location: Swindon, UK Posts: 559	No it's not available yet. KiCHiK added it to the CVS file TODO.txt so that he knows it needs to be done and won't be forgotten.

8th March 2003, 10:09	#15
kichik M.I.A. [NSIS Dev, Mod] Join Date: Oct 2001 Location: Israel Posts: 11,337	Well, actually it's only not available for custom pages. For normal pages just use the leave callback function. If you call Abort from that function it won't leave the page. NSIS FAQ \| NSIS Home Page \| Donate $ "I hear and I forget. I see and I remember. I do and I understand." -- Confucius

18th March 2003, 14:51	#16
kichik M.I.A. [NSIS Dev, Mod] Join Date: Oct 2001 Location: Israel Posts: 11,337	Ready and waiting in CVS. Use NSIS Update to get it. NSIS FAQ \| NSIS Home Page \| Donate $ "I hear and I forget. I see and I remember. I do and I understand." -- Confucius

22nd April 2003, 05:53	#17
mlm Junior Member Join Date: Apr 2003 Posts: 8	Is there any example code for the leave function in a custom page?

22nd April 2003, 11:39	#19
kichik M.I.A. [NSIS Dev, Mod] Join Date: Oct 2001 Location: Israel Posts: 11,337	Your example doens't use the new leave callback function. Contrib\InstallOptions\test.nsi contains such an example. NSIS FAQ \| NSIS Home Page \| Donate $ "I hear and I forget. I see and I remember. I do and I understand." -- Confucius

23rd April 2003, 03:07	#20
mlm Junior Member Join Date: Apr 2003 Posts: 8	I think I'm confused. What exactly is the leave callback function. Can you use it in a .nsi script? Or do you have to edit the C code? Afrow UK, I was able to use the code you posted. It does exactly what I want, but I would still like to know what the leave callback is. thanks for all the help! mlm (aka, digitalda)

23rd April 2003, 05:42	#21
mlm Junior Member Join Date: Apr 2003 Posts: 8	I'm having some problems. I tried to implement the above suggestion and I thought it was working, but now when I try to cancel before making a selection it forces me to make a selection before canceling. PHP Code: Function SetIDE MakeSelection: !insertmacro MUI_HEADER_TEXT "Choose your IDE" "" !insertmacro MUI_INSTALLOPTIONS_DISPLAY "SetIDE.ini" !insertmacro MUI_INSTALLOPTIONS_READ $R1 "SetIDE.ini" "Field 2" "State" !insertmacro MUI_INSTALLOPTIONS_READ $R2 "SetIDE.ini" "Field 3" "State" !insertmacro MUI_INSTALLOPTIONS_READ $R3 "SetIDE.ini" "Field 4" "State" StrCmp $R1 "1" "Done" "" StrCmp $R2 "1" "Done" "" StrCmp $R3 "1" "Done" "" MessageBox MB_OK\|MB_iconexclamation "Please select your IDE." Goto MakeSelection Done: FunctionEnd any suggestions?

23rd April 2003, 08:39	#22
virtlink Major Dude Join Date: Sep 2002 Location: At [4C69:6E6B] Posts: 561	A callback function is a function that is called when a particular event occures. The normal Page-instruction syntax is this: PHP Code: `Page (license\|components\|directory\|instfiles) *91;pre_function93; 91;show_function93; 91;leave_function93;` [pre_function] is replaced by the name of the function that is called before showing the page. [show_function] is replaced by the name of the function that should be called after creating the page's components, but before showing it (allows some UI tweaking). [leave_function] is replaced by the name of the function that is called just before the page is made invisible, but after the 'Next' button is clicked. Something similar now exists for Custom pages: PHP Code: `Page custom 91;creator_function93; 91;leave_function93; 91;caption93;` [creator_function] is replaced by the name of the function which contains the custom page creating script (InstallOptions::dialog "$PLUGINSDIR\IO.ini"). [leave_function] is replaced by the name of the function that is called just before the page is made invisible, but after the 'Next' button of the custom page is clicked. This allows something like this (not tested): PHP Code: `Page custom CustomPageCreate CustomPageLeave Function CustomPageCreate GetTempFileName $R0 File /oname=$R0 customPage.ini InstallOptions::dialog $R0 FunctionEnd Function CustomPageLeave MessageBox MB_YES "Do you want to leave the custom page?" IDYES yes Abort yes: FunctionEnd` "I'll quote you when you say something memorable."* - Claudia Pelsmaeker

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode