Insert Custom Page between 2 sections in NSIS - nsis

Question

(I am sorry I couldn't come up with a better title)
I have the following partial-code:
!insertmacro MUI_PAGE_COMPONENTS
!insertmacro MUI_PAGE_INSTFILES
Page Custom nsDialogsPage nsDialogsPageLeave
section Section1
#do something
sectionEnd
section Section2
#do something else
sectionEnd
Function nsDialogsPage
#do something
FunctionEnd
Function nsDialogsPageLeave
#do something else
FunctionEnd
But, now I want the Custom Page to show up after Section1 and before Section2 (I Enter some info in the custom page which is used in Section2). How should I go about this ? (I can always put the Custom Page before MUI_PAGE_INSTFILES, but that looks rather odd for the user.)

Answer 1

All sections are executed on the instfiles page, it is however possible to have multiple instfiles pages. To prevent all sections from executing twice you need to turn the correct sections on/off with the helper macros in sections.nsh or store some state in a global variable and put all the sections code inside a if block, ex:${If} $installstep = 0. You might also need to use SetAutoClose...

Answer 2

I used a PRE Function to select/unselect sections:
!insertmacro MUI_PAGE_COMPONENTS
!define MUI_PAGE_CUSTOMFUNCTION_PRE checkSkipSection
!insertmacro MUI_PAGE_INSTFILES
Page Custom nsDialogsPage nsDialogsPageLeave
!define MUI_PAGE_CUSTOMFUNCTION_PRE checkSkipSection
!insertmacro MUI_PAGE_INSTFILES
Var SkipSection
section Section1
#do something
StrCpy $SkipSection 1
sectionEnd
section Section2
#do something else
sectionEnd
Function nsDialogsPage
#do something
FunctionEnd
Function nsDialogsPageLeave
#do something else
FunctionEnd
Function checkSkipSection
${If} $SkipSection = ""
SectionSetFlags ${Section1} ${SF_SELECTED}
SectionSetFlags ${Section2} 0
${ElseIf} $SkipSection = 1
SectionSetFlags ${Section2} ${SF_SELECTED}
SectionSetFlags ${Section1} 0
${EndIf}
FunctionEnd
So in the 1st MUI_PAGE_INSTFILES, only Section1 is run, while Section2 is run in the 2nd MUI_PAGE_INSTFILES page.