remember previously selected sections

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@4990 212acab6-be3b-0410-9dea-997c60f758d6

Examples/Memento.nsi

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+!include LogicLib.nsh
+!include Memento.nsh
+
+Name Memento
+OutFile Memento.exe
+
+XPStyle on
+
+ShowInstDetails show
+
+Page components
+Page instfiles
+
+# settings
+
+!define MEMENTO_REGISTRY_ROOT HKLM
+!define MEMENTO_REGISTRY_KEY "Software\NSIS\Memento Test"
+
+# restore
+
+Function .onInit
+
+  ${If} ${Cmd} `MessageBox MB_YESNO "Would you like to load an example state?" IDYES`
+    
+	DeleteRegKey  HKLM "Software\NSIS\Memento Test"
+
+	WriteRegStr   HKLM "Software\NSIS\Memento Test" MementoSectionUsed ""
+	WriteRegDWORD HKLM "Software\NSIS\Memento Test" MementoSection_sec_horse   1
+	WriteRegDWORD HKLM "Software\NSIS\Memento Test" MementoSection_sec_chicken 1
+	WriteRegDWORD HKLM "Software\NSIS\Memento Test" MementoSection_sec_donkey  0
+	WriteRegDWORD HKLM "Software\NSIS\Memento Test" MementoSection_sec_croc    0
+
+  ${EndIf}
+
+  ${MementoSectionRestore}
+
+FunctionEnd
+
+# sections
+
+${MementoSection} horse sec_horse
+${MementoSectionEnd}
+
+${MementoSection} donkey sec_donkey
+${MementoSectionEnd}
+
+${MementoSection} chicken sec_chicken
+${MementoSectionEnd}
+
+SectionGroup /e group
+
+  SectionGroup /e group
+
+    ${MementoSection} croc sec_croc
+    ${MementoSectionEnd}
+
+    ${MementoSection} cow sec_cow
+    ${MementoSectionEnd}
+
+  SectionGroupEnd
+
+SectionGroupEnd
+
+${MementoUnselectedSection} dinosaur sec_dinosaur
+${MementoSectionEnd}
+
+# done...
+
+${MementoSectionDone}
+
+# save
+
+Function .onInstSuccess
+
+  ${MementoSectionSave}
+
+FunctionEnd