set the prev button in accordance to if it is possible to go back or not

4 files changed, 13 insertions, 6 deletions

diff --git a/dispatch.py b/dispatch.py
index 505c56a63..6499f0824 100644
--- a/dispatch.py
+++ b/dispatch.py
@@ -109,6 +109,16 @@ class Dispatcher:
 	self.dir = 1
 	self.moveStep()
 
+    def canGoBack(self):
+        # begin with the step before this one.  If all steps are skipped,
+        # we can not go backwards from this screen
+        i = self.step - 1
+        while i >= self.firstStep:
+            if not self.skipSteps.has_key(installSteps[i][0]):
+                return 1
+            i = i - 1
+        return 0
+
     def setStepList(self, *steps):
         # only remove non-permanently skipped steps from our skip list
         for step, state in self.skipSteps.items():
diff --git a/gui.py b/gui.py
index bcaac637a..ca943a865 100755
--- a/gui.py
+++ b/gui.py
@@ -503,7 +503,8 @@ class InstallControlWindow:
 	exec s
 
 	ics = InstallControlState (self)
-
+        ics.setPrevEnabled(self.dispatch.canGoBack())
+        
 	self.destroyCurrentWindow()
         self.currentWindow = newScreenClass(ics)
 
@@ -557,7 +558,6 @@ class InstallControlWindow:
  
         self.html.source (ics.getHTML(self.langSearchPath))
 
-
         if (ics.getGrabNext ()):
             nextButton.grab_focus ()
 
@@ -745,7 +745,7 @@ class InstallControlState:
         self.searchPath = [ "./", "/usr/share/anaconda/", "./" ]
         self.cw = cw
         self.prevEnabled = 1
-        self.nextEnabled = 0
+        self.nextEnabled = 1
 	self.nextButtonInfo = None
         self.helpButtonEnabled = TRUE
         self.title = _("Install Window")
diff --git a/iw/iw_gui.py b/iw/iw_gui.py
index e66bb3d3f..f63820cca 100644
--- a/iw/iw_gui.py
+++ b/iw/iw_gui.py
@@ -7,8 +7,6 @@ class InstallWindow:
 
     def __init__ (self,ics):
         self.ics = ics
-        ics.setNextEnabled (1)
-        ics.setPrevEnabled (1)
 
 	if self.htmlTag:
 	    ics.readHTML (self.htmlTag)
diff --git a/iw/language_gui.py b/iw/language_gui.py
index 8be5e1912..f0612976b 100644
--- a/iw/language_gui.py
+++ b/iw/language_gui.py
@@ -9,7 +9,6 @@ class LanguageWindow (InstallWindow):
 
     def __init__ (self, ics):
 	InstallWindow.__init__ (self, ics)
-        ics.setPrevEnabled(FALSE)
 
     def getNext (self):
 	self.instLang.setRuntimeLanguage(self.lang)