From 26526207cf40a67b8685ab600407a2bf081e397b Mon Sep 17 00:00:00 2001
From: "pierre%netscape.com" <pierre%netscape.com>
Date: Fri, 16 Oct 1998 09:18:03 +0000
Subject: [PATCH] added Previous() and ResetToLast() to the Enumerator

---
 widget/src/xpwidgets/nsBaseWidget.cpp | 29 +++++++++++++++++++++++++++
 widget/src/xpwidgets/nsBaseWidget.h   |  2 ++
 2 files changed, 31 insertions(+)

diff --git a/widget/src/xpwidgets/nsBaseWidget.cpp b/widget/src/xpwidgets/nsBaseWidget.cpp
index 0dcbc1fe3da7..a2856e53cf79 100644
--- a/widget/src/xpwidgets/nsBaseWidget.cpp
+++ b/widget/src/xpwidgets/nsBaseWidget.cpp
@@ -452,6 +452,24 @@ nsISupports* nsBaseWidget::Enumerator::Next()
   return NULL;
 }
 
+//-------------------------------------------------------------------------
+//
+// Get enumeration previous element. Return null at the end
+//
+//-------------------------------------------------------------------------
+nsISupports* nsBaseWidget::Enumerator::Previous()
+{
+  if (mCurrentPosition > 0) {
+    mCurrentPosition--;
+    nsIWidget*  widget = (nsIWidget*)mChildren.ElementAt(mCurrentPosition);
+
+    NS_IF_ADDREF(widget);
+    return widget;
+  }
+
+  return NULL;
+}
+
 
 //-------------------------------------------------------------------------
 //
@@ -464,6 +482,17 @@ void nsBaseWidget::Enumerator::Reset()
 }
 
 
+//-------------------------------------------------------------------------
+//
+// Reset enumerator internal pointer to the end
+//
+//-------------------------------------------------------------------------
+void nsBaseWidget::Enumerator::ResetToLast()
+{
+  mCurrentPosition = mChildren.Count();
+}
+
+
 //-------------------------------------------------------------------------
 //
 // Append an element 
diff --git a/widget/src/xpwidgets/nsBaseWidget.h b/widget/src/xpwidgets/nsBaseWidget.h
index 683cb68ca369..2422a7b27709 100644
--- a/widget/src/xpwidgets/nsBaseWidget.h
+++ b/widget/src/xpwidgets/nsBaseWidget.h
@@ -118,7 +118,9 @@ protected:
       ~Enumerator();
 
       NS_IMETHOD_(nsISupports*) Next();
+      NS_IMETHOD_(nsISupports*) Previous();
       NS_IMETHOD_(void) Reset();
+      NS_IMETHOD_(void) ResetToLast();
 
       void Append(nsIWidget* aWidget);
       void Remove(nsIWidget* aWidget);