Add new scroll method to allow scrolling to top or bottom of doc.

view/public/nsIScrollableView.h

@@ -204,6 +204,14 @@ public:
    */
   NS_IMETHOD ScrollByPages(PRInt32 aNumPages) = 0;
 
+  /**
+   * Scroll the view to the top or bottom of the document depending
+   * on the value of aTop.
+   * @param aForward indicates whether to scroll to top or bottom
+   * @return error status
+   */
+  NS_IMETHOD ScrollByWhole(PRBool aTop) = 0;
+
   /**
    * Returns the clip view
    */

view/src/nsScrollingView.cpp

@@ -1578,6 +1578,24 @@ NS_IMETHODIMP nsScrollingView::ScrollByPages(PRInt32 aNumPages)
 	return NS_OK;
 }
 
+NS_IMETHODIMP nsScrollingView::ScrollByWhole(PRBool aTop)
+{
+	nscoord   newPos = 0;
+
+  if (aTop) {
+		newPos = 0;
+  }
+  else {
+  	nsSize    clipSize;
+	  mClipView->GetDimensions(&clipSize.width, &clipSize.height);
+		newPos = mSizeY - clipSize.height;
+  }
+
+	ScrollTo(0, newPos, 0);
+
+	return NS_OK;
+}
+
 PRBool nsScrollingView::CannotBitBlt(nsIView* aScrolledView)
 {
   PRBool    trans;

view/src/nsScrollingView.h

@@ -75,6 +75,7 @@ public:
   NS_IMETHOD  GetLineHeight(nscoord *aHeight);
   NS_IMETHOD  ScrollByLines(PRInt32 aNumLines);
   NS_IMETHOD  ScrollByPages(PRInt32 aNumPages);
+  NS_IMETHOD  ScrollByWhole(PRBool aTop);
   
   NS_IMETHOD  GetClipView(const nsIView** aClipView) const;