Adding cursor support for column resizing.

git-svn-id: svn://10.0.0.236/trunk@44632 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/layout/xul/base/src/nsTreeCellFrame.cpp

@@ -190,8 +190,7 @@ nsTreeCellFrame::HandleEvent(nsIPresContext& aPresContext,
     HandleMouseExitEvent(aPresContext, aEvent, aEventStatus);
   else if (aEvent->message == NS_MOUSE_LEFT_DOUBLECLICK)
 		HandleDoubleClickEvent(aPresContext, aEvent, aEventStatus);
-
-
+ 
   return NS_OK;
 }
 
@@ -245,7 +244,6 @@ nsTreeCellFrame::HandleMouseExitEvent(nsIPresContext& aPresContext,
 {
   if (mIsHeader)
   {
-	  // Nothing to do?
   }
   else
   {
@@ -255,6 +253,49 @@ nsTreeCellFrame::HandleMouseExitEvent(nsIPresContext& aPresContext,
   return NS_OK;
 }
 
+PRBool
+nsTreeCellFrame::CanResize(nsPoint& aPoint) {
+  nsRect rect;
+  GetRect(rect);
+  PRInt32 diff = (rect.x + rect.width) - aPoint.x;
+
+  nsCOMPtr<nsIContent> parent;
+  mContent->GetParent(*getter_AddRefs(parent));
+  PRInt32 index;
+  parent->IndexOf(mContent, index);
+  PRInt32 count;
+  parent->ChildCount(count);
+  count--;
+
+  if ((index > 0 && diff <= 60) || ((rect.width - diff) <= 60 && index < count)) {
+    return PR_TRUE;
+  }
+  
+  return PR_FALSE;
+}
+
+NS_IMETHODIMP
+nsTreeCellFrame::GetCursor(nsIPresContext& aPresContext,
+                                     nsPoint&        aPoint,
+                                     PRInt32&        aCursor)
+{
+  if (mIsHeader) {
+    // Figure out if the point is over the resize stuff.
+    nsRect rect;
+    GetRect(rect);
+    PRInt32 diff = (rect.x + rect.width) - aPoint.x;
+
+    if (CanResize(aPoint)) {
+      aCursor = NS_STYLE_CURSOR_W_RESIZE;
+    }
+    else {
+      aCursor = NS_STYLE_CURSOR_DEFAULT;
+    }
+  }
+  else aCursor = NS_STYLE_CURSOR_DEFAULT;
+  return NS_OK;
+}
+
 void
 nsTreeCellFrame::ToggleOpenClose()
 {

mozilla/layout/xul/base/src/nsTreeCellFrame.h

@@ -46,6 +46,10 @@ public:
 
   NS_IMETHOD Destroy(nsIPresContext& aPresContext);
 
+  NS_IMETHOD GetCursor(nsIPresContext& aPresContext,
+                                     nsPoint&        aPoint,
+                                     PRInt32&        aCursor);
+
   void Hover(nsIPresContext& presContext, PRBool isHover, PRBool notifyForReflow = PR_TRUE);
 
   nsTableFrame* GetTreeFrame();
@@ -76,10 +80,11 @@ protected:
 								                  nsGUIEvent*     aEvent,
 							                    nsEventStatus&  aEventStatus);
 
+  PRBool CanResize(nsPoint& aPoint);
+
 protected:
   // Data members
   PRBool mIsHeader; // Whether or not we're a column header
   nsTreeFrame* mTreeFrame; // Our parent tree frame.
   PRBool mAllowEvents; // Whether we let events go through.
-
 }; // class nsTableCellFrame