Refactor Tooltip's in Deskbar.

Only update the tooltip if the mouse goes over a new menu item making
sure to exit if the item is NULL, there is a visible label, or it is the
same item. If the mouse moves outside the view reset the last item to
NULL.

* Rename DrawLabel() and SetDrawLabel() to HasLabel() and SetHasLabel()
  to make it clear what these methods are setting a getting and setting
  a bool and not doing the actual work for drawing the label.

src/apps/deskbar/ExpandoMenuBar.cpp

@@ -45,6 +45,7 @@ All rights reserved.
 #include <NodeInfo.h>
 #include <Roster.h>
 #include <Screen.h>
+#include <ToolTip.h>
 
 #include "BarApp.h"
 #include "BarMenuTitle.h"
@@ -395,19 +396,43 @@ TExpandoMenuBar::MouseMoved(BPoint where, uint32 code, const BMessage* message)
 		// force a cleanup
 		_FinishedDrag();
 
-		if (code == B_INSIDE_VIEW) {
-			TTeamMenuItem* item = TeamItemAtPoint(where);
+		switch (code) {
+			case B_ENTERED_VIEW:
+			case B_INSIDE_VIEW:
+			{
+				TTeamMenuItem* item = TeamItemAtPoint(where);
+				if (item == NULL) {
+					// item is NULL, break out
+					fLastMousedOverItem = NULL;
+					break;
+				}
 
-			if (item != NULL) {
-				if (!item->DrawLabel() && item != fLastMousedOverItem) {
-					// set the tooltip
-					SetToolTip(item->Name());
-				} else
+				if (item->HasLabel()) {
+					// item has a visible label, set the item and break out
 					fLastMousedOverItem = item;
+					break;
+				}
+
+				if (item == fLastMousedOverItem) {
+					// already set the tooltip for this item, break out
+					break;
+				}
+
+				// new item, update the tooltip with the item name
+				SetToolTip(item->Name());
+
+				// save the current item for the next MouseMoved() call
+				fLastMousedOverItem = item;
+
+				break;
 			}
+
+			case B_OUTSIDE_VIEW:
+			case B_EXITED_VIEW:
+				fLastMousedOverItem = NULL;
+				break;
 		}
 
-		fLastMousedOverItem = NULL;
 		BMenuBar::MouseMoved(where, code, message);
 		return;
 	}

src/apps/deskbar/TeamMenuItem.cpp

@@ -171,14 +171,14 @@ TTeamMenuItem::SetOverrideSelected(bool selected)
 
 
 bool
-TTeamMenuItem::DrawLabel() const
+TTeamMenuItem::HasLabel() const
 {
 	return fDrawLabel;
 }
 
 
 void
-TTeamMenuItem::SetDrawLabel(bool drawLabel)
+TTeamMenuItem::SetHasLabel(bool drawLabel)
 {
 	fDrawLabel = drawLabel;
 }

src/apps/deskbar/TeamMenuItem.h

@@ -64,8 +64,8 @@ class TTeamMenuItem : public BMenuItem {
 		void SetOverrideHeight(float height);
 		void SetOverrideSelected(bool selected);
 
-		bool DrawLabel() const;
-		void SetDrawLabel(bool drawLabel);
+		bool HasLabel() const;
+		void SetHasLabel(bool drawLabel);
 
 		bool IsExpanded();
 		void ToggleExpandState(bool resizeWindow);