Fleshes out the tooltip implementation for views on Gtk. It doesn't...

views/widget/tooltip_manager.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef VIEWS_WIDGET_TOOLTIP_MANAGER_H_
 #define VIEWS_WIDGET_TOOLTIP_MANAGER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 14 matching lines @@
   // Returns the height of tooltips. This should only be invoked from within
   // GetTooltipTextOrigin.
   static int GetTooltipHeight();
 
   // Returns the default font used by tooltips.
   static gfx::Font GetDefaultFont();
 
   // Returns the separator for lines of text in a tooltip.
   static const std::wstring& GetLineSeparator();
 
+  // Returns the maximum width of the tooltip. |x| and |y| give the location
+  // the tooltip is to be displayed on in screen coordinates.
+  static int GetMaxWidth(int x, int y);
+
   TooltipManager() {}
   virtual ~TooltipManager() {}
 
   // Notification that the view hierarchy has changed in some way.
   virtual void UpdateTooltip() = 0;
 
   // Invoked when the tooltip text changes for the specified views.
   virtual void TooltipTextChanged(View* view) = 0;
 
   // Invoked when toolbar icon gets focus.
   virtual void ShowKeyboardTooltip(View* view) = 0;
 
   // Invoked when toolbar loses focus.
   virtual void HideKeyboardTooltip() = 0;
+
+ protected:
+  // Trims the tooltip to fit, setting |text| to the clipped result,
+  // |max_width| to the width (in pixels) of the clipped text and |line_count|
+  // to the number of lines of text in the tooltip. |x| and |y| give the
+  // location of the tooltip in screen coordinates.
+  static void TrimTooltipToFit(std::wstring* text,
+                               int* max_width,
+                               int* line_count,
+                               int x,
+                               int y);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_WIDGET_TOOLTIP_MANAGER_H_