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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef UI_VIEWS_COREWM_TOOLTIP_AURA_H_
      6 #define UI_VIEWS_COREWM_TOOLTIP_AURA_H_
      7 
      8 #include "ui/gfx/screen_type_delegate.h"
      9 #include "ui/views/controls/label.h"
     10 #include "ui/views/corewm/tooltip.h"
     11 #include "ui/views/widget/widget_observer.h"
     12 
     13 namespace gfx {
     14 class FontList;
     15 }  // namespace gfx
     16 
     17 namespace views {
     18 
     19 class Widget;
     20 
     21 namespace corewm {
     22 
     23 // Implementation of Tooltip that shows the tooltip using a Widget and Label.
     24 class VIEWS_EXPORT TooltipAura : public Tooltip, public WidgetObserver {
     25  public:
     26   explicit TooltipAura(gfx::ScreenType screen_type);
     27   virtual ~TooltipAura();
     28 
     29   // Trims the tooltip to fit in the width |max_width|, setting |text| to the
     30   // clipped result, |width| to the width (in pixels) of the clipped text
     31   // and |line_count| to the number of lines of text in the tooltip. |font_list|
     32   // is used to layout |text|. |max_width| comes from GetMaxWidth().
     33   static void TrimTooltipToFit(const gfx::FontList& font_list,
     34                                int max_width,
     35                                base::string16* text,
     36                                int* width,
     37                                int* line_count);
     38 
     39  private:
     40   // Returns the max width of the tooltip when shown at the specified location.
     41   int GetMaxWidth(const gfx::Point& location) const;
     42 
     43   // Adjusts the bounds given by the arguments to fit inside the desktop
     44   // and applies the adjusted bounds to the label_.
     45   void SetTooltipBounds(const gfx::Point& mouse_pos,
     46                         int tooltip_width,
     47                         int tooltip_height);
     48 
     49   // Destroys |widget_|.
     50   void DestroyWidget();
     51 
     52   // Tooltip:
     53   virtual void SetText(aura::Window* window,
     54                        const base::string16& tooltip_text,
     55                        const gfx::Point& location) OVERRIDE;
     56   virtual void Show() OVERRIDE;
     57   virtual void Hide() OVERRIDE;
     58   virtual bool IsVisible() OVERRIDE;
     59 
     60   // WidgetObserver:
     61   virtual void OnWidgetDestroying(Widget* widget) OVERRIDE;
     62 
     63   const gfx::ScreenType screen_type_;
     64 
     65   // The label showing the tooltip.
     66   Label label_;
     67 
     68   // The widget containing the tooltip. May be NULL.
     69   Widget* widget_;
     70 
     71   // The window we're showing the tooltip for. Never NULL and valid while
     72   // showing.
     73   aura::Window* tooltip_window_;
     74 
     75   DISALLOW_COPY_AND_ASSIGN(TooltipAura);
     76 };
     77 
     78 }  // namespace corewm
     79 }  // namespace views
     80 
     81 #endif  // UI_VIEWS_COREWM_TOOLTIP_AURA_H_
     82