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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                         const gfx::Size& tooltip_size);
     47 
     48   // Destroys |widget_|.
     49   void DestroyWidget();
     50 
     51   // Tooltip:
     52   virtual void SetText(aura::Window* window,
     53                        const base::string16& tooltip_text,
     54                        const gfx::Point& location) OVERRIDE;
     55   virtual void Show() OVERRIDE;
     56   virtual void Hide() OVERRIDE;
     57   virtual bool IsVisible() OVERRIDE;
     58 
     59   // WidgetObserver:
     60   virtual void OnWidgetDestroying(Widget* widget) OVERRIDE;
     61 
     62   const gfx::ScreenType screen_type_;
     63 
     64   // The label showing the tooltip.
     65   Label label_;
     66 
     67   // The widget containing the tooltip. May be NULL.
     68   Widget* widget_;
     69 
     70   // The window we're showing the tooltip for. Never NULL and valid while
     71   // showing.
     72   aura::Window* tooltip_window_;
     73 
     74   DISALLOW_COPY_AND_ASSIGN(TooltipAura);
     75 };
     76 
     77 }  // namespace corewm
     78 }  // namespace views
     79 
     80 #endif  // UI_VIEWS_COREWM_TOOLTIP_AURA_H_
     81