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      1 // Copyright 2014 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 CHROME_BROWSER_UI_ASH_ACCESSIBILITY_AUTOMATION_MANAGER_ASH_H_
      6 #define CHROME_BROWSER_UI_ASH_ACCESSIBILITY_AUTOMATION_MANAGER_ASH_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/memory/scoped_ptr.h"
     10 
     11 #include "chrome/browser/extensions/api/automation_internal/automation_action_adapter.h"
     12 #include "chrome/browser/ui/ash/accessibility/ax_tree_source_ash.h"
     13 #include "ui/accessibility/ax_tree_serializer.h"
     14 
     15 template <typename T> struct DefaultSingletonTraits;
     16 
     17 namespace content {
     18 class BrowserContext;
     19 }  // namespace content
     20 
     21 namespace views {
     22 class AXAuraObjWrapper;
     23 class View;
     24 }  // namespace views
     25 
     26 // Manages a tree of automation nodes.
     27 class AutomationManagerAsh : public extensions::AutomationActionAdapter {
     28  public:
     29   // Get the single instance of this class.
     30   static AutomationManagerAsh* GetInstance();
     31 
     32   // Enable automation support for views.
     33   void Enable(content::BrowserContext* context);
     34 
     35   // Disable automation support for views.
     36   void Disable();
     37 
     38   // Handle an event fired upon a |View|.
     39   void HandleEvent(content::BrowserContext* context,
     40                    views::View* view,
     41                    ui::AXEvent event_type);
     42 
     43   // AutomationActionAdapter implementation.
     44   virtual void DoDefault(int32 id) OVERRIDE;
     45   virtual void Focus(int32 id) OVERRIDE;
     46   virtual void MakeVisible(int32 id) OVERRIDE;
     47   virtual void SetSelection(int32 id, int32 start, int32 end) OVERRIDE;
     48 
     49  protected:
     50   virtual ~AutomationManagerAsh();
     51 
     52  private:
     53   friend struct DefaultSingletonTraits<AutomationManagerAsh>;
     54 
     55   AutomationManagerAsh();
     56 
     57     // Reset all state in this manager.
     58   void Reset();
     59 
     60   void SendEvent(content::BrowserContext* context,
     61                  views::AXAuraObjWrapper* aura_obj,
     62                  ui::AXEvent event_type);
     63 
     64   // Whether automation support for views is enabled.
     65   bool enabled_;
     66 
     67   // Holds the active views-based accessibility tree. A tree currently consists
     68   // of all views descendant to a |Widget| (see |AXTreeSourceViews|).
     69   // A tree becomes active when an event is fired on a descendant view.
     70   scoped_ptr <AXTreeSourceAsh> current_tree_;
     71 
     72   // Serializes incremental updates on the currently active tree
     73   // |current_tree_|.
     74   scoped_ptr<ui::AXTreeSerializer<views::AXAuraObjWrapper*> >
     75       current_tree_serializer_;
     76 
     77   DISALLOW_COPY_AND_ASSIGN(AutomationManagerAsh);
     78 };
     79 
     80 #endif  // CHROME_BROWSER_UI_ASH_ACCESSIBILITY_AUTOMATION_MANAGER_ASH_H_
     81