1 // Copyright (c) 2011 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_VIEWS_ACCESSIBLE_PANE_VIEW_H_ 6 #define CHROME_BROWSER_UI_VIEWS_ACCESSIBLE_PANE_VIEW_H_ 7 #pragma once 8 9 #include "base/hash_tables.h" 10 #include "base/memory/scoped_ptr.h" 11 #include "base/task.h" 12 #include "views/focus/focus_manager.h" 13 #include "views/view.h" 14 15 namespace views { 16 class FocusSearch; 17 } 18 19 // This class provides keyboard access to any view that extends it, typically 20 // a toolbar. The user sets focus to a control in this view by pressing 21 // F6 to traverse all panes, or by pressing a shortcut that jumps directly 22 // to this pane. 23 class AccessiblePaneView : public views::View, 24 public views::FocusChangeListener, 25 public views::FocusTraversable { 26 public: 27 AccessiblePaneView(); 28 virtual ~AccessiblePaneView(); 29 30 // Set focus to the pane with complete keyboard access. 31 // Focus will be restored to the ViewStorage with id |view_storage_id| 32 // if the user escapes. If |initial_focus| is not NULL, that control will get 33 // the initial focus, if it's enabled and focusable. Returns true if 34 // the pane was able to receive focus. 35 virtual bool SetPaneFocus(int view_storage_id, View* initial_focus); 36 37 // Set focus to the pane with complete keyboard access, with the 38 // focus initially set to the default child. Focus will be restored 39 // to the ViewStorage with id |view_storage_id| if the user escapes. 40 // Returns true if the pane was able to receive focus. 41 virtual bool SetPaneFocusAndFocusDefault(int view_storage_id); 42 43 // Overridden from views::View: 44 virtual FocusTraversable* GetPaneFocusTraversable() OVERRIDE; 45 virtual bool AcceleratorPressed(const views::Accelerator& accelerator) 46 OVERRIDE; 47 virtual void SetVisible(bool flag) OVERRIDE; 48 virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE; 49 50 // Overridden from views::FocusChangeListener: 51 virtual void FocusWillChange(View* focused_before, 52 View* focused_now) OVERRIDE; 53 54 // Overridden from views::FocusTraversable: 55 virtual views::FocusSearch* GetFocusSearch() OVERRIDE; 56 virtual FocusTraversable* GetFocusTraversableParent() OVERRIDE; 57 virtual View* GetFocusTraversableParentView() OVERRIDE; 58 59 protected: 60 // A subclass can override this to provide a default focusable child 61 // other than the first focusable child. 62 virtual views::View* GetDefaultFocusableChild(); 63 64 // Remove pane focus. 65 virtual void RemovePaneFocus(); 66 67 // Select all text in the location bar 68 virtual void LocationBarSelectAll(); 69 70 void RestoreLastFocusedView(); 71 72 View* GetFirstFocusableChild(); 73 View* GetLastFocusableChild(); 74 75 bool pane_has_focus_; 76 77 ScopedRunnableMethodFactory<AccessiblePaneView> method_factory_; 78 79 // Save the focus manager rather than calling GetFocusManager(), 80 // so that we can remove focus listeners in the destructor. 81 views::FocusManager* focus_manager_; 82 83 // Our custom focus search implementation that traps focus in this 84 // pane and traverses all views that are focusable for accessibility, 85 // not just those that are normally focusable. 86 scoped_ptr<views::FocusSearch> focus_search_; 87 88 // Registered accelerators 89 views::Accelerator home_key_; 90 views::Accelerator end_key_; 91 views::Accelerator escape_key_; 92 views::Accelerator left_key_; 93 views::Accelerator right_key_; 94 95 // Last focused view that issued this traversal. 96 int last_focused_view_storage_id_; 97 98 DISALLOW_COPY_AND_ASSIGN(AccessiblePaneView); 99 }; 100 101 #endif // CHROME_BROWSER_UI_VIEWS_ACCESSIBLE_PANE_VIEW_H_ 102
