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Diffstat (limited to 'chrome/browser/ui/views/accessible_pane_view.h')
-rw-r--r-- | chrome/browser/ui/views/accessible_pane_view.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/chrome/browser/ui/views/accessible_pane_view.h b/chrome/browser/ui/views/accessible_pane_view.h new file mode 100644 index 0000000..349fc0d --- /dev/null +++ b/chrome/browser/ui/views/accessible_pane_view.h @@ -0,0 +1,100 @@ +// Copyright (c) 2010 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 CHROME_BROWSER_UI_VIEWS_ACCESSIBLE_PANE_VIEW_H_ +#define CHROME_BROWSER_UI_VIEWS_ACCESSIBLE_PANE_VIEW_H_ +#pragma once + +#include "base/hash_tables.h" +#include "base/scoped_ptr.h" +#include "base/task.h" +#include "views/focus/focus_manager.h" +#include "views/view.h" + +namespace views { +class FocusSearch; +} + +// This class provides keyboard access to any view that extends it, typically +// a toolbar. The user sets focus to a control in this view by pressing +// F6 to traverse all panes, or by pressing a shortcut that jumps directly +// to this pane. +class AccessiblePaneView : public views::View, + public views::FocusChangeListener, + public views::FocusTraversable { + public: + AccessiblePaneView(); + virtual ~AccessiblePaneView(); + + // Set focus to the pane with complete keyboard access. + // Focus will be restored to the ViewStorage with id |view_storage_id| + // if the user escapes. If |initial_focus| is not NULL, that control will get + // the initial focus, if it's enabled and focusable. Returns true if + // the pane was able to receive focus. + virtual bool SetPaneFocus(int view_storage_id, View* initial_focus); + + // Set focus to the pane with complete keyboard access, with the + // focus initially set to the default child. Focus will be restored + // to the ViewStorage with id |view_storage_id| if the user escapes. + // Returns true if the pane was able to receive focus. + virtual bool SetPaneFocusAndFocusDefault(int view_storage_id); + + // Overridden from views::View: + virtual FocusTraversable* GetPaneFocusTraversable(); + virtual bool AcceleratorPressed(const views::Accelerator& accelerator); + virtual void SetVisible(bool flag); + virtual AccessibilityTypes::Role GetAccessibleRole(); + + // Overridden from views::FocusChangeListener: + virtual void FocusWillChange(View* focused_before, + View* focused_now); + + // Overridden from views::FocusTraversable: + virtual views::FocusSearch* GetFocusSearch(); + virtual FocusTraversable* GetFocusTraversableParent(); + virtual View* GetFocusTraversableParentView(); + + protected: + // A subclass can override this to provide a default focusable child + // other than the first focusable child. + virtual views::View* GetDefaultFocusableChild() { return NULL; } + + // Remove pane focus. + virtual void RemovePaneFocus(); + + // Select all text in the location bar + virtual void LocationBarSelectAll(); + + void RestoreLastFocusedView(); + + View* GetFirstFocusableChild(); + View* GetLastFocusableChild(); + + bool pane_has_focus_; + + ScopedRunnableMethodFactory<AccessiblePaneView> method_factory_; + + // Save the focus manager rather than calling GetFocusManager(), + // so that we can remove focus listeners in the destructor. + views::FocusManager* focus_manager_; + + // Our custom focus search implementation that traps focus in this + // pane and traverses all views that are focusable for accessibility, + // not just those that are normally focusable. + scoped_ptr<views::FocusSearch> focus_search_; + + // Registered accelerators + views::Accelerator home_key_; + views::Accelerator end_key_; + views::Accelerator escape_key_; + views::Accelerator left_key_; + views::Accelerator right_key_; + + // Last focused view that issued this traversal. + int last_focused_view_storage_id_; + + DISALLOW_COPY_AND_ASSIGN(AccessiblePaneView); +}; + +#endif // CHROME_BROWSER_UI_VIEWS_ACCESSIBLE_PANE_VIEW_H_ |