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// Copyright (c) 2009 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_VIEWS_ACCESSIBLE_TOOLBAR_VIEW_H_
#define CHROME_BROWSER_VIEWS_ACCESSIBLE_TOOLBAR_VIEW_H_
#include "views/view.h"
// This class provides keyboard access to any view that extends it by intiating
// ALT+SHIFT+T. And once you press TAB or SHIFT-TAB, it will traverse all the
// toolbars within Chrome. Child views are traversed in the order they were
// added.
class AccessibleToolbarView : public views::View {
public:
AccessibleToolbarView();
virtual ~AccessibleToolbarView();
// Initiate the traversal on the toolbar. The last focused view is stored in
// the ViewStorage with the corresponding |view_storage_id|.
void InitiateTraversal(int view_storage_id);
// Overridden from views::View:
virtual void DidGainFocus();
virtual void WillLoseFocus();
virtual bool OnKeyPressed(const views::KeyEvent& e);
virtual bool OnKeyReleased(const views::KeyEvent& e);
virtual bool SkipDefaultKeyEventProcessing(const views::KeyEvent& e);
virtual void ShowContextMenu(int x, int y, bool is_mouse_gesture);
virtual void RequestFocus();
virtual bool GetAccessibleName(std::wstring* name);
virtual bool GetAccessibleRole(AccessibilityTypes::Role* role);
virtual void SetAccessibleName(const std::wstring& name);
virtual void ViewHierarchyChanged(bool is_add, View* parent, View* child);
virtual View* GetAccFocusedChildView() { return selected_focused_view_; }
protected:
// Returns the next accessible view on the toolbar, starting from the given
// |view_index|. |forward| when true means it will navigate from left to right
// and vice versa when false. If |view_index| is -1 the first accessible child
// is returned.
views::View* GetNextAccessibleView(int view_index, bool forward);
// Invoked from GetNextAccessibleViewIndex to determine if |view| can be
// traversed to. Default implementation returns true, override to return false
// for views you don't want reachable.
virtual bool IsAccessibleViewTraversable(views::View* view);
private:
// Sets the focus to the currently |acc_focused_view_| view.
void SetFocusToAccessibleView();
// Retrieve the focused view from the storage so we can request focus back
// to it. If |focus_view| is null, we place focus on the default view.
// |selected_focused_view_| doesn't need to reset here since it will be
// dealt within the WillLoseFocus method.
void SetFocusToLastFocusedView();
// Storage of strings needed for accessibility.
std::wstring accessible_name_;
// Selected child view currently having accessibility focus.
views::View* selected_focused_view_;
// Last focused view that issued this traversal.
int last_focused_view_storage_id_;
DISALLOW_COPY_AND_ASSIGN(AccessibleToolbarView);
};
#endif // CHROME_BROWSER_VIEWS_ACCESSIBLE_TOOLBAR_VIEW_H_
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