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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef CHROME_BROWSER_VIEWS_EXTERNAL_FOCUS_TRACKER_H__
#define CHROME_BROWSER_VIEWS_EXTERNAL_FOCUS_TRACKER_H__
#include "chrome/views/focus_manager.h"
namespace ChromeViews {
class View;
class ViewStorage;
// ExternalFocusTracker tracks the last focused view which belongs to the
// provided focus manager and is not either the provided parent view or one of
// its descendants. This is generally used if the parent view want to return
// focus to some other view once it is dismissed. The parent view and the focus
// manager must exist for the duration of the tracking. If the focus manager
// must be deleted before this object is deleted, make sure to call
// SetFocusManager(NULL) first.
//
// Typical use: When a view is added to the view hierarchy, it instantiates an
// ExternalFocusTracker and passes in itself and its focus manager. Then,
// when that view wants to return focus to the last focused view which is not
// itself and not a descandant of itself, (usually when it is being closed)
// it calls FocusLastFocusedExternalView.
class ExternalFocusTracker : public FocusChangeListener {
public:
ExternalFocusTracker(View* parent_view, FocusManager* focus_manager);
virtual ~ExternalFocusTracker();
// FocusChangeListener implementation.
virtual void FocusWillChange(View* focused_before, View* focused_now);
// Focuses last focused view which is not a child of parent view and is not
// parent view itself. Returns true if focus for a view was requested, false
// otherwise.
void FocusLastFocusedExternalView();
// Sets the focus manager whose focus we are tracking. |focus_manager| can
// be NULL, but no focus changes will be tracked. This is useful if the focus
// manager went away, but you might later want to start tracking with a new
// manager later, or call FocusLastFocusedExternalView to focus the previous
// view.
void SetFocusManager(ChromeViews::FocusManager* focus_manager);
private:
// Store the provided view. This view will be focused when
// FocusLastFocusedExternalView is called.
void StoreLastFocusedView(View* view);
// Store the currently focused view for our view manager and register as a
// listener for future focus changes.
void StartTracking();
// Focus manager which we are a listener for.
FocusManager* focus_manager_;
// ID of the last focused view, which we store in view_storage_.
int last_focused_view_storage_id_;
// Used to store the last focused view which is not a child of
// ExternalFocusTracker.
ViewStorage* view_storage_;
// The parent view of views which we should not track focus changes to. We
// also do not track changes to parent_view_ itself.
View* parent_view_;
DISALLOW_EVIL_CONSTRUCTORS(ExternalFocusTracker);
};
} // namespace
#endif // CHROME_BROWSER_VIEWS_EXTERNAL_FOCUS_TRACKER_H__
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