| // Copyright (c) 2012 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 UI_DISPLAY_DISPLAY_OBSERVER_H_ |
| #define UI_DISPLAY_DISPLAY_OBSERVER_H_ |
| |
| #include <stdint.h> |
| |
| #include "ui/display/display_export.h" |
| |
| namespace display { |
| class Display; |
| |
| // Observers for display configuration changes. |
| // TODO(oshima): consolidate |WorkAreaWatcherObserver| and |
| // |DisplaySettingsProvier|. crbug.com/122863. |
| class DISPLAY_EXPORT DisplayObserver { |
| public: |
| enum DisplayMetric { |
| DISPLAY_METRIC_NONE = 0, |
| DISPLAY_METRIC_BOUNDS = 1 << 0, |
| DISPLAY_METRIC_WORK_AREA = 1 << 1, |
| DISPLAY_METRIC_DEVICE_SCALE_FACTOR = 1 << 2, |
| DISPLAY_METRIC_ROTATION = 1 << 3, |
| DISPLAY_METRIC_PRIMARY = 1 << 4, |
| }; |
| |
| // Called when |new_display| has been added. |
| virtual void OnDisplayAdded(const Display& new_display); |
| |
| // Called when |old_display| has been removed. |
| virtual void OnDisplayRemoved(const Display& old_display); |
| |
| // Called when a |display| has one or more metrics changed. |changed_metrics| |
| // will contain the information about the change, see |DisplayMetric|. |
| virtual void OnDisplayMetricsChanged(const Display& display, |
| uint32_t changed_metrics); |
| |
| protected: |
| virtual ~DisplayObserver(); |
| }; |
| |
| } // namespace display |
| |
| #endif // UI_DISPLAY_DISPLAY_OBSERVER_H_ |