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// 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 "base/observer_list_types.h"
#include "ui/display/display_export.h"
namespace display {
class Display;
enum class TabletState;
// Observers for display configuration changes.
class DISPLAY_EXPORT DisplayObserver : public base::CheckedObserver {
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,
DISPLAY_METRIC_MIRROR_STATE = 1 << 5,
DISPLAY_METRIC_COLOR_SPACE = 1 << 6,
DISPLAY_METRIC_REFRESH_RATE = 1 << 7,
DISPLAY_METRIC_INTERLACED = 1 << 8,
};
// This may be called before other methods to signal changes are about to
// happen. Not all classes that support DisplayObserver call this.
virtual void OnWillProcessDisplayChanges();
// Called after OnWillProcessDisplayChanges() to indicate display changes have
// completed. Not all classes that support DisplayObserver call this.
virtual void OnDidProcessDisplayChanges();
// 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 the metrics of a display change.
// |changed_metrics| is a bitmask of DisplayMatric types indicating which
// metrics have changed. Eg; if mirroring changes (either from true to false,
// or false to true), than the DISPLAY_METRIC_MIRROR_STATE bit is set in
// changed_metrics.
virtual void OnDisplayMetricsChanged(const Display& display,
uint32_t changed_metrics);
// Called when the (platform-specific) workspace ID changes to
// |new_workspace|.
virtual void OnCurrentWorkspaceChanged(const std::string& new_workspace);
// Called when display changes between conventional and tablet mode.
virtual void OnDisplayTabletStateChanged(TabletState state);
protected:
~DisplayObserver() override;
};
} // namespace display
#endif // UI_DISPLAY_DISPLAY_OBSERVER_H_
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