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// Copyright 2013 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_MANAGER_DISPLAY_CHANGE_OBSERVER_H_
#define UI_DISPLAY_MANAGER_DISPLAY_CHANGE_OBSERVER_H_
#include <stdint.h>
#include "base/macros.h"
#include "ui/display/manager/display_configurator.h"
#include "ui/display/manager/display_manager_export.h"
#include "ui/display/manager/managed_display_info.h"
#include "ui/events/devices/input_device_event_observer.h"
namespace display {
class DisplayManager;
class DisplaySnapshot;
// An object that observes changes in display configuration and updates
// DisplayManager.
class DISPLAY_MANAGER_EXPORT DisplayChangeObserver
: public DisplayConfigurator::StateController,
public DisplayConfigurator::Observer,
public ui::InputDeviceEventObserver {
public:
// Returns the mode list for internal display.
DISPLAY_EXPORT static ManagedDisplayInfo::ManagedDisplayModeList
GetInternalManagedDisplayModeList(const ManagedDisplayInfo& display_info,
const DisplaySnapshot& output);
// Returns the resolution list.
DISPLAY_EXPORT static ManagedDisplayInfo::ManagedDisplayModeList
GetExternalManagedDisplayModeList(const DisplaySnapshot& output);
explicit DisplayChangeObserver(DisplayManager* display_manager);
~DisplayChangeObserver() override;
// DisplayConfigurator::StateController overrides:
MultipleDisplayState GetStateForDisplayIds(
const DisplayConfigurator::DisplayStateList& outputs) override;
bool GetSelectedModeForDisplayId(int64_t display_id,
ManagedDisplayMode* out_mode) const override;
// Overriden from DisplayConfigurator::Observer:
void OnDisplayModeChanged(
const DisplayConfigurator::DisplayStateList& outputs) override;
void OnDisplayModeChangeFailed(
const DisplayConfigurator::DisplayStateList& displays,
MultipleDisplayState failed_new_state) override;
// Overriden from ui::InputDeviceEventObserver:
void OnInputDeviceConfigurationChanged(uint8_t input_device_types) override;
// Exposed for testing.
DISPLAY_EXPORT static float FindDeviceScaleFactor(
float dpi,
const gfx::Size& size_in_pixels);
private:
friend class DisplayChangeObserverTest;
void UpdateInternalDisplay(
const DisplayConfigurator::DisplayStateList& display_states);
ManagedDisplayInfo CreateManagedDisplayInfo(const DisplaySnapshot* snapshot,
const DisplayMode* mode_info);
// |display_manager_| is not owned and must outlive DisplayChangeObserver.
DisplayManager* display_manager_;
DISALLOW_COPY_AND_ASSIGN(DisplayChangeObserver);
};
} // namespace display
#endif // UI_DISPLAY_MANAGER_DISPLAY_CHANGE_OBSERVER_H_
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