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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ASH_POLICY_DISPLAY_DISPLAY_SETTINGS_HANDLER_H_
#define CHROME_BROWSER_ASH_POLICY_DISPLAY_DISPLAY_SETTINGS_HANDLER_H_
#include <memory>
#include <vector>
#include "base/memory/weak_ptr.h"
#include "chromeos/ash/components/settings/cros_settings.h"
#include "chromeos/crosapi/mojom/cros_display_config.mojom.h"
#include "mojo/public/cpp/bindings/associated_receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
namespace policy {
// Provides an interface for display configuration policies. Each policy should
// provide a handler that implements this interface and register it in
// the |DisplaySettingsHandler| instance.
class DisplaySettingsPolicyHandler {
public:
virtual ~DisplaySettingsPolicyHandler() = default;
// Returns a name of setting stored in CrosSettings that should be used to
// subscribe to setting changes for this policy.
virtual const char* SettingName() = 0;
// Is called on each setting update before |ApplyChanges| to provide
// updated settings for the handler.
virtual void OnSettingUpdate() = 0;
// Applies settings enforced by the policy to each display from |info_list|.
// Is called on each configuration change or settings update.
virtual void ApplyChanges(
crosapi::mojom::CrosDisplayConfigController* cros_display_config,
const std::vector<crosapi::mojom::DisplayUnitInfoPtr>& info_list) = 0;
};
// Enforces the settings controlled by device policies related to display
// configuration (i.e. DisplayRotationDefault, DeviceDisplayResolution)
// On construction this class registers itself with
// crosapi::mojom::CrosDisplayConfigObserver for display changes and with
// CrosSettings for settings changes. Every display configuration policy
// provides a handler class inherited from |DisplaySettingsPolicyHandler|
// and is registered in |DisplaySettingsHandler| instance.
// see |DisplayResolutionHandler| and |DisplayRotationDefaultHandler|
class DisplaySettingsHandler
: public crosapi::mojom::CrosDisplayConfigObserver {
public:
// This class must be constructed after CrosSettings is initialized.
DisplaySettingsHandler();
DisplaySettingsHandler(const DisplaySettingsHandler&) = delete;
DisplaySettingsHandler& operator=(const DisplaySettingsHandler&) = delete;
~DisplaySettingsHandler() override;
// crosapi::mojom::CrosDisplayConfigObserver
void OnDisplayConfigChanged() override;
// Registers handler for some policy-controlled setting. All handlers must be
// registered before calling |Start|.
void RegisterHandler(std::unique_ptr<DisplaySettingsPolicyHandler> handler);
// Subscribes to all needed events and initiates initial display configuration
// fetching to apply the settings controlled by registered handlers.
void Start();
private:
// Receives the initial display info list and initializes the class.
void OnGetInitialDisplayInfo(
std::vector<crosapi::mojom::DisplayUnitInfoPtr> info_list);
// Requests the list of displays and applies each setting.
void RequestDisplaysAndApplyChanges();
// Apply all default settings defined by policies to all connected displays.
void ApplyChanges(std::vector<crosapi::mojom::DisplayUnitInfoPtr> info_list);
// Called on each update of the setting provided by |handler|. Requests the
// list of displays and applies |handler| to each display.
void OnSettingUpdate(DisplaySettingsPolicyHandler* handler);
// Applies |handler| to each display from |info_list|.
void UpdateSettingAndApplyChanges(
DisplaySettingsPolicyHandler* handler,
const std::vector<crosapi::mojom::DisplayUnitInfoPtr>& info_list);
// Called on display configuration changes for each handler.
void OnConfigurationChangeForHandler(
DisplaySettingsPolicyHandler* handler,
std::vector<crosapi::mojom::DisplayUnitInfoPtr> info_list);
// Provides access to the current display configurations, both for reading and
// updating.
mojo::Remote<crosapi::mojom::CrosDisplayConfigController>
cros_display_config_;
std::vector<std::unique_ptr<DisplaySettingsPolicyHandler>> handlers_;
mojo::AssociatedReceiver<crosapi::mojom::CrosDisplayConfigObserver>
cros_display_config_observer_receiver_{this};
std::vector<base::CallbackListSubscription> settings_subscriptions_;
bool started_ = false;
// Must be the last member.
base::WeakPtrFactory<DisplaySettingsHandler> weak_ptr_factory_{this};
};
} // namespace policy
#endif // CHROME_BROWSER_ASH_POLICY_DISPLAY_DISPLAY_SETTINGS_HANDLER_H_
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