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ash / display / output_protection_delegate.h [blame]

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef ASH_DISPLAY_OUTPUT_PROTECTION_DELEGATE_H_
#define ASH_DISPLAY_OUTPUT_PROTECTION_DELEGATE_H_

#include <stdint.h>

#include <memory>
#include <optional>

#include "ash/ash_export.h"
#include "base/memory/raw_ptr.h"
#include "ui/aura/window.h"
#include "ui/aura/window_observer.h"
#include "ui/display/display_observer.h"
#include "ui/display/types/display_constants.h"

namespace ash {

// Proxies output protection requests for an associated window, and renews them
// when the window is reparented to another display.
class ASH_EXPORT OutputProtectionDelegate : public aura::WindowObserver,
                                            public display::DisplayObserver {
 public:
  using QueryStatusCallback = base::OnceCallback<
      void(bool success, uint32_t connection_mask, uint32_t protection_mask)>;
  using SetProtectionCallback = base::OnceCallback<void(bool success)>;

  explicit OutputProtectionDelegate(aura::Window* window);

  OutputProtectionDelegate(const OutputProtectionDelegate&) = delete;
  OutputProtectionDelegate& operator=(const OutputProtectionDelegate&) = delete;

  ~OutputProtectionDelegate() override;

  void QueryStatus(QueryStatusCallback callback);
  void SetProtection(uint32_t protection_mask, SetProtectionCallback callback);

 private:
  // display::DisplayObserver:
  void OnDisplayMetricsChanged(const display::Display& display,
                               uint32_t changed_metrics) override;

  // aura::WindowObserver:
  void OnWindowHierarchyChanged(
      const aura::WindowObserver::HierarchyChangeParams& params) override;
  void OnWindowDestroying(aura::Window* window) override;

  // Called when `window_` may have become a descendant of a different root
  // window (on a different display), or a descendant of a different window
  // (e.g. a browser window when `window_` is for a tab that has become active).
  void OnWindowMayHaveMovedToAnotherDisplayOrWindow();

  bool RegisterClientIfNecessary();

  // Native window being observed.
  raw_ptr<aura::Window> window_ = nullptr;

  // Display ID of the observed window.
  int64_t display_id_;

  // Last requested ContentProtectionMethod bitmask, applied when the observed
  // window moves to another display.
  uint32_t protection_mask_ = display::CONTENT_PROTECTION_METHOD_NONE;

  // RAII wrapper to register/unregister ContentProtectionManager client.
  struct ClientIdHolder;
  std::unique_ptr<ClientIdHolder> client_;

  std::optional<display::ScopedDisplayObserver> display_observer_{this};
};

}  // namespace ash

#endif  // ASH_DISPLAY_OUTPUT_PROTECTION_DELEGATE_H_