Start of display management for mus

ui/views/mus/screen_mus.h

+// Copyright 2016 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_VIEWS_MUS_SCREEN_MUS_H_
+#define UI_VIEWS_MUS_SCREEN_MUS_H_
+
+#include <vector>
+
+#include "base/observer_list.h"
+#include "components/mus/public/interfaces/display.mojom.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "ui/gfx/display.h"
+#include "ui/gfx/screen.h"
+#include "ui/views/mus/mus_export.h"
+
+namespace mojo {
+class ApplicationImpl;
+}
+
+namespace views {
+
+// Screen implementation backed by mus::mojom::DisplayManager.
+class VIEWS_MUS_EXPORT ScreenMus
+    : public gfx::Screen,
+      public NON_EXPORTED_BASE(mus::mojom::DisplayManagerObserver) {
+ public:
+  ScreenMus();
+  ~ScreenMus() override;
+
+  void Init(mojo::ApplicationImpl* app);
+
+ private:
+  int FindDisplayIndexById(int64_t id) const;
+
+  // Invoked when a display changed in some weay, including being added.
+  // If |is_primary| is true, |changed_display| is the primary display.
+  void ProcessDisplayChanged(const gfx::Display& changed_display,
+                             bool is_primary);
+
+  // gfx::Screen:
+  gfx::Point GetCursorScreenPoint() override;
+  gfx::NativeWindow GetWindowUnderCursor() override;
+  gfx::NativeWindow GetWindowAtScreenPoint(const gfx::Point& point) override;
+  gfx::Display GetPrimaryDisplay() const override;
+  gfx::Display GetDisplayNearestWindow(gfx::NativeView view) const override;
+  gfx::Display GetDisplayNearestPoint(const gfx::Point& point) const override;
+  int GetNumDisplays() const override;
+  std::vector<gfx::Display> GetAllDisplays() const override;
+  gfx::Display GetDisplayMatching(const gfx::Rect& match_rect) const override;
+  void AddObserver(gfx::DisplayObserver* observer) override;
+  void RemoveObserver(gfx::DisplayObserver* observer) override;
+
+  // mus::mojom::DisplayManager:
+  void OnDisplays(mojo::Array<mus::mojom::DisplayPtr> displays) override;
+  void OnDisplaysChanged(mojo::Array<mus::mojom::DisplayPtr> display) override;
+  void OnDisplayRemoved(int64_t id) override;
+
+  mus::mojom::DisplayManagerPtr display_manager_;
+  std::vector<gfx::Display> displays_;
+  int primary_display_index_;
+  mojo::Binding<mus::mojom::DisplayManagerObserver>
+      display_manager_observer_binding_;
+  base::ObserverList<gfx::DisplayObserver> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScreenMus);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_MUS_SCREEN_MUS_H_