Basic display management for mus

components/mus/ws/platform_screen_impl_ozone.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 COMPONENTS_MUS_WS_PLATFORM_SCREEN_IMPL_OZONE_H_
+#define COMPONENTS_MUS_WS_PLATFORM_SCREEN_IMPL_OZONE_H_
+
+#include <stdint.h>
+
+#include <vector>
+
+#include "base/callback.h"
+#include "base/memory/weak_ptr.h"
+#include "components/mus/ws/platform_screen.h"
+#include "ui/display/types/native_display_observer.h"
+#include "ui/gfx/geometry/rect.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace ui {
+class NativeDisplayDelegate;
+class DisplaySnapshot;
+}
+
+namespace mus {
+namespace ws {
+
+// PlatformScreenImplOzone provides the necessary functionality to configure all
+// attached physical displays on the ozone platform.
+class PlatformScreenImplOzone : public PlatformScreen,
+                                public ui::NativeDisplayObserver {
+ public:
+  PlatformScreenImplOzone();
+  ~PlatformScreenImplOzone() override;
+
+ private:
+  // PlatformScreen
+  void Init() override;  // Must not be called until after the ozone platform is
+                         // initialized.
+  void ConfigurePhysicalDisplay(
+      const ConfiguredDisplayCallback& callback) override;
+
+  // TODO(rjkroege): NativeDisplayObserver is misnamed as it tracks changes in
+  // the physical "Screen".  Consider renaming it to NativeScreenObserver.
+  // ui::NativeDisplayObserver:
+  void OnConfigurationChanged() override;
+
+  // Display management callback.
+  void OnDisplaysAquired(const ConfiguredDisplayCallback& callback,
+                         const std::vector<ui::DisplaySnapshot*>& displays);
+
+  std::unique_ptr<ui::NativeDisplayDelegate> native_display_delegate_;
+
+  base::WeakPtrFactory<PlatformScreenImplOzone> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PlatformScreenImplOzone);
+};
+
+}  // namespace ws
+}  // namespace mus
+
+#endif  // COMPONENTS_MUS_WS_PLATFORM_SCREEN_IMPL_OZONE_H_