mozart: Initial commit of the view manager.

services/ui/view_manager/view_tree_host_impl.h

+// Copyright 2015 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 SERVICES_UI_VIEW_MANAGER_VIEW_TREE_HOST_IMPL_H_
+#define SERVICES_UI_VIEW_MANAGER_VIEW_TREE_HOST_IMPL_H_
+
+#include "base/macros.h"
+#include "mojo/public/cpp/bindings/binding.h"
+#include "mojo/services/ui/views/interfaces/view_trees.mojom.h"
+#include "services/ui/view_manager/view_registry.h"
+#include "services/ui/view_manager/view_tree_state.h"
+
+namespace view_manager {
+
+// ViewTreeHost interface implementation.
+// This object is owned by its associated ViewTreeState.
+class ViewTreeHostImpl : public mojo::ui::ViewTreeHost {
+ public:
+  ViewTreeHostImpl(
+      ViewRegistry* registry,
+      ViewTreeState* state,
+      mojo::InterfaceRequest<mojo::ui::ViewTreeHost> view_tree_host_request);
+  ~ViewTreeHostImpl() override;
+
+  void set_view_tree_host_connection_error_handler(
+      const base::Closure& handler) {
+    binding_.set_connection_error_handler(handler);
+  }
+
+ private:
+  // |ViewTreeHost|:
+  void RequestLayout() override;
+  void SetRoot(uint32_t root_key,
+               mojo::ui::ViewTokenPtr root_view_token) override;
+  void ResetRoot() override;
+  void LayoutRoot(mojo::ui::ViewLayoutParamsPtr root_layout_params,
+                  const LayoutRootCallback& callback) override;
+
+  ViewRegistry* const registry_;
+  ViewTreeState* const state_;
+  mojo::Binding<mojo::ui::ViewTreeHost> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(ViewTreeHostImpl);
+};
+
+}  // namespace view_manager
+
+#endif  // SERVICES_UI_VIEW_MANAGER_VIEW_TREE_HOST_IMPL_H_