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mojo/services/view_manager/ids.h

+// Copyright 2014 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_VIEW_MANAGER_IDS_H_
+#define SERVICES_VIEW_MANAGER_IDS_H_
+
+#include "third_party/mojo_services/src/view_manager/public/cpp/types.h"
+#include "third_party/mojo_services/src/view_manager/public/cpp/util.h"
+
+namespace view_manager {
+
+// Connection id is used to indicate no connection. That is, no
+// ViewManagerServiceImpl ever gets this id.
+const mojo::ConnectionSpecificId kInvalidConnectionId = 0;
+
+// Adds a bit of type safety to view ids.
+struct ViewId {
+  ViewId(mojo::ConnectionSpecificId connection_id,
+         mojo::ConnectionSpecificId view_id)
+      : connection_id(connection_id), view_id(view_id) {}
+  ViewId() : connection_id(0), view_id(0) {}
+
+  bool operator==(const ViewId& other) const {
+    return other.connection_id == connection_id &&
+        other.view_id == view_id;
+  }
+
+  bool operator!=(const ViewId& other) const {
+    return !(*this == other);
+  }
+
+  mojo::ConnectionSpecificId connection_id;
+  mojo::ConnectionSpecificId view_id;
+};
+
+inline ViewId ViewIdFromTransportId(mojo::Id id) {
+  return ViewId(mojo::HiWord(id), mojo::LoWord(id));
+}
+
+inline mojo::Id ViewIdToTransportId(const ViewId& id) {
+  return (id.connection_id << 16) | id.view_id;
+}
+
+inline ViewId RootViewId() {
+  return ViewId(kInvalidConnectionId, 1);
+}
+
+// Returns a ViewId that is reserved to indicate no view. That is, no view will
+// ever be created with this id.
+inline ViewId InvalidViewId() {
+  return ViewId(kInvalidConnectionId, 0);
+}
+
+// All cloned views use this id.
+inline ViewId ClonedViewId() {
+  return ViewId(kInvalidConnectionId, 2);
+}
+
+}  // namespace view_manager
+
+#endif  // SERVICES_VIEW_MANAGER_IDS_H_