mozart: Initial commit of the view manager.

services/ui/view_manager/view_state.cc

+// 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.
+
+#include "base/logging.h"
+#include "services/ui/view_manager/view_state.h"
+#include "services/ui/view_manager/view_tree_state.h"
+
+namespace view_manager {
+
+ViewState::ViewState(mojo::ui::ViewPtr view, uint32_t view_token_value)
+    : view_(view.Pass()),
+      view_token_value_(view_token_value),
+      tree_(nullptr),
+      parent_(nullptr),
+      key_(0),
+      weak_factory_(this) {
+  DCHECK(view_);
+}
+
+ViewState::~ViewState() {}
+
+void ViewState::SetTree(ViewTreeState* tree, uint32_t key) {
+  DCHECK(tree);
+  DCHECK(!parent_);  // must be the root
+  if (tree_ != tree) {
+    SetTreeUnchecked(tree);
+  }
+  key_ = key;
+}
+
+void ViewState::SetTreeUnchecked(ViewTreeState* tree) {
+  tree_ = tree;
+  for (const auto& pair : children_) {
+    pair.second->SetTreeUnchecked(tree);
+  }
+}
+
+void ViewState::SetParent(ViewState* parent, uint32_t key) {
+  DCHECK(parent);
+  parent_ = parent;
+  key_ = key;
+  SetTreeUnchecked(parent->tree_);
+}
+
+void ViewState::ResetContainer() {
+  parent_ = nullptr;
+  key_ = 0;
+  SetTreeUnchecked(nullptr);
+}
+
+void ViewState::GetServiceProvider(
+    mojo::InterfaceRequest<mojo::ServiceProvider> service_provider) {}
+
+}  // namespace view_manager