mozart: Initial commit of the view manager.

services/ui/view_manager/view_layout_request.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_layout_request.h"
+
+namespace view_manager {
+
+void RunViewLayoutCallback(mojo::ui::ViewLayoutInfo* info,
+                           bool provide_size,
+                           const ViewLayoutCallback& callback) {
+  if (info) {
+    mojo::ui::ViewLayoutInfoPtr filtered_info = info->Clone();
+    if (!provide_size)
+      filtered_info->size.reset();
+    callback.Run(filtered_info.Pass());
+  } else {
+    callback.Run(nullptr);
+  }
+}
+
+ViewLayoutRequest::ViewLayoutRequest(
+    mojo::ui::ViewLayoutParamsPtr layout_params)
+    : issued(false),
+      layout_params_(layout_params.Pass()),
+      was_dispatched_(false) {}
+
+ViewLayoutRequest::~ViewLayoutRequest() {
+  if (!was_dispatched_)
+    DispatchLayoutInfo(nullptr);
+}
+
+void ViewLayoutRequest::AddCallback(bool provide_size,
+                                    const ViewLayoutCallback& callback) {
+  DCHECK(!was_dispatched_);
+  clients_.emplace_back(
+      std::unique_ptr<Client>(new Client(provide_size, callback)));
+}
+
+void ViewLayoutRequest::DispatchLayoutInfo(mojo::ui::ViewLayoutInfo* info) {
+  DCHECK(!was_dispatched_);
+  was_dispatched_ = true;
+  for (auto it = clients_.begin(); it != clients_.end(); ++it) {
+    (*it)->DispatchLayoutInfo(info);
+  }
+}
+
+ViewLayoutRequest::Client::Client(bool provide_size,
+                                  const ViewLayoutCallback& callback)
+    : provide_size_(provide_size), callback_(callback) {}
+
+ViewLayoutRequest::Client::~Client() {}
+
+void ViewLayoutRequest::Client::DispatchLayoutInfo(
+    mojo::ui::ViewLayoutInfo* info) {
+  RunViewLayoutCallback(info, provide_size_, callback_);
+}
+
+}  // namespace view_manager