Mozart: Add helpers for building view associates.

mojo/ui/associates/view_inspector_client.h

Index: mojo/ui/associates/view_inspector_client.h
diff --git a/mojo/ui/associates/view_inspector_client.h b/mojo/ui/associates/view_inspector_client.h
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+// 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 MOJO_UI_ASSOCIATES_VIEW_INSPECTOR_CLIENT_H_
+#define MOJO_UI_ASSOCIATES_VIEW_INSPECTOR_CLIENT_H_
+
+#include <queue>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "mojo/services/ui/views/interfaces/view_associates.mojom.h"
+#include "mojo/ui/associates/resolved_hits.h"
+
+namespace mojo {
+namespace ui {
+
+// Provides facilities for using a |ViewInspector|, including caching.
+class ViewInspectorClient : public base::RefCounted<ViewInspectorClient> {
+ public:
+  ViewInspectorClient(mojo::ui::ViewInspectorPtr view_inspector);
+
+  mojo::ui::ViewInspector* view_inspector() { return view_inspector_.get(); }
+
+  // Resolves all of the scene tokens referenced in the hit test result
+  // then invokes the callback.
+  // Note: May invoke the callback immediately if no remote calls were required.
+  void ResolveHits(mojo::gfx::composition::HitTestResultPtr hit_test_result,
+                   const ResolvedHitsCallback& callback);
+
+ private:
+  friend class base::RefCounted<ViewInspectorClient>;
+  ~ViewInspectorClient();
+
+  void ResolveSceneHit(
+      const mojo::gfx::composition::SceneHit* scene_hit,
+      ResolvedHits* resolved_hits,
+      mojo::Array<mojo::gfx::composition::SceneTokenPtr>* missing_scene_tokens);
+  void OnScenesResolved(scoped_ptr<ResolvedHits> resolved_hits,
+                        mojo::Array<uint32_t> missing_scene_token_values,
+                        const ResolvedHitsCallback& callback,
+                        mojo::Array<mojo::ui::ViewTokenPtr> view_tokens);
+
+  mojo::ui::ViewInspectorPtr view_inspector_;
+
+  // TODO(jeffbrown): Decide how this should be pruned.
+  SceneTokenValueToViewTokenMap resolved_scene_cache_;
+
+  std::queue<ResolvedHitsCallback> resolutions_;
+
+  DISALLOW_COPY_AND_ASSIGN(ViewInspectorClient);
+};
+
+}  // namespace ui
+}  // namespace mojo
+
+#endif  // MOJO_UI_ASSOCIATES_VIEW_INSPECTOR_CLIENT_H_