mandoline: Add find in page.

components/web_view/find_controller.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 COMPONENTS_WEB_VIEW_FIND_CONTROLLER_H_
+#define COMPONENTS_WEB_VIEW_FIND_CONTROLLER_H_
+
+#include <deque>
+
+#include "base/basictypes.h"
+#include "base/memory/weak_ptr.h"
+#include "components/web_view/public/interfaces/web_view.mojom.h"
+
+namespace web_view {
+
+class FindControllerDelegate;
+class Frame;
+
+// Contains all the find code used by WebViewImpl.
+class FindController {
+ public:
+  FindController(FindControllerDelegate* delegate);
+  ~FindController();
+
+  // Starts a find session looking for |search_text|. This method will first
+  // scan through frames one by one to look for the first instance of
+  // |search_text|, and return the data through
+  // OnFindInPageSelectionUpdated(). If found, it will highlight all instances
+  // of the text and report the final total count through
+  // FindInPageMatchCountUpdated().
+  void Find(int32_t request_id, const mojo::String& search_text);
+
+  // Unhighlights all find instances on the page.
+  void StopFinding();
+
+  void OnFindInFrameCountUpdated(int32_t request_id,
+                                 Frame* frame,
+                                 int32_t count,
+                                 bool final_update);
+  void OnFindInPageSelectionUpdated(int32_t request_id,
+                                    Frame* frame,
+                                    int32_t active_match_ordinal);
+
+  void DidDestroyFrame(Frame* frame);
+
+ private:
+  struct MatchData {
+    int count;
+    bool final_update;
+  };
+
+  // Callback method invoked by Find().
+  void OnContinueFinding(int32_t request_id,
+                         const mojo::String& search_text,
+                         bool found);
+
+  // Our owner.
+  FindControllerDelegate* delegate_;
+
+  // A list of Frames which we have not sent a Find() command to. Initialized
+  // in Find(), and read from OnContinueFinding().
+  std::deque<Frame*> pending_find_frames_;
+
+  // Current find session number. We keep track of this to prevent recording
+  // stale callbacks.
+  int current_find_request_;
+
+  // The current callback data from various frames.
+  std::map<Frame*, MatchData> returned_find_data_;
+
+  base::WeakPtrFactory<FindController> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(FindController);
+};
+
+}  // namespace web_view
+
+#endif  // COMPONENTS_WEB_VIEW_FIND_CONTROLLER_H_