mac: Add support for asynchronous dictionary lookup

content/browser/renderer_host/text_input_client_mac.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_RENDERER_HOST_TEXT_INPUT_CLIENT_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_TEXT_INPUT_CLIENT_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
@@ skipping 19 matching lines @@
 //
 // Because these methods are part of a synchronous system API, implementing them
 // requires getting information from the renderer synchronously. Rather than
 // using an actual sync IPC message, a normal async ViewMsg is used with a lock
 // and condition (managed by this service).
 class CONTENT_EXPORT TextInputClientMac {
  public:
   // Returns the singleton instance.
   static TextInputClientMac* GetInstance();
 
+  void GetStringAtPoint(RenderWidgetHost* rwh,
+                        gfx::Point point,
+                        void (^replyHandler)(NSAttributedString*, NSRect));
+  void GetStringAtPointReply(NSAttributedString*, NSRect);
+
   // Each of the three methods mentioned above has an associated pair of methods
   // to get data from the renderer. The Get*() methods block the calling thread
   // (always the UI thread) with a short timeout after the async message has
   // been sent to the renderer to lookup the information needed to respond to
   // the system. The Set*AndSignal() methods store the looked up information in
   // this service and signal the condition to allow the Get*() methods to
   // unlock and return that stored value.
   //
   // Returns NSNotFound if the request times out or is not completed.
   NSUInteger GetCharacterIndexAtPoint(RenderWidgetHost* rwh, gfx::Point point);
@@ skipping 25 matching lines @@
   // condition.
   void AfterRequest();
 
   NSUInteger character_index_;
   NSRect first_rect_;
   base::scoped_nsobject<NSAttributedString> substring_;
 
   base::Lock lock_;
   base::ConditionVariable condition_;
 
+  void (^replyHandler_)(NSAttributedString*, NSRect);

[Avi (use Gerrit), 2014/02/18 21:42:25]

Don't use raw pointers if possible. ScopedBlock?

+
   DISALLOW_COPY_AND_ASSIGN(TextInputClientMac);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_TEXT_INPUT_CLIENT_MAC_H_