mac: Add support for asynchronous dictionary lookup

content/browser/renderer_host/text_input_client_mac.mm

 // 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.
 
 #import "content/browser/renderer_host/text_input_client_mac.h"
 
 #include "base/memory/singleton.h"
 #include "base/metrics/histogram.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/common/text_input_client_messages.h"
 
 namespace content {
 
 // The amount of time in milliseconds that the browser process will wait for a
 // response from the renderer.
 // TODO(rsesek): Using the histogram data, find the best upper-bound for this
 // value.
 const float kWaitTimeout = 1500;
 
 TextInputClientMac::TextInputClientMac()
     : character_index_(NSNotFound),
       lock_(),
-      condition_(&lock_) {
+      condition_(&lock_),
+      replyHandler_(nil) {
 }
 
 TextInputClientMac::~TextInputClientMac() {
 }
 
 // static
 TextInputClientMac* TextInputClientMac::GetInstance() {
   return Singleton<TextInputClientMac>::get();
 }
 
+void TextInputClientMac::GetStringAtPoint(RenderWidgetHost* rwh,
+    gfx::Point point,
+    void (^replyHandler)(NSAttributedString*, NSRect)) {
+  RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(rwh);
+  rwhi->Send(new TextInputClientMsg_StringAtPoint(rwhi->GetRoutingID(),
+                                                  point));
+  if (replyHandler_ != nil)
+    [replyHandler_ release];
+  replyHandler_ = [replyHandler copy];
+}
+
+void TextInputClientMac::GetStringAtPointReply(NSAttributedString* string,
+    NSRect rect) {
+  if (replyHandler_ != nil) {
+    replyHandler_(string, rect);
+    [replyHandler_ release];
+    replyHandler_ = nil;
+  }
+}
+
 NSUInteger TextInputClientMac::GetCharacterIndexAtPoint(RenderWidgetHost* rwh,
     gfx::Point point) {
   base::TimeTicks start = base::TimeTicks::Now();
 
   BeforeRequest();
   RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(rwh);
   rwhi->Send(new TextInputClientMsg_CharacterIndexForPoint(rwhi->GetRoutingID(),
                                                           point));
   // http://crbug.com/121917
   base::ThreadRestrictions::ScopedAllowWait allow_wait;
@@ skipping 85 matching lines @@
   character_index_ = NSNotFound;
   first_rect_ = NSZeroRect;
   substring_.reset();
 }
 
 void TextInputClientMac::AfterRequest() {
   lock_.Release();
 }
 
 }  // namespace content