[Mac] Implement the system dictionary popup by implementing NSTextInput methods.

chrome/browser/renderer_host/text_input_client_mac.mm

+// Copyright (c) 2011 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 "chrome/browser/renderer_host/text_input_client_mac.h"
+
+#include "base/memory/singleton.h"
+#include "base/metrics/histogram.h"
+#include "base/time.h"
+#include "chrome/common/text_input_client_messages.h"
+#include "content/browser/renderer_host/render_widget_host.h"
+
+// 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_) {
+}
+
+TextInputClientMac::~TextInputClientMac() {
+}
+
+// static
+TextInputClientMac* TextInputClientMac::GetInstance() {
+  return Singleton<TextInputClientMac>::get();
+}
+
+NSUInteger TextInputClientMac::GetCharacterIndexAtPoint(RenderWidgetHost* rwh,
+    gfx::Point point) {
+  base::TimeTicks start = base::TimeTicks::Now();
+
+  BeforeRequest();
+  rwh->Send(new TextInputClientMsg_CharacterIndexForPoint(rwh->routing_id(),
+      point));
+  condition_.TimedWait(base::TimeDelta::FromMilliseconds(kWaitTimeout));
+  AfterRequest();
+
+  base::TimeDelta delta(base::TimeTicks::Now() - start);
+  UMA_HISTOGRAM_TIMES("TextInputClient.CharacterIndex",
+                      delta * base::Time::kMicrosecondsPerMillisecond);
+
+  return character_index_;
+}
+
+NSRect TextInputClientMac::GetFirstRectForRange(RenderWidgetHost* rwh,
+    NSRange range) {
+  base::TimeTicks start = base::TimeTicks::Now();
+
+  BeforeRequest();
+  rwh->Send(new TextInputClientMsg_FirstRectForCharacterRange(rwh->routing_id(),
+      ui::Range(range)));
+  condition_.TimedWait(base::TimeDelta::FromMilliseconds(kWaitTimeout));
+  AfterRequest();
+
+  base::TimeDelta delta(base::TimeTicks::Now() - start);
+  UMA_HISTOGRAM_TIMES("TextInputClient.FirstRect",
+                      delta * base::Time::kMicrosecondsPerMillisecond);
+
+  return first_rect_;
+}
+
+NSAttributedString* TextInputClientMac::GetAttributedSubstringFromRange(
+    RenderWidgetHost* rwh,
+    NSRange range) {
+  base::TimeTicks start = base::TimeTicks::Now();
+
+  BeforeRequest();
+  rwh->Send(new TextInputClientMsg_StringForRange(rwh->routing_id(),
+      ui::Range(range)));
+  condition_.TimedWait(base::TimeDelta::FromMilliseconds(kWaitTimeout));
+  AfterRequest();
+
+  base::TimeDelta delta(base::TimeTicks::Now() - start);
+  UMA_HISTOGRAM_TIMES("TextInputClient.Substring",
+                      delta * base::Time::kMicrosecondsPerMillisecond);
+
+  return substring_.get();
+}
+
+void TextInputClientMac::SetCharacterIndexAndSignal(NSUInteger index) {
+  lock_.Acquire();
+  character_index_ = index;
+  lock_.Release();
+  condition_.Signal();
+}
+
+void TextInputClientMac::SetFirstRectAndSignal(NSRect first_rect) {
+  lock_.Acquire();
+  first_rect_ = first_rect;
+  lock_.Release();
+  condition_.Signal();
+}
+
+void TextInputClientMac::SetSubstringAndSignal(NSAttributedString* string) {
+  lock_.Acquire();
+  substring_.reset([string copy]);
+  lock_.Release();
+  condition_.Signal();
+}
+
+void TextInputClientMac::BeforeRequest() {
+  base::TimeTicks start = base::TimeTicks::Now();
+
+  lock_.Acquire();
+
+  base::TimeDelta delta(base::TimeTicks::Now() - start);
+  UMA_HISTOGRAM_TIMES("TextInputClient.LockWait",
+                      delta * base::Time::kMicrosecondsPerMillisecond);
+
+  character_index_ = NSNotFound;
+  first_rect_ = NSZeroRect;
+  substring_.reset();
+}
+
+void TextInputClientMac::AfterRequest() {
+  lock_.Release();
+}