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

chrome/renderer/text_input_client_observer.cc

+// 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.
+
+#include "chrome/renderer/text_input_client_observer.h"
+
+#include "chrome/common/text_input_client_messages.h"
+#include "chrome/renderer/render_view.h"
+#include "ipc/ipc_message_macros.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/mac/WebTextHelper.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebRect.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebString.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
+#include "ui/gfx/rect.h"
+
+TextInputClientObserver::TextInputClientObserver(RenderView* render_view)
+    : RenderViewObserver(render_view) {
+}
+
+TextInputClientObserver::~TextInputClientObserver() {
+}
+
+bool TextInputClientObserver::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(TextInputClientObserver, message)
+    IPC_MESSAGE_HANDLER(TextInputClientMsg_CharacterIndexForPoint,
+                        OnCharacterIndexForPoint)
+    IPC_MESSAGE_HANDLER(TextInputClientMsg_FirstRectForCharacterRange,
+                        OnFirstRectForCharacterRange)
+    IPC_MESSAGE_HANDLER(TextInputClientMsg_StringForRange, OnStringForRange)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  return handled;
+}
+
+WebKit::WebView* TextInputClientObserver::webview() {
+  return render_view()->webview();
+}
+
+void TextInputClientObserver::OnCharacterIndexForPoint(gfx::Point point) {
+  WebKit::WebTextHelper helper(webview()->mainFrame());
+  uint index = helper.characterIndexForPoint(point.x(), point.y());
+  Send(new TextInputClientReplyMsg_GotCharacterIndexForPoint(routing_id(),
+      index));
+}
+
+void TextInputClientObserver::OnFirstRectForCharacterRange(uint location,
+                                                           uint length) {
+  WebKit::WebTextHelper helper(webview()->mainFrame());
+  gfx::Rect rect(helper.firstRectForRange(location, length));
+  Send(new TextInputClientReplyMsg_GotFirstRectForRange(routing_id(), rect));
+}
+
+void TextInputClientObserver::OnStringForRange(uint location, uint length) {
+  WebKit::WebTextHelper helper(webview()->mainFrame());
+  WebKit::WebString webstring(helper.substringInRange(location, length));
+  Send(new TextInputClientReplyMsg_GotStringForRange(routing_id(), webstring));
+}