[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/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebPoint.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::WebPoint web_point(point);
+  uint index = webview()->mainFrame()->characterIndexForPoint(web_point);

[James Su, 2011/02/28 19:28:00]

webview()->focusedFrame() is used in render_view.cc. Is it correct to use
mainFrame() in this file?

[Robert Sesek, 2011/03/18 21:33:16]

Should be focusedFrame(). Done.

+  Send(new TextInputClientReplyMsg_GotCharacterIndexForPoint(routing_id(),
+      index));
+}
+
+void TextInputClientObserver::OnFirstRectForCharacterRange(uint location,
+                                                           uint length) {
+  WebKit::WebFrame* frame = webview()->mainFrame();
+  WebKit::WebRect web_rect;
+  frame->firstRectForCharacterRange(location, length, web_rect);

[James Su, 2011/02/28 19:44:04]

Do we need to call frame->view()->contentsToWindow(web_rect) to convert to
coordinates?

[Robert Sesek, 2011/03/18 21:33:16]

No, it returns in window coordinates.

+  gfx::Rect rect(web_rect);
+  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));
+}