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

chrome/browser/renderer_host/text_input_client_message_filter.mm

Index: chrome/browser/renderer_host/text_input_client_message_filter.mm
diff --git a/chrome/browser/renderer_host/text_input_client_message_filter.mm b/chrome/browser/renderer_host/text_input_client_message_filter.mm
new file mode 100644
index 0000000000000000000000000000000000000000..40954ef0c65245f177a87aeb31eb18d2272c57a7
--- /dev/null
+++ b/chrome/browser/renderer_host/text_input_client_message_filter.mm
@@ -0,0 +1,77 @@
+// 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/browser/renderer_host/text_input_client_message_filter.h"
+
+#include "base/string16.h"
+#include "chrome/browser/renderer_host/render_view_host.h"
+#include "chrome/browser/renderer_host/render_widget_host_view.h"
+#include "chrome/browser/renderer_host/text_input_client_mac.h"
+#include "chrome/common/text_input_client_messages.h"
+#include "ipc/ipc_message_macros.h"
+#include "ui/gfx/rect.h"
+
+TextInputClientMessageFilter::TextInputClientMessageFilter(int child_id)
+    : BrowserMessageFilter(),
+      child_process_id_(child_id) {
+}
+
+TextInputClientMessageFilter::~TextInputClientMessageFilter() {
+}
+
+bool TextInputClientMessageFilter::OnMessageReceived(
+    const IPC::Message& message,
+    bool* message_was_ok) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP_EX(TextInputClientMessageFilter, message,
+      *message_was_ok)
+    IPC_MESSAGE_HANDLER(TextInputClientReplyMsg_GotCharacterIndexForPoint,
+                        OnGotCharacterIndexForPoint)
+    IPC_MESSAGE_HANDLER(TextInputClientReplyMsg_GotFirstRectForRange,
+                        OnGotFirstRectForRange)
+    IPC_MESSAGE_HANDLER(TextInputClientReplyMsg_GotStringForRange,
+                        OnGotStringFromRange)
+    IPC_MESSAGE_HANDLER(TextInputClientViewHostMsg_ImeCompositionRangeChanged,
+                        OnImeCompositionRangeChanged)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP_EX()
+  return handled;
+}
+
+void TextInputClientMessageFilter::OnGotCharacterIndexForPoint(uint index) {
+  TextInputClientMac* service = TextInputClientMac::GetInstance();
+  service->SetCharacterIndexAndSignal(index);
+}
+
+void TextInputClientMessageFilter::OnGotFirstRectForRange(
+    const gfx::Rect& rect) {
+  CGRect cgrect(rect.ToCGRect());
+  TextInputClientMac* service = TextInputClientMac::GetInstance();
+  service->SetFirstRectAndSignal(NSRectFromCGRect(rect.ToCGRect()));
+}
+
+void TextInputClientMessageFilter::OnGotStringFromRange(
+    const string16& string) {
+  TextInputClientMac* service = TextInputClientMac::GetInstance();
+  if (!string.length()) {
+    service->SetSubstringAndSignal(nil);
+  } else {
+    NSData* data = [NSData dataWithBytes:string.data()
+                                  length:string.length()];
+    NSAttributedString* string = [NSUnarchiver unarchiveObjectWithData:data];
+    service->SetSubstringAndSignal(string);
+  }
+}
+
+void TextInputClientMessageFilter::OnImeCompositionRangeChanged(
+    const IPC::Message& msg,
+    int start,
+    int end) {
+  RenderViewHost* rvh =

[jam, 2011/02/25 18:15:28]

RenderViewHost is not threadsafe.  Your message filter's dispatcher gets called
on the IO thread, so you can't do this.

you can always implement OverrideThreadForMessage and pass in UI for the thread,
that way your function dispatcher will get called on the UI thread for that
message.

[Robert Sesek, 2011/02/25 18:47:13]

Clever. Done.

+      RenderViewHost::FromID(child_process_id_, msg.routing_id());
+  if (!rvh) {
+    return;
+  }
+  rvh->view()->ImeCompositionRangeChanged(start, end);
+}