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

chrome/browser/renderer_host/text_input_client_message_filter.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.
+
+#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 "content/browser/browser_thread.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() {
+}
+
+void TextInputClientMessageFilter::OverrideThreadForMessage(
+    const IPC::Message& msg,
+    BrowserThread::ID* thread) {
+  if (msg.type() == TextInputClientViewHostMsg_ImeCompositionRangeChanged::ID)
+    *thread = BrowserThread::UI;
+}
+
+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) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));

[jam, 2011/02/25 19:15:15]

please don't add these dchecks, they don't add much value.  we know that by
definition, filter functions are called on the IO thread unless a message's
thread is overriden.  adding dchecks here is like testing BrowserMessageFilter,
but the place to do that is not in derived classes.

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

Removed all the DCHECKs.

+  TextInputClientMac* service = TextInputClientMac::GetInstance();
+  service->SetCharacterIndexAndSignal(index);
+}
+
+void TextInputClientMessageFilter::OnGotFirstRectForRange(
+    const gfx::Rect& rect) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  CGRect cgrect(rect.ToCGRect());
+  TextInputClientMac* service = TextInputClientMac::GetInstance();
+  service->SetFirstRectAndSignal(NSRectFromCGRect(rect.ToCGRect()));
+}
+
+void TextInputClientMessageFilter::OnGotStringFromRange(
+    const string16& string) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  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) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  RenderViewHost* rvh =
+      RenderViewHost::FromID(child_process_id_, msg.routing_id());
+  if (!rvh) {
+    return;
+  }
+  rvh->view()->ImeCompositionRangeChanged(start, end);
+}