Defect 248426: Speak rendered text when no selection is made on Mac

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index 154c0cb394b79dffdb49ebec54066ddb1cfd9ce1..5f1e6cd40c813071e0331d15add51826e0944e9d 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1016,6 +1016,20 @@ void RenderViewImpl::PluginFocusChanged(bool focused, int plugin_id) {
   Send(new ViewHostMsg_PluginFocusChanged(routing_id(), focused, plugin_id));
 }
 
+void RenderViewImpl::OnGetRenderedText() {
+  if (!webview())
+    return;
+  // Get rendered text from WebLocalFrame.
+  // TODO: Currently IPC truncates any data that has a
+  // size > kMaximumMessageSize. May be split the text into smaller chunks and
+  // send back using multiple IPC. See http://crbug.com/393444.
+  static const size_t kMaximumMessageSize = 128 * 1024 * 1024;

[jamesr, 2014/07/18 06:05:04]

we won't actually be able to fit a string this big into an IPC message since
we'll need a few bytes for headers and lenth and the utf8 encoding of the string
may use >1 byte per character.  Probably safer to pick something more reasonable
here (like a few meg) that's well shy of the IPC max

[sarka, 2014/07/19 06:27:35]

I actually picked this number from ipc_channel.h.

https://code.google.com/p/chromium/codesearch#chromium/src/ipc/ipc_channel.h&...

+  std::string text = webview()->mainFrame()->contentAsText(
+      kMaximumMessageSize).utf8();
+
+  Send(new ViewMsg_GetRenderedTextCompleted(routing_id(), text));
+}
+
 void RenderViewImpl::StartPluginIme() {
   IPC::Message* msg = new ViewHostMsg_StartPluginIme(routing_id());
   // This message can be sent during event-handling, and needs to be delivered
@@ -1128,6 +1142,8 @@ bool RenderViewImpl::OnMessageReceived(const IPC::Message& message) {
                         OnUpdateTopControlsState)
     IPC_MESSAGE_HANDLER(ViewMsg_ExtractSmartClipData, OnExtractSmartClipData)
 #elif defined(OS_MACOSX)
+    IPC_MESSAGE_HANDLER(ViewMsg_GetRenderedText,
+                        OnGetRenderedText)
     IPC_MESSAGE_HANDLER(ViewMsg_PluginImeCompositionCompleted,
                         OnPluginImeCompositionCompleted)
     IPC_MESSAGE_HANDLER(ViewMsg_SelectPopupMenuItem, OnSelectPopupMenuItem)