A tricky fix for Issue 1845.

This change is a very tricky fix for Issue 1845 in chromium: cant alignt text to the right using right shift and right ctrl.This change consists of two parts listed below.

1. Emulating the implementation of Safari that changes the text-direction of an input element.

Safari uses context menus to change the text direction. This change adds an IPC message 'ViewMsg_SetTextDirection', which notifies the new text direction. Also, it adds two functions: RenderWidgetHost::UpdateTextDirection() and RenderWidgetHost::NotifyTextDirection(). They encapsulate the new IPC message so that we can use them both when we presses a set of keys and when we add context-menu items which change the text direction.

2. Calling the above interface when pressing right-shift and right-control keys, or when left-shift and left-control keys.

This modifies the RenderWidgetHostViewWin::OnKeyEvent() function and call the above text-direction interfaces when a user finishes pressing the keys. As you can imagine, if we send an IPC message every time when we receive a WM_KEYDOWN event, we continue sending IPC messages while a user is pressing the keys.

BUG=1845
Review URL: http://codereview.chromium.org/39252

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@11953 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 34 insertions, 0 deletions

diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index ebac85c..4d67d88 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -38,6 +38,7 @@
 #include "webkit/glue/webinputevent.h"
 #include "webkit/glue/webplugin.h"
 #include "webkit/glue/webpreferences.h"
+#include "webkit/glue/webtextdirection.h"
 #include "webkit/glue/webview_delegate.h"
 
 #if defined(OS_POSIX)
@@ -1833,6 +1834,39 @@ struct ParamTraits<AudioOutputStream::State> {
   }
 };
 
+template <>
+struct ParamTraits<WebTextDirection> {
+  typedef WebTextDirection param_type;
+  static void Write(Message* m, const param_type& p) {
+    m->WriteInt(p);
+  }
+  static bool Read(const Message* m, void** iter, param_type* p) {
+    int type;
+    if (!m->ReadInt(iter, &type))
+      return false;
+    *p = static_cast<WebTextDirection>(type);
+    return true;
+  }
+  static void Log(const param_type& p, std::wstring* l) {
+    std::wstring control;
+    switch (p) {
+     case WEB_TEXT_DIRECTION_DEFAULT:
+      control = L"WEB_TEXT_DIRECTION_DEFAULT";
+      break;
+     case WEB_TEXT_DIRECTION_RTL:
+      control = L"WEB_TEXT_DIRECTION_RTL";
+      break;
+     case WEB_TEXT_DIRECTION_LTR:
+      control = L"WEB_TEXT_DIRECTION_LTR";
+      break;
+     default:
+      control = L"UNKNOWN";
+      break;
+    }
+
+    LogParam(control, l);
+  }
+};
 
 }  // namespace IPC