aura: Make keyevents for renderers work correctly in X11.

content/browser/renderer_host/web_input_event_aura.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 "content/browser/renderer_host/web_input_event_aura.h"
 
 #include "ui/aura/event.h"
 
 namespace content {
 
 WebKit::WebMouseEvent MakeUntranslatedWebMouseEventFromNativeEvent(
     base::NativeEvent native_event);
+WebKit::WebMouseEvent MakeWebMouseEventFromAuraEvent(aura::MouseEvent* event);
 WebKit::WebKeyboardEvent MakeWebKeyboardEventFromNativeEvent(
     base::NativeEvent native_event);
 
 // General approach:
 //
 // aura::Event only carries a subset of possible event data provided to Aura by
 // the host platform. WebKit utilizes a larger subset of that information than
 // Aura itself. WebKit includes some built in cracking functionality that we
 // rely on to obtain this information cleanly and consistently.
 //
 // The only place where an aura::Event's data differs from what the underlying
 // base::NativeEvent would provide is position data, since we would like to
 // provide coordinates relative to the aura::Window that is hosting the
 // renderer, not the top level platform window.
 //
 // The approach is to fully construct a WebKit::WebInputEvent from the
 // aura::Event's base::NativeEvent, and then replace the coordinate fields with
 // the translated values from the aura::Event.
 //
+// The exception is mouse events on linux. The aura::MouseEvent contains enough
+// necessary information to construct a WebMouseEvent. So instead of extracting
+// the information from the XEvent, which can be tricky when supporting both
+// XInput2 and XInput, the WebMouseEvent is constructed from the
+// aura::MouseEvent. This will not be necessary once only XInput2 is supported.
+//
 
 WebKit::WebMouseEvent MakeWebMouseEvent(aura::MouseEvent* event) {
+#if defined(OS_WIN)
   // Construct an untranslated event from the platform event data.
   WebKit::WebMouseEvent webkit_event =
       MakeUntranslatedWebMouseEventFromNativeEvent(event->native_event());
+#else
+  WebKit::WebMouseEvent webkit_event = MakeWebMouseEventFromAuraEvent(event);
+#endif
 
   // Replace the event's coordinate fields with translated position data from
   // |event|.
   webkit_event.windowX = webkit_event.x = event->x();
   webkit_event.windowY = webkit_event.y = event->y();
 
   // TODO(beng): map these to screen coordinates.
   webkit_event.globalX = event->x();
   webkit_event.globalY = event->y();
 
   return webkit_event;
 }
 
 WebKit::WebKeyboardEvent MakeWebKeyboardEvent(aura::KeyEvent* event) {
   // Key events require no translation by the aura system.
   return MakeWebKeyboardEventFromNativeEvent(event->native_event());
 }
 
 }  // namespace content