aura-x11: Add support for xmodmap'ed pointer buttons.

ui/base/x/x11_util.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.
 
 // This file defines utility functions for X11 (Linux only). This code has been
 // ported from XCB since we can't use XCB on Ubuntu while its 32-bit support
 // remains woefully incomplete.
 
 #include "ui/base/x/x11_util.h"
 
 #include <sys/ipc.h>
 #include <sys/shm.h>
 
 #include <list>
 #include <map>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
+#include "base/memory/singleton.h"
 #include "base/message_loop.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/threading/thread.h"
 #include "ui/base/x/x11_util_internal.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 #if defined(TOOLKIT_USES_GTK)
@@ skipping 100 matching lines @@
     cache_.clear();
   }
 
  private:
   // Maps X11 font cursor shapes to Cursor IDs.
   std::map<int, Cursor> cache_;
 
   DISALLOW_COPY_AND_ASSIGN(XCursorCache);
 };
 
+// A singleton object that remembers remappings of mouse buttons.
+class XButtonMap {
+ public:
+  static XButtonMap* GetInstance() {
+    return Singleton<XButtonMap>::get();
+  }
+
+  void UpdateMapping() {
+    count_ = XGetPointerMapping(ui::GetXDisplay(), map_, arraysize(map_));
+  }
+
+  int GetMappedButton(int button) {
+    return button > 0 && button <= count_ ? map_[button - 1] : button;
+  }
+
+ private:
+  friend struct DefaultSingletonTraits<XButtonMap>;
+
+  XButtonMap() {
+    UpdateMapping();
+  }
+
+  ~XButtonMap() {}
+
+  unsigned char map_[256];
+  int count_;
+
+  DISALLOW_COPY_AND_ASSIGN(XButtonMap);
+};
+
 }  // namespace
 
 bool XDisplayExists() {
   return (GetXDisplay() != NULL);
 }
 
 Display* GetXDisplay() {
   return base::MessagePumpForUI::GetDefaultXDisplay();
 }
 
@@ skipping 675 matching lines @@
   return monitor_rect.x == window_rect.x() &&
          monitor_rect.y == window_rect.y() &&
          monitor_rect.width == window_rect.width() &&
          monitor_rect.height == window_rect.height();
 #else
   NOTIMPLEMENTED();
   return false;
 #endif
 }
 
+int GetMappedButton(int button) {
+  return XButtonMap::GetInstance()->GetMappedButton(button);
+}
+
+void UpdateButtonMap() {
+  XButtonMap::GetInstance()->UpdateMapping();
+}
+
 // ----------------------------------------------------------------------------
 // These functions are declared in x11_util_internal.h because they require
 // XLib.h to be included, and it conflicts with many other headers.
 XRenderPictFormat* GetRenderARGB32Format(Display* dpy) {
   static XRenderPictFormat* pictformat = NULL;
   if (pictformat)
     return pictformat;
 
   // First look for a 32-bit format which ignores the alpha value
   XRenderPictFormat templ;
@@ skipping 110 matching lines @@
       << "request_code " << static_cast<int>(error_event.request_code) << ", "
       << "minor_code " << static_cast<int>(error_event.minor_code)
       << " (" << request_str << ")";
 }
 
 // ----------------------------------------------------------------------------
 // End of x11_util_internal.h
 
 
 }  // namespace ui