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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/chromeos/keyboard_driven_event_rewriter.h"
      6 
      7 #include <X11/Xlib.h>
      8 
      9 #include "chrome/browser/chromeos/login/user_manager.h"
     10 #include "chrome/browser/chromeos/system/input_device_settings.h"
     11 #include "ui/events/event.h"
     12 
     13 namespace chromeos {
     14 
     15 namespace {
     16 
     17 const int kModifierMask = ui::EF_SHIFT_DOWN;
     18 
     19 // Returns true if and only if it is on login screen (i.e. user is not logged
     20 // in) and the keyboard driven flag in the OEM manifest is on.
     21 bool ShouldStripModifiersForArrowKeysAndEnter() {
     22   if (UserManager::IsInitialized() &&
     23       !UserManager::Get()->IsUserLoggedIn()) {
     24     return system::keyboard_settings::ForceKeyboardDrivenUINavigation();
     25   }
     26 
     27   return false;
     28 }
     29 
     30 }  // namespace
     31 
     32 KeyboardDrivenEventRewriter::KeyboardDrivenEventRewriter() {}
     33 
     34 KeyboardDrivenEventRewriter::~KeyboardDrivenEventRewriter() {}
     35 
     36 bool KeyboardDrivenEventRewriter::RewriteIfKeyboardDrivenOnLoginScreen(
     37     ui::KeyEvent* event) {
     38   if (!ShouldStripModifiersForArrowKeysAndEnter())
     39     return false;
     40 
     41   return RewriteEvent(event);
     42 }
     43 
     44 bool KeyboardDrivenEventRewriter::RewriteForTesting(ui::KeyEvent* event) {
     45   return RewriteEvent(event);
     46 }
     47 
     48 bool KeyboardDrivenEventRewriter::RewriteEvent(ui::KeyEvent* event) {
     49   if ((event->flags() & kModifierMask) != kModifierMask)
     50     return false;
     51 
     52   if (event->key_code() != ui::VKEY_LEFT &&
     53       event->key_code() != ui::VKEY_RIGHT &&
     54       event->key_code() != ui::VKEY_UP &&
     55       event->key_code() != ui::VKEY_DOWN &&
     56       event->key_code() != ui::VKEY_RETURN &&
     57       event->key_code() != ui::VKEY_F6) {
     58     return false;
     59   }
     60 
     61   XEvent* xev = event->native_event();
     62   XKeyEvent* xkey = &(xev->xkey);
     63   xkey->state &= ~(ControlMask | Mod1Mask | ShiftMask);
     64   event->set_flags(event->flags() & ~kModifierMask);
     65   event->NormalizeFlags();
     66   return true;
     67 }
     68 
     69 }  // namespace chromeos
     70