chrome/browser/chromeos/events/keyboard_driven_event_rewriter.cc

   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/events/keyboard_driven_event_rewriter.h"
   6
   7 #include "chrome/browser/chromeos/events/event_rewriter.h"
   8 #include "chrome/browser/chromeos/system/input_device_settings.h"
   9 #include "components/user_manager/user_manager.h"
  10 #include "ui/events/event.h"
  11 #include "ui/events/event_utils.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 (user_manager::UserManager::IsInitialized() &&
  23       !user_manager::UserManager::Get()->IsSessionStarted()) {
  24     return system::InputDeviceSettings::Get()
  25         ->ForceKeyboardDrivenUINavigation();
  26   }
  27
  28   return false;
  29 }
  30
  31 }  // namespace
  32
  33 KeyboardDrivenEventRewriter::KeyboardDrivenEventRewriter() {}
  34
  35 KeyboardDrivenEventRewriter::~KeyboardDrivenEventRewriter() {}
  36
  37 ui::EventRewriteStatus KeyboardDrivenEventRewriter::RewriteForTesting(
  38     const ui::Event& event,
  39     scoped_ptr<ui::Event>* rewritten_event) {
  40   return Rewrite(event, rewritten_event);
  41 }
  42
  43 ui::EventRewriteStatus KeyboardDrivenEventRewriter::RewriteEvent(
  44     const ui::Event& event,
  45     scoped_ptr<ui::Event>* rewritten_event) {
  46   if (!ShouldStripModifiersForArrowKeysAndEnter())
  47     return ui::EVENT_REWRITE_CONTINUE;
  48
  49   return Rewrite(event, rewritten_event);
  50 }
  51
  52 ui::EventRewriteStatus KeyboardDrivenEventRewriter::NextDispatchEvent(
  53     const ui::Event& last_event,
  54     scoped_ptr<ui::Event>* new_event) {
  55   NOTREACHED();
  56   return ui::EVENT_REWRITE_CONTINUE;
  57 }
  58
  59 ui::EventRewriteStatus KeyboardDrivenEventRewriter::Rewrite(
  60     const ui::Event& event,
  61     scoped_ptr<ui::Event>* rewritten_event) {
  62   int flags = event.flags();
  63   if ((flags & kModifierMask) != kModifierMask)
  64     return ui::EVENT_REWRITE_CONTINUE;
  65
  66   DCHECK(event.type() == ui::ET_KEY_PRESSED ||
  67          event.type() == ui::ET_KEY_RELEASED)
  68       << "Unexpected event type " << event.type();
  69   const ui::KeyEvent& key_event = static_cast<const ui::KeyEvent&>(event);
  70   ui::KeyboardCode key_code = key_event.key_code();
  71
  72   if (key_code != ui::VKEY_LEFT &&
  73       key_code != ui::VKEY_RIGHT &&
  74       key_code != ui::VKEY_UP &&
  75       key_code != ui::VKEY_DOWN &&
  76       key_code != ui::VKEY_RETURN &&
  77       key_code != ui::VKEY_F6) {
  78     return ui::EVENT_REWRITE_CONTINUE;
  79   }
  80
  81   chromeos::EventRewriter::BuildRewrittenKeyEvent(
  82       key_event,
  83       key_event.key_code(),
  84       flags & ~(ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN | ui::EF_SHIFT_DOWN),
  85       rewritten_event);
  86   return ui::EVENT_REWRITE_REWRITTEN;
  87 }
  88
  89 }  // namespace chromeos