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
13namespace chromeos {
14
15namespace {
16
17const 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.
21bool 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
33KeyboardDrivenEventRewriter::KeyboardDrivenEventRewriter() {}
34
35KeyboardDrivenEventRewriter::~KeyboardDrivenEventRewriter() {}
36
37ui::EventRewriteStatus KeyboardDrivenEventRewriter::RewriteForTesting(
38    const ui::Event& event,
39    scoped_ptr<ui::Event>* rewritten_event) {
40  return Rewrite(event, rewritten_event);
41}
42
43ui::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
52ui::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
59ui::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
90