1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
// Copyright 2015 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 "components/exo/keyboard.h"
#include "components/exo/keyboard_delegate.h"
#include "components/exo/shell_surface.h"
#include "components/exo/surface.h"
#include "ui/aura/client/focus_client.h"
#include "ui/aura/window.h"
#include "ui/base/ime/input_method.h"
#include "ui/events/base_event_utils.h"
#include "ui/events/event.h"
#include "ui/views/widget/widget.h"
namespace exo {
bool ConsumedByIme(Surface* focus, const ui::KeyEvent* event) {
// Check if IME consumed the event, to avoid it to be doubly processed.
// First let us see whether IME is active and is in text input mode.
views::Widget* widget =
focus ? views::Widget::GetTopLevelWidgetForNativeView(focus->window())
: nullptr;
ui::InputMethod* ime = widget ? widget->GetInputMethod() : nullptr;
if (!ime || ime->GetTextInputType() == ui::TEXT_INPUT_TYPE_NONE)
return false;
// Case 1:
// When IME ate a key event but did not emit character insertion event yet
// (e.g., when it is still showing a candidate list UI to the user,) the
// consumed key event is re-sent after masked |key_code| by VKEY_PROCESSKEY.
if (event->key_code() == ui::VKEY_PROCESSKEY)
return true;
// Case 2:
// When IME ate a key event and generated a single character input, it leaves
// the key event as-is, and in addition calls the active ui::TextInputClient's
// InsertChar() method. (In our case, arc::ArcImeService::InsertChar()).
//
// In Chrome OS (and Web) convention, the two calls wont't cause duplicates,
// because key-down events do not mean any character inputs there.
// (InsertChar issues a DOM "keypress" event, which is distinct from keydown.)
// Unfortunately, this is not necessary the case for our clients that may
// treat a key event as a trigger of text inputs. We need suppression.
// Same condition as components/arc/ime/arc_ime_service.cc#InsertChar.
const base::char16 ch = event->GetCharacter();
const bool is_control_char =
(0x00 <= ch && ch <= 0x1f) || (0x7f <= ch && ch <= 0x9f);
if (!is_control_char && !ui::IsSystemKeyModifier(event->flags()))
return true;
// Case 3:
// Workaround for apps that doesn't handle hardware keyboard events well.
// Keys typically on software keyboard and lack of them are fatal, namely,
// unmodified enter and backspace keys, are sent through IME.
constexpr int kModifierMask = ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN |
ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN |
ui::EF_ALTGR_DOWN | ui::EF_MOD3_DOWN;
// Same condition as components/arc/ime/arc_ime_service.cc#InsertChar.
if ((event->flags() & kModifierMask) == 0) {
if (event->key_code() == ui::VKEY_RETURN ||
event->key_code() == ui::VKEY_BACK) {
return true;
}
}
return false;
}
////////////////////////////////////////////////////////////////////////////////
// Keyboard, public:
Keyboard::Keyboard(KeyboardDelegate* delegate) : delegate_(delegate) {
auto* helper = WMHelper::GetInstance();
helper->AddPostTargetHandler(this);
helper->AddFocusObserver(this);
OnWindowFocused(helper->GetFocusedWindow(), nullptr);
}
Keyboard::~Keyboard() {
delegate_->OnKeyboardDestroying(this);
if (focus_)
focus_->RemoveSurfaceObserver(this);
auto* helper = WMHelper::GetInstance();
helper->RemoveFocusObserver(this);
helper->RemovePostTargetHandler(this);
}
////////////////////////////////////////////////////////////////////////////////
// ui::EventHandler overrides:
void Keyboard::OnKeyEvent(ui::KeyEvent* event) {
// These modifiers reflect what Wayland is aware of. For example,
// EF_SCROLL_LOCK_ON is missing because Wayland doesn't support scroll lock.
const int kModifierMask = ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN |
ui::EF_ALT_DOWN | ui::EF_COMMAND_DOWN |
ui::EF_ALTGR_DOWN | ui::EF_MOD3_DOWN |
ui::EF_NUM_LOCK_ON | ui::EF_CAPS_LOCK_ON;
int modifier_flags = event->flags() & kModifierMask;
if (modifier_flags != modifier_flags_) {
modifier_flags_ = modifier_flags;
if (focus_)
delegate_->OnKeyboardModifiers(modifier_flags_);
}
// When IME ate a key event, we use the event only for tracking key states and
// ignore for further processing. Otherwise it is handled in two places (IME
// and client) and causes undesired behavior.
bool consumed_by_ime = ConsumedByIme(focus_, event);
switch (event->type()) {
case ui::ET_KEY_PRESSED: {
auto it =
std::find(pressed_keys_.begin(), pressed_keys_.end(), event->code());
if (it == pressed_keys_.end()) {
if (focus_ && !consumed_by_ime)
delegate_->OnKeyboardKey(event->time_stamp(), event->code(), true);
pressed_keys_.push_back(event->code());
}
} break;
case ui::ET_KEY_RELEASED: {
auto it =
std::find(pressed_keys_.begin(), pressed_keys_.end(), event->code());
if (it != pressed_keys_.end()) {
if (focus_ && !consumed_by_ime)
delegate_->OnKeyboardKey(event->time_stamp(), event->code(), false);
pressed_keys_.erase(it);
}
} break;
default:
NOTREACHED();
break;
}
}
////////////////////////////////////////////////////////////////////////////////
// aura::client::FocusChangeObserver overrides:
void Keyboard::OnWindowFocused(aura::Window* gained_focus,
aura::Window* lost_focus) {
Surface* gained_focus_surface =
gained_focus ? GetEffectiveFocus(gained_focus) : nullptr;
if (gained_focus_surface != focus_) {
if (focus_) {
delegate_->OnKeyboardLeave(focus_);
focus_->RemoveSurfaceObserver(this);
focus_ = nullptr;
}
if (gained_focus_surface) {
delegate_->OnKeyboardModifiers(modifier_flags_);
delegate_->OnKeyboardEnter(gained_focus_surface, pressed_keys_);
focus_ = gained_focus_surface;
focus_->AddSurfaceObserver(this);
}
}
}
////////////////////////////////////////////////////////////////////////////////
// SurfaceObserver overrides:
void Keyboard::OnSurfaceDestroying(Surface* surface) {
DCHECK(surface == focus_);
focus_ = nullptr;
surface->RemoveSurfaceObserver(this);
}
////////////////////////////////////////////////////////////////////////////////
// Keyboard, private:
Surface* Keyboard::GetEffectiveFocus(aura::Window* window) const {
// Use window surface as effective focus.
Surface* focus = Surface::AsSurface(window);
if (!focus) {
// Fallback to main surface.
aura::Window* top_level_window = window->GetToplevelWindow();
if (top_level_window)
focus = ShellSurface::GetMainSurface(top_level_window);
}
return focus && delegate_->CanAcceptKeyboardEventsForSurface(focus) ? focus
: nullptr;
}
} // namespace exo
|
