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// Copyright 2021 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 "ui/base/ime/fuchsia/keyboard_client.h"
#include <memory>
#include "base/logging.h"
#include "base/notreached.h"
#include "ui/events/fuchsia/input_event_sink.h"
#include "ui/events/keycodes/dom/dom_code.h"
#include "ui/events/keycodes/dom/keycode_converter.h"
#include "ui/events/keycodes/keyboard_code_conversion.h"
#include "ui/events/keycodes/keyboard_code_conversion_fuchsia.h"
namespace ui {
namespace {
// Converts the state of modifiers managed by Fuchsia (e.g. Caps and Num Lock)
// into ui::Event flags.
int ModifiersToEventFlags(const fuchsia::ui::input3::Modifiers& modifiers) {
int event_flags = 0;
if ((modifiers & fuchsia::ui::input3::Modifiers::CAPS_LOCK) ==
fuchsia::ui::input3::Modifiers::CAPS_LOCK) {
event_flags |= EF_CAPS_LOCK_ON;
}
if ((modifiers & fuchsia::ui::input3::Modifiers::NUM_LOCK) ==
fuchsia::ui::input3::Modifiers::NUM_LOCK) {
event_flags |= EF_NUM_LOCK_ON;
}
if ((modifiers & fuchsia::ui::input3::Modifiers::SCROLL_LOCK) ==
fuchsia::ui::input3::Modifiers::SCROLL_LOCK) {
event_flags |= EF_SCROLL_LOCK_ON;
}
return event_flags;
}
absl::optional<EventType> ConvertKeyEventType(
fuchsia::ui::input3::KeyEventType type) {
switch (type) {
case fuchsia::ui::input3::KeyEventType::PRESSED:
return ET_KEY_PRESSED;
case fuchsia::ui::input3::KeyEventType::RELEASED:
return ET_KEY_RELEASED;
case fuchsia::ui::input3::KeyEventType::SYNC:
case fuchsia::ui::input3::KeyEventType::CANCEL:
// SYNC and CANCEL should not generate ui::Events.
return absl::nullopt;
default:
NOTREACHED() << "Unknown KeyEventType received: "
<< static_cast<int>(type);
return absl::nullopt;
}
}
// Creates an event for an event which has no |key|.
absl::optional<ui::KeyEvent> ConvertToCharacterEvent(
const fuchsia::ui::input3::KeyEvent& key_event) {
DCHECK(!key_event.has_key());
absl::optional<EventType> event_type = ConvertKeyEventType(key_event.type());
if (!event_type) {
return absl::nullopt;
}
if (event_type != ET_KEY_PRESSED) {
// Keypress phase cannot be tracked on keypresses without hardware keys,
// so only handle the "pressed" edge transition.
return absl::nullopt;
}
const uint32_t codepoint = key_event.key_meaning().codepoint();
if (codepoint > std::numeric_limits<char16_t>::max()) {
// TODO(crbug.com/1220260): Handle codepoints outside the BMP.
return absl::nullopt;
}
return ui::KeyEvent(*event_type, VKEY_UNKNOWN, DomCode::NONE,
EF_IS_SYNTHESIZED, DomKey::FromCharacter(codepoint),
base::TimeTicks::FromZxTime(key_event.timestamp()), true);
}
} // namespace
KeyboardClient::KeyboardClient(fuchsia::ui::input3::Keyboard* keyboard_service,
fuchsia::ui::views::ViewRef view_ref,
InputEventSink* event_sink)
: binding_(this), event_sink_(event_sink) {
DCHECK(event_sink_);
// Connect to the Keyboard service and register |keyboard_client_| as a
// listener.
fidl::InterfaceHandle<fuchsia::ui::input3::KeyboardListener>
keyboard_listener;
fidl::InterfaceRequest<fuchsia::ui::input3::KeyboardListener>
keyboard_listener_request = keyboard_listener.NewRequest();
keyboard_service->AddListener(std::move(view_ref),
std::move(keyboard_listener), [] {});
binding_.Bind(std::move(keyboard_listener_request));
}
KeyboardClient::~KeyboardClient() = default;
void KeyboardClient::OnKeyEvent(
fuchsia::ui::input3::KeyEvent key_event,
fuchsia::ui::input3::KeyboardListener::OnKeyEventCallback callback) {
if (!IsValid(key_event)) {
binding_.Close(ZX_ERR_INVALID_ARGS);
return;
}
if (ProcessKeyEvent(key_event)) {
callback(fuchsia::ui::input3::KeyEventStatus::HANDLED);
} else {
callback(fuchsia::ui::input3::KeyEventStatus::NOT_HANDLED);
}
}
bool KeyboardClient::IsValid(const fuchsia::ui::input3::KeyEvent& key_event) {
if (!key_event.has_type() || !key_event.has_timestamp())
return false;
if (!key_event.has_key() && !key_event.has_key_meaning())
return false;
return true;
}
bool KeyboardClient::ProcessKeyEvent(
const fuchsia::ui::input3::KeyEvent& key_event) {
const bool generate_character_event = !key_event.has_key();
absl::optional<ui::KeyEvent> converted_event;
if (generate_character_event) {
converted_event = ConvertToCharacterEvent(key_event);
} else {
UpdateCachedModifiers(key_event);
converted_event = ConvertKeystrokeEvent(key_event);
}
if (!converted_event) {
return false;
}
event_sink_->DispatchEvent(&converted_event.value());
return converted_event->handled();
}
absl::optional<ui::KeyEvent> KeyboardClient::ConvertKeystrokeEvent(
const fuchsia::ui::input3::KeyEvent& key_event) {
DCHECK(key_event.has_key());
absl::optional<EventType> event_type = ConvertKeyEventType(key_event.type());
if (!event_type) {
return absl::nullopt;
}
// Convert |key_event| to a ui::KeyEvent.
int event_flags = EventFlagsForCachedModifiers();
if (key_event.has_modifiers())
event_flags |= ModifiersToEventFlags(key_event.modifiers());
// TODO(https://crbug.com/1187257): Use input3.KeyMeaning instead of US layout
// as the default.
DomCode dom_code =
KeycodeConverter::UsbKeycodeToDomCode(static_cast<int>(key_event.key()));
DomKey dom_key;
KeyboardCode key_code;
if (!DomCodeToUsLayoutDomKey(dom_code, event_flags, &dom_key, &key_code)) {
LOG(ERROR) << "DomCodeToUsLayoutDomKey() failed for key: "
<< static_cast<uint32_t>(key_event.key());
}
return ui::KeyEvent(*event_type, key_code, dom_code, event_flags, dom_key,
base::TimeTicks::FromZxTime(key_event.timestamp()));
}
// TODO(https://crbug.com/850697): Add additional modifiers as they become
// supported.
void KeyboardClient::UpdateCachedModifiers(
const fuchsia::ui::input3::KeyEvent& key_event) {
// A SYNC event indicates that the key was pressed while the view gained input
// focus. A CANCEL event indicates the key was held when the view lost input
// focus. In both cases, the state of locally tracked modifiers should be
// updated.
bool modifier_active =
key_event.type() == fuchsia::ui::input3::KeyEventType::PRESSED ||
key_event.type() == fuchsia::ui::input3::KeyEventType::SYNC;
switch (key_event.key()) {
case fuchsia::input::Key::LEFT_SHIFT:
left_shift_ = modifier_active;
break;
case fuchsia::input::Key::RIGHT_SHIFT:
right_shift_ = modifier_active;
break;
case fuchsia::input::Key::LEFT_ALT:
left_alt_ = modifier_active;
break;
case fuchsia::input::Key::RIGHT_ALT:
right_alt_ = modifier_active;
break;
case fuchsia::input::Key::LEFT_CTRL:
left_ctrl_ = modifier_active;
break;
case fuchsia::input::Key::RIGHT_CTRL:
right_ctrl_ = modifier_active;
break;
default:
break;
}
}
int KeyboardClient::EventFlagsForCachedModifiers() {
int event_flags = 0;
if (left_shift_ || right_shift_)
event_flags |= EF_SHIFT_DOWN;
if (left_alt_ || right_alt_)
event_flags |= EF_ALT_DOWN;
if (left_ctrl_ || right_ctrl_)
event_flags |= EF_CONTROL_DOWN;
return event_flags;
}
} // namespace ui
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