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/*
* Copyright 2026 Joel Klinghed
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "xcb_xkb.hh"
#include <cstdint>
#include <memory>
#include <string>
#include <xcb/xcb.h>
#include <xcb/xcb_event.h>
#define explicit dont_use_cxx_explicit
#include <xcb/xkb.h>
#undef explicit
#include <utility>
#include <xcb/xproto.h>
#include <xkbcommon/xkbcommon-x11.h>
#include <xkbcommon/xkbcommon.h>
namespace xcb {
namespace {
struct KeymapDeleter {
void operator()(xkb_keymap* keymap) const {
if (keymap)
xkb_keymap_unref(keymap);
}
};
struct StateDeleter {
void operator()(xkb_state* state) const {
if (state)
xkb_state_unref(state);
}
};
struct ContextDeleter {
void operator()(xkb_context* context) const {
if (context)
xkb_context_unref(context);
}
};
class KeyboardImpl : public Keyboard {
public:
KeyboardImpl() = default;
bool init(xcb_connection_t* conn) {
if (!xkb_x11_setup_xkb_extension(
conn, XKB_X11_MIN_MAJOR_XKB_VERSION, XKB_X11_MIN_MINOR_XKB_VERSION,
XKB_X11_SETUP_XKB_EXTENSION_NO_FLAGS, nullptr, nullptr,
&first_xkb_event_, nullptr))
return false;
ctx_.reset(xkb_context_new(XKB_CONTEXT_NO_FLAGS));
if (!ctx_)
return false;
device_id_ = xkb_x11_get_core_keyboard_device_id(conn);
if (device_id_ == -1)
return false;
if (!update_keymap(conn))
return false;
select_events(conn);
return true;
}
bool handle_event(xcb_connection_t* conn,
xcb_generic_event_t* event) override {
if (XCB_EVENT_RESPONSE_TYPE(event) == first_xkb_event_) {
auto* xkb_event = reinterpret_cast<xkb_generic_event_t*>(event);
if (std::cmp_equal(xkb_event->deviceID, device_id_)) {
switch (xkb_event->xkbType) {
case XCB_XKB_NEW_KEYBOARD_NOTIFY: {
auto* e =
reinterpret_cast<xcb_xkb_new_keyboard_notify_event_t*>(event);
if (e->changed & XCB_XKB_NKN_DETAIL_KEYCODES)
update_keymap(conn);
break;
}
case XCB_XKB_MAP_NOTIFY:
update_keymap(conn);
break;
case XCB_XKB_STATE_NOTIFY: {
auto* e = reinterpret_cast<xcb_xkb_state_notify_event_t*>(event);
xkb_state_update_mask(state_.get(), e->baseMods, e->latchedMods,
e->lockedMods, e->baseGroup, e->latchedGroup,
e->lockedGroup);
break;
}
default:
break;
}
}
return true;
}
return false;
}
std::string get_utf8(xcb_key_press_event_t* event) override {
char tmp[16];
xkb_state_key_get_utf8(state_.get(), event->detail, tmp, sizeof(tmp));
return {tmp};
}
private:
struct xkb_generic_event_t {
uint8_t response_type;
uint8_t xkbType;
uint16_t sequence;
xcb_timestamp_t time;
uint8_t deviceID;
};
bool update_keymap(xcb_connection_t* conn) {
auto* keymap = xkb_x11_keymap_new_from_device(ctx_.get(), conn, device_id_,
XKB_KEYMAP_COMPILE_NO_FLAGS);
if (!keymap)
return false;
auto* state = xkb_x11_state_new_from_device(keymap, conn, device_id_);
if (!state) {
xkb_keymap_unref(keymap);
return false;
}
keymap_.reset(keymap);
state_.reset(state);
return true;
}
void select_events(xcb_connection_t* conn) const {
static const uint16_t new_keyboard_details = XCB_XKB_NKN_DETAIL_KEYCODES;
static const uint16_t map_parts =
XCB_XKB_MAP_PART_KEY_TYPES | XCB_XKB_MAP_PART_KEY_SYMS |
XCB_XKB_MAP_PART_MODIFIER_MAP | XCB_XKB_MAP_PART_EXPLICIT_COMPONENTS |
XCB_XKB_MAP_PART_KEY_ACTIONS | XCB_XKB_MAP_PART_VIRTUAL_MODS |
XCB_XKB_MAP_PART_VIRTUAL_MOD_MAP;
static const uint16_t state_details =
XCB_XKB_STATE_PART_MODIFIER_BASE | XCB_XKB_STATE_PART_MODIFIER_LATCH |
XCB_XKB_STATE_PART_MODIFIER_LOCK | XCB_XKB_STATE_PART_GROUP_BASE |
XCB_XKB_STATE_PART_GROUP_LATCH | XCB_XKB_STATE_PART_GROUP_LOCK;
xcb_xkb_select_events_details_t details = {};
details.affectNewKeyboard = new_keyboard_details;
details.newKeyboardDetails = new_keyboard_details;
details.affectState = state_details;
details.stateDetails = state_details;
xcb_xkb_select_events_aux(conn, device_id_,
XCB_XKB_EVENT_TYPE_NEW_KEYBOARD_NOTIFY |
XCB_XKB_EVENT_TYPE_MAP_NOTIFY |
XCB_XKB_EVENT_TYPE_STATE_NOTIFY,
0, 0, map_parts, map_parts, &details);
}
std::unique_ptr<xkb_context, ContextDeleter> ctx_;
std::unique_ptr<xkb_keymap, KeymapDeleter> keymap_;
std::unique_ptr<xkb_state, StateDeleter> state_;
uint8_t first_xkb_event_;
int32_t device_id_;
};
} // namespace
std::unique_ptr<Keyboard> Keyboard::create(xcb_connection_t* conn) {
auto ret = std::make_unique<KeyboardImpl>();
if (ret->init(conn))
return ret;
return nullptr;
}
} // namespace xcb
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