初始化 xkb 扩展
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207
src/xkb.c
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207
src/xkb.c
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#include "xkb.h"
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#include <assert.h>
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#include <glib.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include <xcb/xcb.h>
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#include <xcb/xcb_keysyms.h>
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#include <xcb/xkb.h>
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#include <xcb/xproto.h>
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#include <xkbcommon/xkbcommon-x11.h>
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#include <xkbcommon/xkbcommon.h>
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#include "atoms-extern.h"
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#include "default_config.h"
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#include "utils.h"
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#include "wm.h"
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#include "xwindow.h"
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static bool xkb_fill_rule_names_from_root(struct xkb_rule_names *xkb_names) {
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xcb_get_property_cookie_t cookie = xcb_get_property_unchecked(
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wm.xcb_conn, false, wm.screen->root, _XKB_RULES_NAMES,
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XCB_GET_PROPERTY_TYPE_ANY, 0, UINT_MAX);
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xcb_get_property_reply_t *reply =
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xcb_get_property_reply(wm.xcb_conn, cookie, nullptr);
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if (!reply) return false;
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if (reply->value_len == 0) {
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p_delete(&reply);
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return false;
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}
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const char *walk = xcb_get_property_value(reply);
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size_t remaining = xcb_get_property_value_length(reply);
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for (int i = 0; i < 5 && remaining > 0; i++) {
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size_t len = strnlen(walk, remaining);
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switch (i) {
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case 0:
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xkb_names->rules = strndup(walk, len);
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break;
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case 1:
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xkb_names->model = strndup(walk, len);
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break;
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case 2:
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xkb_names->layout = strndup(walk, len);
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break;
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case 3:
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xkb_names->variant = strndup(walk, len);
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break;
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case 4:
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xkb_names->options = strndup(walk, len);
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break;
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}
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remaining -= len + 1;
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walk = &walk[len + 1];
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}
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p_delete(&reply);
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return true;
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}
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static void xkb_fill_state(void) {
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int32_t device_id = -1;
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if (wm.have_xkb) {
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device_id = xkb_x11_get_core_keyboard_device_id(wm.xcb_conn);
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if (device_id == -1) warn("Failed get XKB device id");
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}
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if (device_id == -1) {
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struct xkb_rule_names names = {nullptr, nullptr, nullptr, nullptr, nullptr};
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if (!xkb_fill_rule_names_from_root(&names)) {
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warn(
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"Could not get _XKB_RULES_NAMES from root window, falling back to "
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"defaults.");
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}
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struct xkb_keymap *xkb_keymap = xkb_keymap_new_from_names(
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wm.xkb_ctx, &names, XKB_KEYMAP_COMPILE_NO_FLAGS);
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wm.xkb_state = xkb_state_new(xkb_keymap);
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if (!wm.xkb_state) fatal("Failed create XKB state");
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xkb_keymap_unref(xkb_keymap);
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p_delete(&names.rules);
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p_delete(&names.model);
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p_delete(&names.layout);
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p_delete(&names.variant);
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p_delete(&names.options);
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} else {
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struct xkb_keymap *xkb_keymap = xkb_x11_keymap_new_from_device(
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wm.xkb_ctx, wm.xcb_conn, device_id, XKB_KEYMAP_COMPILE_NO_FLAGS);
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if (!xkb_keymap) fatal("Failed get XKB keymap from device");
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wm.xkb_state =
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xkb_x11_state_new_from_device(xkb_keymap, wm.xcb_conn, device_id);
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if (!wm.xkb_state) fatal("Failed get XKB state from device");
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xkb_keymap_unref(xkb_keymap);
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}
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}
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static void xkb_init_keymap(void) {
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wm.xkb_ctx = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
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if (!wm.xkb_ctx) fatal("Cannot get XKB context");
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xkb_fill_state();
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}
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#define DEVICE_SPEC XCB_XKB_ID_USE_CORE_KBD
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void xkb_init(void) {
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wm.xkb_update_pending = false;
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wm.xkb_reload_keymap = false;
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wm.have_xkb = xkb_x11_setup_xkb_extension(
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wm.xcb_conn, XKB_X11_MIN_MAJOR_XKB_VERSION, XKB_X11_MIN_MINOR_XKB_VERSION,
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XKB_X11_SETUP_XKB_EXTENSION_NO_FLAGS, nullptr, nullptr, &wm.event_base_xkb,
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nullptr);
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printf("xkb base event: %u\n", wm.event_base_xkb);
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if (!wm.have_xkb) {
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warn("XKB not found or not supported");
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xkb_init_keymap();
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return;
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}
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xcb_xkb_per_client_flags_cookie_t cookie = xcb_xkb_per_client_flags(
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wm.xcb_conn, DEVICE_SPEC, XCB_XKB_PER_CLIENT_FLAG_DETECTABLE_AUTO_REPEAT,
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XCB_XKB_PER_CLIENT_FLAG_DETECTABLE_AUTO_REPEAT, 0, 0, 0);
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xcb_discard_reply(wm.xcb_conn, cookie.sequence);
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uint16_t xkb_event = XCB_XKB_EVENT_TYPE_STATE_NOTIFY |
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XCB_XKB_EVENT_TYPE_MAP_NOTIFY |
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XCB_XKB_EVENT_TYPE_NEW_KEYBOARD_NOTIFY;
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uint16_t map_parts =
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XCB_XKB_MAP_PART_KEY_TYPES | XCB_XKB_MAP_PART_KEY_SYMS |
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XCB_XKB_MAP_PART_MODIFIER_MAP | XCB_XKB_MAP_PART_EXPLICIT_COMPONENTS |
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XCB_XKB_MAP_PART_KEY_ACTIONS | XCB_XKB_MAP_PART_KEY_BEHAVIORS |
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XCB_XKB_MAP_PART_VIRTUAL_MODS | XCB_XKB_MAP_PART_VIRTUAL_MOD_MAP;
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xcb_xkb_select_events(wm.xcb_conn, DEVICE_SPEC, xkb_event, 0, xkb_event,
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map_parts, map_parts, nullptr);
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xkb_init_keymap();
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}
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void xkb_free(void) {
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if (wm.have_xkb) {
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xcb_xkb_select_events(wm.xcb_conn, DEVICE_SPEC, 0, 0, 0, 0, 0, nullptr);
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}
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xkb_state_unref(wm.xkb_state);
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xkb_context_unref(wm.xkb_ctx);
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wm.xkb_state = nullptr;
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wm.xkb_ctx = nullptr;
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}
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static void xkb_reload_keymap(void) {
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assert(wm.have_xkb);
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xcb_key_symbols_free(wm.key_symbols);
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wm.key_symbols = xcb_key_symbols_alloc(wm.xcb_conn);
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xwindow_grab_keys(wm.screen->root, key_list, countof(key_list));
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xkb_state_unref(wm.xkb_state);
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xkb_fill_state();
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}
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static gboolean xkb_refresh(gpointer ignore) {
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wm.xkb_update_pending = false;
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if (wm.xkb_reload_keymap) xkb_reload_keymap();
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wm.xkb_reload_keymap = false;
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return G_SOURCE_REMOVE;
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}
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static void xkb_schedule_refresh(void) {
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if (wm.xkb_update_pending) return;
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wm.xkb_update_pending = true;
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g_idle_add_full(G_PRIORITY_LOW, xkb_refresh, nullptr, nullptr);
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}
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void xkb_handle_event(xcb_generic_event_t *event) {
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assert(wm.have_xkb);
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/* XKB 中没有对应所有事件的泛型类型，xcb_generic_event_t 类型中的 pad0
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* 字段对应 XKB 事件中的 xkbType 字段，故用该字段判断 XKB 事件类型 */
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switch (event->pad0) {
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case XCB_XKB_NEW_KEYBOARD_NOTIFY: {
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wm.xkb_reload_keymap = true;
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xkb_schedule_refresh();
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break;
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}
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case XCB_XKB_MAP_NOTIFY: {
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wm.xkb_reload_keymap = true;
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xkb_schedule_refresh();
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break;
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}
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case XCB_XKB_STATE_NOTIFY: {
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xcb_xkb_state_notify_event_t *state_notify_event = (void *)event;
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xkb_state_update_mask(
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wm.xkb_state, state_notify_event->baseMods,
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state_notify_event->latchedMods, state_notify_event->lockedMods,
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state_notify_event->baseGroup, state_notify_event->latchedGroup,
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state_notify_event->lockedGroup);
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break;
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}
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}
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}
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