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Add an env var for wayland output to grab input

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Add a new environment variable WLR_WL_GRAB_INPUT_SHORTCUT that lets
you specify a keyboard shortcut that when pressed,
will disable the keyboard shortcuts and confine the pointer
by using the function wlr_wl_backend_set_grab_input_shortcut.
This commit is contained in:
Lahav T 2023-11-21 23:09:36 +02:00 • committed by Lahav Tsur
parent fae0a7d493
commit f667a339eb
2 changed files with 66 additions and 0 deletions
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65
backend/backend.c
View file

@ -4,6 +4,8 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <strings.h>
#include <xkbcommon/xkbcommon.h>
#include <wayland-server-core.h>
#include <wlr/backend/headless.h>
@ -13,6 +15,7 @@
#include <wlr/config.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/util/log.h>
#include <wlr/types/wlr_keyboard.h>
#include "backend/backend.h"
#include "backend/multi.h"
#include "render/allocator/allocator.h"
@ -147,6 +150,37 @@ static size_t parse_outputs_env(const char *name) {
return outputs;
}
// This code was copied from sway wm source code,
// from https://github.com/swaywm/sway/blob/7cf4e1d/sway/input/keyboard.c
// ____________________________________________________
static struct modifier_key {
char *name;
uint32_t mod;
} modifiers[] = {
{ XKB_MOD_NAME_SHIFT, WLR_MODIFIER_SHIFT },
{ XKB_MOD_NAME_CAPS , WLR_MODIFIER_CAPS },
{ XKB_MOD_NAME_CTRL , WLR_MODIFIER_CTRL },
{ "Ctrl" , WLR_MODIFIER_CTRL },
{ XKB_MOD_NAME_ALT , WLR_MODIFIER_ALT },
{ "Alt" , WLR_MODIFIER_ALT },
{ XKB_MOD_NAME_NUM , WLR_MODIFIER_MOD2 },
{ "Mod3" , WLR_MODIFIER_MOD3 },
{ XKB_MOD_NAME_LOGO , WLR_MODIFIER_LOGO },
{ "Mod5" , WLR_MODIFIER_MOD5 },
};
static uint32_t get_modifier_mask_by_name(const char *name) {
int i;
for (i = 0; i < (int)(sizeof(modifiers) / sizeof(struct modifier_key)); ++i) {
if (strcasecmp(modifiers[i].name, name) == 0) {
return modifiers[i].mod;
}
}
return 0;
}
// ____________________________________________________)
static struct wlr_backend *attempt_wl_backend(struct wl_display *display) {
struct wlr_backend *backend = wlr_wl_backend_create(display, NULL);
if (backend == NULL) {
@ -158,6 +192,37 @@ static struct wlr_backend *attempt_wl_backend(struct wl_display *display) {
wlr_wl_output_create(backend);
}
char* keyboard_shortcut = getenv("WLR_WL_GRAB_INPUT_SHORTCUT");
if (keyboard_shortcut) {
wlr_log(WLR_INFO, "Loading user-specified input grab keyboard shortcut: %s",
keyboard_shortcut);
xkb_keysym_t input_grab_keysym = 0;
uint32_t input_grab_modifier_mask = 0;
keyboard_shortcut = strdup(keyboard_shortcut);
char *saveptr;
char *key_name = strtok_r(keyboard_shortcut, "+", &saveptr);
while (key_name != NULL) {
uint32_t modifier_mask = get_modifier_mask_by_name(key_name);
input_grab_modifier_mask = input_grab_modifier_mask | modifier_mask;
if(modifier_mask == 0) {
input_grab_keysym = xkb_keysym_from_name(key_name,XKB_KEYSYM_CASE_INSENSITIVE);
if(input_grab_keysym == 0) {
wlr_log(WLR_ERROR,
"The key shortcut contains an unrecognized key name. ignoring key shortcut");
input_grab_keysym = 0;
input_grab_modifier_mask = 0;
free(keyboard_shortcut);
return backend;
}
}
key_name = strtok_r(NULL, "+", &saveptr);
}
free(keyboard_shortcut);
wlr_wl_backend_set_grab_input_shortcut(backend, input_grab_modifier_mask, input_grab_keysym);
}
return backend;
}

1
docs/env_vars.md
View file

@ -39,6 +39,7 @@ wlroots reads these environment variables
## Wayland backend
* *WLR_WL_OUTPUTS*: when using the wayland backend specifies the number of outputs
* *WLR_WL_GRAB_INPUT_SHORTCUT*: when using the wayland backend, specify the shortcut (mods+key) to toggle input grab of the focused wayland output. Examples: control+shift+alt, control_r, alt_l.
## X11 backend