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main.c: add a real-time signal for toggling visibility of the keyboard

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Previously it was only possible to either show or hide the keyboard.
When you want to control the keyboard with a single button in, i.e.
a window manager, this requires a separate script to keep track of
state. This solves this by only needing one signal to toggle.

Since there are only 2 USR signals, I had to use real-time signals,
which are in the [POSIX
standard](https://standards.ieee.org/standard/1003_1b-1993.html) and
available in the [Linux kernel since
2.2](https://www.man7.org/linux/man-pages/man7/signal.7.html).
This commit is contained in:
Brandon Doornbos 2022-01-15 22:56:10 +01:00 committed by Maarten van Gompel
parent 07b9f293c0
commit e6c7d0ff2a
1 changed files with 19 additions and 4 deletions
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23
main.c
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@ -45,6 +45,7 @@ static int cur_x = -1, cur_y = -1;
static bool cur_press = false;
static struct kbd keyboard;
static uint32_t height, normal_height, landscape_height;
static bool hidden = false;
/* event handler prototypes */
static void wl_pointer_enter(void *data, struct wl_pointer *wl_pointer,
@ -370,6 +371,8 @@ hide(int sigint) {
wl_callback_destroy(draw_surf.cb);
draw_surf.cb = NULL;
}
hidden = true;
}
void
@ -396,6 +399,19 @@ show(int sigint) {
wl_display_roundtrip(display);
drwsurf_flip(&draw_surf);
hidden = false;
}
void
toggle_visibility(int sigint) {
signal(SIGRTMIN, toggle_visibility);
if (hidden) {
show(sigint);
} else {
hide(sigint);
}
}
void
@ -427,8 +443,6 @@ main(int argc, char **argv) {
keyboard.scheme1 = scheme1;
keyboard.scheme1 = scheme1;
bool starthidden = false;
int i;
for (i = 1; argv[i]; i++) {
if ((!strcmp(argv[i], "-v")) || (!strcmp(argv[i], "--version"))) {
@ -467,7 +481,7 @@ main(int argc, char **argv) {
keyboard.print_intersect = true;
} else if ((!strcmp(argv[i], "-hidden")) ||
(!strcmp(argv[i], "--hidden"))) {
starthidden = true;
hidden = true;
} else {
fprintf(stderr, "Invalid argument: %s\n", argv[i]);
usage(argv[0]);
@ -515,7 +529,7 @@ main(int argc, char **argv) {
draw_ctx.font_description =
pango_font_description_from_string(fc_font_pattern);
if (!starthidden) {
if (!hidden) {
draw_surf.surf = wl_compositor_create_surface(compositor);
layer_surface = zwlr_layer_shell_v1_get_layer_surface(
@ -536,6 +550,7 @@ main(int argc, char **argv) {
signal(SIGUSR1, hide);
signal(SIGUSR2, show);
signal(SIGPIPE, pipewarn);
signal(SIGRTMIN, toggle_visibility);
while (run_display) {
while (wl_display_dispatch(display) != -1 && layer_surface) {