1 ex_gui_checkbox_release_8c example
gullradriel edited this page 2026-10-25 10:46:33 +01:00

ex_gui_checkbox_release.c

n_gui checkbox toggles on release, not on press Headless: events are made by hand and fed to n_gui_process_event(). A checkbox toggles, and calls on_toggle, when a press is RELEASED over it, as a button clicks. A press that leaves the box before the release (on a phone, a swipe that scrolls a settings list and happens to start on a checkbox) changes nothing, so a host that cancels a drag by moving the release elsewhere protects checkboxes as well as buttons. ```c

#define ALLEGRO_UNSTABLE 1

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h>

#include "nilorea/n_common.h" #include "nilorea/n_log.h" #include "nilorea/n_gui.h"

static int log_level = LOG_ERR; static int failures = 0; static int toggles = 0; static int last_checked = -1;

static void expect_true(const char* what, int ok) { if (!ok) { n_log(LOG_ERR, "FAIL: %s", what); failures++; } else { n_log(LOG_INFO, "ok: %s", what); } }

static int process_args(int argc, char** argv) { int opt = 0;

while ((opt = getopt(argc, argv, "V:")) != -1) {
    if (opt == 'V') {
        log_level = atoi(optarg);
    } else {
        return -1;
    }
}
return 0;

}

static void on_toggle(int widget_id, int checked, void* user_data) { (void)widget_id; (void)user_data; toggles++; last_checked = checked; }

static void feed(N_GUI_CTX* gui, int type, int x, int y) { ALLEGRO_EVENT ev; memset(&ev, 0, sizeof(ev)); ev.type = (ALLEGRO_EVENT_TYPE)type; ev.mouse.x = x; ev.mouse.y = y; ev.mouse.dx = type == ALLEGRO_EVENT_MOUSE_AXES ? 1 : 0; ev.mouse.button = type == ALLEGRO_EVENT_MOUSE_AXES ? 0u : 1u; (void)n_gui_process_event(gui, ev); }

int main(int argc, char** argv) { set_log_level(LOG_ERR); if (process_args(argc, argv) != 0) { fprintf(stderr, "Usage: %s [-V LOG_LEVEL]\n", argv[0]); return 2; } set_log_level(log_level);

if (!al_init() || !al_init_font_addon()) {
    n_log(LOG_ERR, "allegro init failed");
    return 1;
}
ALLEGRO_FONT* font = al_create_builtin_font();
if (!font) return 1;
N_GUI_CTX* gui = n_gui_new_ctx(font);
if (!gui) {
    al_destroy_font(font);
    return 1;
}
n_gui_set_display_size(gui, 400.0f, 300.0f);
int win = n_gui_add_window(gui, "W", 0.0f, 0.0f, 400.0f, 300.0f);
n_gui_window_set_flags(gui, win, N_GUI_WIN_FRAMELESS | N_GUI_WIN_FIXED_POSITION);
n_gui_open_window(gui, win);
int box = n_gui_add_checkbox(gui, win, "Mute groups", 50.0f, 50.0f, 150.0f, 30.0f, 0, on_toggle, NULL);

/* a click: press and release on the box */
feed(gui, ALLEGRO_EVENT_MOUSE_AXES, 60, 60);
feed(gui, ALLEGRO_EVENT_MOUSE_BUTTON_DOWN, 60, 60);
expect_true("a press alone does not toggle", toggles == 0 && !n_gui_checkbox_is_checked(gui, box));
feed(gui, ALLEGRO_EVENT_MOUSE_BUTTON_UP, 60, 60);
expect_true("the release over the box toggles it on", toggles == 1 && last_checked == 1 && n_gui_checkbox_is_checked(gui, box));

/* a release elsewhere on the box still counts */
feed(gui, ALLEGRO_EVENT_MOUSE_BUTTON_DOWN, 60, 60);
feed(gui, ALLEGRO_EVENT_MOUSE_AXES, 190, 70);
feed(gui, ALLEGRO_EVENT_MOUSE_BUTTON_UP, 190, 70);
expect_true("a release anywhere on the box toggles it off", toggles == 2 && last_checked == 0 && !n_gui_checkbox_is_checked(gui, box));

/* a swipe: press on the box, drag off it, release elsewhere */
feed(gui, ALLEGRO_EVENT_MOUSE_AXES, 60, 60);
feed(gui, ALLEGRO_EVENT_MOUSE_BUTTON_DOWN, 60, 60);
feed(gui, ALLEGRO_EVENT_MOUSE_AXES, 60, 150);
feed(gui, ALLEGRO_EVENT_MOUSE_AXES, 60, 250);
feed(gui, ALLEGRO_EVENT_MOUSE_BUTTON_UP, 60, 250);
expect_true("a press dragged off the box changes nothing", toggles == 2 && !n_gui_checkbox_is_checked(gui, box));

/* the reverse: press elsewhere, release on the box */
feed(gui, ALLEGRO_EVENT_MOUSE_AXES, 300, 250);
feed(gui, ALLEGRO_EVENT_MOUSE_BUTTON_DOWN, 300, 250);
feed(gui, ALLEGRO_EVENT_MOUSE_AXES, 60, 60);
feed(gui, ALLEGRO_EVENT_MOUSE_BUTTON_UP, 60, 60);
expect_true("a release on the box after a press elsewhere changes nothing", toggles == 2 && !n_gui_checkbox_is_checked(gui, box));

/* and a click still works after all that */
feed(gui, ALLEGRO_EVENT_MOUSE_BUTTON_DOWN, 60, 60);
feed(gui, ALLEGRO_EVENT_MOUSE_BUTTON_UP, 60, 60);
expect_true("a later click toggles it again", toggles == 3 && last_checked == 1 && n_gui_checkbox_is_checked(gui, box));

n_gui_destroy_ctx(&gui);
al_destroy_font(font);
if (failures) {
    fprintf(stderr, "ex_gui_checkbox_release: %d failure(s)\n", failures);
    return 1;
}
printf("ex_gui_checkbox_release: ok\n");
return 0;

}


_Filename: ex_gui_checkbox_release.c_