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ex__accept__pool__client_8c ex__accept__pool__server_8c ex__allegro__4_8c ex__atlas_8c ex__avro_8c ex__base64_8c ex__bind__exclusive_8c ex__clipboard_8c ex__clock__sync_8c ex__common_8c ex__configfile_8c ex__cookies_8c ex__crypto_8c ex__diff_8c ex__digest_8c ex__disk__cache_8c ex__dns_8c ex__ecc_8c ex__entropy_8c ex__exceptions_8c ex__file_8c ex__file__copy_8c ex__fluid_8c ex__fluid__config_8c ex__fluid__config_8h ex__git_8c ex__gui_8c ex__gui__bench_8c ex__gui__button__keys_8c ex__gui__checkbox__label_8c ex__gui__checkbox__release_8c ex__gui__color__picker_8c ex__gui__colorwheel_8c ex__gui__combobox__items_8c ex__gui__combobox__wheel_8c ex__gui__cursor_8c ex__gui__curve_8c ex__gui__custom_8c ex__gui__custom__mouse_8c ex__gui__datagrid_8c ex__gui__datagrid__keys_8c ex__gui__datagrid__sort_8c ex__gui__detach_8c ex__gui__dictionary_8c ex__gui__display__fallback_8c ex__gui__double__click_8c ex__gui__dropmenu_8c ex__gui__frameless__drag_8c ex__gui__global__scroll_8c ex__gui__glyph_8c ex__gui__grid_8c ex__gui__hexview_8c ex__gui__hover_8c ex__gui__isometric_8c ex__gui__kvtable_8c ex__gui__label__fits_8c ex__gui__label__lines_8c ex__gui__layout__persist_8c ex__gui__listbox_8c ex__gui__md_8c ex__gui__multiwin_8c ex__gui__network_8c ex__gui__particles_8c ex__gui__placeholder_8c ex__gui__popup_8c ex__gui__progressbar_8c ex__gui__reentrant_8c ex__gui__round_8c ex__gui__sectionlist_8c ex__gui__slider__default_8c ex__gui__slider__handle_8c ex__gui__slider__step_8c ex__gui__splitpane_8c ex__gui__suggest_8c ex__gui__syntaxview_8c ex__gui__text__shorten_8c ex__gui__textarea__selection_8c ex__gui__tooltip_8c ex__gui__tree__lazy_8c ex__gui__tree__order_8c ex__gui__tree__state_8c ex__gui__window__rect_8c ex__gui__zorder_8c ex__hash_8c ex__hex_8c ex__html_8c ex__http2_8c ex__http2__server_8c ex__http3_8c ex__http__cookie_8c ex__http__form_8c ex__http__mime_8c ex__http__req_8c ex__http__response_8c ex__http__router_8c ex__http__server_8c ex__icc_8c ex__iso__astar_8c ex__json_8c ex__kafka_8c ex__linalg_8c ex__list_8c ex__log_8c ex__markdown_8c ex__module_8c ex__monolith_8c ex__network_8c ex__network_8h ex__network__accept_8c ex__network__alpn_8c ex__network__connect__abort_8c ex__network__mock_8c ex__network__proxy_8c ex__network__reactor_8c ex__network__sni_8c ex__network__sse_8c ex__network__ssl_8c ex__network__ssl__hardened_8c ex__network__ssl__hostname_8c ex__network__ssl__nonblock_8c ex__network__tls__defaults_8c ex__network__ws_8c ex__network__ws__limits_8c ex__nstr_8c ex__parallel__for_8c ex__parallel__team_8c ex__pcre_8c ex__pretty_8c ex__pth_8c ex__query_8c ex__random_8c ex__sha256_8c ex__signals_8c ex__spawn_8c ex__ssrf_8c ex__stack_8c ex__thread__pool__discard_8c ex__thread__pool__wait_8c ex__threads_8c ex__tiff_8c ex__time__formats_8c ex__trajectory_8c ex__trees_8c ex__url_8c ex__url__safe_8c ex__wrap_8c ex__x509_8c ex__zip_8c ex__zlib_8c ex_accept_pool_client_8c example ex_accept_pool_server_8c example ex_allegro_4_8c example ex_atlas_8c example ex_base64_8c example ex_clock_sync_8c example ex_common_8c example ex_configfile_8c example ex_cookies_8c example ex_crypto_8c example ex_diff_8c example ex_digest_8c example ex_disk_cache_8c example ex_dns_8c example ex_ecc_8c example ex_entropy_8c example ex_exceptions_8c example ex_file_8c example ex_file_copy_8c example ex_fluid_8c example ex_fluid_config_8c example ex_fluid_config_8h example ex_git_8c example ex_gui_8c example ex_gui_bench_8c example ex_gui_button_keys_8c example ex_gui_checkbox_label_8c example ex_gui_checkbox_release_8c example ex_gui_color_picker_8c example ex_gui_colorwheel_8c example ex_gui_combobox_items_8c example ex_gui_combobox_wheel_8c example ex_gui_cursor_8c example ex_gui_curve_8c example ex_gui_custom_8c example ex_gui_custom_mouse_8c example ex_gui_datagrid_8c example ex_gui_datagrid_keys_8c example ex_gui_datagrid_sort_8c example ex_gui_detach_8c example ex_gui_dictionary_8c example ex_gui_display_fallback_8c example ex_gui_double_click_8c example ex_gui_dropmenu_8c example ex_gui_frameless_drag_8c example ex_gui_global_scroll_8c example ex_gui_glyph_8c example ex_gui_grid_8c example ex_gui_hexview_8c example ex_gui_hover_8c example ex_gui_isometric_8c example ex_gui_kvtable_8c example ex_gui_label_fits_8c example ex_gui_label_lines_8c example ex_gui_layout_persist_8c example ex_gui_listbox_8c example ex_gui_md_8c example ex_gui_multiwin_8c example ex_gui_network_8c example ex_gui_particles_8c example ex_gui_placeholder_8c example ex_gui_popup_8c example ex_gui_progressbar_8c example ex_gui_reentrant_8c example ex_gui_round_8c example ex_gui_sectionlist_8c example ex_gui_slider_default_8c example ex_gui_slider_handle_8c example ex_gui_slider_step_8c example ex_gui_splitpane_8c example ex_gui_suggest_8c example ex_gui_syntaxview_8c example ex_gui_text_shorten_8c example ex_gui_textarea_selection_8c example ex_gui_tooltip_8c example ex_gui_tree_lazy_8c example ex_gui_tree_order_8c example ex_gui_tree_state_8c example ex_gui_window_rect_8c example ex_gui_zorder_8c example ex_hash_8c example ex_hex_8c example ex_html_8c example ex_http2_8c example ex_http2_server_8c example ex_http_cookie_8c example ex_http_form_8c example ex_http_mime_8c example ex_http_req_8c example ex_http_response_8c example ex_http_router_8c example ex_http_server_8c example ex_icc_8c example ex_iso_astar_8c example ex_json_8c example ex_kafka_8c example ex_linalg_8c example ex_list_8c example ex_log_8c example ex_markdown_8c example ex_module_8c example ex_monolith_8c example ex_network_8c example ex_network_8h example ex_network_accept_8c example ex_network_alpn_8c example ex_network_connect_abort_8c example ex_network_mock_8c example ex_network_proxy_8c example ex_network_reactor_8c example ex_network_sni_8c example ex_network_sse_8c example ex_network_ssl_8c example ex_network_ssl_hardened_8c example ex_network_ssl_hostname_8c example ex_network_ssl_nonblock_8c example ex_network_tls_defaults_8c example ex_network_ws_8c example ex_network_ws_limits_8c example ex_nstr_8c example ex_parallel_for_8c example ex_parallel_team_8c example ex_pcre_8c example ex_pretty_8c example ex_pth_8c example ex_query_8c example ex_random_8c example ex_sha256_8c example ex_signals_8c example ex_spawn_8c example ex_ssrf_8c example ex_stack_8c example ex_threads_8c example ex_tiff_8c example ex_time_formats_8c example ex_trajectory_8c example ex_trees_8c example ex_url_8c example ex_url_safe_8c example ex_wrap_8c example ex_x509_8c example ex_zip_8c example ex_zlib_8c example mainpage_8dox n__3d_8c n__3d_8h n__aabb_8c n__aabb_8h n__allegro5_8c n__allegro5_8h n__allegro__4_8c n__allegro__4_8h n__anim_8c n__anim_8h n__astar_8c n__astar_8h n__atlas_8c n__atlas_8h n__avro_8c n__avro_8h n__base64_8c n__base64_8h n__clipboard_8c n__clipboard_8h n__clock__sync_8c n__clock__sync_8h n__common_8c n__common_8h n__config__file_8c n__config__file_8h n__cookies_8c n__cookies_8h n__crypto_8c n__crypto_8h n__dead__reckoning_8c n__dead__reckoning_8h n__diff_8c n__diff_8h n__digest_8c n__digest_8h n__disk__cache_8c n__disk__cache_8h n__dns_8c n__dns_8h n__ecc_8c n__ecc_8h n__entropy_8c n__entropy_8h n__enum_8h n__exceptions_8c n__exceptions_8h n__files_8c n__files_8h n__fluids_8c n__fluids_8h n__games_8c n__games_8h n__git_8c n__git_8h n__gui_8c n__gui_8h n__gui__color_8c n__gui__color_8h n__gui__colorwheel_8c n__gui__colorwheel_8h n__gui__curve_8c n__gui__curve_8h n__gui__grid_8c n__gui__grid_8h n__gui__md_8c n__gui__md_8h n__gui__popup_8c n__gui__popup_8h n__hash_8c n__hash_8h n__hex_8c n__hex_8h n__html_8c n__html_8h n__http2_8c n__http2_8h n__http2__server_8c n__http2__server_8h n__http3_8c n__http3_8h n__http__cookie_8c n__http__cookie_8h n__http__form_8c n__http__form_8h n__http__mime_8c n__http__mime_8h n__http__req_8c n__http__req_8h n__http__response_8c n__http__response_8h n__http__router_8c n__http__router_8h n__http__server_8c n__http__server_8h n__icc_8c n__icc_8h n__iso__engine_8c n__iso__engine_8h n__json_8c n__json_8h n__kafka_8c n__kafka_8h n__linalg_8c n__linalg_8h n__list_8c n__list_8h n__log_8c n__log_8h n__lz4_8c n__lz4_8h n__markdown_8c n__markdown_8h n__module_8c n__module_8h n__network_8c n__network_8h n__network__accept__pool_8c n__network__accept__pool_8h n__network__msg_8c n__network__msg_8h n__nodup__log_8c n__nodup__log_8h n__openssl__compat_8h n__particles_8c n__particles_8h n__pcre_8c n__pcre_8h n__pretty_8c n__pretty_8h n__pth_8c n__pth_8h n__query_8c n__query_8h n__random_8c n__random_8h n__reactor_8c n__reactor_8h n__sha256_8c n__sha256_8h n__signals_8c n__signals_8h n__ssrf_8c n__ssrf_8h n__stack_8c n__stack_8h n__str_8c n__str_8h n__thread__pool_8c n__thread__pool_8h n__tiff_8c n__tiff_8h n__time_8c n__time_8h n__trajectory_8c n__trajectory_8h n__trees_8c n__trees_8h n__url__safe_8c n__url__safe_8h n__user_8c n__user_8h n__windows_8h n__wrap_8c n__wrap_8h n__x509_8c n__x509_8h n__zip_8c n__zip_8h n__zlib_8c n__zlib_8h nilorea_8h
6 ex_gui_textarea_selection_8c example
gullradriel edited this page 2026-10-09 00:55:18 +02:00
Table of Contents

ex_gui_textarea_selection.c

n_gui text area selection query An application that binds Ctrl+C to an action of its own has to decide, with a text field focused, whether the press is the field's copy or its own. The field's copy only does something when text is selected, so n_gui_textarea_has_selection() is the question to ask: yes leaves the key to the field, no lets the application take it.

Headless: the builtin font needs no display. ```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 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 ctrl_key(N_GUI_CTX* gui, int keycode) { ALLEGRO_EVENT ev;

memset(&ev, 0, sizeof(ev));
ev.type = ALLEGRO_EVENT_KEY_CHAR;
ev.keyboard.keycode = keycode;
ev.keyboard.modifiers = ALLEGRO_KEYMOD_CTRL;
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, 800.0f, 600.0f);
int win = n_gui_add_window(gui, "W", 0.0f, 0.0f, 300.0f, 200.0f);
int field = n_gui_add_textarea(gui, win, 10.0f, 10.0f, 200.0f, 24.0f, 0, 64, NULL, NULL);
int label = n_gui_add_label(gui, win, "not a text area", 10.0f, 40.0f, 200.0f, 20.0f, N_GUI_ALIGN_LEFT);

n_gui_textarea_set_text(gui, field, "Mont Blanc at dawn");
expect_true("a field with only a caret has nothing selected", !n_gui_textarea_has_selection(gui, field));

n_gui_textarea_set_selection(gui, field, 0, 9);
expect_true("a range set from code is a selection", n_gui_textarea_has_selection(gui, field));

n_gui_textarea_set_selection(gui, field, 9, 0);
expect_true("a range set backwards is one too", n_gui_textarea_has_selection(gui, field));

n_gui_textarea_set_selection(gui, field, 4, 4);
expect_true("an empty range is none", !n_gui_textarea_has_selection(gui, field));

/* Ctrl+A with the field focused selects all of it, as a person would. */
n_gui_set_focus(gui, field);
ctrl_key(gui, ALLEGRO_KEY_A);
expect_true("Ctrl+A selects the text", n_gui_textarea_has_selection(gui, field));

n_gui_textarea_set_text(gui, field, "");
n_gui_textarea_set_selection(gui, field, 0, 0);
expect_true("an empty field has nothing selected", !n_gui_textarea_has_selection(gui, field));

expect_true("a label is not a text area", !n_gui_textarea_has_selection(gui, label));
expect_true("a bad id has nothing selected", !n_gui_textarea_has_selection(gui, 99999));

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

}


_Filename: ex_gui_textarea_selection.c_

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