HelenOS sources

root/uspace/app/hello/hello.c

DEFINITIONS

1. wnd_close
2. hello
3. print_syntax
4. main

/*
 * Copyright (c) 2021 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup hello
 * @{
 */
/** @file Hello world (in UI)
 */

#include <gfx/coord.h>
#include <stdio.h>
#include <str.h>
#include <ui/fixed.h>
#include <ui/label.h>
#include <ui/resource.h>
#include <ui/ui.h>
#include <ui/window.h>
#include "hello.h"

static void wnd_close(ui_window_t *, void *);

static ui_window_cb_t window_cb = {
        .close = wnd_close
};

/** Window close button was clicked.
 *
 * @param window Window
 * @param arg Argument (hello)
 */
static void wnd_close(ui_window_t *window, void *arg)
{
        hello_t *hello = (hello_t *) arg;

        ui_quit(hello->ui);
}

/** Run hello world on display server. */
static errno_t hello(const char *display_spec)
{
        ui_t *ui = NULL;
        ui_wnd_params_t params;
        ui_window_t *window = NULL;
        hello_t hello;
        gfx_rect_t rect;
        ui_resource_t *ui_res;
        errno_t rc;

        rc = ui_create(display_spec, &ui);
        if (rc != EOK) {
                printf("Error creating UI on display %s.\n", display_spec);
                return rc;
        }

        ui_wnd_params_init(&params);
        params.caption = "Hello World";
        if (ui_is_textmode(ui)) {
                params.rect.p0.x = 0;
                params.rect.p0.y = 0;
                params.rect.p1.x = 24;
                params.rect.p1.y = 5;
        } else {
                params.rect.p0.x = 0;
                params.rect.p0.y = 0;
                params.rect.p1.x = 200;
                params.rect.p1.y = 60;
        }

        memset((void *) &hello, 0, sizeof(hello));
        hello.ui = ui;

        rc = ui_window_create(ui, &params, &window);
        if (rc != EOK) {
                printf("Error creating window.\n");
                return rc;
        }

        ui_window_set_cb(window, &window_cb, (void *) &hello);
        hello.window = window;

        ui_res = ui_window_get_res(window);

        rc = ui_fixed_create(&hello.fixed);
        if (rc != EOK) {
                printf("Error creating fixed layout.\n");
                return rc;
        }

        rc = ui_label_create(ui_res, "Hello, world!", &hello.label);
        if (rc != EOK) {
                printf("Error creating label.\n");
                return rc;
        }

        ui_window_get_app_rect(window, &rect);
        ui_label_set_rect(hello.label, &rect);
        ui_label_set_halign(hello.label, gfx_halign_center);
        ui_label_set_valign(hello.label, gfx_valign_center);

        rc = ui_fixed_add(hello.fixed, ui_label_ctl(hello.label));
        if (rc != EOK) {
                printf("Error adding control to layout.\n");
                return rc;
        }

        ui_window_add(window, ui_fixed_ctl(hello.fixed));

        rc = ui_window_paint(window);
        if (rc != EOK) {
                printf("Error painting window.\n");
                return rc;
        }

        ui_run(ui);

        ui_window_destroy(window);
        ui_destroy(ui);

        return EOK;
}

static void print_syntax(void)
{
        printf("Syntax: hello [-d <display-spec>]\n");
}

int main(int argc, char *argv[])
{
        const char *display_spec = UI_ANY_DEFAULT;
        errno_t rc;
        int i;

        i = 1;
        while (i < argc && argv[i][0] == '-') {
                if (str_cmp(argv[i], "-d") == 0) {
                        ++i;
                        if (i >= argc) {
                                printf("Argument missing.\n");
                                print_syntax();
                                return 1;
                        }

                        display_spec = argv[i++];
                } else {
                        printf("Invalid option '%s'.\n", argv[i]);
                        print_syntax();
                        return 1;
                }
        }

        if (i < argc) {
                print_syntax();
                return 1;
        }

        rc = hello(display_spec);
        if (rc != EOK)
                return 1;

        return 0;
}

/** @}
 */