source: mainline/uspace/app/uidemo/uidemo.c@ 297b1b3

/*
 * 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 uidemo
 * @{
 */
/** @file User interface demo
 */

#include <gfx/bitmap.h>
#include <gfx/coord.h>
#include <io/pixelmap.h>
#include <stdio.h>
#include <stdlib.h>
#include <str.h>
#include <ui/entry.h>
#include <ui/filedialog.h>
#include <ui/fixed.h>
#include <ui/image.h>
#include <ui/label.h>
#include <ui/menubar.h>
#include <ui/menuentry.h>
#include <ui/menu.h>
#include <ui/msgdialog.h>
#include <ui/pbutton.h>
#include <ui/resource.h>
#include <ui/ui.h>
#include <ui/window.h>
#include "uidemo.h"

static errno_t bitmap_moire(gfx_bitmap_t *, gfx_coord_t, gfx_coord_t);

static void wnd_close(ui_window_t *, void *);

static ui_window_cb_t window_cb = {
        .close = wnd_close
};

static void pb_clicked(ui_pbutton_t *, void *);

static ui_pbutton_cb_t pbutton_cb = {
        .clicked = pb_clicked
};

static void checkbox_switched(ui_checkbox_t *, void *, bool);

static ui_checkbox_cb_t checkbox_cb = {
        .switched = checkbox_switched
};

static void rb_selected(ui_rbutton_group_t *, void *, void *);

static ui_rbutton_group_cb_t rbutton_group_cb = {
        .selected = rb_selected
};

static void slider_moved(ui_slider_t *, void *, gfx_coord_t);

static ui_slider_cb_t slider_cb = {
        .moved = slider_moved
};

static void uidemo_file_load(ui_menu_entry_t *, void *);
static void uidemo_file_message(ui_menu_entry_t *, void *);
static void uidemo_file_exit(ui_menu_entry_t *, void *);

static void file_dialog_bok(ui_file_dialog_t *, void *, const char *);
static void file_dialog_bcancel(ui_file_dialog_t *, void *);
static void file_dialog_close(ui_file_dialog_t *, void *);

static ui_file_dialog_cb_t file_dialog_cb = {
        .bok = file_dialog_bok,
        .bcancel = file_dialog_bcancel,
        .close = file_dialog_close
};

static void msg_dialog_button(ui_msg_dialog_t *, void *, unsigned);
static void msg_dialog_close(ui_msg_dialog_t *, void *);

static ui_msg_dialog_cb_t msg_dialog_cb = {
        .button = msg_dialog_button,
        .close = msg_dialog_close
};

/** Horizontal alignment selected by each radio button */
static const gfx_halign_t uidemo_halign[3] = {
        gfx_halign_left,
        gfx_halign_center,
        gfx_halign_right
};

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

        ui_quit(demo->ui);
}

/** Push button was clicked.
 *
 * @param pbutton Push button
 * @param arg Argument (demo)
 */
static void pb_clicked(ui_pbutton_t *pbutton, void *arg)
{
        ui_demo_t *demo = (ui_demo_t *) arg;
        errno_t rc;

        if (pbutton == demo->pb1) {
                rc = ui_entry_set_text(demo->entry, "OK pressed");
                if (rc != EOK)
                        printf("Error changing entry text.\n");
        } else {
                rc = ui_entry_set_text(demo->entry, "Cancel pressed");
                if (rc != EOK)
                        printf("Error changing entry text.\n");
        }
}

/** Check box was switched.
 *
 * @param checkbox Check box
 * @param arg Argument (demo)
 */
static void checkbox_switched(ui_checkbox_t *checkbox, void *arg, bool enable)
{
        ui_demo_t *demo = (ui_demo_t *) arg;

        ui_entry_set_read_only(demo->entry, enable);
}

/** Radio button was selected.
 *
 * @param rbgroup Radio button group
 * @param garg Group argument (demo)
 * @param barg Button argument
 */
static void rb_selected(ui_rbutton_group_t *rbgroup, void *garg, void *barg)
{
        ui_demo_t *demo = (ui_demo_t *) garg;
        gfx_halign_t halign = *(gfx_halign_t *) barg;

        ui_entry_set_halign(demo->entry, halign);
        (void) ui_entry_paint(demo->entry);
}

/** Slider was moved.
 *
 * @param slider Slider
 * @param arg Argument (demo)
 * @param pos Position
 */
static void slider_moved(ui_slider_t *slider, void *arg, gfx_coord_t pos)
{
        ui_demo_t *demo = (ui_demo_t *) arg;
        char *str;
        errno_t rc;
        int rv;

        rv = asprintf(&str, "Slider at %d of %d", (int) pos,
            ui_slider_length(slider));
        if (rv < 0) {
                printf("Out of memory.\n");
                return;
        }

        rc = ui_entry_set_text(demo->entry, str);
        if (rc != EOK)
                printf("Error changing entry text.\n");
        (void) ui_entry_paint(demo->entry);

        free(str);
}

/** Display a message window.
 *
 * @param demo UI demo
 * @param caption Window caption
 * @param text Message text
 */
static void uidemo_show_message(ui_demo_t *demo, const char *caption,
    const char *text)
{
        ui_msg_dialog_params_t mdparams;
        ui_msg_dialog_t *dialog;
        errno_t rc;

        ui_msg_dialog_params_init(&mdparams);
        mdparams.caption = caption;
        mdparams.text = text;

        rc = ui_msg_dialog_create(demo->ui, &mdparams, &dialog);
        if (rc != EOK) {
                printf("Error creating message dialog.\n");
                return;
        }

        ui_msg_dialog_set_cb(dialog, &msg_dialog_cb, &demo);
}

/** File/load menu entry selected.
 *
 * @param mentry Menu entry
 * @param arg Argument (demo)
 */
static void uidemo_file_load(ui_menu_entry_t *mentry, void *arg)
{
        ui_demo_t *demo = (ui_demo_t *) arg;
        ui_file_dialog_params_t fdparams;
        ui_file_dialog_t *dialog;
        errno_t rc;

        ui_file_dialog_params_init(&fdparams);
        fdparams.caption = "Load File";

        rc = ui_file_dialog_create(demo->ui, &fdparams, &dialog);
        if (rc != EOK) {
                printf("Error creating message dialog.\n");
                return;
        }

        ui_file_dialog_set_cb(dialog, &file_dialog_cb, demo);
}

/** File/message menu entry selected.
 *
 * @param mentry Menu entry
 * @param arg Argument (demo)
 */
static void uidemo_file_message(ui_menu_entry_t *mentry, void *arg)
{
        ui_demo_t *demo = (ui_demo_t *) arg;
        ui_msg_dialog_params_t mdparams;
        ui_msg_dialog_t *dialog;
        errno_t rc;

        ui_msg_dialog_params_init(&mdparams);
        mdparams.caption = "Message For You";
        mdparams.text = "Hello, world!";

        rc = ui_msg_dialog_create(demo->ui, &mdparams, &dialog);
        if (rc != EOK) {
                printf("Error creating message dialog.\n");
                return;
        }

        ui_msg_dialog_set_cb(dialog, &msg_dialog_cb, &demo);
}

/** File/exit menu entry selected.
 *
 * @param mentry Menu entry
 * @param arg Argument (demo)
 */
static void uidemo_file_exit(ui_menu_entry_t *mentry, void *arg)
{
        ui_demo_t *demo = (ui_demo_t *) arg;

        ui_quit(demo->ui);
}

/** File dialog OK button press.
 *
 * @param dialog File dialog
 * @param arg Argument (ui_demo_t *)
 * @param fname File name
 */
static void file_dialog_bok(ui_file_dialog_t *dialog, void *arg,
    const char *fname)
{
        ui_demo_t *demo = (ui_demo_t *) arg;
        char buf[128];
        char *p;
        FILE *f;

        ui_file_dialog_destroy(dialog);

        f = fopen(fname, "rt");
        if (f == NULL) {
                uidemo_show_message(demo, "Error", "Error opening file.");
                return;
        }

        p = fgets(buf, sizeof(buf), f);
        if (p == NULL) {
                uidemo_show_message(demo, "Error", "Error reading file.");
                fclose(f);
                return;
        }

        /* Cut string off at the first non-printable character */
        p = buf;
        while (*p != '\0') {
                if (*p < ' ') {
                        *p = '\0';
                        break;
                }
                ++p;
        }

        ui_entry_set_text(demo->entry, buf);
        fclose(f);
}

/** File dialog cancel button press.
 *
 * @param dialog File dialog
 * @param arg Argument (ui_demo_t *)
 */
static void file_dialog_bcancel(ui_file_dialog_t *dialog, void *arg)
{
        ui_demo_t *demo = (ui_demo_t *) arg;

        (void) demo;
        ui_file_dialog_destroy(dialog);
}

/** Message dialog close request.
 *
 * @param dialog File dialog
 * @param arg Argument (ui_demo_t *)
 */
static void file_dialog_close(ui_file_dialog_t *dialog, void *arg)
{
        ui_demo_t *demo = (ui_demo_t *) arg;

        (void) demo;
        ui_file_dialog_destroy(dialog);
}

/** Message dialog button press.
 *
 * @param dialog Message dialog
 * @param arg Argument (ui_demo_t *)
 * @param bnum Button number
 */
static void msg_dialog_button(ui_msg_dialog_t *dialog, void *arg,
    unsigned bnum)
{
        ui_demo_t *demo = (ui_demo_t *) arg;

        (void) demo;
        ui_msg_dialog_destroy(dialog);
}

/** Message dialog close request.
 *
 * @param dialog Message dialog
 * @param arg Argument (ui_demo_t *)
 */
static void msg_dialog_close(ui_msg_dialog_t *dialog, void *arg)
{
        ui_demo_t *demo = (ui_demo_t *) arg;

        (void) demo;
        ui_msg_dialog_destroy(dialog);
}

/** Run UI demo on display server. */
static errno_t ui_demo(const char *display_spec)
{
        ui_t *ui = NULL;
        ui_wnd_params_t params;
        ui_window_t *window = NULL;
        ui_demo_t demo;
        gfx_rect_t rect;
        gfx_context_t *gc;
        ui_resource_t *ui_res;
        gfx_bitmap_params_t bparams;
        gfx_bitmap_t *bitmap;
        gfx_coord2_t off;
        ui_menu_entry_t *mmsg;
        ui_menu_entry_t *mload;
        ui_menu_entry_t *mfoo;
        ui_menu_entry_t *mbar;
        ui_menu_entry_t *mfoobar;
        ui_menu_entry_t *mexit;
        ui_menu_entry_t *mabout;
        errno_t rc;

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

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

        ui_wnd_params_init(&params);
        params.caption = "UI Demo";
        params.style |= ui_wds_resizable;

        /* FIXME: Auto layout */
        if (ui_is_textmode(ui)) {
                params.rect.p0.x = 0;
                params.rect.p0.y = 0;
                params.rect.p1.x = 80;
                params.rect.p1.y = 25;
        } else {
                params.rect.p0.x = 0;
                params.rect.p0.y = 0;
                params.rect.p1.x = 220;
                params.rect.p1.y = 350;
        }

        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 *) &demo);
        demo.window = window;

        ui_res = ui_window_get_res(window);
        gc = ui_window_get_gc(window);

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

        rc = ui_menu_bar_create(ui, window, &demo.mbar);
        if (rc != EOK) {
                printf("Error creating menu bar.\n");
                return rc;
        }

        rc = ui_menu_create(demo.mbar, "File", &demo.mfile);
        if (rc != EOK) {
                printf("Error creating menu.\n");
                return rc;
        }

        rc = ui_menu_entry_create(demo.mfile, "Message", "", &mmsg);
        if (rc != EOK) {
                printf("Error creating menu.\n");
                return rc;
        }

        ui_menu_entry_set_cb(mmsg, uidemo_file_message, (void *) &demo);

        rc = ui_menu_entry_create(demo.mfile, "Load", "", &mload);
        if (rc != EOK) {
                printf("Error creating menu.\n");
                return rc;
        }

        ui_menu_entry_set_cb(mload, uidemo_file_load, (void *) &demo);

        rc = ui_menu_entry_create(demo.mfile, "Foo", "Ctrl-Alt-Del", &mfoo);
        if (rc != EOK) {
                printf("Error creating menu.\n");
                return rc;
        }

        rc = ui_menu_entry_create(demo.mfile, "Bar", "", &mbar);
        if (rc != EOK) {
                printf("Error creating menu.\n");
                return rc;
        }

        rc = ui_menu_entry_create(demo.mfile, "Foobar", "", &mfoobar);
        if (rc != EOK) {
                printf("Error creating menu.\n");
                return rc;
        }

        rc = ui_menu_entry_sep_create(demo.mfile, &mexit);
        if (rc != EOK) {
                printf("Error creating menu.\n");
                return rc;
        }

        rc = ui_menu_entry_create(demo.mfile, "Exit", "Alt-F4", &mexit);
        if (rc != EOK) {
                printf("Error creating menu.\n");
                return rc;
        }

        ui_menu_entry_set_cb(mexit, uidemo_file_exit, (void *) &demo);

        rc = ui_menu_create(demo.mbar, "Edit", &demo.medit);
        if (rc != EOK) {
                printf("Error creating menu.\n");
                return rc;
        }

        rc = ui_menu_create(demo.mbar, "Preferences", &demo.mpreferences);
        if (rc != EOK) {
                printf("Error creating menu.\n");
                return rc;
        }

        rc = ui_menu_create(demo.mbar, "Help", &demo.mhelp);
        if (rc != EOK) {
                printf("Error creating menu.\n");
                return rc;
        }

        rc = ui_menu_entry_create(demo.mhelp, "About", "Ctrl-H, F1", &mabout);
        if (rc != EOK) {
                printf("Error creating menu.\n");
                return rc;
        }

        /* FIXME: Auto layout */
        if (ui_is_textmode(ui)) {
                rect.p0.x = 1;
                rect.p0.y = 2;
                rect.p1.x = 79;
                rect.p1.y = 3;
        } else {
                rect.p0.x = 4;
                rect.p0.y = 30;
                rect.p1.x = 216;
                rect.p1.y = 52;
        }
        ui_menu_bar_set_rect(demo.mbar, &rect);

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

        rc = ui_entry_create(window, "", &demo.entry);
        if (rc != EOK) {
                printf("Error creating entry.\n");
                return rc;
        }

        /* FIXME: Auto layout */
        if (ui_is_textmode(ui)) {
                rect.p0.x = 20;
                rect.p0.y = 4;
                rect.p1.x = 60;
                rect.p1.y = 5;
        } else {
                rect.p0.x = 15;
                rect.p0.y = 53;
                rect.p1.x = 205;
                rect.p1.y = 78;
        }

        ui_entry_set_rect(demo.entry, &rect);
        ui_entry_set_halign(demo.entry, gfx_halign_center);

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

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

        /* FIXME: Auto layout */
        if (ui_is_textmode(ui)) {
                rect.p0.x = 20;
                rect.p0.y = 6;
                rect.p1.x = 60;
                rect.p1.y = 7;
        } else {
                rect.p0.x = 60;
                rect.p0.y = 88;
                rect.p1.x = 160;
                rect.p1.y = 101;
        }

        ui_label_set_rect(demo.label, &rect);
        ui_label_set_halign(demo.label, gfx_halign_center);

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

        rc = ui_pbutton_create(ui_res, "OK", &demo.pb1);
        if (rc != EOK) {
                printf("Error creating button.\n");
                return rc;
        }

        ui_pbutton_set_cb(demo.pb1, &pbutton_cb, (void *) &demo);

        /* FIXME: Auto layout */
        if (ui_is_textmode(ui)) {
                rect.p0.x = 20;
                rect.p0.y = 8;
                rect.p1.x = 30;
                rect.p1.y = 9;
        } else {
                rect.p0.x = 15;
                rect.p0.y = 111;
                rect.p1.x = 105;
                rect.p1.y = 139;
        }

        ui_pbutton_set_rect(demo.pb1, &rect);

        ui_pbutton_set_default(demo.pb1, true);

        rc = ui_fixed_add(demo.fixed, ui_pbutton_ctl(demo.pb1));
        if (rc != EOK) {
                printf("Error adding control to layout.\n");
                return rc;
        }

        rc = ui_pbutton_create(ui_res, "Cancel", &demo.pb2);
        if (rc != EOK) {
                printf("Error creating button.\n");
                return rc;
        }

        ui_pbutton_set_cb(demo.pb2, &pbutton_cb, (void *) &demo);

        if (ui_is_textmode(ui)) {
                rect.p0.x = 50;
                rect.p0.y = 8;
                rect.p1.x = 60;
                rect.p1.y = 9;
        } else {
                rect.p0.x = 115;
                rect.p0.y = 111;
                rect.p1.x = 205;
                rect.p1.y = 139;
        }

        ui_pbutton_set_rect(demo.pb2, &rect);

        rc = ui_fixed_add(demo.fixed, ui_pbutton_ctl(demo.pb2));
        if (rc != EOK) {
                printf("Error adding control to layout.\n");
                return rc;
        }

        gfx_bitmap_params_init(&bparams);
        bparams.rect.p0.x = 0;
        bparams.rect.p0.y = 0;
        bparams.rect.p1.x = 188;
        bparams.rect.p1.y = 24;

        rc = gfx_bitmap_create(gc, &bparams, NULL, &bitmap);
        if (rc != EOK)
                return rc;

        rc = bitmap_moire(bitmap, bparams.rect.p1.x, bparams.rect.p1.y);
        if (rc != EOK)
                return rc;

        rc = ui_image_create(ui_res, bitmap, &params.rect, &demo.image);
        if (rc != EOK) {
                printf("Error creating label.\n");
                return rc;
        }

        off.x = 15;
        off.y = 155;
        gfx_rect_translate(&off, &bparams.rect, &rect);

        /* Adjust for frame width (2 x 1 pixel) */
        rect.p1.x += 2;
        rect.p1.y += 2;
        ui_image_set_rect(demo.image, &rect);
        ui_image_set_flags(demo.image, ui_imgf_frame);

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

        rc = ui_checkbox_create(ui_res, "Read only", &demo.checkbox);
        if (rc != EOK) {
                printf("Error creating check box.\n");
                return rc;
        }

        ui_checkbox_set_cb(demo.checkbox, &checkbox_cb, (void *) &demo);

        /* FIXME: Auto layout */
        if (ui_is_textmode(ui)) {
                rect.p0.x = 20;
                rect.p0.y = 12;
                rect.p1.x = 40;
                rect.p1.y = 13;
        } else {
                rect.p0.x = 15;
                rect.p0.y = 190;
                rect.p1.x = 140;
                rect.p1.y = 210;
        }
        ui_checkbox_set_rect(demo.checkbox, &rect);

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

        rc = ui_rbutton_group_create(ui_res, &demo.rbgroup);
        if (rc != EOK) {
                printf("Error creating radio button group.\n");
                return rc;
        }

        rc = ui_rbutton_create(demo.rbgroup, "Left", (void *) &uidemo_halign[0],
            &demo.rbleft);
        if (rc != EOK) {
                printf("Error creating radio button.\n");
                return rc;
        }

        ui_rbutton_group_set_cb(demo.rbgroup, &rbutton_group_cb,
            (void *) &demo);

        /* FIXME: Auto layout */
        if (ui_is_textmode(ui)) {
                rect.p0.x = 20;
                rect.p0.y = 14;
                rect.p1.x = 40;
                rect.p1.y = 15;
        } else {
                rect.p0.x = 15;
                rect.p0.y = 220;
                rect.p1.x = 140;
                rect.p1.y = 240;
        }
        ui_rbutton_set_rect(demo.rbleft, &rect);

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

        rc = ui_rbutton_create(demo.rbgroup, "Center", (void *) &uidemo_halign[1],
            &demo.rbcenter);
        if (rc != EOK) {
                printf("Error creating radio button.\n");
                return rc;
        }

        /* FIXME: Auto layout */
        if (ui_is_textmode(ui)) {
                rect.p0.x = 20;
                rect.p0.y = 15;
                rect.p1.x = 40;
                rect.p1.y = 16;
        } else {
                rect.p0.x = 15;
                rect.p0.y = 250;
                rect.p1.x = 140;
                rect.p1.y = 270;
        }
        ui_rbutton_set_rect(demo.rbcenter, &rect);
        ui_rbutton_select(demo.rbcenter);

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

        rc = ui_rbutton_create(demo.rbgroup, "Right", (void *) &uidemo_halign[2],
            &demo.rbright);
        if (rc != EOK) {
                printf("Error creating radio button.\n");
                return rc;
        }

        /* FIXME: Auto layout */
        if (ui_is_textmode(ui)) {
                rect.p0.x = 20;
                rect.p0.y = 16;
                rect.p1.x = 40;
                rect.p1.y = 17;
        } else {
                rect.p0.x = 15;
                rect.p0.y = 280;
                rect.p1.x = 140;
                rect.p1.y = 300;
        }
        ui_rbutton_set_rect(demo.rbright, &rect);

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

        rc = ui_slider_create(ui_res, "Slide!", &demo.slider);
        if (rc != EOK) {
                printf("Error creating button.\n");
                return rc;
        }

        ui_slider_set_cb(demo.slider, &slider_cb, (void *) &demo);

        rect.p0.x = 15;
        rect.p0.y = 310;
        rect.p1.x = 130;
        rect.p1.y = 330;
        ui_slider_set_rect(demo.slider, &rect);

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

        ui_window_add(window, ui_fixed_ctl(demo.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;
}

/** Fill bitmap with moire pattern.
 *
 * @param bitmap Bitmap
 * @param w Bitmap width
 * @param h Bitmap height
 * @return EOK on success or an error code
 */
static errno_t bitmap_moire(gfx_bitmap_t *bitmap, gfx_coord_t w, gfx_coord_t h)
{
        int i, j;
        int k;
        pixelmap_t pixelmap;
        gfx_bitmap_alloc_t alloc;
        errno_t rc;

        rc = gfx_bitmap_get_alloc(bitmap, &alloc);
        if (rc != EOK)
                return rc;

        /* In absence of anything else, use pixelmap */
        pixelmap.width = w;
        pixelmap.height = h;
        pixelmap.data = alloc.pixels;

        for (i = 0; i < w; i++) {
                for (j = 0; j < h; j++) {
                        k = i * i + j * j;
                        pixelmap_put_pixel(&pixelmap, i, j,
                            PIXEL(255, k, k, 255 - k));
                }
        }

        return EOK;
}

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

int main(int argc, char *argv[])
{
        const char *display_spec = UI_DISPLAY_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 = ui_demo(display_spec);
        if (rc != EOK)
                return 1;

        return 0;
}

/** @}
 */