source: mainline/uspace/lib/ui/src/ui.c@ bfc0fc6

/*
 * 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 libui
 * @{
 */
/**
 * @file User interface
 */

#include <adt/list.h>
#include <ctype.h>
#include <display.h>
#include <errno.h>
#include <fibril.h>
#include <gfx/color.h>
#include <gfx/cursor.h>
#include <gfx/render.h>
#include <io/console.h>
#include <stdbool.h>
#include <stdlib.h>
#include <str.h>
#include <task.h>
#include <ui/ui.h>
#include <ui/wdecor.h>
#include <ui/window.h>
#include "../private/wdecor.h"
#include "../private/window.h"
#include "../private/ui.h"

/** Parse output specification.
 *
 * Output specification has the form <proto>@<service> where proto is
 * eiher 'disp' for display service, 'cons' for console, 'null'
 * for dummy output. Service is a location ID service name (e.g. hid/display).
 *
 * @param ospec Output specification
 * @param ws Place to store window system type (protocol)
 * @param osvc Place to store pointer to output service name
 */
static void ui_ospec_parse(const char *ospec, ui_winsys_t *ws,
    const char **osvc)
{
        const char *cp;

        cp = ospec;
        while (isalpha(*cp))
                ++cp;

        if (*cp == '@') {
                if (str_lcmp(ospec, "disp@", str_length("disp@")) == 0) {
                        *ws = ui_ws_display;
                } else if (str_lcmp(ospec, "cons@", str_length("cons@")) == 0) {
                        *ws = ui_ws_console;
                } else if (str_lcmp(ospec, "null@", str_length("null@")) == 0) {
                        *ws = ui_ws_null;
                } else if (str_lcmp(ospec, "@", str_length("@")) == 0) {
                        *ws = ui_ws_any;
                } else {
                        *ws = ui_ws_unknown;
                }

                if (cp[1] != '\0')
                        *osvc = cp + 1;
                else
                        *osvc = NULL;
        } else {
                *ws = ui_ws_display;
                *osvc = ospec;
        }
}

/** Create new user interface.
 *
 * @param ospec Output specification or @c UI_DISPLAY_DEFAULT to use
 *              the default display service, UI_CONSOLE_DEFAULT to use
 *              the default console service, UI_DISPLAY_NULL to use
 *              dummy output.
 * @param rui Place to store pointer to new UI
 * @return EOK on success or an error code
 */
errno_t ui_create(const char *ospec, ui_t **rui)
{
        errno_t rc;
        display_t *display;
        console_ctrl_t *console;
        console_gc_t *cgc;
        ui_winsys_t ws;
        const char *osvc;
        sysarg_t cols;
        sysarg_t rows;
        ui_t *ui;

        ui_ospec_parse(ospec, &ws, &osvc);

        if (ws == ui_ws_display || ws == ui_ws_any) {
                rc = display_open(osvc != NULL ? osvc : DISPLAY_DEFAULT,
                    &display);
                if (rc != EOK)
                        goto disp_fail;

                rc = ui_create_disp(display, &ui);
                if (rc != EOK) {
                        display_close(display);
                        goto disp_fail;
                }

                ui->myoutput = true;
                *rui = ui;
                return EOK;
        }

disp_fail:
        if (ws == ui_ws_console || ws == ui_ws_any) {
                console = console_init(stdin, stdout);
                if (console == NULL)
                        goto cons_fail;

                rc = console_get_size(console, &cols, &rows);
                if (rc != EOK) {
                        console_done(console);
                        goto cons_fail;
                }

                console_cursor_visibility(console, false);

                /* ws == ui_ws_console */
                rc = ui_create_cons(console, &ui);
                if (rc != EOK) {
                        console_done(console);
                        goto cons_fail;
                }

                rc = console_gc_create(console, NULL, &cgc);
                if (rc != EOK) {
                        ui_destroy(ui);
                        console_done(console);
                        goto cons_fail;
                }

                ui->cgc = cgc;
                ui->rect.p0.x = 0;
                ui->rect.p0.y = 0;
                ui->rect.p1.x = cols;
                ui->rect.p1.y = rows;

                (void) ui_paint(ui);
                ui->myoutput = true;
                *rui = ui;
                return EOK;
        }

cons_fail:
        if (ws == ui_ws_null) {
                rc = ui_create_disp(NULL, &ui);
                if (rc != EOK)
                        return rc;

                ui->myoutput = true;
                *rui = ui;
                return EOK;
        }

        return EINVAL;
}

/** Create new user interface using console service.
 *
 * @param rui Place to store pointer to new UI
 * @return EOK on success or an error code
 */
errno_t ui_create_cons(console_ctrl_t *console, ui_t **rui)
{
        ui_t *ui;

        ui = calloc(1, sizeof(ui_t));
        if (ui == NULL)
                return ENOMEM;

        ui->console = console;
        list_initialize(&ui->windows);
        *rui = ui;
        return EOK;
}

/** Create new user interface using display service.
 *
 * @param disp Display
 * @param rui Place to store pointer to new UI
 * @return EOK on success or an error code
 */
errno_t ui_create_disp(display_t *disp, ui_t **rui)
{
        ui_t *ui;

        ui = calloc(1, sizeof(ui_t));
        if (ui == NULL)
                return ENOMEM;

        ui->display = disp;
        list_initialize(&ui->windows);
        *rui = ui;
        return EOK;
}

/** Destroy user interface.
 *
 * @param ui User interface or @c NULL
 */
void ui_destroy(ui_t *ui)
{
        if (ui == NULL)
                return;

        if (ui->myoutput) {
                if (ui->cgc != NULL)
                        console_gc_delete(ui->cgc);
                if (ui->console != NULL) {
                        console_cursor_visibility(ui->console, true);
                        console_done(ui->console);
                }
                if (ui->display != NULL)
                        display_close(ui->display);
        }

        free(ui);
}

static void ui_cons_event_process(ui_t *ui, cons_event_t *event)
{
        ui_window_t *awnd;
        ui_evclaim_t claim;
        pos_event_t pos;

        awnd = ui_window_get_active(ui);
        if (awnd == NULL)
                return;

        switch (event->type) {
        case CEV_KEY:
                ui_window_send_kbd(awnd, &event->ev.key);
                break;
        case CEV_POS:
                pos = event->ev.pos;
                /* Translate event to window-relative coordinates */
                pos.hpos -= awnd->dpos.x;
                pos.vpos -= awnd->dpos.y;

                claim = ui_wdecor_pos_event(awnd->wdecor, &pos);
                /* Note: If event is claimed, awnd might not be valid anymore */
                if (claim == ui_unclaimed)
                        ui_window_send_pos(awnd, &pos);

                break;
        }
}

/** Execute user interface.
 *
 * Return task exit code of zero and block unitl the application starts
 * the termination process by calling ui_quit(@a ui).
 *
 * @param ui User interface
 */
void ui_run(ui_t *ui)
{
        cons_event_t event;
        usec_t timeout;
        errno_t rc;

        /* Only return command prompt if we are running in a separate window */
        if (ui->display != NULL)
                task_retval(0);

        while (!ui->quit) {
                if (ui->console != NULL) {
                        timeout = 100000;
                        rc = console_get_event_timeout(ui->console,
                            &event, &timeout);

                        /* Do we actually have an event? */
                        if (rc == EOK) {
                                ui_cons_event_process(ui, &event);
                        } else if (rc != ETIMEOUT) {
                                /* Error, quit */
                                break;
                        }
                } else {
                        fibril_usleep(100000);
                }
        }
}

/** Repaint UI (only used in fullscreen mode).
 *
 * This is used when an area is exposed in fullscreen mode.
 *
 * @param ui UI
 * @return @c EOK on success or an error code
 */
errno_t ui_paint(ui_t *ui)
{
        errno_t rc;
        gfx_context_t *gc;
        ui_window_t *awnd;
        gfx_color_t *color = NULL;

        /* In case of null output */
        if (ui->cgc == NULL)
                return EOK;

        gc = console_gc_get_ctx(ui->cgc);

        rc = gfx_color_new_ega(0x11, &color);
        if (rc != EOK)
                return rc;

        rc = gfx_set_color(gc, color);
        if (rc != EOK) {
                gfx_color_delete(color);
                return rc;
        }

        rc = gfx_fill_rect(gc, &ui->rect);
        if (rc != EOK) {
                gfx_color_delete(color);
                return rc;
        }

        gfx_color_delete(color);

        /* XXX Should repaint all windows */
        awnd = ui_window_get_active(ui);
        if (awnd == NULL)
                return EOK;

        rc = ui_wdecor_paint(awnd->wdecor);
        if (rc != EOK)
                return rc;

        return ui_window_paint(awnd);
}

/** Free up console for other users.
 *
 * Release console resources for another application (that the current
 * task is starting). After the other application finishes, resume
 * operation with ui_resume(). No calls to UI must happen inbetween
 * and no events must be processed (i.e. the calling function must not
 * return control to UI.
 *
 * @param ui UI
 * @return EOK on success or an error code
 */
errno_t ui_suspend(ui_t *ui)
{
        if (ui->cgc == NULL)
                return EOK;

        (void) console_set_caption(ui->console, "");
        return console_gc_suspend(ui->cgc);
}

/** Resume suspended UI.
 *
 * Reclaim console resources (after child application has finished running)
 * and restore UI operation previously suspended by calling ui_suspend().
 *
 * @param ui UI
 * @return EOK on success or an error code
 */
errno_t ui_resume(ui_t *ui)
{
        errno_t rc;
        ui_window_t *awnd;
        sysarg_t col;
        sysarg_t row;
        cons_event_t ev;

        if (ui->cgc == NULL)
                return EOK;

        rc = console_get_pos(ui->console, &col, &row);
        if (rc != EOK)
                return rc;

        /*
         * Here's a little heuristic to help determine if we need
         * to pause before returning to the UI. If we are in the
         * top-left corner, chances are the screen is empty and
         * there is no need to pause.
         */
        if (col != 0 || row != 0) {
                printf("Press any key or button to continue...\n");

                while (true) {
                        rc = console_get_event(ui->console, &ev);
                        if (rc != EOK)
                                return EIO;

                        if (ev.type == CEV_KEY && ev.ev.key.type == KEY_PRESS)
                                break;

                        if (ev.type == CEV_POS && ev.ev.pos.type == POS_PRESS)
                                break;
                }
        }

        rc = console_gc_resume(ui->cgc);
        if (rc != EOK)
                return rc;

        awnd = ui_window_get_active(ui);
        if (awnd != NULL)
                (void) console_set_caption(ui->console, awnd->wdecor->caption);

        return gfx_cursor_set_visible(console_gc_get_ctx(ui->cgc), false);
}

/** Terminate user interface.
 *
 * Calling this function causes the user interface to terminate
 * (i.e. exit from ui_run()). This would be typically called from
 * an event handler.
 *
 * @param ui User interface
 */
void ui_quit(ui_t *ui)
{
        ui->quit = true;
}

/** Determine if we are running in text mode.
 *
 * @param ui User interface
 * @return @c true iff we are running in text mode
 */
bool ui_is_textmode(ui_t *ui)
{
        /*
         * XXX Currently console is always text and display is always
         * graphics, but this need not always be true.
         */
        return (ui->console != NULL);
}

/** Determine if we are emulating windows.
 *
 * @param ui User interface
 * @return @c true iff we are running in text mode
 */
bool ui_is_fullscreen(ui_t *ui)
{
        return (ui->display == NULL);
}

/** @}
 */