source: mainline/uspace/lib/ui/src/menu.c@ d091007

/*
 * 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 Menu
 */

#include <adt/list.h>
#include <errno.h>
#include <gfx/color.h>
#include <gfx/context.h>
#include <gfx/render.h>
#include <gfx/text.h>
#include <io/pos_event.h>
#include <stdlib.h>
#include <str.h>
#include <ui/control.h>
#include <ui/paint.h>
#include <ui/menu.h>
#include <ui/menuentry.h>
#include <ui/resource.h>
#include "../private/menubar.h"
#include "../private/menu.h"
#include "../private/resource.h"

enum {
        menu_frame_w = 4,
        menu_frame_h = 4,
        menu_frame_w_text = 2,
        menu_frame_h_text = 1
};

/** Create new menu.
 *
 * @param mbar Menu bar
 * @param caption Caption
 * @param rmenu Place to store pointer to new menu
 * @return EOK on success, ENOMEM if out of memory
 */
errno_t ui_menu_create(ui_menu_bar_t *mbar, const char *caption,
    ui_menu_t **rmenu)
{
        ui_menu_t *menu;

        menu = calloc(1, sizeof(ui_menu_t));
        if (menu == NULL)
                return ENOMEM;

        menu->caption = str_dup(caption);
        if (menu->caption == NULL) {
                free(menu);
                return ENOMEM;
        }

        menu->mbar = mbar;
        list_append(&menu->lmenus, &mbar->menus);
        list_initialize(&menu->entries);

        *rmenu = menu;
        return EOK;
}

/** Destroy menu.
 *
 * @param menu Menu or @c NULL
 */
void ui_menu_destroy(ui_menu_t *menu)
{
        ui_menu_entry_t *mentry;

        if (menu == NULL)
                return;

        /* Destroy entries */
        mentry = ui_menu_entry_first(menu);
        while (mentry != NULL) {
                ui_menu_entry_destroy(mentry);
                mentry = ui_menu_entry_first(menu);
        }

        list_remove(&menu->lmenus);
        free(menu->caption);
        free(menu);
}

/** Get first menu in menu bar.
 *
 * @param mbar Menu bar
 * @return First menu or @c NULL if there is none
 */
ui_menu_t *ui_menu_first(ui_menu_bar_t *mbar)
{
        link_t *link;

        link = list_first(&mbar->menus);
        if (link == NULL)
                return NULL;

        return list_get_instance(link, ui_menu_t, lmenus);
}

/** Get next menu in menu bar.
 *
 * @param cur Current menu
 * @return Next menu or @c NULL if @a cur is the last one
 */
ui_menu_t *ui_menu_next(ui_menu_t *cur)
{
        link_t *link;

        link = list_next(&cur->lmenus, &cur->mbar->menus);
        if (link == NULL)
                return NULL;

        return list_get_instance(link, ui_menu_t, lmenus);
}

/** Get menu caption.
 *
 * @param menu Menu
 * @return Caption (owned by @a menu)
 */
const char *ui_menu_caption(ui_menu_t *menu)
{
        return menu->caption;
}

/** Get menu geometry.
 *
 * @param menu Menu
 * @param spos Starting position
 * @param geom Structure to fill in with computed geometry
 */
void ui_menu_get_geom(ui_menu_t *menu, gfx_coord2_t *spos,
    ui_menu_geom_t *geom)
{
        gfx_coord2_t edim;
        gfx_coord_t frame_w;
        gfx_coord_t frame_h;

        if (menu->mbar->res->textmode) {
                frame_w = menu_frame_w_text;
                frame_h = menu_frame_h_text;
        } else {
                frame_w = menu_frame_w;
                frame_h = menu_frame_h;
        }

        edim.x = ui_menu_entry_calc_width(menu, menu->max_caption_w,
            menu->max_shortcut_w);
        edim.y = menu->total_h;

        geom->outer_rect.p0 = *spos;
        geom->outer_rect.p1.x = spos->x + edim.x + 2 * frame_w;
        geom->outer_rect.p1.y = spos->y + edim.y + 2 * frame_h;

        geom->entries_rect.p0.x = spos->x + frame_w;
        geom->entries_rect.p0.y = spos->y + frame_h;
        geom->entries_rect.p1.x = geom->entries_rect.p0.x + edim.x;
        geom->entries_rect.p1.y = geom->entries_rect.p0.x + edim.y;
}

/** Get menu rectangle.
 *
 * @param menu Menu
 * @param spos Starting position (top-left corner)
 * @param rect Place to store menu rectangle
 */
void ui_menu_get_rect(ui_menu_t *menu, gfx_coord2_t *spos, gfx_rect_t *rect)
{
        ui_menu_geom_t geom;

        ui_menu_get_geom(menu, spos, &geom);
        *rect = geom.outer_rect;
}

/** Paint menu.
 *
 * @param menu Menu
 * @param spos Starting position (top-left corner)
 * @return EOK on success or an error code
 */
errno_t ui_menu_paint(ui_menu_t *menu, gfx_coord2_t *spos)
{
        ui_resource_t *res;
        gfx_coord2_t pos;
        ui_menu_entry_t *mentry;
        ui_menu_geom_t geom;
        gfx_rect_t bg_rect;
        errno_t rc;

        res = menu->mbar->res;
        ui_menu_get_geom(menu, spos, &geom);

        /* Paint menu frame */

        rc = gfx_set_color(res->gc, res->wnd_face_color);
        if (rc != EOK)
                goto error;

        rc = ui_paint_outset_frame(res, &geom.outer_rect, &bg_rect);
        if (rc != EOK)
                goto error;

        /* Paint menu background */

        rc = gfx_set_color(res->gc, res->wnd_face_color);
        if (rc != EOK)
                goto error;

        rc = gfx_fill_rect(res->gc, &bg_rect);
        if (rc != EOK)
                goto error;

        /* Paint entries */
        pos = geom.entries_rect.p0;

        mentry = ui_menu_entry_first(menu);
        while (mentry != NULL) {
                rc = ui_menu_entry_paint(mentry, &pos);
                if (rc != EOK)
                        goto error;

                pos.y += ui_menu_entry_height(mentry);
                mentry = ui_menu_entry_next(mentry);
        }

        rc = gfx_update(res->gc);
        if (rc != EOK)
                goto error;

        return EOK;
error:
        return rc;
}

/** Unpaint menu.
 *
 * @param menu Menu
 * @return EOK on success or an error code
 */
errno_t ui_menu_unpaint(ui_menu_t *menu)
{
        ui_resource_expose(menu->mbar->res);
        return EOK;
}

/** Handle position event in menu.
 *
 * @param menu Menu
 * @param spos Starting position (top-left corner)
 * @param event Position event
 * @return ui_claimed iff the event was claimed
 */
ui_evclaim_t ui_menu_pos_event(ui_menu_t *menu, gfx_coord2_t *spos,
    pos_event_t *event)
{
        ui_menu_geom_t geom;
        ui_menu_entry_t *mentry;
        gfx_coord2_t pos;
        gfx_coord2_t epos;
        ui_evclaim_t claimed;

        ui_menu_get_geom(menu, spos, &geom);
        epos.x = event->hpos;
        epos.y = event->vpos;

        pos = geom.entries_rect.p0;

        mentry = ui_menu_entry_first(menu);
        while (mentry != NULL) {
                claimed = ui_menu_entry_pos_event(mentry, &pos, event);
                if (claimed == ui_claimed)
                        return ui_claimed;

                pos.y += ui_menu_entry_height(mentry);
                mentry = ui_menu_entry_next(mentry);
        }

        /* Event inside menu? */
        if (gfx_pix_inside_rect(&epos, &geom.outer_rect)) {
                /* Claim event */
                return ui_claimed;
        } else {
                /* Press outside menu - close it */
                if (event->type == POS_PRESS)
                        ui_menu_bar_select(menu->mbar, NULL, NULL);
        }

        return ui_unclaimed;
}

/** @}
 */