source: mainline/uspace/lib/ui/src/slider.c@ b8b64a8

/*
 * 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 Slider
 */

#include <errno.h>
#include <gfx/color.h>
#include <gfx/context.h>
#include <gfx/render.h>
#include <io/pos_event.h>
#include <stdlib.h>
#include <str.h>
#include <ui/control.h>
#include <ui/paint.h>
#include <ui/slider.h>
#include "../private/resource.h"
#include "../private/slider.h"

/*
 * The kind reader will appreciate that slider button dimensions 23:15
 * are chosen such that, after subtracting the frame width (2 times 1),
 * we get 21:13, which is a good approximation of the golden ratio.
 */
enum {
        /** Slider button width */
        ui_slider_btn_w = 15,
        /** Slider button height */
        ui_slider_btn_h = 23,
        /** Slider button frame thickness */
        ui_slider_btn_frame_thickness = 1,
        /** Slider button bevel width */
        ui_slider_btn_bevel_width = 2,
        /** Slider groove width (total) */
        ui_slider_groove_width = 4,
        /** Amount by which slider groove bevel extendeds on each side
         * beyond nominal groove length.
         */
        ui_slider_groove_margin = 2
};

static void ui_slider_ctl_destroy(void *);
static errno_t ui_slider_ctl_paint(void *);
static ui_evclaim_t ui_slider_ctl_pos_event(void *, pos_event_t *);

/** Slider control ops */
ui_control_ops_t ui_slider_ops = {
        .destroy = ui_slider_ctl_destroy,
        .paint = ui_slider_ctl_paint,
        .pos_event = ui_slider_ctl_pos_event
};

/** Create new slider.
 *
 * @param resource UI resource
 * @param caption Caption
 * @param rslider Place to store pointer to new slider
 * @return EOK on success, ENOMEM if out of memory
 */
errno_t ui_slider_create(ui_resource_t *resource, const char *caption,
    ui_slider_t **rslider)
{
        ui_slider_t *slider;
        errno_t rc;

        slider = calloc(1, sizeof(ui_slider_t));
        if (slider == NULL)
                return ENOMEM;

        rc = ui_control_new(&ui_slider_ops, (void *) slider,
            &slider->control);
        if (rc != EOK) {
                free(slider);
                return rc;
        }

        slider->res = resource;
        *rslider = slider;
        return EOK;
}

/** Destroy slider.
 *
 * @param slider Slider or @c NULL
 */
void ui_slider_destroy(ui_slider_t *slider)
{
        if (slider == NULL)
                return;

        ui_control_delete(slider->control);
        free(slider);
}

/** Get base control from slider.
 *
 * @param slider Slider
 * @return Control
 */
ui_control_t *ui_slider_ctl(ui_slider_t *slider)
{
        return slider->control;
}

/** Set slider callbacks.
 *
 * @param slider Slider
 * @param cb Slider callbacks
 * @param arg Callback argument
 */
void ui_slider_set_cb(ui_slider_t *slider, ui_slider_cb_t *cb, void *arg)
{
        slider->cb = cb;
        slider->arg = arg;
}

/** Set slider rectangle.
 *
 * @param slider Slider
 * @param rect New slider rectangle
 */
void ui_slider_set_rect(ui_slider_t *slider, gfx_rect_t *rect)
{
        slider->rect = *rect;
}

/** Paint outer slider frame.
 *
 * @param slider Slider
 * @return EOK on success or an error code
 */
static errno_t ui_slider_paint_frame(ui_resource_t *res, gfx_rect_t *rect,
    gfx_coord_t thickness, gfx_rect_t *inside)
{
        gfx_rect_t drect;
        errno_t rc;

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

        drect.p0.x = rect->p0.x + 1;
        drect.p0.y = rect->p0.y;
        drect.p1.x = rect->p1.x - 1;
        drect.p1.y = rect->p0.y + thickness;
        rc = gfx_fill_rect(res->gc, &drect);
        if (rc != EOK)
                goto error;

        drect.p0.x = rect->p0.x + 1;
        drect.p0.y = rect->p1.y - thickness;
        drect.p1.x = rect->p1.x - 1;
        drect.p1.y = rect->p1.y;
        rc = gfx_fill_rect(res->gc, &drect);
        if (rc != EOK)
                goto error;

        drect.p0.x = rect->p0.x;
        drect.p0.y = rect->p0.y + 1;
        drect.p1.x = rect->p0.x + thickness;
        drect.p1.y = rect->p1.y - 1;
        rc = gfx_fill_rect(res->gc, &drect);
        if (rc != EOK)
                goto error;

        drect.p0.x = rect->p1.x - thickness;
        drect.p0.y = rect->p0.y + 1;
        drect.p1.x = rect->p1.x;
        drect.p1.y = rect->p1.y - 1;
        rc = gfx_fill_rect(res->gc, &drect);
        if (rc != EOK)
                goto error;

        if (inside != NULL) {
                inside->p0.x = rect->p0.x + thickness;
                inside->p0.y = rect->p0.y + thickness;
                inside->p1.x = rect->p1.x - thickness;
                inside->p1.y = rect->p1.y - thickness;
        }

        return EOK;
error:
        return rc;
}

/** Paint outset slider bevel.
 *
 * @param slider Slider
 * @return EOK on success or an error code
 */
static errno_t ui_slider_paint_outset(ui_slider_t *slider,
    gfx_rect_t *rect, gfx_rect_t *inside)
{
        return ui_paint_bevel(slider->res->gc, rect,
            slider->res->btn_highlight_color,
            slider->res->btn_shadow_color, ui_slider_btn_bevel_width, inside);
}

/** Determine slider button rectagle.
 *
 * @param slider Slider
 */
static void ui_slider_btn_rect(ui_slider_t *slider, gfx_rect_t *rect)
{
        gfx_coord2_t pos;

        pos.x = slider->rect.p0.x + slider->pos;
        pos.y = slider->rect.p0.y;

        rect->p0.x = pos.x;
        rect->p0.y = pos.y;
        rect->p1.x = pos.x + ui_slider_btn_w;
        rect->p1.y = pos.y + ui_slider_btn_h;
}

/** Determine slider length.
 *
 * @param slider Slider
 * @return Slider length in pixels
 */
gfx_coord_t ui_slider_length(ui_slider_t *slider)
{
        gfx_coord2_t dims;

        gfx_rect_dims(&slider->rect, &dims);
        return dims.x - ui_slider_btn_w;
}

/** Paint slider.
 *
 * @param slider Slider
 * @return EOK on success or an error code
 */
errno_t ui_slider_paint(ui_slider_t *slider)
{
        gfx_coord2_t pos;
        gfx_coord_t length;
        gfx_rect_t rect;
        gfx_rect_t brect;
        gfx_rect_t irect;
        errno_t rc;

        /* Paint slider groove */

        pos = slider->rect.p0;
        length = ui_slider_length(slider);

        rect.p0.x = pos.x + ui_slider_btn_w / 2 - ui_slider_groove_margin;
        rect.p0.y = pos.y + ui_slider_btn_h / 2 - ui_slider_groove_width / 2;
        rect.p1.x = pos.x + ui_slider_btn_w / 2 + length +
            ui_slider_groove_margin;
        rect.p1.y = pos.y + ui_slider_btn_h / 2 + ui_slider_groove_width / 2;

        rc = ui_paint_inset_frame(slider->res, &rect, NULL);
        if (rc != EOK)
                goto error;

        /* Paint slider button */

        ui_slider_btn_rect(slider, &rect);

        rc = ui_slider_paint_frame(slider->res, &rect,
            ui_slider_btn_frame_thickness, &brect);
        if (rc != EOK)
                goto error;

        rc = ui_slider_paint_outset(slider, &brect, &irect);
        if (rc != EOK)
                goto error;

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

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

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

        return EOK;
error:
        return rc;
}

/** Clear slider button.
 *
 * @param slider Slider
 * @return EOK on success or an error code
 */
errno_t ui_slider_btn_clear(ui_slider_t *slider)
{
        gfx_rect_t rect;
        errno_t rc;

        ui_slider_btn_rect(slider, &rect);

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

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

        return EOK;
error:
        return rc;
}

/** Press down slider.
 *
 * @param slider Slider
 * @param pos Pointer position
 */
void ui_slider_press(ui_slider_t *slider, gfx_coord2_t *pos)
{
        if (slider->held)
                return;

        slider->held = true;
        slider->press_pos = *pos;
        slider->last_pos = slider->pos;

        (void) ui_slider_paint(slider);
}

/** Release slider.
 *
 * @param slider Slider
 * @param pos Pointer position
 */
void ui_slider_release(ui_slider_t *slider, gfx_coord2_t *pos)
{
        if (!slider->held)
                return;

        ui_slider_update(slider, pos);
        slider->held = false;
}

/** Pointer moved.
 *
 * @param slider Slider
 * @param pos New pointer position
 */
void ui_slider_update(ui_slider_t *slider, gfx_coord2_t *pos)
{
        gfx_coord_t spos;
        gfx_coord_t length;

        if (slider->held) {
                spos = slider->last_pos + pos->x - slider->press_pos.x;
                length = ui_slider_length(slider);
                if (spos < 0)
                        spos = 0;
                if (spos > length)
                        spos = length;

                if (spos != slider->pos) {
                        (void) ui_slider_btn_clear(slider);
                        slider->pos = spos;
                        (void) ui_slider_paint(slider);
                        ui_slider_moved(slider, spos);
                }
        }
}

/** Slider was moved.
 *
 * @param slider Slider
 */
void ui_slider_moved(ui_slider_t *slider, gfx_coord_t pos)
{
        if (slider->cb != NULL && slider->cb->moved != NULL)
                slider->cb->moved(slider, slider->arg, pos);
}

/** Handle slider position event.
 *
 * @param slider Slider
 * @param pos_event Position event
 * @return @c ui_claimed iff the event is claimed
 */
ui_evclaim_t ui_slider_pos_event(ui_slider_t *slider, pos_event_t *event)
{
        gfx_coord2_t pos;
        gfx_rect_t rect;

        pos.x = event->hpos;
        pos.y = event->vpos;

        switch (event->type) {
        case POS_PRESS:
                ui_slider_btn_rect(slider, &rect);
                if (gfx_pix_inside_rect(&pos, &rect)) {
                        ui_slider_press(slider, &pos);
                        slider->press_pos = pos;
                        return ui_claimed;
                }
                break;
        case POS_RELEASE:
                if (slider->held) {
                        ui_slider_release(slider, &pos);
                        return ui_claimed;
                }
                break;
        case POS_UPDATE:
                ui_slider_update(slider, &pos);
                break;
        }

        return ui_unclaimed;
}

/** Destroy slider control.
 *
 * @param arg Argument (ui_slider_t *)
 */
void ui_slider_ctl_destroy(void *arg)
{
        ui_slider_t *slider = (ui_slider_t *) arg;

        ui_slider_destroy(slider);
}

/** Paint slider control.
 *
 * @param arg Argument (ui_slider_t *)
 * @return EOK on success or an error code
 */
errno_t ui_slider_ctl_paint(void *arg)
{
        ui_slider_t *slider = (ui_slider_t *) arg;

        return ui_slider_paint(slider);
}

/** Handle slider control position event.
 *
 * @param arg Argument (ui_slider_t *)
 * @param pos_event Position event
 * @return @c ui_claimed iff the event is claimed
 */
ui_evclaim_t ui_slider_ctl_pos_event(void *arg, pos_event_t *event)
{
        ui_slider_t *slider = (ui_slider_t *) arg;

        return ui_slider_pos_event(slider, event);
}

/** @}
 */