source: mainline/uspace/lib/gui/label.c@ a163d10

/*
 * Copyright (c) 2012 Petr Koupy
 * 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 gui
 * @{
 */
/**
 * @file
 */

#include <str.h>
#include <draw/drawctx.h>
#include <stdlib.h>
#include <draw/surface.h>
#include <draw/font.h>
#include <errno.h>
#include "window.h"
#include "label.h"

static void paint_internal(widget_t *widget)
{
        label_t *lbl = (label_t *) widget;

        surface_t *surface = window_claim(lbl->widget.window);
        if (!surface)
                window_yield(lbl->widget.window);

        drawctx_t drawctx;
        drawctx_init(&drawctx, surface);

        drawctx_set_source(&drawctx, &lbl->background);
        drawctx_transfer(&drawctx, widget->hpos, widget->vpos, widget->width,
            widget->height);

        sysarg_t cpt_width;
        sysarg_t cpt_height;
        font_get_box(lbl->font, lbl->caption, &cpt_width, &cpt_height);

        if ((widget->width >= cpt_width) && (widget->height >= cpt_height)) {
                sysarg_t x = ((widget->width - cpt_width) / 2) + widget->hpos;
                sysarg_t y = ((widget->height - cpt_height) / 2) + widget->vpos;

                drawctx_set_source(&drawctx, &lbl->text);
                drawctx_set_font(&drawctx, lbl->font);

                if (lbl->caption)
                        drawctx_print(&drawctx, lbl->caption, x, y);
        }

        window_yield(lbl->widget.window);
}

static void on_rewrite(widget_t *widget, void *data)
{
        if (data != NULL) {
                label_t *lbl = (label_t *) widget;

                const char *new_caption = (const char *) data;
                lbl->caption = str_dup(new_caption);

                sysarg_t cpt_width;
                sysarg_t cpt_height;
                font_get_box(lbl->font, lbl->caption, &cpt_width, &cpt_height);

                lbl->widget.width_min = cpt_width + 4;
                lbl->widget.height_min = cpt_height + 4;
                lbl->widget.width_ideal = lbl->widget.width_min;
                lbl->widget.height_ideal = lbl->widget.height_min;

                window_refresh(lbl->widget.window);
        }
}

void deinit_label(label_t *lbl)
{
        widget_deinit(&lbl->widget);
        free(lbl->caption);
        font_release(lbl->font);
}

static void label_destroy(widget_t *widget)
{
        label_t *lbl = (label_t *) widget;

        deinit_label(lbl);
        free(lbl);
}

static void label_reconfigure(widget_t *widget)
{
        /* no-op */
}

static void label_rearrange(widget_t *widget, sysarg_t hpos, sysarg_t vpos,
    sysarg_t width, sysarg_t height)
{
        widget_modify(widget, hpos, vpos, width, height);
        paint_internal(widget);
}

static void label_repaint(widget_t *widget)
{
        paint_internal(widget);
        window_damage(widget->window);
}

static void label_handle_keyboard_event(widget_t *widget, kbd_event_t event)
{
        /* no-op */
}

static void label_handle_position_event(widget_t *widget, pos_event_t event)
{
        /* no-op */
}

bool init_label(label_t *lbl, widget_t *parent, const void *data,
    const char *caption, uint16_t points, pixel_t background, pixel_t text)
{
        widget_init(&lbl->widget, parent, data);

        lbl->widget.destroy = label_destroy;
        lbl->widget.reconfigure = label_reconfigure;
        lbl->widget.rearrange = label_rearrange;
        lbl->widget.repaint = label_repaint;
        lbl->widget.handle_keyboard_event = label_handle_keyboard_event;
        lbl->widget.handle_position_event = label_handle_position_event;

        source_init(&lbl->background);
        source_set_color(&lbl->background, background);

        source_init(&lbl->text);
        source_set_color(&lbl->text, text);

        if (caption == NULL)
                lbl->caption = NULL;
        else
                lbl->caption = str_dup(caption);

        errno_t rc = embedded_font_create(&lbl->font, points);
        if (rc != EOK) {
                free(lbl->caption);
                lbl->caption = NULL;
                return false;
        }

        sysarg_t cpt_width;
        sysarg_t cpt_height;
        font_get_box(lbl->font, lbl->caption, &cpt_width, &cpt_height);

        lbl->widget.width_min = cpt_width + 4;
        lbl->widget.height_min = cpt_height + 4;
        lbl->widget.width_ideal = lbl->widget.width_min;
        lbl->widget.height_ideal = lbl->widget.height_min;

        lbl->rewrite = on_rewrite;

        return true;
}

label_t *create_label(widget_t *parent, const void *data, const char *caption,
    uint16_t points, pixel_t background, pixel_t text)
{
        label_t *lbl = (label_t *) malloc(sizeof(label_t));
        if (!lbl)
                return NULL;

        if (init_label(lbl, parent, data, caption, points, background, text))
                return lbl;

        free(lbl);
        return NULL;
}

/** @}
 */