source: mainline/uspace/lib/gui/button.c@ 8c95dff

/*
 * 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 <malloc.h>

#include <drawctx.h>
#include <surface.h>

#include "window.h"
#include "button.h"

static void paint_internal(widget_t *w)
{
        button_t *btn = (button_t *) w;

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

        drawctx_t drawctx;

        drawctx_init(&drawctx, surface);
        drawctx_set_source(&drawctx, &btn->foreground);
        drawctx_transfer(&drawctx, w->hpos, w->vpos, w->width, w->height);

        if (w->width >= 6 && w->height >= 6) {
                drawctx_set_source(&drawctx, &btn->background);
                drawctx_transfer(&drawctx,
                    w->hpos + 3, w->vpos + 3, w->width - 6, w->height - 6);
        }

        sysarg_t cpt_width;
        sysarg_t cpt_height;
        font_get_box(&btn->font, btn->caption, &cpt_width, &cpt_height);
        if (w->width >= cpt_width && w->height >= cpt_height) {
                drawctx_set_source(&drawctx, &btn->foreground);
                drawctx_set_font(&drawctx, &btn->font);
                sysarg_t x = ((w->width - cpt_width) / 2) + w->hpos;
                sysarg_t y = ((w->height - cpt_height) / 2) + w->vpos;
                if (btn->caption) {
                        drawctx_print(&drawctx, btn->caption, x, y);
                }
        }

        window_yield(btn->widget.window);
}

void deinit_button(button_t *btn)
{
        widget_deinit(&btn->widget);
        free(btn->caption);
        font_release(&btn->font);
}

static void button_destroy(widget_t *widget)
{
        button_t *btn = (button_t *) widget;

        deinit_button(btn);
        
        free(btn);
}

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

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

static void button_handle_keyboard_event(widget_t *widget, kbd_event_t event)
{
        button_t *btn = (button_t *) widget;
        if (event.key == KC_ENTER && event.type == KEY_PRESS) {
                sig_send(&btn->clicked, NULL);
        }
}

static void button_handle_position_event(widget_t *widget, pos_event_t event)
{
        button_t *btn = (button_t *) widget;
        widget->window->focus = widget;

        // TODO make the click logic more robust (mouse grabbing, mouse moves)
        if (event.btn_num == 1) {
                if (event.type == POS_RELEASE) {
                        sig_send(&btn->clicked, NULL);
                }
        }
}

bool init_button(button_t *btn, widget_t *parent,
    const char *caption, uint16_t points, pixel_t background, pixel_t foreground)
{
        widget_init(&btn->widget, parent);

        btn->widget.destroy = button_destroy;
        btn->widget.reconfigure = button_reconfigure;
        btn->widget.rearrange = button_rearrange;
        btn->widget.repaint = button_repaint;
        btn->widget.handle_keyboard_event = button_handle_keyboard_event;
        btn->widget.handle_position_event = button_handle_position_event;

        source_init(&btn->background);
        source_set_color(&btn->background, background);
        source_init(&btn->foreground);
        source_set_color(&btn->foreground, foreground);

        if (caption == NULL) {
                btn->caption = NULL;
        } else {
                btn->caption = str_dup(caption);
        }
        font_init(&btn->font, FONT_DECODER_EMBEDDED, NULL, points);

        sysarg_t cpt_width;
        sysarg_t cpt_height;
        font_get_box(&btn->font, btn->caption, &cpt_width, &cpt_height);
        btn->widget.width_min = cpt_width + 8;
        btn->widget.height_min = cpt_height + 8;
        btn->widget.width_ideal = cpt_width + 28;
        btn->widget.height_ideal = cpt_height + 8;

        return true;
}

button_t *create_button(widget_t *parent,
    const char *caption, uint16_t points, pixel_t background, pixel_t foreground)
{
        button_t *btn = (button_t *) malloc(sizeof(button_t));
        if (!btn) {
                return NULL;
        }

        if (init_button(btn, parent, caption, points, background, foreground)) {
                return btn;
        } else {
                free(btn);
                return NULL;
        }
}

/** @}
 */