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eda-tools/eeshow/gui-over.c
Werner Almesberger 6bb814bae6 eeshow/gui-over.h: use struct for color, instead of array
That way, we can use assignments on them.
2016-08-09 16:01:01 -03:00

273 lines
6.2 KiB
C

/*
* gui-over.c - GUI: overlays
*
* Written 2016 by Werner Almesberger
* Copyright 2016 by Werner Almesberger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
/*
* Resources:
*
* http://zetcode.com/gfx/cairo/cairobackends/
* https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html
* https://www.cairographics.org/samples/rounded_rectangle/
*
* Section "Description" in
* https://developer.gnome.org/pango/stable/pango-Cairo-Rendering.html
*/
#include <stddef.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <cairo/cairo.h>
#include <pango/pangocairo.h>
#include "util.h"
#include "fmt-pango.h"
#include "gui-aoi.h"
#include "gui-style.h"
#include "gui-over.h"
struct overlay {
const char *s;
struct overlay_style style;
struct aoi **aois;
bool (*hover)(void *user, bool on);
void (*click)(void *user);
void *user;
struct aoi *aoi;
struct overlay *next;
};
static void rrect(cairo_t *cr, int x, int y, int w, int h, int r)
{
const double deg = M_PI / 180.0;
cairo_new_path(cr);
cairo_arc(cr, x + w - r, y + r, r, -90 * deg, 0);
cairo_arc(cr, x + w - r, y + h - r, r, 0, 90 * deg);
cairo_arc(cr, x + r, y + h - r, r, 90 * deg, 180 * deg);
cairo_arc(cr, x + r, y + r, r, 180 * deg, 270 * deg);
cairo_close_path(cr);
}
struct overlay *overlay_draw(struct overlay *over, cairo_t *cr, int *x, int *y)
{
const struct overlay_style *style = &over->style;
const struct color *fg = &style->fg;
const struct color *bg = &style->bg;
const struct color *frame = &style->frame;
unsigned ink_w, ink_h; /* effectively used text area size */
unsigned w, h; /* box size */
int tx, ty; /* text start position */
int sx, sy; /* box start position */
PangoLayout *layout;
PangoFontDescription *desc;
PangoRectangle ink_rect;
desc = pango_font_description_from_string(style->font);
layout = pango_cairo_create_layout(cr);
pango_layout_set_font_description(layout, desc);
pango_layout_set_markup(layout, over->s, -1);
pango_font_description_free(desc);
pango_layout_get_extents(layout, &ink_rect, NULL);
#if 0
fprintf(stderr, "%d + %d %d + %d\n",
ink_rect.x / PANGO_SCALE, ink_rect.width / PANGO_SCALE,
ink_rect.y / PANGO_SCALE, ink_rect.height / PANGO_SCALE);
#endif
ink_w = ink_rect.width / PANGO_SCALE;
ink_h = ink_rect.height / PANGO_SCALE;
ink_w = ink_w > style->wmin ? ink_w : style->wmin;
ink_w = !style->wmax || ink_w < style->wmax ? ink_w : style->wmax;
w = ink_w + 2 * style->pad;
h = ink_h + 2 * style->pad;
sx = *x;
sy = *y;
if (sx < 0 || sy < 0) {
double x1, y1, x2, y2;
int sw, sh;
cairo_clip_extents(cr, &x1, &y1, &x2, &y2);
sw = x2 - x1;
sh = y2 - y1;
if (sx < 0)
sx = sw + sx - w;
if (sy < 0)
sy = sh + sy - h;
}
tx = sx - ink_rect.x / PANGO_SCALE + style->pad;
ty = sy - ink_rect.y / PANGO_SCALE + style->pad;
rrect(cr, sx, sy, w, h, style->radius);
cairo_set_source_rgba(cr, bg->r, bg->g, bg->b, bg->alpha);
cairo_fill_preserve(cr);
cairo_set_source_rgba(cr, frame->r, frame->g, frame->b, frame->alpha);
cairo_set_line_width(cr, style->width);
cairo_stroke(cr);
if (style->wmax) {
cairo_new_path(cr);
#if 0
fprintf(stderr, "%u(%d) %u %.60s\n", ty, ink_rect.y / PANGO_SCALE, ink_h, over->s);
#endif
/*
* @@@ for some mysterious reason, we get
* ink_h = ink_rect.height / PANGO_SCALE = 5
* instead of 2 if using overlay_style_dense_selected. Strangely, changing
* overlay_style_dense_selected such that it becomes more like
* overlay_style_dense has no effect.
*
* This causes the text to be cut vertically, roughly in the middle. We hack
* around this problem by growind the clipping area vertically. This works,
* since we're currently only concerned about horizontal clipping anyway.
*/
cairo_rectangle(cr, tx, ty, ink_w, ink_h + 20);
cairo_clip(cr);
}
cairo_set_source_rgba(cr, fg->r, fg->g, fg->b, fg->alpha);
cairo_move_to(cr, tx, ty);
pango_cairo_update_layout(cr, layout);
pango_cairo_show_layout(cr, layout);
cairo_reset_clip(cr);
g_object_unref(layout);
if (over->hover || over->click) {
struct aoi aoi_cfg = {
.x = sx,
.y = sy,
.w = w,
.h = h,
.hover = over->hover,
.click = over->click,
.user = over->user,
};
if (over->aoi)
aoi_update(over->aoi, &aoi_cfg);
else
over->aoi = aoi_add(over->aois, &aoi_cfg);
}
if (*y >= 0)
*y += h + style->skip;
else
*y -= h + style->skip;
return over->next;
}
void overlay_draw_all(struct overlay *overlays, cairo_t *cr, int x, int y)
{
struct overlay *over;
for (over = overlays; over; over = over->next)
overlay_draw(over, cr, &x, &y);
}
struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois,
bool (*hover)(void *user, bool on), void (*click)(void *user), void *user)
{
struct overlay *over;
struct overlay **anchor;
over = alloc_type(struct overlay);
over->s = NULL;
over->style = overlay_style_default;
over->aois = aois;
over->hover = hover;
over->click = click;
over->user = user;
over->aoi = NULL;
for (anchor = overlays; *anchor; anchor = &(*anchor)->next);
over->next = NULL;
*anchor = over;
return over;
}
void overlay_style(struct overlay *over, const struct overlay_style *style)
{
over->style = *style;
}
void overlay_text_raw(struct overlay *over, const char *s)
{
free((char *) over->s);
over->s = stralloc(s);
}
void overlay_text(struct overlay *over, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
overlay_text_raw(over, vfmt_pango(fmt, ap));
va_end(ap);
}
static void overlay_free(struct overlay *over)
{
if (over->aoi)
aoi_remove(over->aois, over->aoi);
free((void *) over->s);
free(over);
}
void overlay_remove(struct overlay **overlays, struct overlay *over)
{
struct overlay **anchor;
for (anchor = overlays; *anchor; anchor = &(*anchor)->next)
if (*anchor == over) {
*anchor = over->next;
overlay_free(over);
return;
}
abort();
}
void overlay_remove_all(struct overlay **overlays)
{
struct overlay *next;
while (*overlays) {
next = (*overlays)->next;
overlay_free(*overlays);
*overlays = next;
}
}