Modular status panel for X11 and Wayland, inspired by https://github.com/jaagr/polybar
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#include <stdlib.h>
#include <string.h>
#include <assert.h>
#define LOG_MODULE "progress_bar"
#define LOG_ENABLE_DBG 0
#include "../log.h"
#include "../config.h"
#include "../config-verify.h"
#include "../particle.h"
#include "../plugin.h"
struct private {
char *tag;
int width;
struct particle *start_marker;
struct particle *end_marker;
struct particle *fill;
struct particle *empty;
struct particle *indicator;
};
struct eprivate {
size_t count;
struct exposable **exposables;
};
static void
particle_destroy(struct particle *particle)
{
struct private *p = particle->private;
p->start_marker->destroy(p->start_marker);
p->end_marker->destroy(p->end_marker);
p->fill->destroy(p->fill);
p->empty->destroy(p->empty);
p->indicator->destroy(p->indicator);
free(p->tag);
free(p);
particle_default_destroy(particle);
}
static void
exposable_destroy(struct exposable *exposable)
{
struct eprivate *e = exposable->private;
for (size_t i = 0; i < e->count; i++)
e->exposables[i]->destroy(e->exposables[i]);
free(e->exposables);
free(e);
exposable_default_destroy(exposable);
}
static int
begin_expose(struct exposable *exposable)
{
struct eprivate *e = exposable->private;
/* Margins */
exposable->width = exposable->particle->left_margin +
exposable->particle->right_margin;
/* Sub-exposables */
for (size_t i = 0; i < e->count; i++)
exposable->width += e->exposables[i]->begin_expose(e->exposables[i]);
return exposable->width;
}
static void
expose(const struct exposable *exposable, pixman_image_t *pix, int x, int y, int height)
{
const struct eprivate *e = exposable->private;
exposable_render_deco(exposable, pix, x, y, height);
x += exposable->particle->left_margin;
for (size_t i = 0; i < e->count; i++) {
e->exposables[i]->expose(e->exposables[i], pix, x, y, height);
x += e->exposables[i]->width;
}
}
static void
on_mouse(struct exposable *exposable, struct bar *bar, enum mouse_event event,
int x, int y)
{
if (exposable->on_click == NULL) {
exposable_default_on_mouse(exposable, bar, event, x, y);
return;
}
/*
* Hack-warning!
*
* In order to pass the *clicked* position to the on_click
* handler, we expand the handler *again* (first time would be
* when the particle instantiated us).
*
* We pass a single tag, "where", which is a percentage value.
*
* Keep a reference to the un-expanded string, to be able to reset
* it after executing the handler.
*
* Note that we only consider the actual progress bar to be
* clickable. This means we ignore the start and end markers.
*/
const struct particle *p = exposable->particle;
const struct eprivate *e = exposable->private;
/* Start of empty/fill cells */
int x_offset = p->left_margin + e->exposables[0]->width;
/* Mouse is *before* progress-bar? */
if (x < x_offset) {
if (x >= p->left_margin) {
/* Mouse is over the start-marker */
struct exposable *start = e->exposables[0];
if (start->on_mouse != NULL)
start->on_mouse(start, bar, event, x - p->left_margin, y);
} else {
/* Mouse if over left margin */
bar->set_cursor(bar, "left_ptr");
}
return;
}
/* Size of the clickable area (the empty/fill cells) */
int clickable_width = 0;
for (size_t i = 1; i < e->count - 1; i++)
clickable_width += e->exposables[i]->width;
/* Mouse is *after* progress-bar? */
if (x - x_offset > clickable_width) {
if (x - x_offset - clickable_width < e->exposables[e->count - 1]->width) {
/* Mouse is over the end-marker */
struct exposable *end = e->exposables[e->count - 1];
if (end->on_mouse != NULL)
end->on_mouse(end, bar, event, x - x_offset - clickable_width, y);
} else {
/* Mouse is over the right margin */
bar->set_cursor(bar, "left_ptr");
}
return;
}
/* Remember the original handler, so that we can restore it */
char *original = exposable->on_click;
if (event == ON_MOUSE_CLICK) {
long where = clickable_width > 0
? 100 * (x - x_offset) / clickable_width
: 0;
struct tag_set tags = {
.tags = (struct tag *[]){tag_new_int(NULL, "where", where)},
.count = 1,
};
exposable->on_click = tags_expand_template(exposable->on_click, &tags);
tag_set_destroy(&tags);
}
/* Call default implementation, which will execute our handler */
exposable_default_on_mouse(exposable, bar, event, x, y);
if (event == ON_MOUSE_CLICK) {
/* Reset handler string */
free(exposable->on_click);
exposable->on_click = original;
}
}
static struct exposable *
instantiate(const struct particle *particle, const struct tag_set *tags)
{
const struct private *p = particle->private;
const struct tag *tag = tag_for_name(tags, p->tag);
assert(tag != NULL);
long value = tag->as_int(tag);
long min = tag->min(tag);
long max = tag->max(tag);
LOG_DBG("%s: value=%ld, min=%ld, max=%ld", tag->name(tag), value, min, max);
long fill_count = max == min ? 0 : p->width * value / (max - min);
long empty_count = p->width - fill_count;
struct eprivate *epriv = calloc(1, sizeof(*epriv));
epriv->count = (
1 + /* Start marker */
fill_count + /* Before current position */
1 + /* Current position indicator */
empty_count + /* After current position */
1); /* End marker */
epriv->exposables = malloc(epriv->count * sizeof(epriv->exposables[0]));
size_t idx = 0;
epriv->exposables[idx++] = p->start_marker->instantiate(p->start_marker, tags);
for (size_t i = 0; i < fill_count; i++)
epriv->exposables[idx++] = p->fill->instantiate(p->fill, tags);
epriv->exposables[idx++] = p->indicator->instantiate(p->indicator, tags);
for (size_t i = 0; i < empty_count; i++)
epriv->exposables[idx++] = p->empty->instantiate(p->empty, tags);
epriv->exposables[idx++] = p->end_marker->instantiate(p->end_marker, tags);
assert(idx == epriv->count);
char *on_click = tags_expand_template(particle->on_click_template, tags);
struct exposable *exposable = exposable_common_new(particle, on_click);
free(on_click);
exposable->private = epriv;
exposable->destroy = &exposable_destroy;
exposable->begin_expose = &begin_expose;
exposable->expose = &expose;
exposable->on_mouse = &on_mouse;
enum tag_realtime_unit rt = tag->realtime(tag);
if (rt == TAG_REALTIME_NONE)
return exposable;
#if 0
long units_per_segment = (max - min) / p->width;
long units_filled = fill_count * (max - min) / p->width;
long units_til_next_segment = units_per_segment - (value - units_filled);
LOG_DBG("tag: %s, value: %ld, "
"units-per-segment: %ld, units-filled: %ld, units-til-next: %ld",
tag->name(tag), value,
units_per_segment, units_filled, units_til_next_segment);
#else
double units_per_segment = (double)(max - min) / p->width;
double units_filled = fill_count * units_per_segment;
double units_til_next_segment = units_per_segment - ((double)value - units_filled);
LOG_DBG("tag: %s, value: %ld, "
"units-per-segment: %f, units-filled: %f, units-til-next: %f",
tag->name(tag), value,
units_per_segment, units_filled, units_til_next_segment);
#endif
if (!tag->refresh_in(tag, units_til_next_segment))
LOG_WARN("failed to schedule update of tag");
return exposable;
}
static struct particle *
progress_bar_new(struct particle *common, const char *tag, int width,
struct particle *start_marker, struct particle *end_marker,
struct particle *fill, struct particle *empty,
struct particle *indicator)
{
struct private *priv = calloc(1, sizeof(*priv));
priv->tag = strdup(tag);
priv->width = width;
priv->start_marker = start_marker;
priv->end_marker = end_marker;
priv->fill = fill;
priv->empty = empty;
priv->indicator = indicator;
common->private = priv;
common->destroy = &particle_destroy;
common->instantiate = &instantiate;
return common;
}
static struct particle *
from_conf(const struct yml_node *node, struct particle *common)
{
const struct yml_node *tag = yml_get_value(node, "tag");
const struct yml_node *length = yml_get_value(node, "length");
const struct yml_node *start = yml_get_value(node, "start");
const struct yml_node *end = yml_get_value(node, "end");
const struct yml_node *fill = yml_get_value(node, "fill");
const struct yml_node *empty = yml_get_value(node, "empty");
const struct yml_node *indicator = yml_get_value(node, "indicator");
struct conf_inherit inherited = {
.font = common->font,
.foreground = common->foreground,
};
return progress_bar_new(
common,
yml_value_as_string(tag),
yml_value_as_int(length),
conf_to_particle(start, inherited),
conf_to_particle(end, inherited),
conf_to_particle(fill, inherited),
conf_to_particle(empty, inherited),
conf_to_particle(indicator, inherited));
}
static bool
verify_conf(keychain_t *chain, const struct yml_node *node)
{
static const struct attr_info attrs[] = {
{"tag", true, &conf_verify_string},
{"length", true, &conf_verify_int},
/* TODO: make these optional? Default to empty */
{"start", true, &conf_verify_particle},
{"end", true, &conf_verify_particle},
{"fill", true, &conf_verify_particle},
{"empty", true, &conf_verify_particle},
{"indicator", true, &conf_verify_particle},
PARTICLE_COMMON_ATTRS,
};
return conf_verify_dict(chain, node, attrs);
}
const struct particle_iface particle_progress_bar_iface = {
.verify_conf = &verify_conf,
.from_conf = &from_conf,
};
#if defined(CORE_PLUGINS_AS_SHARED_LIBRARIES)
extern const struct particle_iface iface __attribute__((weak, alias("particle_progress_bar_iface")));
#endif