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Copy pathtimer.js
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85 lines (76 loc) · 2.35 KB
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import "../core/document";
import "../core/vendor";
var d3_timer_queueHead,
d3_timer_queueTail,
d3_timer_interval, // is an interval (or frame) active?
d3_timer_timeout, // is a timeout active?
d3_timer_active, // active timer object
d3_timer_frame = d3_window[d3_vendorSymbol(d3_window, "requestAnimationFrame")] || function(callback) { setTimeout(callback, 17); };
// The timer will continue to fire until callback returns true.
d3.timer = function(callback, delay, then) {
var n = arguments.length;
if (n < 2) delay = 0;
if (n < 3) then = Date.now();
// Add the callback to the tail of the queue.
var time = then + delay, timer = {callback: callback, time: time, next: null};
if (d3_timer_queueTail) d3_timer_queueTail.next = timer;
else d3_timer_queueHead = timer;
d3_timer_queueTail = timer;
// Start animatin'!
if (!d3_timer_interval) {
d3_timer_timeout = clearTimeout(d3_timer_timeout);
d3_timer_interval = 1;
d3_timer_frame(d3_timer_step);
}
};
function d3_timer_step() {
var now = d3_timer_mark(),
delay = d3_timer_sweep() - now;
if (delay > 24) {
if (isFinite(delay)) {
clearTimeout(d3_timer_timeout);
d3_timer_timeout = setTimeout(d3_timer_step, delay);
}
d3_timer_interval = 0;
} else {
d3_timer_interval = 1;
d3_timer_frame(d3_timer_step);
}
}
d3.timer.flush = function() {
d3_timer_mark();
d3_timer_sweep();
};
function d3_timer_replace(callback, delay, then) {
var n = arguments.length;
if (n < 2) delay = 0;
if (n < 3) then = Date.now();
d3_timer_active.callback = callback;
d3_timer_active.time = then + delay;
}
function d3_timer_mark() {
var now = Date.now();
d3_timer_active = d3_timer_queueHead;
while (d3_timer_active) {
if (now >= d3_timer_active.time) d3_timer_active.flush = d3_timer_active.callback(now - d3_timer_active.time);
d3_timer_active = d3_timer_active.next;
}
return now;
}
// Flush after callbacks to avoid concurrent queue modification.
// Returns the time of the earliest active timer, post-sweep.
function d3_timer_sweep() {
var t0,
t1 = d3_timer_queueHead,
time = Infinity;
while (t1) {
if (t1.flush) {
t1 = t0 ? t0.next = t1.next : d3_timer_queueHead = t1.next;
} else {
if (t1.time < time) time = t1.time;
t1 = (t0 = t1).next;
}
}
d3_timer_queueTail = t0;
return time;
}