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e7b2eb4 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 | 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_frame = this[d3_vendorSymbol(this, "requestAnimationFrame")] || function(callback) { setTimeout(callback, 17); };
// The timer will continue to fire until callback returns true.
d3.timer = function() {
d3_timer.apply(this, arguments);
};
function d3_timer(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 = {c: callback, t: time, n: null};
if (d3_timer_queueTail) d3_timer_queueTail.n = 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);
}
return timer;
}
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_mark() {
var now = Date.now(),
timer = d3_timer_queueHead;
while (timer) {
if (now >= timer.t && timer.c(now - timer.t)) timer.c = null;
timer = timer.n;
}
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.c) {
if (t1.t < time) time = t1.t;
t1 = (t0 = t1).n;
} else {
t1 = t0 ? t0.n = t1.n : d3_timer_queueHead = t1.n;
}
}
d3_timer_queueTail = t0;
return time;
}
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