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Timer control
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<!DOCTYPE html> | |
<html> | |
<meta charset="utf-8"> | |
<meta name="viewport" content="width=device-width, initial-scale=1"> | |
<body> | |
<button class="play">Play</button> | |
<button class="pause">Pause</button> | |
<button class="reset">Reset</button> | |
</body> | |
<script src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script> | |
<script> | |
var time = d3.select('body').append('h1'); | |
var timeTimer = new TimerControl(function(t) { time.text(t); }); | |
d3.select('.play').on('click', timeTimer.play); | |
d3.select('.pause').on('click', timeTimer.pause); | |
d3.select('.reset').on('click', timeTimer.reset); | |
// `fn` will be called with context `context` if supplied (optional) | |
function TimerControl(fn, context) { | |
var epoch = 0; | |
var running = false; | |
// initialize, effectively | |
fn.call(context || this, epoch); | |
this.play = function() { | |
if(running) return; | |
running = true; | |
d3.timer(function(t) { | |
fn.call(context || this, epoch + t); | |
if (!running) { | |
epoch += t; | |
return true; | |
} | |
return false; | |
}) | |
} | |
this.pause = function() { | |
running = false; | |
} | |
this.reset = function() { | |
epoch = 0; | |
fn.call(context || this, epoch); | |
} | |
} | |
</script> | |
</html> |
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