61 lines
1.9 KiB
JavaScript
61 lines
1.9 KiB
JavaScript
function FrequencyDisplay(element) {
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this.element = $(element);
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this.digits = [];
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this.digitContainer = $('<span>');
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this.element.html([this.digitContainer, $('<span> MHz</span>')]);
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this.decimalSeparator = (0.1).toLocaleString().substring(1, 2);
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this.setFrequency(0);
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}
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FrequencyDisplay.prototype.setFrequency = function(freq) {
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this.frequency = freq;
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var formatted = (freq / 1e6).toLocaleString(undefined, {maximumFractionDigits: 4, minimumFractionDigits: 4});
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var children = this.digitContainer.children();
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for (var i = 0; i < formatted.length; i++) {
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if (!this.digits[i]) {
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this.digits[i] = $('<span>');
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var before = children[i];
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if (before) {
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$(before).after(this.digits[i]);
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} else {
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this.digitContainer.append(this.digits[i]);
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}
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}
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this.digits[i][(isNaN(formatted[i]) ? 'remove' : 'add') + 'Class']('digit');
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this.digits[i].html(formatted[i]);
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}
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while (this.digits.length > formatted.length) {
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this.digits.pop().remove();
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}
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};
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function TuneableFrequencyDisplay(element) {
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FrequencyDisplay.call(this, element);
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this.setupEvents();
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}
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TuneableFrequencyDisplay.prototype = new FrequencyDisplay();
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TuneableFrequencyDisplay.prototype.setupEvents = function() {
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var me = this;
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this.element.on('wheel', function(e){
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e.preventDefault();
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e.stopPropagation();
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var index = me.digitContainer.find('.digit').index(e.target);
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if (index < 0) return;
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var delta = 10 ** (Math.floor(Math.log10(me.frequency)) - index);
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if (e.originalEvent.deltaY > 0) delta *= -1;
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var newFrequency = me.frequency + delta;
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me.listeners.forEach(function(l) {
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l(newFrequency);
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});
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});
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this.listeners = [];
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};
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TuneableFrequencyDisplay.prototype.onFrequencyChange = function(listener){
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this.listeners.push(listener);
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}; |