if (!Control) var Control = {}; Control.Slider = Class.create({ initialize: function(handle, track, options) {
    var slider = this; if (Object.isArray(handle)) { this.handles = handle.collect(function(e) { return $(e) }); } else { this.handles = [$(handle)]; }
    this.track = $(track); this.options = options || {}; this.axis = this.options.axis || 'horizontal'; this.increment = this.options.increment || 1; this.step = parseInt(this.options.step || '1'); this.range = this.options.range || $R(0, 1); this.value = 0; this.values = this.handles.map(function() { return 0 }); this.spans = this.options.spans ? this.options.spans.map(function(s) { return $(s) }) : false; this.options.startSpan = $(this.options.startSpan || null); this.options.endSpan = $(this.options.endSpan || null); this.restricted = this.options.restricted || false; this.maximum = this.options.maximum || this.range.end; this.minimum = this.options.minimum || this.range.start; this.alignX = parseInt(this.options.alignX || '0'); this.alignY = parseInt(this.options.alignY || '0'); this.trackLength = this.maximumOffset() - this.minimumOffset(); this.handleLength = this.isVertical() ? (this.handles[0].offsetHeight != 0 ? this.handles[0].offsetHeight : this.handles[0].style.height.replace(/px$/, "")) : (this.handles[0].offsetWidth != 0 ? this.handles[0].offsetWidth : this.handles[0].style.width.replace(/px$/, "")); this.active = false; this.dragging = false; this.disabled = false; if (this.options.disabled) this.setDisabled(); this.allowedValues = this.options.values ? this.options.values.sortBy(Prototype.K) : false; if (this.allowedValues) { this.minimum = this.allowedValues.min(); this.maximum = this.allowedValues.max(); }
    this.eventMouseDown = this.startDrag.bindAsEventListener(this); this.eventMouseUp = this.endDrag.bindAsEventListener(this); this.eventMouseMove = this.update.bindAsEventListener(this); this.handles.each(function(h, i) { i = slider.handles.length - 1 - i; slider.setValue(parseFloat((Object.isArray(slider.options.sliderValue) ? slider.options.sliderValue[i] : slider.options.sliderValue) || slider.range.start), i); h.makePositioned().observe("mousedown", slider.eventMouseDown); }); this.track.observe("mousedown", this.eventMouseDown); document.observe("mouseup", this.eventMouseUp); document.observe("mousemove", this.eventMouseMove); this.initialized = true;
}, dispose: function() { var slider = this; Event.stopObserving(this.track, "mousedown", this.eventMouseDown); Event.stopObserving(document, "mouseup", this.eventMouseUp); Event.stopObserving(document, "mousemove", this.eventMouseMove); this.handles.each(function(h) { Event.stopObserving(h, "mousedown", slider.eventMouseDown); }); }, setDisabled: function() { this.disabled = true; }, setEnabled: function() { this.disabled = false; }, getNearestValue: function(value) {
    if (this.allowedValues) { if (value >= this.allowedValues.max()) return (this.allowedValues.max()); if (value <= this.allowedValues.min()) return (this.allowedValues.min()); var offset = Math.abs(this.allowedValues[0] - value); var newValue = this.allowedValues[0]; this.allowedValues.each(function(v) { var currentOffset = Math.abs(v - value); if (currentOffset <= offset) { newValue = v; offset = currentOffset; } }); return newValue; }
    if (value > this.range.end) return this.range.end; if (value < this.range.start) return this.range.start; return value;
}, setValue: function(sliderValue, handleIdx) {
    if (!this.active) { this.activeHandleIdx = handleIdx || 0; this.activeHandle = this.handles[this.activeHandleIdx]; this.updateStyles(); }
    handleIdx = handleIdx || this.activeHandleIdx || 0; if (this.initialized && this.restricted) {
        if ((handleIdx > 0) && (sliderValue < this.values[handleIdx - 1]))
            sliderValue = this.values[handleIdx - 1]; if ((handleIdx < (this.handles.length - 1)) && (sliderValue > this.values[handleIdx + 1]))
            sliderValue = this.values[handleIdx + 1];
    }
    sliderValue = this.getNearestValue(sliderValue); this.values[handleIdx] = sliderValue; this.value = this.values[0]; this.handles[handleIdx].style[this.isVertical() ? 'top' : 'left'] = this.translateToPx(sliderValue); this.drawSpans(); if (!this.dragging || !this.event) this.updateFinished();
}, setValueBy: function(delta, handleIdx) { this.setValue(this.values[handleIdx || this.activeHandleIdx || 0] + delta, handleIdx || this.activeHandleIdx || 0); }, translateToPx: function(value) { return Math.round(((this.trackLength - this.handleLength) / (this.range.end - this.range.start)) * (value - this.range.start)) + "px"; }, translateToValue: function(offset) { return ((offset / (this.trackLength - this.handleLength) * (this.range.end - this.range.start)) + this.range.start); }, getRange: function(range) { var v = this.values.sortBy(Prototype.K); range = range || 0; return $R(v[range], v[range + 1]); }, minimumOffset: function() { return (this.isVertical() ? this.alignY : this.alignX); }, maximumOffset: function() { return (this.isVertical() ? (this.track.offsetHeight != 0 ? this.track.offsetHeight : this.track.style.height.replace(/px$/, "")) - this.alignY : (this.track.offsetWidth != 0 ? this.track.offsetWidth : this.track.style.width.replace(/px$/, "")) - this.alignX); }, isVertical: function() { return (this.axis == 'vertical'); }, drawSpans: function() {
    var slider = this; if (this.spans)
        $R(0, this.spans.length - 1).each(function(r) { slider.setSpan(slider.spans[r], slider.getRange(r)) }); if (this.options.startSpan)
        this.setSpan(this.options.startSpan, $R(0, this.values.length > 1 ? this.getRange(0).min() : this.value)); if (this.options.endSpan)
        this.setSpan(this.options.endSpan, $R(this.values.length > 1 ? this.getRange(this.spans.length - 1).max() : this.value, this.maximum));
}, setSpan: function(span, range) { if (this.isVertical()) { span.style.top = this.translateToPx(range.start); span.style.height = this.translateToPx(range.end - range.start + this.range.start); } else { span.style.left = this.translateToPx(range.start); span.style.width = this.translateToPx(range.end - range.start + this.range.start); } }, updateStyles: function() { this.handles.each(function(h) { Element.removeClassName(h, 'selected') }); Element.addClassName(this.activeHandle, 'selected'); }, startDrag: function(event) {
    if (Event.isLeftClick(event)) {
        if (!this.disabled) {
            this.active = true; var handle = Event.element(event); var pointer = [Event.pointerX(event), Event.pointerY(event)]; var track = handle; if (track == this.track) { var offsets = Position.cumulativeOffset(this.track); this.event = event; this.setValue(this.translateToValue((this.isVertical() ? pointer[1] - offsets[1] : pointer[0] - offsets[0]) - (this.handleLength / 2))); var offsets = Position.cumulativeOffset(this.activeHandle); this.offsetX = (pointer[0] - offsets[0]); this.offsetY = (pointer[1] - offsets[1]); } else {
                while ((this.handles.indexOf(handle) == -1) && handle.parentNode)
                    handle = handle.parentNode; if (this.handles.indexOf(handle) != -1) { this.activeHandle = handle; this.activeHandleIdx = this.handles.indexOf(this.activeHandle); this.updateStyles(); var offsets = Position.cumulativeOffset(this.activeHandle); this.offsetX = (pointer[0] - offsets[0]); this.offsetY = (pointer[1] - offsets[1]); } 
            } 
        }
        Event.stop(event);
    } 
}, update: function(event) { if (this.active) { if (!this.dragging) this.dragging = true; this.draw(event); if (Prototype.Browser.WebKit) window.scrollBy(0, 0); Event.stop(event); } }, draw: function(event) {
    var pointer = [Event.pointerX(event), Event.pointerY(event)]; var offsets = Position.cumulativeOffset(this.track); pointer[0] -= this.offsetX + offsets[0]; pointer[1] -= this.offsetY + offsets[1]; this.event = event; this.setValue(this.translateToValue(this.isVertical() ? pointer[1] : pointer[0])); if (this.initialized && this.options.onSlide)
        this.options.onSlide(this.values.length > 1 ? this.values : this.value, this);
}, endDrag: function(event) {
    if (this.active && this.dragging) { this.finishDrag(event, true); Event.stop(event); }
    this.active = false; this.dragging = false;
}, finishDrag: function(event, success) { this.active = false; this.dragging = false; this.updateFinished(); }, updateFinished: function() {
    if (this.initialized && this.options.onChange)
        this.options.onChange(this.values.length > 1 ? this.values : this.value, this); this.event = null;
} 
});