User:Ganiman/slider.js

// script.aculo.us slider.js v1.8.1, Thu Jan 03 22:07:12 -0500 2008

// Copyright (c) 2005-2007 Marty Haught, Thomas Fuchs // // script.aculo.us is freely distributable under the terms of an MIT-style license. // For details, see the script.aculo.us web site: http://script.aculo.us/

if (!Control) var Control = { };

// options: // axis: 'vertical', or 'horizontal' (default) // // callbacks: // onChange(value) // onSlide(value) 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; // assure backwards compat 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;

// Will be used to align the handle onto the track, if necessary 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;

// Allowed values array 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);

// Initialize handles in reverse (make sure first handle is active) 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) && (sliderValuethis.values[handleIdx+1])) sliderValue = this.values[handleIdx+1]; }   sliderValue = this.getNearestValue(sliderValue); this.values[handleIdx] = sliderValue; this.value = this.values[0]; // assure backwards compat 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 { // find the handle (prevents issues with Safari) 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; } });