michael@0: // script.aculo.us slider.js v1.7.1_beta2, Tue May 15 15:15:45 EDT 2007
michael@0: 
michael@0: // Copyright (c) 2005-2007 Marty Haught, Thomas Fuchs 
michael@0: //
michael@0: // script.aculo.us is freely distributable under the terms of an MIT-style license.
michael@0: // For details, see the script.aculo.us web site: http://script.aculo.us/
michael@0: 
michael@0: if(!Control) var Control = {};
michael@0: Control.Slider = Class.create();
michael@0: 
michael@0: // options:
michael@0: //  axis: 'vertical', or 'horizontal' (default)
michael@0: //
michael@0: // callbacks:
michael@0: //  onChange(value)
michael@0: //  onSlide(value)
michael@0: Control.Slider.prototype = {
michael@0:   initialize: function(handle, track, options) {
michael@0:     var slider = this;
michael@0:     
michael@0:     if(handle instanceof Array) {
michael@0:       this.handles = handle.collect( function(e) { return $(e) });
michael@0:     } else {
michael@0:       this.handles = [$(handle)];
michael@0:     }
michael@0:     
michael@0:     this.track   = $(track);
michael@0:     this.options = options || {};
michael@0: 
michael@0:     this.axis      = this.options.axis || 'horizontal';
michael@0:     this.increment = this.options.increment || 1;
michael@0:     this.step      = parseInt(this.options.step || '1');
michael@0:     this.range     = this.options.range || $R(0,1);
michael@0:     
michael@0:     this.value     = 0; // assure backwards compat
michael@0:     this.values    = this.handles.map( function() { return 0 });
michael@0:     this.spans     = this.options.spans ? this.options.spans.map(function(s){ return $(s) }) : false;
michael@0:     this.options.startSpan = $(this.options.startSpan || null);
michael@0:     this.options.endSpan   = $(this.options.endSpan || null);
michael@0: 
michael@0:     this.restricted = this.options.restricted || false;
michael@0: 
michael@0:     this.maximum   = this.options.maximum || this.range.end;
michael@0:     this.minimum   = this.options.minimum || this.range.start;
michael@0: 
michael@0:     // Will be used to align the handle onto the track, if necessary
michael@0:     this.alignX = parseInt(this.options.alignX || '0');
michael@0:     this.alignY = parseInt(this.options.alignY || '0');
michael@0:     
michael@0:     this.trackLength = this.maximumOffset() - this.minimumOffset();
michael@0: 
michael@0:     this.handleLength = this.isVertical() ? 
michael@0:       (this.handles[0].offsetHeight != 0 ? 
michael@0:         this.handles[0].offsetHeight : this.handles[0].style.height.replace(/px$/,"")) : 
michael@0:       (this.handles[0].offsetWidth != 0 ? this.handles[0].offsetWidth : 
michael@0:         this.handles[0].style.width.replace(/px$/,""));
michael@0: 
michael@0:     this.active   = false;
michael@0:     this.dragging = false;
michael@0:     this.disabled = false;
michael@0: 
michael@0:     if(this.options.disabled) this.setDisabled();
michael@0: 
michael@0:     // Allowed values array
michael@0:     this.allowedValues = this.options.values ? this.options.values.sortBy(Prototype.K) : false;
michael@0:     if(this.allowedValues) {
michael@0:       this.minimum = this.allowedValues.min();
michael@0:       this.maximum = this.allowedValues.max();
michael@0:     }
michael@0: 
michael@0:     this.eventMouseDown = this.startDrag.bindAsEventListener(this);
michael@0:     this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
michael@0:     this.eventMouseMove = this.update.bindAsEventListener(this);
michael@0: 
michael@0:     // Initialize handles in reverse (make sure first handle is active)
michael@0:     this.handles.each( function(h,i) {
michael@0:       i = slider.handles.length-1-i;
michael@0:       slider.setValue(parseFloat(
michael@0:         (slider.options.sliderValue instanceof Array ? 
michael@0:           slider.options.sliderValue[i] : slider.options.sliderValue) || 
michael@0:          slider.range.start), i);
michael@0:       Element.makePositioned(h); // fix IE
michael@0:       Event.observe(h, "mousedown", slider.eventMouseDown);
michael@0:     });
michael@0:     
michael@0:     Event.observe(this.track, "mousedown", this.eventMouseDown);
michael@0:     Event.observe(document, "mouseup", this.eventMouseUp);
michael@0:     Event.observe(document, "mousemove", this.eventMouseMove);
michael@0:     
michael@0:     this.initialized = true;
michael@0:   },
michael@0:   dispose: function() {
michael@0:     var slider = this;    
michael@0:     Event.stopObserving(this.track, "mousedown", this.eventMouseDown);
michael@0:     Event.stopObserving(document, "mouseup", this.eventMouseUp);
michael@0:     Event.stopObserving(document, "mousemove", this.eventMouseMove);
michael@0:     this.handles.each( function(h) {
michael@0:       Event.stopObserving(h, "mousedown", slider.eventMouseDown);
michael@0:     });
michael@0:   },
michael@0:   setDisabled: function(){
michael@0:     this.disabled = true;
michael@0:   },
michael@0:   setEnabled: function(){
michael@0:     this.disabled = false;
michael@0:   },  
michael@0:   getNearestValue: function(value){
michael@0:     if(this.allowedValues){
michael@0:       if(value >= this.allowedValues.max()) return(this.allowedValues.max());
michael@0:       if(value <= this.allowedValues.min()) return(this.allowedValues.min());
michael@0:       
michael@0:       var offset = Math.abs(this.allowedValues[0] - value);
michael@0:       var newValue = this.allowedValues[0];
michael@0:       this.allowedValues.each( function(v) {
michael@0:         var currentOffset = Math.abs(v - value);
michael@0:         if(currentOffset <= offset){
michael@0:           newValue = v;
michael@0:           offset = currentOffset;
michael@0:         } 
michael@0:       });
michael@0:       return newValue;
michael@0:     }
michael@0:     if(value > this.range.end) return this.range.end;
michael@0:     if(value < this.range.start) return this.range.start;
michael@0:     return value;
michael@0:   },
michael@0:   setValue: function(sliderValue, handleIdx){
michael@0:     if(!this.active) {
michael@0:       this.activeHandleIdx = handleIdx || 0;
michael@0:       this.activeHandle    = this.handles[this.activeHandleIdx];
michael@0:       this.updateStyles();
michael@0:     }
michael@0:     handleIdx = handleIdx || this.activeHandleIdx || 0;
michael@0:     if(this.initialized && this.restricted) {
michael@0:       if((handleIdx>0) && (sliderValue<this.values[handleIdx-1]))
michael@0:         sliderValue = this.values[handleIdx-1];
michael@0:       if((handleIdx < (this.handles.length-1)) && (sliderValue>this.values[handleIdx+1]))
michael@0:         sliderValue = this.values[handleIdx+1];
michael@0:     }
michael@0:     sliderValue = this.getNearestValue(sliderValue);
michael@0:     this.values[handleIdx] = sliderValue;
michael@0:     this.value = this.values[0]; // assure backwards compat
michael@0:     
michael@0:     this.handles[handleIdx].style[this.isVertical() ? 'top' : 'left'] = 
michael@0:       this.translateToPx(sliderValue);
michael@0:     
michael@0:     this.drawSpans();
michael@0:     if(!this.dragging || !this.event) this.updateFinished();
michael@0:   },
michael@0:   setValueBy: function(delta, handleIdx) {
michael@0:     this.setValue(this.values[handleIdx || this.activeHandleIdx || 0] + delta, 
michael@0:       handleIdx || this.activeHandleIdx || 0);
michael@0:   },
michael@0:   translateToPx: function(value) {
michael@0:     return Math.round(
michael@0:       ((this.trackLength-this.handleLength)/(this.range.end-this.range.start)) * 
michael@0:       (value - this.range.start)) + "px";
michael@0:   },
michael@0:   translateToValue: function(offset) {
michael@0:     return ((offset/(this.trackLength-this.handleLength) * 
michael@0:       (this.range.end-this.range.start)) + this.range.start);
michael@0:   },
michael@0:   getRange: function(range) {
michael@0:     var v = this.values.sortBy(Prototype.K); 
michael@0:     range = range || 0;
michael@0:     return $R(v[range],v[range+1]);
michael@0:   },
michael@0:   minimumOffset: function(){
michael@0:     return(this.isVertical() ? this.alignY : this.alignX);
michael@0:   },
michael@0:   maximumOffset: function(){
michael@0:     return(this.isVertical() ? 
michael@0:       (this.track.offsetHeight != 0 ? this.track.offsetHeight :
michael@0:         this.track.style.height.replace(/px$/,"")) - this.alignY : 
michael@0:       (this.track.offsetWidth != 0 ? this.track.offsetWidth : 
michael@0:         this.track.style.width.replace(/px$/,"")) - this.alignY);
michael@0:   },  
michael@0:   isVertical:  function(){
michael@0:     return (this.axis == 'vertical');
michael@0:   },
michael@0:   drawSpans: function() {
michael@0:     var slider = this;
michael@0:     if(this.spans)
michael@0:       $R(0, this.spans.length-1).each(function(r) { slider.setSpan(slider.spans[r], slider.getRange(r)) });
michael@0:     if(this.options.startSpan)
michael@0:       this.setSpan(this.options.startSpan,
michael@0:         $R(0, this.values.length>1 ? this.getRange(0).min() : this.value ));
michael@0:     if(this.options.endSpan)
michael@0:       this.setSpan(this.options.endSpan, 
michael@0:         $R(this.values.length>1 ? this.getRange(this.spans.length-1).max() : this.value, this.maximum));
michael@0:   },
michael@0:   setSpan: function(span, range) {
michael@0:     if(this.isVertical()) {
michael@0:       span.style.top = this.translateToPx(range.start);
michael@0:       span.style.height = this.translateToPx(range.end - range.start + this.range.start);
michael@0:     } else {
michael@0:       span.style.left = this.translateToPx(range.start);
michael@0:       span.style.width = this.translateToPx(range.end - range.start + this.range.start);
michael@0:     }
michael@0:   },
michael@0:   updateStyles: function() {
michael@0:     this.handles.each( function(h){ Element.removeClassName(h, 'selected') });
michael@0:     Element.addClassName(this.activeHandle, 'selected');
michael@0:   },
michael@0:   startDrag: function(event) {
michael@0:     if(Event.isLeftClick(event)) {
michael@0:       if(!this.disabled){
michael@0:         this.active = true;
michael@0:         
michael@0:         var handle = Event.element(event);
michael@0:         var pointer  = [Event.pointerX(event), Event.pointerY(event)];
michael@0:         var track = handle;
michael@0:         if(track==this.track) {
michael@0:           var offsets  = Position.cumulativeOffset(this.track); 
michael@0:           this.event = event;
michael@0:           this.setValue(this.translateToValue( 
michael@0:            (this.isVertical() ? pointer[1]-offsets[1] : pointer[0]-offsets[0])-(this.handleLength/2)
michael@0:           ));
michael@0:           var offsets  = Position.cumulativeOffset(this.activeHandle);
michael@0:           this.offsetX = (pointer[0] - offsets[0]);
michael@0:           this.offsetY = (pointer[1] - offsets[1]);
michael@0:         } else {
michael@0:           // find the handle (prevents issues with Safari)
michael@0:           while((this.handles.indexOf(handle) == -1) && handle.parentNode) 
michael@0:             handle = handle.parentNode;
michael@0:             
michael@0:           if(this.handles.indexOf(handle)!=-1) {
michael@0:             this.activeHandle    = handle;
michael@0:             this.activeHandleIdx = this.handles.indexOf(this.activeHandle);
michael@0:             this.updateStyles();
michael@0:             
michael@0:             var offsets  = Position.cumulativeOffset(this.activeHandle);
michael@0:             this.offsetX = (pointer[0] - offsets[0]);
michael@0:             this.offsetY = (pointer[1] - offsets[1]);
michael@0:           }
michael@0:         }
michael@0:       }
michael@0:       Event.stop(event);
michael@0:     }
michael@0:   },
michael@0:   update: function(event) {
michael@0:    if(this.active) {
michael@0:       if(!this.dragging) this.dragging = true;
michael@0:       this.draw(event);
michael@0:       if(Prototype.Browser.WebKit) window.scrollBy(0,0);
michael@0:       Event.stop(event);
michael@0:    }
michael@0:   },
michael@0:   draw: function(event) {
michael@0:     var pointer = [Event.pointerX(event), Event.pointerY(event)];
michael@0:     var offsets = Position.cumulativeOffset(this.track);
michael@0:     pointer[0] -= this.offsetX + offsets[0];
michael@0:     pointer[1] -= this.offsetY + offsets[1];
michael@0:     this.event = event;
michael@0:     this.setValue(this.translateToValue( this.isVertical() ? pointer[1] : pointer[0] ));
michael@0:     if(this.initialized && this.options.onSlide)
michael@0:       this.options.onSlide(this.values.length>1 ? this.values : this.value, this);
michael@0:   },
michael@0:   endDrag: function(event) {
michael@0:     if(this.active && this.dragging) {
michael@0:       this.finishDrag(event, true);
michael@0:       Event.stop(event);
michael@0:     }
michael@0:     this.active = false;
michael@0:     this.dragging = false;
michael@0:   },  
michael@0:   finishDrag: function(event, success) {
michael@0:     this.active = false;
michael@0:     this.dragging = false;
michael@0:     this.updateFinished();
michael@0:   },
michael@0:   updateFinished: function() {
michael@0:     if(this.initialized && this.options.onChange) 
michael@0:       this.options.onChange(this.values.length>1 ? this.values : this.value, this);
michael@0:     this.event = null;
michael@0:   }
michael@0: }