1// script.aculo.us slider.js v1.7.0, Fri Jan 19 19:16:36 CET 2007
2
3// Copyright (c) 2005, 2006 Marty Haught, Thomas Fuchs
4//
5// script.aculo.us is freely distributable under the terms of an MIT-style license.
6// For details, see the script.aculo.us web site: http://script.aculo.us/
7
8if(!Control) var Control = {};
9Control.Slider = Class.create();
10
11// options:
12//  axis: 'vertical', or 'horizontal' (default)
13//
14// callbacks:
15//  onChange(value)
16//  onSlide(value)
17Control.Slider.prototype = {
18  initialize: function(handle, track, options) {
19    var slider = this;
20
21    if(handle instanceof Array) {
22      this.handles = handle.collect( function(e) { return $(e) });
23    } else {
24      this.handles = [$(handle)];
25    }
26
27    this.track   = $(track);
28    this.options = options || {};
29
30    this.axis      = this.options.axis || 'horizontal';
31    this.increment = this.options.increment || 1;
32    this.step      = parseInt(this.options.step || '1');
33    this.range     = this.options.range || $R(0,1);
34
35    this.value     = 0; // assure backwards compat
36    this.values    = this.handles.map( function() { return 0 });
37    this.spans     = this.options.spans ? this.options.spans.map(function(s){ return $(s) }) : false;
38    this.options.startSpan = $(this.options.startSpan || null);
39    this.options.endSpan   = $(this.options.endSpan || null);
40
41    this.restricted = this.options.restricted || false;
42
43    this.maximum   = this.options.maximum || this.range.end;
44    this.minimum   = this.options.minimum || this.range.start;
45
46    // Will be used to align the handle onto the track, if necessary
47    this.alignX = parseInt(this.options.alignX || '0');
48    this.alignY = parseInt(this.options.alignY || '0');
49
50    this.trackLength = this.maximumOffset() - this.minimumOffset();
51
52    this.handleLength = this.isVertical() ?
53      (this.handles[0].offsetHeight != 0 ?
54        this.handles[0].offsetHeight : this.handles[0].style.height.replace(/px$/,"")) :
55      (this.handles[0].offsetWidth != 0 ? this.handles[0].offsetWidth :
56        this.handles[0].style.width.replace(/px$/,""));
57
58    this.active   = false;
59    this.dragging = false;
60    this.disabled = false;
61
62    if(this.options.disabled) this.setDisabled();
63
64    // Allowed values array
65    this.allowedValues = this.options.values ? this.options.values.sortBy(Prototype.K) : false;
66    if(this.allowedValues) {
67      this.minimum = this.allowedValues.min();
68      this.maximum = this.allowedValues.max();
69    }
70
71    this.eventMouseDown = this.startDrag.bindAsEventListener(this);
72    this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
73    this.eventMouseMove = this.update.bindAsEventListener(this);
74
75    // Initialize handles in reverse (make sure first handle is active)
76    this.handles.each( function(h,i) {
77      i = slider.handles.length-1-i;
78      slider.setValue(parseFloat(
79        (slider.options.sliderValue instanceof Array ?
80          slider.options.sliderValue[i] : slider.options.sliderValue) ||
81         slider.range.start), i);
82      Element.makePositioned(h); // fix IE
83      Event.observe(h, "mousedown", slider.eventMouseDown);
84    });
85
86    Event.observe(this.track, "mousedown", this.eventMouseDown);
87    Event.observe(document, "mouseup", this.eventMouseUp);
88    Event.observe(document, "mousemove", this.eventMouseMove);
89
90    this.initialized = true;
91  },
92  dispose: function() {
93    var slider = this;
94    Event.stopObserving(this.track, "mousedown", this.eventMouseDown);
95    Event.stopObserving(document, "mouseup", this.eventMouseUp);
96    Event.stopObserving(document, "mousemove", this.eventMouseMove);
97    this.handles.each( function(h) {
98      Event.stopObserving(h, "mousedown", slider.eventMouseDown);
99    });
100  },
101  setDisabled: function(){
102    this.disabled = true;
103  },
104  setEnabled: function(){
105    this.disabled = false;
106  },
107  getNearestValue: function(value){
108    if(this.allowedValues){
109      if(value >= this.allowedValues.max()) return(this.allowedValues.max());
110      if(value <= this.allowedValues.min()) return(this.allowedValues.min());
111
112      var offset = Math.abs(this.allowedValues[0] - value);
113      var newValue = this.allowedValues[0];
114      this.allowedValues.each( function(v) {
115        var currentOffset = Math.abs(v - value);
116        if(currentOffset <= offset){
117          newValue = v;
118          offset = currentOffset;
119        }
120      });
121      return newValue;
122    }
123    if(value > this.range.end) return this.range.end;
124    if(value < this.range.start) return this.range.start;
125    return value;
126  },
127  setValue: function(sliderValue, handleIdx){
128    if(!this.active) {
129      this.activeHandleIdx = handleIdx || 0;
130      this.activeHandle    = this.handles[this.activeHandleIdx];
131      this.updateStyles();
132    }
133    handleIdx = handleIdx || this.activeHandleIdx || 0;
134    if(this.initialized && this.restricted) {
135      if((handleIdx>0) && (sliderValue<this.values[handleIdx-1]))
136        sliderValue = this.values[handleIdx-1];
137      if((handleIdx < (this.handles.length-1)) && (sliderValue>this.values[handleIdx+1]))
138        sliderValue = this.values[handleIdx+1];
139    }
140    sliderValue = this.getNearestValue(sliderValue);
141    this.values[handleIdx] = sliderValue;
142    this.value = this.values[0]; // assure backwards compat
143
144    this.handles[handleIdx].style[this.isVertical() ? 'top' : 'left'] =
145      this.translateToPx(sliderValue);
146
147    this.drawSpans();
148    if(!this.dragging || !this.event) this.updateFinished();
149  },
150  setValueBy: function(delta, handleIdx) {
151    this.setValue(this.values[handleIdx || this.activeHandleIdx || 0] + delta,
152      handleIdx || this.activeHandleIdx || 0);
153  },
154  translateToPx: function(value) {
155    return Math.round(
156      ((this.trackLength-this.handleLength)/(this.range.end-this.range.start)) *
157      (value - this.range.start)) + "px";
158  },
159  translateToValue: function(offset) {
160    return ((offset/(this.trackLength-this.handleLength) *
161      (this.range.end-this.range.start)) + this.range.start);
162  },
163  getRange: function(range) {
164    var v = this.values.sortBy(Prototype.K);
165    range = range || 0;
166    return $R(v[range],v[range+1]);
167  },
168  minimumOffset: function(){
169    return(this.isVertical() ? this.alignY : this.alignX);
170  },
171  maximumOffset: function(){
172    return(this.isVertical() ?
173      (this.track.offsetHeight != 0 ? this.track.offsetHeight :
174        this.track.style.height.replace(/px$/,"")) - this.alignY :
175      (this.track.offsetWidth != 0 ? this.track.offsetWidth :
176        this.track.style.width.replace(/px$/,"")) - this.alignY);
177  },
178  isVertical:  function(){
179    return (this.axis == 'vertical');
180  },
181  drawSpans: function() {
182    var slider = this;
183    if(this.spans)
184      $R(0, this.spans.length-1).each(function(r) { slider.setSpan(slider.spans[r], slider.getRange(r)) });
185    if(this.options.startSpan)
186      this.setSpan(this.options.startSpan,
187        $R(0, this.values.length>1 ? this.getRange(0).min() : this.value ));
188    if(this.options.endSpan)
189      this.setSpan(this.options.endSpan,
190        $R(this.values.length>1 ? this.getRange(this.spans.length-1).max() : this.value, this.maximum));
191  },
192  setSpan: function(span, range) {
193    if(this.isVertical()) {
194      span.style.top = this.translateToPx(range.start);
195      span.style.height = this.translateToPx(range.end - range.start + this.range.start);
196    } else {
197      span.style.left = this.translateToPx(range.start);
198      span.style.width = this.translateToPx(range.end - range.start + this.range.start);
199    }
200  },
201  updateStyles: function() {
202    this.handles.each( function(h){ Element.removeClassName(h, 'selected') });
203    Element.addClassName(this.activeHandle, 'selected');
204  },
205  startDrag: function(event) {
206    if(Event.isLeftClick(event)) {
207      if(!this.disabled){
208        this.active = true;
209
210        var handle = Event.element(event);
211        var pointer  = [Event.pointerX(event), Event.pointerY(event)];
212        var track = handle;
213        if(track==this.track) {
214          var offsets  = Position.cumulativeOffset(this.track);
215          this.event = event;
216          this.setValue(this.translateToValue(
217           (this.isVertical() ? pointer[1]-offsets[1] : pointer[0]-offsets[0])-(this.handleLength/2)
218          ));
219          var offsets  = Position.cumulativeOffset(this.activeHandle);
220          this.offsetX = (pointer[0] - offsets[0]);
221          this.offsetY = (pointer[1] - offsets[1]);
222        } else {
223          // find the handle (prevents issues with Safari)
224          while((this.handles.indexOf(handle) == -1) && handle.parentNode)
225            handle = handle.parentNode;
226
227          if(this.handles.indexOf(handle)!=-1) {
228            this.activeHandle    = handle;
229            this.activeHandleIdx = this.handles.indexOf(this.activeHandle);
230            this.updateStyles();
231
232            var offsets  = Position.cumulativeOffset(this.activeHandle);
233            this.offsetX = (pointer[0] - offsets[0]);
234            this.offsetY = (pointer[1] - offsets[1]);
235          }
236        }
237      }
238      Event.stop(event);
239    }
240  },
241  update: function(event) {
242   if(this.active) {
243      if(!this.dragging) this.dragging = true;
244      this.draw(event);
245      // fix AppleWebKit rendering
246      if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
247      Event.stop(event);
248   }
249  },
250  draw: function(event) {
251    var pointer = [Event.pointerX(event), Event.pointerY(event)];
252    var offsets = Position.cumulativeOffset(this.track);
253    pointer[0] -= this.offsetX + offsets[0];
254    pointer[1] -= this.offsetY + offsets[1];
255    this.event = event;
256    this.setValue(this.translateToValue( this.isVertical() ? pointer[1] : pointer[0] ));
257    if(this.initialized && this.options.onSlide)
258      this.options.onSlide(this.values.length>1 ? this.values : this.value, this);
259  },
260  endDrag: function(event) {
261    if(this.active && this.dragging) {
262      this.finishDrag(event, true);
263      Event.stop(event);
264    }
265    this.active = false;
266    this.dragging = false;
267  },
268  finishDrag: function(event, success) {
269    this.active = false;
270    this.dragging = false;
271    this.updateFinished();
272  },
273  updateFinished: function() {
274    if(this.initialized && this.options.onChange)
275      this.options.onChange(this.values.length>1 ? this.values : this.value, this);
276    this.event = null;
277  }
278}