1// script.aculo.us slider.js v1.8.3, Thu Oct 08 11:23:33 +0200 2009
2
3// Copyright (c) 2005-2009 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 = { };
9
10// options:
11//  axis: 'vertical', or 'horizontal' (default)
12//
13// callbacks:
14//  onChange(value)
15//  onSlide(value)
16Control.Slider = Class.create({
17  initialize: function(handle, track, options) {
18    var slider = this;
19
20    if (Object.isArray(handle)) {
21      this.handles = handle.collect( function(e) { return $(e) });
22    } else {
23      this.handles = [$(handle)];
24    }
25
26    this.track   = $(track);
27    this.options = options || { };
28
29    this.axis      = this.options.axis || 'horizontal';
30    this.increment = this.options.increment || 1;
31    this.step      = parseInt(this.options.step || '1');
32    this.range     = this.options.range || $R(0,1);
33
34    this.value     = 0; // assure backwards compat
35    this.values    = this.handles.map( function() { return 0 });
36    this.spans     = this.options.spans ? this.options.spans.map(function(s){ return $(s) }) : false;
37    this.options.startSpan = $(this.options.startSpan || null);
38    this.options.endSpan   = $(this.options.endSpan || null);
39
40    this.restricted = this.options.restricted || false;
41
42    this.maximum   = this.options.maximum || this.range.end;
43    this.minimum   = this.options.minimum || this.range.start;
44
45    // Will be used to align the handle onto the track, if necessary
46    this.alignX = parseInt(this.options.alignX || '0');
47    this.alignY = parseInt(this.options.alignY || '0');
48
49    this.trackLength = this.maximumOffset() - this.minimumOffset();
50
51    this.handleLength = this.isVertical() ?
52      (this.handles[0].offsetHeight != 0 ?
53        this.handles[0].offsetHeight : this.handles[0].style.height.replace(/px$/,"")) :
54      (this.handles[0].offsetWidth != 0 ? this.handles[0].offsetWidth :
55        this.handles[0].style.width.replace(/px$/,""));
56
57    this.active   = false;
58    this.dragging = false;
59    this.disabled = false;
60
61    if (this.options.disabled) this.setDisabled();
62
63    // Allowed values array
64    this.allowedValues = this.options.values ? this.options.values.sortBy(Prototype.K) : false;
65    if (this.allowedValues) {
66      this.minimum = this.allowedValues.min();
67      this.maximum = this.allowedValues.max();
68    }
69
70    this.eventMouseDown = this.startDrag.bindAsEventListener(this);
71    this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
72    this.eventMouseMove = this.update.bindAsEventListener(this);
73
74    // Initialize handles in reverse (make sure first handle is active)
75    this.handles.each( function(h,i) {
76      i = slider.handles.length-1-i;
77      slider.setValue(parseFloat(
78        (Object.isArray(slider.options.sliderValue) ?
79          slider.options.sliderValue[i] : slider.options.sliderValue) ||
80         slider.range.start), i);
81      h.makePositioned().observe("mousedown", slider.eventMouseDown);
82    });
83
84    this.track.observe("mousedown", this.eventMouseDown);
85    document.observe("mouseup", this.eventMouseUp);
86    document.observe("mousemove", this.eventMouseMove);
87
88    this.initialized = true;
89  },
90  dispose: function() {
91    var slider = this;
92    Event.stopObserving(this.track, "mousedown", this.eventMouseDown);
93    Event.stopObserving(document, "mouseup", this.eventMouseUp);
94    Event.stopObserving(document, "mousemove", this.eventMouseMove);
95    this.handles.each( function(h) {
96      Event.stopObserving(h, "mousedown", slider.eventMouseDown);
97    });
98  },
99  setDisabled: function(){
100    this.disabled = true;
101  },
102  setEnabled: function(){
103    this.disabled = false;
104  },
105  getNearestValue: function(value){
106    if (this.allowedValues){
107      if (value >= this.allowedValues.max()) return(this.allowedValues.max());
108      if (value <= this.allowedValues.min()) return(this.allowedValues.min());
109
110      var offset = Math.abs(this.allowedValues[0] - value);
111      var newValue = this.allowedValues[0];
112      this.allowedValues.each( function(v) {
113        var currentOffset = Math.abs(v - value);
114        if (currentOffset <= offset){
115          newValue = v;
116          offset = currentOffset;
117        }
118      });
119      return newValue;
120    }
121    if (value > this.range.end) return this.range.end;
122    if (value < this.range.start) return this.range.start;
123    return value;
124  },
125  setValue: function(sliderValue, handleIdx){
126    if (!this.active) {
127      this.activeHandleIdx = handleIdx || 0;
128      this.activeHandle    = this.handles[this.activeHandleIdx];
129      this.updateStyles();
130    }
131    handleIdx = handleIdx || this.activeHandleIdx || 0;
132    if (this.initialized && this.restricted) {
133      if ((handleIdx>0) && (sliderValue<this.values[handleIdx-1]))
134        sliderValue = this.values[handleIdx-1];
135      if ((handleIdx < (this.handles.length-1)) && (sliderValue>this.values[handleIdx+1]))
136        sliderValue = this.values[handleIdx+1];
137    }
138    sliderValue = this.getNearestValue(sliderValue);
139    this.values[handleIdx] = sliderValue;
140    this.value = this.values[0]; // assure backwards compat
141
142    this.handles[handleIdx].style[this.isVertical() ? 'top' : 'left'] =
143      this.translateToPx(sliderValue);
144
145    this.drawSpans();
146    if (!this.dragging || !this.event) this.updateFinished();
147  },
148  setValueBy: function(delta, handleIdx) {
149    this.setValue(this.values[handleIdx || this.activeHandleIdx || 0] + delta,
150      handleIdx || this.activeHandleIdx || 0);
151  },
152  translateToPx: function(value) {
153    return Math.round(
154      ((this.trackLength-this.handleLength)/(this.range.end-this.range.start)) *
155      (value - this.range.start)) + "px";
156  },
157  translateToValue: function(offset) {
158    return ((offset/(this.trackLength-this.handleLength) *
159      (this.range.end-this.range.start)) + this.range.start);
160  },
161  getRange: function(range) {
162    var v = this.values.sortBy(Prototype.K);
163    range = range || 0;
164    return $R(v[range],v[range+1]);
165  },
166  minimumOffset: function(){
167    return(this.isVertical() ? this.alignY : this.alignX);
168  },
169  maximumOffset: function(){
170    return(this.isVertical() ?
171      (this.track.offsetHeight != 0 ? this.track.offsetHeight :
172        this.track.style.height.replace(/px$/,"")) - this.alignY :
173      (this.track.offsetWidth != 0 ? this.track.offsetWidth :
174        this.track.style.width.replace(/px$/,"")) - this.alignX);
175  },
176  isVertical:  function(){
177    return (this.axis == 'vertical');
178  },
179  drawSpans: function() {
180    var slider = this;
181    if (this.spans)
182      $R(0, this.spans.length-1).each(function(r) { slider.setSpan(slider.spans[r], slider.getRange(r)) });
183    if (this.options.startSpan)
184      this.setSpan(this.options.startSpan,
185        $R(0, this.values.length>1 ? this.getRange(0).min() : this.value ));
186    if (this.options.endSpan)
187      this.setSpan(this.options.endSpan,
188        $R(this.values.length>1 ? this.getRange(this.spans.length-1).max() : this.value, this.maximum));
189  },
190  setSpan: function(span, range) {
191    if (this.isVertical()) {
192      span.style.top = this.translateToPx(range.start);
193      span.style.height = this.translateToPx(range.end - range.start + this.range.start);
194    } else {
195      span.style.left = this.translateToPx(range.start);
196      span.style.width = this.translateToPx(range.end - range.start + this.range.start);
197    }
198  },
199  updateStyles: function() {
200    this.handles.each( function(h){ Element.removeClassName(h, 'selected') });
201    Element.addClassName(this.activeHandle, 'selected');
202  },
203  startDrag: function(event) {
204    if (Event.isLeftClick(event)) {
205      if (!this.disabled){
206        this.active = true;
207
208        var handle = Event.element(event);
209        var pointer  = [Event.pointerX(event), Event.pointerY(event)];
210        var track = handle;
211        if (track==this.track) {
212          var offsets  = this.track.cumulativeOffset();
213          this.event = event;
214          this.setValue(this.translateToValue(
215           (this.isVertical() ? pointer[1]-offsets[1] : pointer[0]-offsets[0])-(this.handleLength/2)
216          ));
217          var offsets  = this.activeHandle.cumulativeOffset();
218          this.offsetX = (pointer[0] - offsets[0]);
219          this.offsetY = (pointer[1] - offsets[1]);
220        } else {
221          // find the handle (prevents issues with Safari)
222          while((this.handles.indexOf(handle) == -1) && handle.parentNode)
223            handle = handle.parentNode;
224
225          if (this.handles.indexOf(handle)!=-1) {
226            this.activeHandle    = handle;
227            this.activeHandleIdx = this.handles.indexOf(this.activeHandle);
228            this.updateStyles();
229
230            var offsets  = this.activeHandle.cumulativeOffset();
231            this.offsetX = (pointer[0] - offsets[0]);
232            this.offsetY = (pointer[1] - offsets[1]);
233          }
234        }
235      }
236      Event.stop(event);
237    }
238  },
239  update: function(event) {
240   if (this.active) {
241      if (!this.dragging) this.dragging = true;
242      this.draw(event);
243      if (Prototype.Browser.WebKit) window.scrollBy(0,0);
244      Event.stop(event);
245   }
246  },
247  draw: function(event) {
248    var pointer = [Event.pointerX(event), Event.pointerY(event)];
249    var offsets = this.track.cumulativeOffset();
250    pointer[0] -= this.offsetX + offsets[0];
251    pointer[1] -= this.offsetY + offsets[1];
252    this.event = event;
253    this.setValue(this.translateToValue( this.isVertical() ? pointer[1] : pointer[0] ));
254    if (this.initialized && this.options.onSlide)
255      this.options.onSlide(this.values.length>1 ? this.values : this.value, this);
256  },
257  endDrag: function(event) {
258    if (this.active && this.dragging) {
259      this.finishDrag(event, true);
260      Event.stop(event);
261    }
262    this.active = false;
263    this.dragging = false;
264  },
265  finishDrag: function(event, success) {
266    this.active = false;
267    this.dragging = false;
268    this.updateFinished();
269  },
270  updateFinished: function() {
271    if (this.initialized && this.options.onChange)
272      this.options.onChange(this.values.length>1 ? this.values : this.value, this);
273    this.event = null;
274  }
275});