1 // script.aculo.us slider.js v1.8.2, Tue Nov 18 18:30:58 +0100 2008
  2 
  3 // Copyright (c) 2005-2008 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 
  8 if (!Control) var Control = { };
  9 
 10 // options:
 11 //  axis: 'vertical', or 'horizontal' (default)
 12 //
 13 // callbacks:
 14 //  onChange(value)
 15 //  onSlide(value)
 16 Control.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  = Position.cumulativeOffset(this.track);
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  = Position.cumulativeOffset(this.activeHandle);
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  = Position.cumulativeOffset(this.activeHandle);
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 = Position.cumulativeOffset(this.track);
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 });