[Sommaire] [Imprimer]

   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  
   8  if(!Control) var Control = {};
   9  Control.Slider = Class.create();
  10  
  11  // options:
  12  //  axis: 'vertical', or 'horizontal' (default)
  13  //
  14  // callbacks:
  15  //  onChange(value)
  16  //  onSlide(value)
  17  Control.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  }