[Sommaire] [Imprimer]

   1  // Copyright (c) 2005 Marty Haught, Thomas Fuchs 
   2  //
   3  // See http://script.aculo.us for more info
   4  // 
   5  // Permission is hereby granted, free of charge, to any person obtaining
   6  // a copy of this software and associated documentation files (the
   7  // "Software"), to deal in the Software without restriction, including
   8  // without limitation the rights to use, copy, modify, merge, publish,
   9  // distribute, sublicense, and/or sell copies of the Software, and to
  10  // permit persons to whom the Software is furnished to do so, subject to
  11  // the following conditions:
  12  // 
  13  // The above copyright notice and this permission notice shall be
  14  // included in all copies or substantial portions of the Software.
  15  //
  16  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  17  // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  18  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  19  // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  20  // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  21  // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  22  // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  
  24  if(!Control) var Control = {};
  25  Control.Slider = Class.create();
  26  
  27  // options:
  28  //  axis: 'vertical', or 'horizontal' (default)
  29  //
  30  // callbacks:
  31  //  onChange(value)
  32  //  onSlide(value)
  33  Control.Slider.prototype = {
  34    initialize: function(handle, track, options) {
  35      var slider = this;
  36      
  37      if(handle instanceof Array) {
  38        this.handles = handle.collect( function(e) { return $(e) });
  39      } else {
  40        this.handles = [$(handle)];
  41      }
  42      
  43      this.track   = $(track);
  44      this.options = options || {};
  45  
  46      this.axis      = this.options.axis || 'horizontal';
  47      this.increment = this.options.increment || 1;
  48      this.step      = parseInt(this.options.step || '1');
  49      this.range     = this.options.range || $R(0,1);
  50      
  51      this.value     = 0; // assure backwards compat
  52      this.values    = this.handles.map( function() { return 0 });
  53      this.spans     = this.options.spans ? this.options.spans.map(function(s){ return $(s) }) : false;
  54      this.options.startSpan = $(this.options.startSpan || null);
  55      this.options.endSpan   = $(this.options.endSpan || null);
  56  
  57      this.restricted = this.options.restricted || false;
  58  
  59      this.maximum   = this.options.maximum || this.range.end;
  60      this.minimum   = this.options.minimum || this.range.start;
  61  
  62      // Will be used to align the handle onto the track, if necessary
  63      this.alignX = parseInt(this.options.alignX || '0');
  64      this.alignY = parseInt(this.options.alignY || '0');
  65      
  66      this.trackLength = this.maximumOffset() - this.minimumOffset();
  67  
  68      this.active   = false;
  69      this.dragging = false;
  70      this.disabled = false;
  71  
  72      if(this.options.disabled) this.setDisabled();
  73  
  74      // Allowed values array
  75      this.allowedValues = this.options.values ? this.options.values.sortBy(Prototype.K) : false;
  76      if(this.allowedValues) {
  77        this.minimum = this.allowedValues.min();
  78        this.maximum = this.allowedValues.max();
  79      }
  80  
  81      this.eventMouseDown = this.startDrag.bindAsEventListener(this);
  82      this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
  83      this.eventMouseMove = this.update.bindAsEventListener(this);
  84  
  85      // Initialize handles in reverse (make sure first handle is active)
  86      this.handles.each( function(h,i) {
  87        i = slider.handles.length-1-i;
  88        slider.setValue(parseFloat(
  89          (slider.options.sliderValue instanceof Array ? 
  90            slider.options.sliderValue[i] : slider.options.sliderValue) || 
  91           slider.range.start), i);
  92        Element.makePositioned(h); // fix IE
  93        Event.observe(h, "mousedown", slider.eventMouseDown);
  94      });
  95      
  96      Event.observe(this.track, "mousedown", this.eventMouseDown);
  97      Event.observe(document, "mouseup", this.eventMouseUp);
  98      Event.observe(document, "mousemove", this.eventMouseMove);
  99      
 100      this.initialized = true;
 101    },
 102    dispose: function() {
 103      var slider = this;    
 104      Event.stopObserving(this.track, "mousedown", this.eventMouseDown);
 105      Event.stopObserving(document, "mouseup", this.eventMouseUp);
 106      Event.stopObserving(document, "mousemove", this.eventMouseMove);
 107      this.handles.each( function(h) {
 108        Event.stopObserving(h, "mousedown", slider.eventMouseDown);
 109      });
 110    },
 111    setDisabled: function(){
 112      this.disabled = true;
 113    },
 114    setEnabled: function(){
 115      this.disabled = false;
 116    },  
 117    getNearestValue: function(value){
 118      if(this.allowedValues){
 119        if(value >= this.allowedValues.max()) return(this.allowedValues.max());
 120        if(value <= this.allowedValues.min()) return(this.allowedValues.min());
 121        
 122        var offset = Math.abs(this.allowedValues[0] - value);
 123        var newValue = this.allowedValues[0];
 124        this.allowedValues.each( function(v) {
 125          var currentOffset = Math.abs(v - value);
 126          if(currentOffset <= offset){
 127            newValue = v;
 128            offset = currentOffset;
 129          } 
 130        });
 131        return newValue;
 132      }
 133      if(value > this.range.end) return this.range.end;
 134      if(value < this.range.start) return this.range.start;
 135      return value;
 136    },
 137    setValue: function(sliderValue, handleIdx){
 138      if(!this.active) {
 139        this.activeHandle    = this.handles[handleIdx];
 140        this.activeHandleIdx = handleIdx;
 141        this.updateStyles();
 142      }
 143      handleIdx = handleIdx || this.activeHandleIdx || 0;
 144      if(this.initialized && this.restricted) {
 145        if((handleIdx>0) && (sliderValue<this.values[handleIdx-1]))
 146          sliderValue = this.values[handleIdx-1];
 147        if((handleIdx < (this.handles.length-1)) && (sliderValue>this.values[handleIdx+1]))
 148          sliderValue = this.values[handleIdx+1];
 149      }
 150      sliderValue = this.getNearestValue(sliderValue);
 151      this.values[handleIdx] = sliderValue;
 152      this.value = this.values[0]; // assure backwards compat
 153      
 154      this.handles[handleIdx].style[this.isVertical() ? 'top' : 'left'] = 
 155        this.translateToPx(sliderValue);
 156      
 157      this.drawSpans();
 158      if(!this.dragging || !this.event) this.updateFinished();
 159    },
 160    setValueBy: function(delta, handleIdx) {
 161      this.setValue(this.values[handleIdx || this.activeHandleIdx || 0] + delta, 
 162        handleIdx || this.activeHandleIdx || 0);
 163    },
 164    translateToPx: function(value) {
 165      return Math.round((this.trackLength / (this.range.end - this.range.start)) * (value - this.range.start)) + "px";
 166    },
 167    translateToValue: function(offset) {
 168      return ((offset/this.trackLength) * (this.range.end - this.range.start)) + this.range.start;
 169    },
 170    getRange: function(range) {
 171      var v = this.values.sortBy(Prototype.K); 
 172      range = range || 0;
 173      return $R(v[range],v[range+1]);
 174    },
 175    minimumOffset: function(){
 176      return(this.isVertical() ? this.alignY : this.alignX);
 177    },
 178    maximumOffset: function(){
 179      return(this.isVertical() ?
 180        this.track.offsetHeight - this.alignY : this.track.offsetWidth - this.alignX);
 181    },  
 182    isVertical:  function(){
 183      return (this.axis == 'vertical');
 184    },
 185    drawSpans: function() {
 186      var slider = this;
 187      if(this.spans)
 188        $R(0, this.spans.length-1).each(function(r) { slider.setSpan(slider.spans[r], slider.getRange(r)) });
 189      if(this.options.startSpan)
 190        this.setSpan(this.options.startSpan,
 191          $R(0, this.values.length>1 ? this.getRange(0).min() : this.value ));
 192      if(this.options.endSpan)
 193        this.setSpan(this.options.endSpan, 
 194          $R(this.values.length>1 ? this.getRange(this.spans.length-1).max() : this.value, this.maximum));
 195    },
 196    setSpan: function(span, range) {
 197      if(this.isVertical()) {
 198        span.style.top = this.translateToPx(range.start);
 199        span.style.height = this.translateToPx(range.end - range.start);
 200      } else {
 201        span.style.left = this.translateToPx(range.start);
 202        span.style.width = this.translateToPx(range.end - range.start);
 203      }
 204    },
 205    updateStyles: function() {
 206      this.handles.each( function(h){ Element.removeClassName(h, 'selected') });
 207      Element.addClassName(this.activeHandle, 'selected');
 208    },
 209    startDrag: function(event) {
 210      if(Event.isLeftClick(event)) {
 211        if(!this.disabled){
 212          this.active = true;
 213          
 214          var handle = Event.element(event);
 215          var pointer  = [Event.pointerX(event), Event.pointerY(event)];
 216          if(handle==this.track) {
 217            var offsets  = Position.cumulativeOffset(this.track); 
 218            this.event = event;         
 219            this.setValue(this.translateToValue( 
 220              this.isVertical() ? pointer[1]-offsets[1] : pointer[0]-offsets[0]
 221            ));
 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            this.activeHandle    = handle;
 228            this.activeHandleIdx = this.handles.indexOf(this.activeHandle);
 229            this.updateStyles();
 230          
 231            var offsets  = Position.cumulativeOffset(this.activeHandle);
 232            this.offsetX = (pointer[0] - offsets[0]);
 233            this.offsetY = (pointer[1] - offsets[1]);
 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        // fix AppleWebKit rendering
 244        if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
 245        Event.stop(event);
 246     }
 247    },
 248    draw: function(event) {
 249      var pointer = [Event.pointerX(event), Event.pointerY(event)];
 250      var offsets = Position.cumulativeOffset(this.track);
 251      pointer[0] -= this.offsetX + offsets[0];
 252      pointer[1] -= this.offsetY + offsets[1];
 253      this.event = event;
 254      this.setValue(this.translateToValue( this.isVertical() ? pointer[1] : pointer[0] ));
 255      if(this.initialized && this.options.onSlide) 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  }