[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      this.handleLength = this.isVertical() ? this.handles[0].offsetHeight : this.handles[0].offsetWidth;
  68  
  69      this.active   = false;
  70      this.dragging = false;
  71      this.disabled = false;
  72  
  73      if(this.options.disabled) this.setDisabled();
  74  
  75      // Allowed values array
  76      this.allowedValues = this.options.values ? this.options.values.sortBy(Prototype.K) : false;
  77      if(this.allowedValues) {
  78        this.minimum = this.allowedValues.min();
  79        this.maximum = this.allowedValues.max();
  80      }
  81  
  82      this.eventMouseDown = this.startDrag.bindAsEventListener(this);
  83      this.eventMouseUp   = this.endDrag.bindAsEventListener(this);
  84      this.eventMouseMove = this.update.bindAsEventListener(this);
  85  
  86      // Initialize handles in reverse (make sure first handle is active)
  87      this.handles.each( function(h,i) {
  88        i = slider.handles.length-1-i;
  89        slider.setValue(parseFloat(
  90          (slider.options.sliderValue instanceof Array ? 
  91            slider.options.sliderValue[i] : slider.options.sliderValue) || 
  92           slider.range.start), i);
  93        Element.makePositioned(h); // fix IE
  94        Event.observe(h, "mousedown", slider.eventMouseDown);
  95      });
  96      
  97      Event.observe(this.track, "mousedown", this.eventMouseDown);
  98      Event.observe(document, "mouseup", this.eventMouseUp);
  99      Event.observe(document, "mousemove", this.eventMouseMove);
 100      
 101      this.initialized = true;
 102    },
 103    dispose: function() {
 104      var slider = this;    
 105      Event.stopObserving(this.track, "mousedown", this.eventMouseDown);
 106      Event.stopObserving(document, "mouseup", this.eventMouseUp);
 107      Event.stopObserving(document, "mousemove", this.eventMouseMove);
 108      this.handles.each( function(h) {
 109        Event.stopObserving(h, "mousedown", slider.eventMouseDown);
 110      });
 111    },
 112    setDisabled: function(){
 113      this.disabled = true;
 114    },
 115    setEnabled: function(){
 116      this.disabled = false;
 117    },  
 118    getNearestValue: function(value){
 119      if(this.allowedValues){
 120        if(value >= this.allowedValues.max()) return(this.allowedValues.max());
 121        if(value <= this.allowedValues.min()) return(this.allowedValues.min());
 122        
 123        var offset = Math.abs(this.allowedValues[0] - value);
 124        var newValue = this.allowedValues[0];
 125        this.allowedValues.each( function(v) {
 126          var currentOffset = Math.abs(v - value);
 127          if(currentOffset <= offset){
 128            newValue = v;
 129            offset = currentOffset;
 130          } 
 131        });
 132        return newValue;
 133      }
 134      if(value > this.range.end) return this.range.end;
 135      if(value < this.range.start) return this.range.start;
 136      return value;
 137    },
 138    setValue: function(sliderValue, handleIdx){
 139      if(!this.active) {
 140        this.activeHandle    = this.handles[handleIdx];
 141        this.activeHandleIdx = handleIdx;
 142        this.updateStyles();
 143      }
 144      handleIdx = handleIdx || this.activeHandleIdx || 0;
 145      if(this.initialized && this.restricted) {
 146        if((handleIdx>0) && (sliderValue<this.values[handleIdx-1]))
 147          sliderValue = this.values[handleIdx-1];
 148        if((handleIdx < (this.handles.length-1)) && (sliderValue>this.values[handleIdx+1]))
 149          sliderValue = this.values[handleIdx+1];
 150      }
 151      sliderValue = this.getNearestValue(sliderValue);
 152      this.values[handleIdx] = sliderValue;
 153      this.value = this.values[0]; // assure backwards compat
 154      
 155      this.handles[handleIdx].style[this.isVertical() ? 'top' : 'left'] = 
 156        this.translateToPx(sliderValue);
 157      
 158      this.drawSpans();
 159      if(!this.dragging || !this.event) this.updateFinished();
 160    },
 161    setValueBy: function(delta, handleIdx) {
 162      this.setValue(this.values[handleIdx || this.activeHandleIdx || 0] + delta, 
 163        handleIdx || this.activeHandleIdx || 0);
 164    },
 165    translateToPx: function(value) {
 166      return Math.round(
 167        ((this.trackLength-this.handleLength)/(this.range.end-this.range.start)) * 
 168        (value - this.range.start)) + "px";
 169    },
 170    translateToValue: function(offset) {
 171      return ((offset/(this.trackLength-this.handleLength) * 
 172        (this.range.end-this.range.start)) + this.range.start);
 173    },
 174    getRange: function(range) {
 175      var v = this.values.sortBy(Prototype.K); 
 176      range = range || 0;
 177      return $R(v[range],v[range+1]);
 178    },
 179    minimumOffset: function(){
 180      return(this.isVertical() ? this.alignY : this.alignX);
 181    },
 182    maximumOffset: function(){
 183      return(this.isVertical() ?
 184        this.track.offsetHeight - this.alignY : this.track.offsetWidth - this.alignX);
 185    },  
 186    isVertical:  function(){
 187      return (this.axis == 'vertical');
 188    },
 189    drawSpans: function() {
 190      var slider = this;
 191      if(this.spans)
 192        $R(0, this.spans.length-1).each(function(r) { slider.setSpan(slider.spans[r], slider.getRange(r)) });
 193      if(this.options.startSpan)
 194        this.setSpan(this.options.startSpan,
 195          $R(0, this.values.length>1 ? this.getRange(0).min() : this.value ));
 196      if(this.options.endSpan)
 197        this.setSpan(this.options.endSpan, 
 198          $R(this.values.length>1 ? this.getRange(this.spans.length-1).max() : this.value, this.maximum));
 199    },
 200    setSpan: function(span, range) {
 201      if(this.isVertical()) {
 202        span.style.top = this.translateToPx(range.start);
 203        span.style.height = this.translateToPx(range.end - range.start + this.range.start);
 204      } else {
 205        span.style.left = this.translateToPx(range.start);
 206        span.style.width = this.translateToPx(range.end - range.start + this.range.start);
 207      }
 208    },
 209    updateStyles: function() {
 210      this.handles.each( function(h){ Element.removeClassName(h, 'selected') });
 211      Element.addClassName(this.activeHandle, 'selected');
 212    },
 213    startDrag: function(event) {
 214      if(Event.isLeftClick(event)) {
 215        if(!this.disabled){
 216          this.active = true;
 217          
 218          var handle = Event.element(event);
 219          var pointer  = [Event.pointerX(event), Event.pointerY(event)];
 220          if(handle==this.track) {
 221            var offsets  = Position.cumulativeOffset(this.track); 
 222            this.event = event;
 223            this.setValue(this.translateToValue( 
 224             (this.isVertical() ? pointer[1]-offsets[1] : pointer[0]-offsets[0])-(this.handleLength/2)
 225            ));
 226            var offsets  = Position.cumulativeOffset(this.activeHandle);
 227            this.offsetX = (pointer[0] - offsets[0]);
 228            this.offsetY = (pointer[1] - offsets[1]);
 229          } else {
 230            // find the handle (prevents issues with Safari)
 231            while((this.handles.indexOf(handle) == -1) && handle.parentNode) 
 232              handle = handle.parentNode;
 233          
 234            this.activeHandle    = handle;
 235            this.activeHandleIdx = this.handles.indexOf(this.activeHandle);
 236            this.updateStyles();
 237          
 238            var offsets  = Position.cumulativeOffset(this.activeHandle);
 239            this.offsetX = (pointer[0] - offsets[0]);
 240            this.offsetY = (pointer[1] - offsets[1]);
 241          }
 242        }
 243        Event.stop(event);
 244      }
 245    },
 246    update: function(event) {
 247     if(this.active) {
 248        if(!this.dragging) this.dragging = true;
 249        this.draw(event);
 250        // fix AppleWebKit rendering
 251        if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);
 252        Event.stop(event);
 253     }
 254    },
 255    draw: function(event) {
 256      var pointer = [Event.pointerX(event), Event.pointerY(event)];
 257      var offsets = Position.cumulativeOffset(this.track);
 258      pointer[0] -= this.offsetX + offsets[0];
 259      pointer[1] -= this.offsetY + offsets[1];
 260      this.event = event;
 261      this.setValue(this.translateToValue( this.isVertical() ? pointer[1] : pointer[0] ));
 262      if(this.initialized && this.options.onSlide)
 263        this.options.onSlide(this.values.length>1 ? this.values : this.value, this);
 264    },
 265    endDrag: function(event) {
 266      if(this.active && this.dragging) {
 267        this.finishDrag(event, true);
 268        Event.stop(event);
 269      }
 270      this.active = false;
 271      this.dragging = false;
 272    },  
 273    finishDrag: function(event, success) {
 274      this.active = false;
 275      this.dragging = false;
 276      this.updateFinished();
 277    },
 278    updateFinished: function() {
 279      if(this.initialized && this.options.onChange) 
 280        this.options.onChange(this.values.length>1 ? this.values : this.value, this);
 281      this.event = null;
 282    }
 283  }