1 // script.aculo.us slider.js v1.8.0, Tue Nov 06 15:01:40 +0300 2007

     2 

     3 // Copyright (c) 2005-2007 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 });