1 // script.aculo.us slider.js v1.6.4, Wed Sep 06 11:30:58 CEST 2006

     2 

     3 // Copyright (c) 2005 Marty Haught, Thomas Fuchs 

     4 //

     5 // See http://script.aculo.us for more info

     6 // 

     7 // Permission is hereby granted, free of charge, to any person obtaining

     8 // a copy of this software and associated documentation files (the

     9 // "Software"), to deal in the Software without restriction, including

    10 // without limitation the rights to use, copy, modify, merge, publish,

    11 // distribute, sublicense, and/or sell copies of the Software, and to

    12 // permit persons to whom the Software is furnished to do so, subject to

    13 // the following conditions:

    14 // 

    15 // The above copyright notice and this permission notice shall be

    16 // included in all copies or substantial portions of the Software.

    17 //

    18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

    19 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

    20 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

    21 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

    22 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

    23 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

    24 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

    25 

    26 if(!Control) var Control = {};

    27 Control.Slider = Class.create();

    28 

    29 // options:

    30 //  axis: 'vertical', or 'horizontal' (default)

    31 //

    32 // callbacks:

    33 //  onChange(value)

    34 //  onSlide(value)

    35 Control.Slider.prototype = {

    36   initialize: function(handle, track, options) {

    37     var slider = this;

    38     

    39     if(handle instanceof Array) {

    40       this.handles = handle.collect( function(e) { return $(e) });

    41     } else {

    42       this.handles = [$(handle)];

    43     }

    44     

    45     this.track   = $(track);

    46     this.options = options || {};

    47 

    48     this.axis      = this.options.axis || 'horizontal';

    49     this.increment = this.options.increment || 1;

    50     this.step      = parseInt(this.options.step || '1');

    51     this.range     = this.options.range || $R(0,1);

    52     

    53     this.value     = 0; // assure backwards compat

    54     this.values    = this.handles.map( function() { return 0 });

    55     this.spans     = this.options.spans ? this.options.spans.map(function(s){ return $(s) }) : false;

    56     this.options.startSpan = $(this.options.startSpan || null);

    57     this.options.endSpan   = $(this.options.endSpan || null);

    58 

    59     this.restricted = this.options.restricted || false;

    60 

    61     this.maximum   = this.options.maximum || this.range.end;

    62     this.minimum   = this.options.minimum || this.range.start;

    63 

    64     // Will be used to align the handle onto the track, if necessary

    65     this.alignX = parseInt(this.options.alignX || '0');

    66     this.alignY = parseInt(this.options.alignY || '0');

    67     

    68     this.trackLength = this.maximumOffset() - this.minimumOffset();

    69 

    70     this.handleLength = this.isVertical() ? 

    71       (this.handles[0].offsetHeight != 0 ? 

    72         this.handles[0].offsetHeight : this.handles[0].style.height.replace(/px$/,"")) : 

    73       (this.handles[0].offsetWidth != 0 ? this.handles[0].offsetWidth : 

    74         this.handles[0].style.width.replace(/px$/,""));

    75 

    76     this.active   = false;

    77     this.dragging = false;

    78     this.disabled = false;

    79 

    80     if(this.options.disabled) this.setDisabled();

    81 

    82     // Allowed values array

    83     this.allowedValues = this.options.values ? this.options.values.sortBy(Prototype.K) : false;

    84     if(this.allowedValues) {

    85       this.minimum = this.allowedValues.min();

    86       this.maximum = this.allowedValues.max();

    87     }

    88 

    89     this.eventMouseDown = this.startDrag.bindAsEventListener(this);

    90     this.eventMouseUp   = this.endDrag.bindAsEventListener(this);

    91     this.eventMouseMove = this.update.bindAsEventListener(this);

    92 

    93     // Initialize handles in reverse (make sure first handle is active)

    94     this.handles.each( function(h,i) {

    95       i = slider.handles.length-1-i;

    96       slider.setValue(parseFloat(

    97         (slider.options.sliderValue instanceof Array ? 

    98           slider.options.sliderValue[i] : slider.options.sliderValue) || 

    99          slider.range.start), i);

   100       Element.makePositioned(h); // fix IE

   101       Event.observe(h, "mousedown", slider.eventMouseDown);

   102     });

   103     

   104     Event.observe(this.track, "mousedown", this.eventMouseDown);

   105     Event.observe(document, "mouseup", this.eventMouseUp);

   106     Event.observe(document, "mousemove", this.eventMouseMove);

   107     

   108     this.initialized = true;

   109   },

   110   dispose: function() {

   111     var slider = this;    

   112     Event.stopObserving(this.track, "mousedown", this.eventMouseDown);

   113     Event.stopObserving(document, "mouseup", this.eventMouseUp);

   114     Event.stopObserving(document, "mousemove", this.eventMouseMove);

   115     this.handles.each( function(h) {

   116       Event.stopObserving(h, "mousedown", slider.eventMouseDown);

   117     });

   118   },

   119   setDisabled: function(){

   120     this.disabled = true;

   121   },

   122   setEnabled: function(){

   123     this.disabled = false;

   124   },  

   125   getNearestValue: function(value){

   126     if(this.allowedValues){

   127       if(value >= this.allowedValues.max()) return(this.allowedValues.max());

   128       if(value <= this.allowedValues.min()) return(this.allowedValues.min());

   129       

   130       var offset = Math.abs(this.allowedValues[0] - value);

   131       var newValue = this.allowedValues[0];

   132       this.allowedValues.each( function(v) {

   133         var currentOffset = Math.abs(v - value);

   134         if(currentOffset <= offset){

   135           newValue = v;

   136           offset = currentOffset;

   137         } 

   138       });

   139       return newValue;

   140     }

   141     if(value > this.range.end) return this.range.end;

   142     if(value < this.range.start) return this.range.start;

   143     return value;

   144   },

   145   setValue: function(sliderValue, handleIdx){

   146     if(!this.active) {

   147       this.activeHandleIdx = handleIdx || 0;

   148       this.activeHandle    = this.handles[this.activeHandleIdx];

   149       this.updateStyles();

   150     }

   151     handleIdx = handleIdx || this.activeHandleIdx || 0;

   152     if(this.initialized && this.restricted) {

   153       if((handleIdx>0) && (sliderValue<this.values[handleIdx-1]))

   154         sliderValue = this.values[handleIdx-1];

   155       if((handleIdx < (this.handles.length-1)) && (sliderValue>this.values[handleIdx+1]))

   156         sliderValue = this.values[handleIdx+1];

   157     }

   158     sliderValue = this.getNearestValue(sliderValue);

   159     this.values[handleIdx] = sliderValue;

   160     this.value = this.values[0]; // assure backwards compat

   161     

   162     this.handles[handleIdx].style[this.isVertical() ? 'top' : 'left'] = 

   163       this.translateToPx(sliderValue);

   164     

   165     this.drawSpans();

   166     if(!this.dragging || !this.event) this.updateFinished();

   167   },

   168   setValueBy: function(delta, handleIdx) {

   169     this.setValue(this.values[handleIdx || this.activeHandleIdx || 0] + delta, 

   170       handleIdx || this.activeHandleIdx || 0);

   171   },

   172   translateToPx: function(value) {

   173     return Math.round(

   174       ((this.trackLength-this.handleLength)/(this.range.end-this.range.start)) * 

   175       (value - this.range.start)) + "px";

   176   },

   177   translateToValue: function(offset) {

   178     return ((offset/(this.trackLength-this.handleLength) * 

   179       (this.range.end-this.range.start)) + this.range.start);

   180   },

   181   getRange: function(range) {

   182     var v = this.values.sortBy(Prototype.K); 

   183     range = range || 0;

   184     return $R(v[range],v[range+1]);

   185   },

   186   minimumOffset: function(){

   187     return(this.isVertical() ? this.alignY : this.alignX);

   188   },

   189   maximumOffset: function(){

   190     return(this.isVertical() ? 

   191       (this.track.offsetHeight != 0 ? this.track.offsetHeight :

   192         this.track.style.height.replace(/px$/,"")) - this.alignY : 

   193       (this.track.offsetWidth != 0 ? this.track.offsetWidth : 

   194         this.track.style.width.replace(/px$/,"")) - this.alignY);

   195   },  

   196   isVertical:  function(){

   197     return (this.axis == 'vertical');

   198   },

   199   drawSpans: function() {

   200     var slider = this;

   201     if(this.spans)

   202       $R(0, this.spans.length-1).each(function(r) { slider.setSpan(slider.spans[r], slider.getRange(r)) });

   203     if(this.options.startSpan)

   204       this.setSpan(this.options.startSpan,

   205         $R(0, this.values.length>1 ? this.getRange(0).min() : this.value ));

   206     if(this.options.endSpan)

   207       this.setSpan(this.options.endSpan, 

   208         $R(this.values.length>1 ? this.getRange(this.spans.length-1).max() : this.value, this.maximum));

   209   },

   210   setSpan: function(span, range) {

   211     if(this.isVertical()) {

   212       span.style.top = this.translateToPx(range.start);

   213       span.style.height = this.translateToPx(range.end - range.start + this.range.start);

   214     } else {

   215       span.style.left = this.translateToPx(range.start);

   216       span.style.width = this.translateToPx(range.end - range.start + this.range.start);

   217     }

   218   },

   219   updateStyles: function() {

   220     this.handles.each( function(h){ Element.removeClassName(h, 'selected') });

   221     Element.addClassName(this.activeHandle, 'selected');

   222   },

   223   startDrag: function(event) {

   224     if(Event.isLeftClick(event)) {

   225       if(!this.disabled){

   226         this.active = true;

   227         

   228         var handle = Event.element(event);

   229         var pointer  = [Event.pointerX(event), Event.pointerY(event)];

   230         var track = handle;

   231         if(track==this.track) {

   232           var offsets  = Position.cumulativeOffset(this.track); 

   233           this.event = event;

   234           this.setValue(this.translateToValue( 

   235            (this.isVertical() ? pointer[1]-offsets[1] : pointer[0]-offsets[0])-(this.handleLength/2)

   236           ));

   237           var offsets  = Position.cumulativeOffset(this.activeHandle);

   238           this.offsetX = (pointer[0] - offsets[0]);

   239           this.offsetY = (pointer[1] - offsets[1]);

   240         } else {

   241           // find the handle (prevents issues with Safari)

   242           while((this.handles.indexOf(handle) == -1) && handle.parentNode) 

   243             handle = handle.parentNode;

   244         

   245           this.activeHandle    = handle;

   246           this.activeHandleIdx = this.handles.indexOf(this.activeHandle);

   247           this.updateStyles();

   248         

   249           var offsets  = Position.cumulativeOffset(this.activeHandle);

   250           this.offsetX = (pointer[0] - offsets[0]);

   251           this.offsetY = (pointer[1] - offsets[1]);

   252         }

   253       }

   254       Event.stop(event);

   255     }

   256   },

   257   update: function(event) {

   258    if(this.active) {

   259       if(!this.dragging) this.dragging = true;

   260       this.draw(event);

   261       // fix AppleWebKit rendering

   262       if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0);

   263       Event.stop(event);

   264    }

   265   },

   266   draw: function(event) {

   267     var pointer = [Event.pointerX(event), Event.pointerY(event)];

   268     var offsets = Position.cumulativeOffset(this.track);

   269     pointer[0] -= this.offsetX + offsets[0];

   270     pointer[1] -= this.offsetY + offsets[1];

   271     this.event = event;

   272     this.setValue(this.translateToValue( this.isVertical() ? pointer[1] : pointer[0] ));

   273     if(this.initialized && this.options.onSlide)

   274       this.options.onSlide(this.values.length>1 ? this.values : this.value, this);

   275   },

   276   endDrag: function(event) {

   277     if(this.active && this.dragging) {

   278       this.finishDrag(event, true);

   279       Event.stop(event);

   280     }

   281     this.active = false;

   282     this.dragging = false;

   283   },  

   284   finishDrag: function(event, success) {

   285     this.active = false;

   286     this.dragging = false;

   287     this.updateFinished();

   288   },

   289   updateFinished: function() {

   290     if(this.initialized && this.options.onChange) 

   291       this.options.onChange(this.values.length>1 ? this.values : this.value, this);

   292     this.event = null;

   293   }

   294 }