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| var Slider = new Class({
Implements: [Events, Options],
Binds: ['clickedElement', 'draggedKnob', 'syncOrder', 'scrolledElement'],
options: {/*
onTick: $empty(intPosition),
onChange: $empty(intStep),
onComplete: $empty(strStep),
onSetCollision: $empty(setKnob,[hitKnobs]),
onDragCollision: $empty(draggedKnob, hitKnob)*/
onTick: function(position){
if (this.options.snap) position = this.toPosition(this.step);
this.knob.setStyle(this.property, position);
},
snap: false,
offset: 0,
range: false,
wheel: false,
steps: 100,
mode: 'horizontal',
multiKnob: false,
measure: false
},
initialize: function(element, knob, options){
this.setOptions(options);
this.element = document.id(element);
this.knobSpacing = this.options.knobSpacing;
this.knob = document.id(knob).store('slider', this);
this.previousChange = this.previousEnd = this.step = -1;
var offset, limit = {}, modifiers = {'x': false, 'y': false};
switch (this.options.mode){
case 'vertical':
this.axis = 'y';
this.property = 'top';
offset = 'offsetHeight';
break;
case 'horizontal':
this.axis = 'x';
this.property = 'left';
offset = 'offsetWidth';
}
if(this.options.measure){
this.full = this.element.measure(function(){ this.half = this.knob[offset] / 2; return this.element[offset] - this.knob[offset] + (this.options.offset * 2); }.bind(this));
}
else{
this.full = this.element[offset] - this.knob[offset] + (this.options.offset * 2);
this.half = this.knob[offset] / 2;
}
this.min = $chk(this.options.range[0]) ? this.options.range[0] : 0;
this.max = $chk(this.options.range[1]) ? this.options.range[1] : this.options.steps;
this.range = this.max - this.min;
this.steps = this.options.steps || this.full;
this.stepSize = Math.abs(this.range) / this.steps;
this.stepWidth = this.stepSize * this.full / Math.abs(this.range) ;
//added either relative or absolute positioning to the element and absolutely positioned knobs so knobs do not clear their respective lefts and rights
var elementPosition = this.element.getStyle('position');
if(elementPosition != 'relative' || elementPosition != 'absolute'){ this.element.setStyle('position', 'relative'); }
this.knob.setStyle('position', (this.options.multiKnob) ? 'absolute' : 'relative').setStyle(this.property, - this.options.offset);
modifiers[this.axis] = this.property;
limit[this.axis] = [- this.options.offset, this.full - this.options.offset];
this.bound = {
clickedElement: this.clickedElement.bind(this),
scrolledElement: this.scrolledElement.bindWithEvent(this),
draggedKnob: this.draggedKnob.bind(this)
};
var dragOptions = {
snap: 0,
limit: limit,
modifiers: modifiers,
onDrag: this.bound.draggedKnob,
onStart: this.bound.draggedKnob,
onBeforeStart: (function(){
this.isDragging = true;
}).bind(this),
onComplete: function(){
this.isDragging = false;
this.draggedKnob();
this.knob.removeClass('collided');
this.drag.firstStep = true;
this.syncOrder();
this.end();
}.bind(this)
};
if (this.options.snap){
dragOptions.grid = Math.ceil(this.stepWidth);
dragOptions.limit[this.axis][1] = this.full;
}
this.drag = new Drag(this.knob, dragOptions), this.drag.firstStep = true;
this.attach();
},
attach: function(){
//click and mousewheel events are not added to multiknob sliders for obvious reasons
if(!this.options.multiKnob){
this.element.addEvent('mousedown', this.bound.clickedElement);
if (this.options.wheel) this.element.addEvent('mousewheel', this.bound.scrolledElement);
}
this.drag.attach();
return this;
},
detach: function(){
this.element.removeEvent('mousedown', this.bound.clickedElement);
this.element.removeEvent('mousewheel', this.bound.scrolledElement);
this.drag.detach();
return this;
},
set: function(step){
if (!((this.range > 0) ^ (step < this.min))) step = this.min;
if (!((this.range > 0) ^ (step > this.max))) step = this.max;
//added check to prevented knobs from being set to steps that violate the spacing of knobs
var instances = this.element.getChildren().retrieve('slider').erase(this).filter(function(e){ return e != null; }), hitKnobs = [];
instances.each(function(e, i){
var knobSpacing = Math.max(this.knobSpacing, e.knobSpacing);
if($defined(this.knobSpacing) && $defined(e.knobSpacing) && step > e.step - knobSpacing && step < e.step + knobSpacing){ hitKnobs.push(e.knob) };
}.bind(this));
if(hitKnobs.length > 0){ this.fireEvent('setCollision', [this.knob, hitKnobs]); return; }
else{
this.step = Math.round(step);
this.checkStep();
this.fireEvent('tick', this.toPosition(this.step));
this.syncOrder();
this.end();
return this;
}
},
clickedElement: function(event){
if (this.isDragging || event.target == this.knob) return;
var dir = this.range < 0 ? -1 : 1;
var position = event.page[this.axis] - this.element.getPosition()[this.axis] - this.half;
position = position.limit(-this.options.offset, this.full -this.options.offset);
this.step = Math.round(this.min + dir * this.toStep(position));
this.checkStep();
this.fireEvent('tick', position);
this.end();
},
scrolledElement: function(event){
var mode = (this.options.mode == 'horizontal') ? (event.wheel < 0) : (event.wheel > 0);
this.set(mode ? this.step - this.stepSize : this.step + this.stepSize);
event.stop();
},
draggedKnob: function(){
var dir = this.range < 0 ? -1 : 1;
var position = this.drag.value.now[this.axis];
var lastKnob = this.knob.getAllPrevious(), lastKnob = lastKnob.filter(function(e,i,a){ return e.retrieve('slider').knobSpacing != null; })[0];
var nextKnob = this.knob.getAllNext(), nextKnob = nextKnob.filter(function(e,i,a){ return e.retrieve('slider').knobSpacing != null; })[0];
var lastSlider = (lastKnob) ? lastKnob.retrieve('slider') : {}, nextSlider = (nextKnob) ? nextKnob.retrieve('slider') : {};
position = position.limit(-this.options.offset, this.full -this.options.offset);
//added check to prevented knobs from being dragged to steps that violate the spacing of knobs
if(this.step > this.toStep(position)){
var knobSpacing = Math.max(this.knobSpacing, lastSlider.knobSpacing);
if($defined(lastSlider.knobSpacing) && $defined(this.knobSpacing) && position < lastSlider.step * lastSlider.stepWidth + knobSpacing * lastSlider.stepWidth){
this.set(lastSlider.step + knobSpacing);
if(!this.knob.hasClass('collided') && !this.drag.firstStep){ this.knob.addClass('collided'); this.fireEvent('dragCollision', [this.knob, lastKnob]); }
this.drag.firstStep = false;
}
else{ this.knob.removeClass('collided'); this.step = Math.round(this.min + dir * this.toStep(position)); }
}
else{
var knobSpacing = Math.max(this.knobSpacing, nextSlider.knobSpacing);
if($defined(nextSlider.knobSpacing) && $defined(this.knobSpacing) && position > nextSlider.step * nextSlider.stepWidth - knobSpacing * nextSlider.stepWidth){
this.set(nextSlider.step - knobSpacing);
if(!this.knob.hasClass('collided') && !this.drag.firstStep){ this.knob.addClass('collided'); this.fireEvent('dragCollision', [this.knob, nextKnob]); }
this.drag.firstStep = false;
}
else{ this.knob.removeClass('collided'); this.step = Math.round(this.min + dir * this.toStep(position)); }
}
this.checkStep();
},
syncOrder:function(){
var pinhash = $H();
var sorted = this.element.getChildren().retrieve('slider').filter(function(e){ return e != null; }).map(function(e){ pinhash.include(e.step,e.knob); return e.step }).sort(function(a, b){ return a - b; });
pinhash.each(function(v,k,h){
var pin = h.get(sorted[0]);
if(pin){
pin.inject(this.element, 'bottom');
sorted.shift();
}
}.bind(this));
},
checkStep: function(){
if (this.previousChange != this.step){
this.previousChange = this.step;
this.fireEvent('change', this.step);
}
},
end: function(){
if (this.previousEnd !== this.step){
this.previousEnd = this.step;
this.fireEvent('complete', this.step + '');
}
},
toStep: function(position){
var step = (position + this.options.offset) * this.stepSize / this.full * this.steps;
return this.options.steps ? Math.round(step -= step % this.stepSize) : step;
},
toPosition: function(step){
return (this.full * Math.abs(this.min - step)) / (this.steps * this.stepSize) - this.options.offset;
}
});
//Here is an example usage, you basically call a Mootools slider instance up for each pin. You must pass in multiKnob: true
// - there is also an added feature bonus in that you can specify a knob spacing for each of the knobs you add to your slider,
// this lets you set the step-wise distance away that each pin will keep from one another.
$$('#search_filter_primaryWrap .slideknob').each(function(e,i){
var slidelabel_min = e.getParent().getPrevious(), slidelabel_max = e.getParent().getNext();
new Slider(e.getParent(), e, {
range: [0, 100],
steps: 100,
multiKnob: true,
knobSpacing: 5,
onChange: function(pos){
(e.hasClass('slideknob_min')) ? slidelabel_min.set('html', 'min<div>'+ pos +'%</div>') : slidelabel_max.set('html', 'max<div>'+ pos +'%</div>');
}
}).set((e.hasClass('slideknob_min')) ? 0 : 100);
}); |
