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Diffstat (limited to 'root/js/slider.js')
| -rw-r--r-- | root/js/slider.js | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/root/js/slider.js b/root/js/slider.js new file mode 100644 index 0000000..736ed41 --- /dev/null +++ b/root/js/slider.js @@ -0,0 +1,226 @@ +// Copyright (c) 2005 Marty Haught +// +// See scriptaculous.js for full license. + +if(!Control) var Control = {}; +Control.Slider = Class.create(); + +// options: +// axis: 'vertical', or 'horizontal' (default) +// +// callbacks: +// onChange(value) +// onSlide(value) +Control.Slider.prototype = { + initialize: function(handle, track, options) { + var slider = this; + + if(handle instanceof Array) { + this.handles = handle.collect( function(e) { return $(e) }); + } else { + this.handles = [$(handle)]; + } + + this.track = $(track); + this.options = options || {}; + + this.axis = this.options.axis || 'horizontal'; + this.increment = this.options.increment || 1; + this.step = parseInt(this.options.step || '1'); + this.range = this.options.range || $R(0,1); + + this.value = 0; // assure backwards compat + this.values = this.handles.map( function() { return 0 }); + this.spans = this.options.spans ? this.options.spans.map(function(s){ return $(s) }) : false; + this.restricted = this.options.restricted || false; + + this.maximum = this.options.maximum || this.range.end; + this.minimum = this.options.minimum || this.range.start; + + // Will be used to align the handle onto the track, if necessary + this.alignX = parseInt(this.options.alignX || '0'); + this.alignY = parseInt(this.options.alignY || '0'); + + this.trackLength = this.maximumOffset() - this.minimumOffset(); + + this.active = false; + this.dragging = false; + this.disabled = false; + + if(this.options.disabled) this.setDisabled(); + + // Allowed values array + this.allowedValues = this.options.values ? this.options.values.sortBy(Prototype.K) : false; + if(this.allowedValues) { + this.minimum = this.allowedValues.min(); + this.maximum = this.allowedValues.max(); + } + + this.eventMouseDown = this.startDrag.bindAsEventListener(this); + this.eventMouseUp = this.endDrag.bindAsEventListener(this); + this.eventMouseMove = this.update.bindAsEventListener(this); + + // Initialize handles + this.handles.each( function(h,i) { + slider.setValue(parseInt(slider.options.sliderValue || slider.range.start), i); + Element.makePositioned(h); // fix IE + Event.observe(h, "mousedown", slider.eventMouseDown); + }); + + Event.observe(document, "mouseup", this.eventMouseUp); + Event.observe(document, "mousemove", this.eventMouseMove); + }, + dispose: function() { + var slider = this; + Event.stopObserving(document, "mouseup", this.eventMouseUp); + Event.stopObserving(document, "mousemove", this.eventMouseMove); + this.handles.each( function(h) { + Event.stopObserving(h, "mousedown", slider.eventMouseDown); + }); + }, + setDisabled: function(){ + this.disabled = true; + }, + setEnabled: function(){ + this.disabled = false; + }, + getNearestValue: function(value){ + if(this.allowedValues){ + if(value >= this.allowedValues.max()) return(this.allowedValues.max()); + if(value <= this.allowedValues.min()) return(this.allowedValues.min()); + + var offset = Math.abs(this.allowedValues[0] - value); + var newValue = this.allowedValues[0]; + this.allowedValues.each( function(v) { + var currentOffset = Math.abs(v - value); + if(currentOffset <= offset){ + newValue = v; + offset = currentOffset; + } + }); + return newValue; + } + if(value > this.range.end) return this.range.end; + if(value < this.range.start) return this.range.start; + return value; + }, + setValue: function(sliderValue, handleIdx){ + if(!this.active) { + this.activeHandle = this.handles[handleIdx]; + this.activeHandleIdx = handleIdx; + } + handleIdx = handleIdx || this.activeHandleIdx || 0; + if(this.restricted) { + if((handleIdx>0) && (sliderValue<this.values[handleIdx-1])) + sliderValue = this.values[handleIdx-1]; + if((handleIdx < (this.handles.length-1)) && (sliderValue>this.values[handleIdx+1])) + sliderValue = this.values[handleIdx+1]; + } + sliderValue = this.getNearestValue(sliderValue); + this.values[handleIdx] = sliderValue; + this.value = this.values[0]; // assure backwards compat + + this.handles[handleIdx].style[ this.isVertical() ? 'top' : 'left'] = + this.translateToPx(sliderValue); + + this.drawSpans(); + this.updateFinished(); + }, + setValueBy: function(delta, handleIdx) { + this.setValue(this.values[handleIdx || this.activeHandleIdx || 0] + delta, + handleIdx || this.activeHandleIdx || 0); + }, + translateToPx: function(value) { + return Math.round((this.trackLength / (this.range.end - this.range.start)) * (value - this.range.start)) + "px"; + }, + translateToValue: function(offset) { + return ((offset/this.trackLength) * (this.range.end - this.range.start)) + this.range.start; + }, + getRange: function(range) { + var v = this.values.sortBy(Prototype.K); + range = range || 0; + return $R(v[range],v[range+1]); + }, + minimumOffset: function(){ + return(this.isVertical() ? this.alignY : this.alignX); + }, + maximumOffset: function(){ + return(this.isVertical() ? + this.track.offsetHeight - this.alignY : this.track.offsetWidth - this.alignX); + }, + isVertical: function(){ + return (this.axis == 'vertical'); + }, + drawSpans: function() { + var slider = this; + if(this.spans) + $R(0, this.spans.length-1).each(function(r) { slider.setSpan(r, slider.getRange(r)) }); + }, + setSpan: function(span, range) { + if(this.isVertical()) { + this.spans[span].style.top = this.translateToPx(range.start); + this.spans[span].style.height = this.translateToPx(range.end - range.start); + } else { + this.spans[span].style.left = this.translateToPx(range.start); + this.spans[span].style.width = this.translateToPx(range.end - range.start); + } + }, + startDrag: function(event) { + if(Event.isLeftClick(event)) { + if(!this.disabled){ + this.active = true; + + // find the handle (prevents issues with Safari) + var handle = Event.element(event); + while((this.handles.indexOf(handle) == -1) && handle.parentNode) + handle = handle.parentNode; + + this.activeHandle = handle; + this.activeHandleIdx = this.handles.indexOf(this.activeHandle); + + var pointer = [Event.pointerX(event), Event.pointerY(event)]; + var offsets = Position.cumulativeOffset(this.activeHandle); + this.offsetX = (pointer[0] - offsets[0]); + this.offsetY = (pointer[1] - offsets[1]); + + } + Event.stop(event); + } + }, + update: function(event) { + if(this.active) { + if(!this.dragging) { + this.dragging = true; + if(this.activeHandle.style.position=="") style.position = "relative"; + } + this.draw(event); + // fix AppleWebKit rendering + if(navigator.appVersion.indexOf('AppleWebKit')>0) window.scrollBy(0,0); + Event.stop(event); + } + }, + draw: function(event) { + var pointer = [Event.pointerX(event), Event.pointerY(event)]; + var offsets = Position.cumulativeOffset(this.track); + pointer[0] -= this.offsetX + offsets[0]; + pointer[1] -= this.offsetY + offsets[1]; + this.setValue(this.translateToValue( this.isVertical() ? pointer[1] : pointer[0] )); + if(this.options.onSlide) this.options.onSlide(this.values.length>1 ? this.values : this.value, this); + }, + endDrag: function(event) { + if(this.active && this.dragging) { + this.finishDrag(event, true); + Event.stop(event); + } + this.active = false; + this.dragging = false; + }, + finishDrag: function(event, success) { + this.active = false; + this.dragging = false; + this.updateFinished(); + }, + updateFinished: function() { + if(this.options.onChange) this.options.onChange(this.values.length>1 ? this.values : this.value, this); + } +} |