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File: lib/slider.js

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File: lib/slider.js
Role: Auxiliary data
Content type: text/plain
Description: slider.js
Class: RSPA
Process browser events on the server using AJAX
Author: By
Last change:
Date: 18 years ago
Size: 10,790 bytes
 

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// Copyright (c) 2005 Marty Haught, Thomas Fuchs // // See http://script.aculo.us for more info // // Permission is hereby granted, free of charge, to any person obtaining // a copy of this software and associated documentation files (the // "Software"), to deal in the Software without restriction, including // without limitation the rights to use, copy, modify, merge, publish, // distribute, sublicense, and/or sell copies of the Software, and to // permit persons to whom the Software is furnished to do so, subject to // the following conditions: // // The above copyright notice and this permission notice shall be // included in all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 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.options.startSpan = $(this.options.startSpan || null); this.options.endSpan = $(this.options.endSpan || null); 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.handleLength = this.isVertical() ? this.handles[0].offsetHeight : this.handles[0].offsetWidth; 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 in reverse (make sure first handle is active) this.handles.each( function(h,i) { i = slider.handles.length-1-i; slider.setValue(parseFloat( (slider.options.sliderValue instanceof Array ? slider.options.sliderValue[i] : slider.options.sliderValue) || slider.range.start), i); Element.makePositioned(h); // fix IE Event.observe(h, "mousedown", slider.eventMouseDown); }); Event.observe(this.track, "mousedown", this.eventMouseDown); Event.observe(document, "mouseup", this.eventMouseUp); Event.observe(document, "mousemove", this.eventMouseMove); this.initialized = true; }, dispose: function() { var slider = this; Event.stopObserving(this.track, "mousedown", this.eventMouseDown); 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; this.updateStyles(); } handleIdx = handleIdx || this.activeHandleIdx || 0; if(this.initialized && 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(); if(!this.dragging || !this.event) 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.handleLength)/(this.range.end-this.range.start)) * (value - this.range.start)) + "px"; }, translateToValue: function(offset) { return ((offset/(this.trackLength-this.handleLength) * (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(slider.spans[r], slider.getRange(r)) }); if(this.options.startSpan) this.setSpan(this.options.startSpan, $R(0, this.values.length>1 ? this.getRange(0).min() : this.value )); if(this.options.endSpan) this.setSpan(this.options.endSpan, $R(this.values.length>1 ? this.getRange(this.spans.length-1).max() : this.value, this.maximum)); }, setSpan: function(span, range) { if(this.isVertical()) { span.style.top = this.translateToPx(range.start); span.style.height = this.translateToPx(range.end - range.start + this.range.start); } else { span.style.left = this.translateToPx(range.start); span.style.width = this.translateToPx(range.end - range.start + this.range.start); } }, updateStyles: function() { this.handles.each( function(h){ Element.removeClassName(h, 'selected') }); Element.addClassName(this.activeHandle, 'selected'); }, startDrag: function(event) { if(Event.isLeftClick(event)) { if(!this.disabled){ this.active = true; var handle = Event.element(event); var pointer = [Event.pointerX(event), Event.pointerY(event)]; if(handle==this.track) { var offsets = Position.cumulativeOffset(this.track); this.event = event; this.setValue(this.translateToValue( (this.isVertical() ? pointer[1]-offsets[1] : pointer[0]-offsets[0])-(this.handleLength/2) )); var offsets = Position.cumulativeOffset(this.activeHandle); this.offsetX = (pointer[0] - offsets[0]); this.offsetY = (pointer[1] - offsets[1]); } else { // find the handle (prevents issues with Safari) while((this.handles.indexOf(handle) == -1) && handle.parentNode) handle = handle.parentNode; this.activeHandle = handle; this.activeHandleIdx = this.handles.indexOf(this.activeHandle); this.updateStyles(); 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; 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.event = event; this.setValue(this.translateToValue( this.isVertical() ? pointer[1] : pointer[0] )); if(this.initialized && 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.initialized && this.options.onChange) this.options.onChange(this.values.length>1 ? this.values : this.value, this); this.event = null; } }