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// 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)
// increment: (default: 1)
// step: (default: 1)
//
// callbacks:
// onChange(value)
// onSlide(value)
Control.Slider.prototype = {
initialize: function(handle, track, options) {
this.handle = $(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.value = 0;
var defaultMaximum = Math.round(this.track.offsetWidth / this.increment);
if(this.isVertical()) defaultMaximum = Math.round(this.track.offsetHeight / this.increment);
this.maximum = this.options.maximum || defaultMaximum;
this.minimum = this.options.minimum || 0;
// 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;
// Zero out the slider position
this.setCurrentLeft(Position.cumulativeOffset(this.track)[0] - Position.cumulativeOffset(this.handle)[0] + this.alignX);
this.setCurrentTop(this.trackTop() - Position.cumulativeOffset(this.handle)[1] + this.alignY);
this.offsetX = 0;
this.offsetY = 0;
this.originalLeft = this.currentLeft();
this.originalTop = this.currentTop();
this.originalZ = parseInt(this.handle.style.zIndex || "0");
// Prepopulate Slider value
this.setSliderValue(parseInt(this.options.sliderValue) || 0);
this.active = false;
this.dragging = false;
this.disabled = false;
// FIXME: use css
this.handleImage = $(this.options.handleImage) || false;
this.handleDisabled = this.options.handleDisabled || false;
this.handleEnabled = false;
if(this.handleImage)
this.handleEnabled = this.handleImage.src || false;
if(this.options.disabled)
this.setDisabled();
// Value Array
this.values = this.options.values || false; // Add method to validate and sort??
Element.makePositioned(this.handle); // fix IE
this.eventMouseDown = this.startDrag.bindAsEventListener(this);
this.eventMouseUp = this.endDrag.bindAsEventListener(this);
this.eventMouseMove = this.update.bindAsEventListener(this);
this.eventKeypress = this.keyPress.bindAsEventListener(this);
Event.observe(this.handle, "mousedown", this.eventMouseDown);
Event.observe(document, "mouseup", this.eventMouseUp);
Event.observe(document, "mousemove", this.eventMouseMove);
Event.observe(document, "keypress", this.eventKeypress);
},
dispose: function() {
Event.stopObserving(this.handle, "mousedown", this.eventMouseDown);
Event.stopObserving(document, "mouseup", this.eventMouseUp);
Event.stopObserving(document, "mousemove", this.eventMouseMove);
Event.stopObserving(document, "keypress", this.eventKeypress);
},
setDisabled: function(){
this.disabled = true;
if(this.handleDisabled)
this.handleImage.src = this.handleDisabled;
},
setEnabled: function(){
this.disabled = false;
if(this.handleEnabled)
this.handleImage.src = this.handleEnabled;
},
currentLeft: function() {
return parseInt(this.handle.style.left || '0');
},
currentTop: function() {
return parseInt(this.handle.style.top || '0');
},
setCurrentLeft: function(left) {
this.handle.style.left = left +"px";
},
setCurrentTop: function(top) {
this.handle.style.top = top +"px";
},
trackLeft: function(){
return Position.cumulativeOffset(this.track)[0];
},
trackTop: function(){
return Position.cumulativeOffset(this.track)[1];
},
getNearestValue: function(value){
if(this.values){
var i = 0;
var offset = Math.abs(this.values[0] - value);
var newValue = this.values[0];
for(i=0; i < this.values.length; i++){
var currentOffset = Math.abs(this.values[i] - value);
if(currentOffset < offset){
newValue = this.values[i];
offset = currentOffset;
}
}
return newValue;
}
return value;
},
setSliderValue: function(sliderValue){
// First check our max and minimum and nearest values
sliderValue = this.getNearestValue(sliderValue);
if(sliderValue > this.maximum) sliderValue = this.maximum;
if(sliderValue < this.minimum) sliderValue = this.minimum;
var offsetDiff = (sliderValue - (this.value||this.minimum)) * this.increment;
if(this.isVertical()){
this.setCurrentTop(offsetDiff + this.currentTop());
} else {
this.setCurrentLeft(offsetDiff + this.currentLeft());
}
this.value = sliderValue;
this.updateFinished();
},
minimumOffset: function(){
return(this.isVertical() ?
this.trackTop() + this.alignY :
this.trackLeft() + this.alignX);
},
maximumOffset: function(){
return(this.isVertical() ?
this.trackTop() + this.alignY + (this.maximum - this.minimum) * this.increment :
this.trackLeft() + this.alignX + (this.maximum - this.minimum) * this.increment);
},
isVertical: function(){
return (this.axis == 'vertical');
},
startDrag: function(event) {
if(Event.isLeftClick(event)) {
if(!this.disabled){
this.active = true;
var pointer = [Event.pointerX(event), Event.pointerY(event)];
var offsets = Position.cumulativeOffset(this.handle);
this.offsetX = (pointer[0] - offsets[0]);
this.offsetY = (pointer[1] - offsets[1]);
this.originalLeft = this.currentLeft();
this.originalTop = this.currentTop();
}
Event.stop(event);
}
},
update: function(event) {
if(this.active) {
if(!this.dragging) {
var style = this.handle.style;
this.dragging = true;
if(style.position=="") style.position = "relative";
style.zIndex = this.options.zindex;
}
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.handle);
offsets[0] -= this.currentLeft();
offsets[1] -= this.currentTop();
// Adjust for the pointer's position on the handle
pointer[0] -= this.offsetX;
pointer[1] -= this.offsetY;
var style = this.handle.style;
if(this.isVertical()){
if(pointer[1] > this.maximumOffset())
pointer[1] = this.maximumOffset();
if(pointer[1] < this.minimumOffset())
pointer[1] = this.minimumOffset();
// Increment by values
if(this.values){
this.value = this.getNearestValue(Math.round((pointer[1] - this.minimumOffset()) / this.increment) + this.minimum);
pointer[1] = this.trackTop() + this.alignY + (this.value - this.minimum) * this.increment;
} else {
this.value = Math.round((pointer[1] - this.minimumOffset()) / this.increment) + this.minimum;
}
style.top = pointer[1] - offsets[1] + "px";
} else {
if(pointer[0] > this.maximumOffset()) pointer[0] = this.maximumOffset();
if(pointer[0] < this.minimumOffset()) pointer[0] = this.minimumOffset();
// Increment by values
if(this.values){
this.value = this.getNearestValue(Math.round((pointer[0] - this.minimumOffset()) / this.increment) + this.minimum);
pointer[0] = this.trackLeft() + this.alignX + (this.value - this.minimum) * this.increment;
} else {
this.value = Math.round((pointer[0] - this.minimumOffset()) / this.increment) + this.minimum;
}
style.left = (pointer[0] - offsets[0]) + "px";
}
if(this.options.onSlide) this.options.onSlide(this.value);
},
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.handle.style.zIndex = this.originalZ;
this.originalLeft = this.currentLeft();
this.originalTop = this.currentTop();
this.updateFinished();
},
updateFinished: function() {
if(this.options.onChange) this.options.onChange(this.value);
},
keyPress: function(event) {
if(this.active && !this.disabled) {
switch(event.keyCode) {
case Event.KEY_ESC:
this.finishDrag(event, false);
Event.stop(event);
break;
}
if(navigator.appVersion.indexOf('AppleWebKit')>0) Event.stop(event);
}
}
}
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