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

// 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 $PD(e);
        });
    } else {
        this.handles = [$PD(handle)];
    }
    this.track = $PD(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 || $PDR(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 $PD(s);
    }) : false;
    this.options.startSpan = $PD(this.options.startSpan || null);
    this.options.endSpan = $PD(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 != 0 ? this.handles[0].offsetHeight : this.handles[0].style.height.replace(/px$/, "")) : (this.handles[0].offsetWidth != 0 ? this.handles[0].offsetWidth : this.handles[0].style.width.replace(/px$/, ""));
    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.activeHandleIdx = handleIdx || 0;
        this.activeHandle = this.handles[this.activeHandleIdx];
        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 $PDR(v[range], v[range + 1]);
}, minimumOffset:function () {
    return (this.isVertical() ? this.alignY : this.alignX);
}, maximumOffset:function () {
    return (this.isVertical() ? (this.track.offsetHeight != 0 ? this.track.offsetHeight : this.track.style.height.replace(/px$/, "")) - this.alignY : (this.track.offsetWidth != 0 ? this.track.offsetWidth : this.track.style.width.replace(/px$/, "")) - this.alignY);
}, isVertical:function () {
    return (this.axis == "vertical");
}, drawSpans:function () {
    var slider = this;
    if (this.spans) {
        $PDR(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, $PDR(0, this.values.length > 1 ? this.getRange(0).min() : this.value));
    }
    if (this.options.endSpan) {
        this.setSpan(this.options.endSpan, $PDR(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)];
            var track = handle;
            if (track == 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;
}};