//---------------------------------+
//  CARPE  S l i d e r        1.5  |
//  2006 - 01 - 03                 |
//  By Tom Hermansson Snickars     |
//  Copyright CARPE Design         |
//  http://carpe.ambiprospect.com/ |
//  Contact for custom scripts     |
//  or implementation help.        |
//---------------------------------+

// Global vars. You don't need to make changes here to change your sliders.
// Changing the attributes in your (X)HTML file is enough.
var carpeDefaultSliderLength      = 100
var carpeSliderDefaultOrientation = 'horizontal'
var carpeSliderClassName          = 'carpe_slider'
var carpeSliderDisplayClassName   = 'carpe_slider_display'


// global vars for moving slider
var mouseover = false;	// if slider is moving
var currSliderId = ''	// slider id

// carpeGetElementsByClass: Cross-browser function that returns
// an array with all elements that have a class attribute that
// contains className
function carpeGetElementsByClass(className)
{
	var classElements = new Array()
	var els = document.getElementsByTagName("*")
	var elsLen = els.length
	var pattern = new RegExp("\\b" + className + "\\b")
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i]
			j++
		}
	}
	return classElements;
}
// carpeLeft: Cross-browser version of "element.style.left"
// Returns or sets the horizontal position of an element.
function carpeLeft(elmnt, pos)
{
	if (!(elmnt = document.getElementById(elmnt))) return 0;
	if (elmnt.style && (typeof(elmnt.style.left) == 'string')) {
		if (typeof(pos) == 'number') elmnt.style.left = pos + 'px';
		else {
			pos = parseInt(elmnt.style.left);
			if (isNaN(pos)) pos = 0;
		}
	}
	else if (elmnt.style && elmnt.style.pixelLeft) {
		if (typeof(pos) == 'number') elmnt.style.pixelLeft = pos;
		else pos = elmnt.style.pixelLeft;
	}
	return pos;
}
// carpeTop: Cross-browser version of "element.style.top"
// Returns or sets the vertical position of an element.
function carpeTop(elmnt, pos)
{
	if (!(elmnt = document.getElementById(elmnt))) return 0;
	if (elmnt.style && (typeof(elmnt.style.top) == 'string')) {
		if (typeof(pos) == 'number') elmnt.style.top = pos + 'px';
		else {
			pos = parseInt(elmnt.style.top);
			if (isNaN(pos)) pos = 0;
		}
	}
	else if (elmnt.style && elmnt.style.pixelTop) {
		if (typeof(pos) == 'number') elmnt.style.pixelTop = pos;
		else pos = elmnt.style.pixelTop;
	}
	return pos;
}
// moveSlider: Handles slider and display while dragging
function moveSlider(evnt)
{
	var evnt = (!evnt) ? window.event : evnt; // The mousemove event
	if (mouseover) { // Only if slider is dragged
		var sliderCombo = getSliderCombo(currSliderId);
		var slider = sliderCombo.slider;
		var x = slider.startOffsetX + evnt.screenX // Horizontal mouse position relative to allowed slider positions
		var y = slider.startOffsetY + evnt.screenY // Horizontal mouse position relative to allowed slider positions
		if (x > slider.xMax) x = slider.xMax // Limit horizontal movement
		if (x < 0) x = 0 // Limit horizontal movement
		/// changed by Sveta - moving relative to SliderSlit
		///if (y > slider.yMax) y = slider.yMax // Limit vertical movement
		///if (y < 0) y = 0 // Limit vertical movement
		if (y > slider.yMax) y = slider.yMax // Limit vertical movement
		if (y < slider.yZero) y = slider.yZero // Limit vertical movement
		carpeLeft(slider.id, x)  // move slider to new horizontal position
		carpeTop(slider.id, y) // move slider to new vertical position
		var sliderVal = x + (y - slider.yZero); // pixel value of slider regardless of orientation
		var display = sliderCombo.display;
		var sliderPos = (slider.distance / display.valuecount) * 
			Math.round(display.valuecount * sliderVal / slider.distance)
		var v = Math.round((sliderPos * slider.scale + slider.from) * // calculate display value
			Math.pow(10, display.decimals)) / Math.pow(10, display.decimals)
		
		if (display.value != v)
		{
			display.value = v // put the new value in the slider display element
			onSliderChange(display);
		}

		return false
	}
	return
}
// slide: Handles the start of a slider move.
function slide(evnt)
{
	if (!evnt) evnt = window.event; // Get the mouse event causing the slider activation.
	var elmnt = (evnt.target) ? evnt.target : evnt.srcElement; // Get the activated slider element.

	var slider = getSliderCombo(elmnt.id).slider;

	/// not move sliders with one value	
	if (slider.scale == 0){
		return false;
		}
	slider.startOffsetX = carpeLeft(slider.id) - evnt.screenX // Slider-mouse horizontal offset at start of slide.
	slider.startOffsetY = carpeTop(slider.id) - evnt.screenY // Slider-mouse vertical offset at start of slide.
	mouseover = true
	currSliderId = slider.id;
	document.onmousemove = moveSlider // Start the action if the mouse is dragged.
	document.onmouseup = sliderMouseUp // Stop sliding.
	return false
}
// sliderMouseUp: Handles the mouseup event after moving a slider.
// Snaps the slider position to allowed/displayed value. 
function sliderMouseUp()
{
	if (mouseover) {
		var sliderCombo = getSliderCombo(currSliderId);
		var slider = sliderCombo.slider;
		var display = sliderCombo.display;
			
		var v = (display.value) ? display.value : 0 // Find last display value.
		var pos = (v - slider.from)/(slider.scale) // Calculate slider position (regardless of orientation).

		if (slider.orientation == 'horizontal') {
			pos = (pos > slider.xMax) ? slider.xMax : pos
			pos = (pos < 0) ? 0 : pos
			carpeLeft(slider.id, pos) // Snap horizontal slider to corresponding display position.
		}
		if (slider.orientation == 'vertical') {
			pos = (pos > slider.yMax) ? slider.yMax : pos
			pos = (pos < 0) ? 0 : pos
			carpeTop(slider.id, pos) // Snap vertical slider to corresponding display position.
		}
		if (document.removeEventListener) { // Remove event listeners from 'document' (W3C).
			document.removeEventListener('mousemove', moveSlider, false)
			document.removeEventListener('mouseup', sliderMouseUp, false)
		}
		else if (document.detachEvent) { // Remove event listeners from 'document' (IE).
			document.detachEvent('onmousemove', moveSlider)
			document.detachEvent('onmouseup', sliderMouseUp)
		}

		/// added by Sveta
		/// to handle slider onchange event
		onSliderChange(display);
		/// ---
	}
	mouseover = false // Stop the sliding.
}
function focusDisplay(evnt)
{
	if (!evnt) evnt = window.event; // Get the mouse event causing the display activation.
	var display = (evnt.target) ? evnt.target : evnt.srcElement; // Get the activated display element.
	var lock = display.getAttribute('typelock') // Is the user allowed to type into the display?
	if (lock == 'on') {
		display.blur()
	}
	return
}
window.onload = function() // Set up the sliders and the displays.
{
	// added by Sveta
	// sets slider's display attribute
	setSliderDisplays()

	var sliders = carpeGetElementsByClass(carpeSliderClassName) // Find the horizontal sliders.
	var displayId, display;
	for (i = 0; i < sliders.length; i++) {
		sliders[i].onmousedown = slide // Attach event listener.
		
		// added by Sveta
		// set position from display.value
		displayId = sliders[i].getAttribute('display') // ID of associated display element.
		display = document.getElementById(displayId) // Get the associated display element.
		setSliderPos(sliders[i].id, display.value);
	}
	var displays = carpeGetElementsByClass(carpeSliderDisplayClassName) // Find the displays.
	for (i = 0; i < displays.length; i++) {
		displays[i].onfocus = focusDisplay // Attach event listener.
	}
}

// added by Sveta
// to correct sliders position when resizing
window.onresize = function() // Set up the sliders and the displays.
{
	//alert('onresize');
	var sliders = carpeGetElementsByClass(carpeSliderClassName) // Find the horizontal sliders.
	for (i = 0; i < sliders.length; i++) {
		sliders[i].style.position = "static";
		sliders[i].style.position = "";
	}
}

// added by Sveta
// attach events, set position for dinamically created slider
function activateSlider(sliderId, value)
{
	var slider = document.getElementById(sliderId);
	slider.onmousedown = slide // Attach event listener.
	var displayId = slider.getAttribute('display') // ID of associated display element.
	var display = document.getElementById(displayId) // Get the associated display element.
	display.onfocus = focusDisplay // Attach event listener.
	setSliderPos(sliderId, value);
}

// added by Sveta
// setSliderPos: move slider according to new value
// (!возомжность использовать числа с дробной частью не учитывалась --> надо доделать, если понадобится!) 
// (!вертикальные слайдеры не проверялись!) 
// (?проверять что значение может быть установлено у слайдера?)
function setSliderPos(sliderId, value)
{
	var sliderCombo = getSliderCombo(sliderId);
	var slider = sliderCombo.slider;

	/// calculate position
	if (slider.scale == 0)
		slider.pos = 0; // left or right??
	else
		slider.pos = Math.round((value - slider.from)/slider.scale);
	//alert('from: '+slider.from+'\nto: '+to+'\nvalue: '+display.value+'\npos: '+slider.pos);
	if (slider.orientation == 'vertical')
		carpeTop(sliderId, slider.pos)  // move slider to new vertical position
	else
	{
		carpeLeft(sliderId, slider.pos)  // move slider to new horizontal position
		carpeTop(sliderId, slider.yZero)  // move slider to new vertical position
	}
}

// added by Sveta
// getSlider: return slider and display objects
function getSliderCombo(sliderId)
{
	var slider = document.getElementById(sliderId);
	/// --- get slider's properties
	var dist = parseInt(slider.getAttribute('distance')) // The allowed slider movement in pixels.
	slider.distance = dist ? dist : carpeDefaultSliderLength // Deafault distance from global var.
	var ori = slider.getAttribute('orientation') // Slider orientation: 'horizontal' or 'vertical'.
	slider.orientation = ((ori == 'horizontal') || (ori == 'vertical')) ? ori : carpeSliderDefaultOrientation
		// Default orientation from global variable.
	var displayId = slider.getAttribute('display') // ID of associated display element.
	var display = document.getElementById(displayId) // Get the associated display element.
	display.sliderId = slider.id // Associate the display with the correct slider.
	var dec = parseInt(display.getAttribute('decimals')) // Number of decimals to be displayed.
	display.decimals = dec ? dec : 0 // Default number of decimals: 0.
	var val = parseInt(display.getAttribute('valuecount'))  // Allowed number of values in the interval.
	display.valuecount = val ? val : slider.distance + 1 // Default number of values: the sliding distance.
	var from = parseFloat(display.getAttribute('from')) // Min/start value for the display.
	from = from ? from : 0 // Default min/start value: 0.
	var to = parseFloat(display.getAttribute('to')) // Max value for the display.
	to = to ? to : slider.distance // Default number of values: the sliding distance.
	slider.scale = (to - from) / slider.distance // Slider-display scale [value-change per pixel of movement].
	if (slider.orientation == 'vertical') { // Set limits and scale for vertical sliders.
		slider.from = to // Invert for vertical sliders. "Higher is more."
		slider.xMax = 0
		slider.yMax = slider.distance
		slider.scale = -slider.scale // Invert scale for vertical sliders. "Higher is more."
		slider.yZero = 0;
	}
	else { // Set limits for horizontal sliders.
		slider.from = from
		slider.xMax = slider.distance
		// added by Sveta: y=zero coordinate
		slider.yZero = - Math.round(slider.clientHeight/2+2);
		slider.yMax = slider.yZero;
	}
	return {slider: slider, display: display}
}