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File: structure.js
	// Delimit proposed values for handle positions.
	function getPositions ( a, b, delimit ) {

		// Add movement to current position.
		var c = a + b[0], d = a + b[1];

		// Only alter the other position on drag,
		// not on standard sliding.
		if ( delimit ) {
			if ( c < 0 ) {
				d += Math.abs(c);
			}
			if ( d > 100 ) {
				c -= ( d - 100 );
			}

			// Limit values to 0 and 100.
			return [limit(c), limit(d)];
		}

		return [c,d];
	}

	// Provide a clean event with standardized offset values.
	function fixEvent ( e, pageOffset ) {

		// Prevent scrolling and panning on touch events, while
		// attempting to slide. The tap event also depends on this.
		e.preventDefault();

		// Filter the event to register the type, which can be
		// touch, mouse or pointer. Offset changes need to be
		// made on an event specific basis.
		var touch = e.type.indexOf('touch') === 0,
			mouse = e.type.indexOf('mouse') === 0,
			pointer = e.type.indexOf('pointer') === 0,
			x,y, event = e;

		// IE10 implemented pointer events with a prefix;
		if ( e.type.indexOf('MSPointer') === 0 ) {
			pointer = true;
		}

		if ( touch ) {
			// noUiSlider supports one movement at a time,
			// so we can select the first 'changedTouch'.
			x = e.changedTouches[0].pageX;
			y = e.changedTouches[0].pageY;
		}

		pageOffset = pageOffset || getPageOffset();

		if ( mouse || pointer ) {
			x = e.clientX + pageOffset.x;
			y = e.clientY + pageOffset.y;
		}

		event.pageOffset = pageOffset;
		event.points = [x, y];
		event.cursor = mouse || pointer; // Fix #435

		return event;
	}

	// Append a handle to the base.
	function addHandle ( direction, index ) {

		var origin = document.createElement('div'),
			handle = document.createElement('div'),
			classModifier = [options.cssClasses.handleLower, options.cssClasses.handleUpper];

		if ( direction ) {
			classModifier.reverse();
		}

		addClass(handle, options.cssClasses.handle);
		addClass(handle, classModifier[index]);

		addClass(origin, options.cssClasses.origin);
		origin.appendChild(handle);

		return origin;
	}

	// Add the proper connection classes.
	function addConnection ( connect, target, handles ) {

		// Apply the required connection classes to the elements
		// that need them. Some classes are made up for several
		// segments listed in the class list, to allow easy
		// renaming and provide a minor compression benefit.
		switch ( connect ) {
			case 1:	addClass(target, options.cssClasses.connect);
					addClass(handles[0], options.cssClasses.background);
					break;
			case 3: addClass(handles[1], options.cssClasses.background);
					/* falls through */
			case 2: addClass(handles[0], options.cssClasses.connect);
					/* falls through */
			case 0: addClass(target, options.cssClasses.background);
					break;
		}
	}

	// Add handles to the slider base.
	function addHandles ( nrHandles, direction, base ) {

		var index, handles = [];

		// Append handles.
		for ( index = 0; index < nrHandles; index += 1 ) {

			// Keep a list of all added handles.
			handles.push( base.appendChild(addHandle( direction, index )) );
		}

		return handles;
	}

	// Initialize a single slider.
	function addSlider ( direction, orientation, target ) {

		// Apply classes and data to the target.
		addClass(target, options.cssClasses.target);

		if ( direction === 0 ) {
			addClass(target, options.cssClasses.ltr);
		} else {
			addClass(target, options.cssClasses.rtl);
		}

		if ( orientation === 0 ) {
			addClass(target, options.cssClasses.horizontal);
		} else {
			addClass(target, options.cssClasses.vertical);
		}

		var div = document.createElement('div');
		addClass(div, options.cssClasses.base);
		target.appendChild(div);
		return div;
	}