WebContent/resource/images/picsview/js/ntes_ui_scroll.js

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(function(window, undefined){
	
	var $ = window.NTES || {};
	if (!$.ui) {
		$.ui = {};
	}
	
	var scrollMode = {
		forward : function(lpf) {
			var t = this, pos = t._bPos - lpf;
			pos = (pos > 0 ? pos : 0);
			t._setPos(pos);
			(pos == 0 && t.stop());
		},
		backward : function(lpf) {
			var t = this, pos = t._bPos + lpf;
			pos = (pos < t._bRange ? pos : t._bRange);
			t._setPos(pos);
			(pos == t._bRange && t.stop());
		}
	};
	
	$.ui.Scroll = function(body, axis, handle) {
		if (!arguments.length) {
			return;
		}
		
		var t = this;
		t.constructor = arguments.callee;
		
		t._axis = axis == 'y' ? 'y' : 'x';
		t._fix = t._axis == 'x' ? {
			pos: 'left',
			offsetSize: 'offsetWidth',
			pageAxis: 'pageX',
			offsetPos: 'offsetLeft',
			scrollPos: 'scrollLeft'
		} :	{
			pos: 'top',
			offsetSize: 'offsetHeight',
			pageAxis: 'pageY',
			offsetPos: 'offsetTop',
			scrollPos: 'scrollTop'
		};
		
		t.fps = 13;
		t.lpf = 10;
		t.speed = 40;
		
		t._body = body;
		t._bCnt = body.parentNode;
		t._bPos = 0;
		t._bRange = Math.max(0, t._body[t._fix.offsetSize] - t._bCnt[t._fix.offsetSize]);
			
		if(handle !== undefined){
			t._handle = handle;
			t._hCnt = handle.parentNode;
			t._hPos = 0;
			t._hRange = Math.max(0, t._hCnt[t._fix.offsetSize] - t._handle[t._fix.offsetSize]);