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ASP.NET 控件开发系列之图片切换web控件

答案：
贴出来控件页面的代码. 
PicList.ascx 
复制代码 代码如下:
 
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="PicList.ascx.cs" Inherits="WebParts_PicList" %> 
<style type="text/css"> 
/* Reset style */ 
* 
{ 
margin: 0; 
padding: 0; 
word-break: break-all; 
} 
body 
{ 
background: #fff; 
color: #000000; 
font: 12px/1.6em Helvetica, Arial, sans-serif; 
margin-left: 0px; 
margin-top: 0px; 
margin-right: 0px; 
margin-bottom: 0px; 
} 
h1, h2, h3, h4, h5, h6 
{ 
font-size: 1em; 
} 
a 
{ 
color: #0287CA; 
text-decoration: none; 
} 
a:hover 
{ 
text-decoration: underline; 
} 
ul, li 
{ 
list-style: none; 
} 
fieldset, img 
{ 
border: none; 
} 
legend 
{ 
display: none; 
} 
em, strong, cite, th 
{ 
font-style: normal; 
font-weight: normal; 
} 
input, textarea, select, button 
{ 
font: 12px Helvetica, Arial, sans-serif; 
} 
table 
{ 
border-collapse: collapse; 
} 
html 
{ 
overflow: -moz-scrollbars-vertical; 
} 
/*Always show Firefox scrollbar*/ 
/* iFocus style */ 
#ifocus 
{ 
width: 650px; 
height: 245px; 
margin: 0px; 
border: 1px solid #DEDEDE; 
background: #F8F8F8; 
} 
#ifocus_pic 
{ 
display: inline; 
position: relative; 
float: left; 
width: 540px; 
height: 225px; 
overflow: hidden; 
margin: 10px 0 0 10px; 
} 
#ifocus_piclist 
{ 
position: absolute; 
} 
#ifocus_piclist li 
{ 
width: 550px; 
height: 225px; 
overflow: hidden; 
} 
#ifocus_piclist img 
{ 
width: 550px; 
height: 225px; 
} 
#ifocus_btn 
{ 
display: inline; 
float: right; 
width: 91px; 
margin: 9px 9px 0 0; 
} 
#ifocus_btn li 
{ 
width: 91px; 
height: 57px; 
cursor: pointer; 
opacity: 0.5; 
-moz-opacity: 0.5; 
filter: alpha(opacity=50); 
} 
#ifocus_btn img 
{ 
width: 75px; 
height: 45px; 
margin: 7px 0 0 11px; 
} 
#ifocus_btn .current 
{ 
background: url(img/ifocus_btn_bg.gif) no-repeat; 
opacity: 1; 
-moz-opacity: 1; 
filter: alpha(opacity=100); 
} 
#ifocus_opdiv 
{ 
position: absolute; 
left: 0; 
bottom: 0; 
width: 545px; 
height: 35px; 
background: #000; 
opacity: 0.5; 
-moz-opacity: 0.5; 
filter: alpha(opacity=50); 
} 
#ifocus_tx 
{ 
position: absolute; 
left: 8px; 
bottom: 8px; 
color: #FFF; 
} 
#ifocus_tx .normal 
{ 
display: none; 
} 
</style> 
<script type="text/javascript"> 
function $(id) { return document.getElementById(id); } 
function addLoadEvent(func){ 
var oldonload = window.onload; 
if (typeof window.onload != 'function') { 
window.onload = func; 
} else { 
window.onload = function(){ 
oldonload(); 
func(); 
} 
} 
} 
function moveElement(elementID,final_x,final_y,interval) { 
if (!document.getElementById) return false; 
if (!document.getElementById(elementID)) return false; 
var elem = document.getElementById(elementID); 
if (elem.movement) { 
clearTimeout(elem.movement); 
} 
if (!elem.style.left) { 
elem.style.left = "0px"; 
} 
if (!elem.style.top) { 
elem.style.top = "0px"; 
} 
var xpos = parseInt(elem.style.left); 
var ypos = parseInt(elem.style.top); 
if (xpos == final_x && ypos == final_y) { 
return true; 
} 
if (xpos < final_x) { 
var dist = Math.ceil((final_x - xpos)/10); 
xpos = xpos + dist; 
} 
if (xpos > final_x) { 
var dist = Math.ceil((xpos - final_x)/10); 
xpos = xpos - dist; 
} 
if (ypos < final_y) { 
var dist = Math.ceil((final_y - ypos)/10); 
ypos = ypos + dist; 
} 
if (ypos > final_y) { 
var dist = Math.ceil((ypos - final_y)/10); 
ypos = ypos - dist; 
} 
elem.style.left = xpos + "px"; 
elem.style.top = ypos + "px"; 
var repeat = "moveElement('"+elementID+"',"+final_x+","+final_y+","+interval+")"; 
elem.movement = setTimeout(repeat,interval); 
} 
function classNormal(iFocusBtnID,iFocusTxID){ 
var iFocusBtns= $(iFocusBtnID).getElementsByTagName('li'); 
var iFocusTxs = $(iFocusTxID).getElementsByTagName('li'); 
for(var i=0; i<iFocusBtns.length; i++) { 
iFocusBtns[i].className='normal'; 
iFocusTxs[i].className='normal'; 
} 
} 
function classCurrent(iFocusBtnID,iFocusTxID,n){ 
var iFocusBtns= $(iFocusBtnID).getElementsByTagName('li'); 
var iFocusTxs = $(iFocusTxID).getElementsByTagName('li'); 
iFocusBtns[n].className='current'; 
iFocusTxs[n].className='current'; 
} 
function iFocusChange() { 
if(!$('ifocus')) return false; 
$('ifocus').onmouseover = function(){atuokey = true}; 
$('ifocus').onmouseout = function(){atuokey = false}; 
var iFocusBtns = $('ifocus_btn').getElementsByTagName('li'); 
var listLength = iFocusBtns.length; 
iFocusBtns[0].onmouseover = function() { 
moveElement('ifocus_piclist',0,0,5); 
classNormal('ifocus_btn','ifocus_tx'); 
classCurrent('ifocus_btn','ifocus_tx',0); 
} 
if (listLength>=2) { 
iFocusBtns[1].onmouseover = function() { 
moveElement('ifocus_piclist',0,-225,5); 
classNormal('ifocus_btn','ifocus_tx'); 
classCurrent('ifocus_btn','ifocus_tx',1); 
} 
} 
if (listLength>=3) { 
iFocusBtns[2].onmouseover = function() { 
moveElement('ifocus_piclist',0,-450,5); 
classNormal('ifocus_btn','ifocus_tx'); 
classCurrent('ifocus_btn','ifocus_tx',2); 
} 
} 
if (listLength>=4) { 
iFocusBtns[3].onmouseover = function() { 
moveElement('ifocus_piclist',0,-675,5); 
classNormal('ifocus_btn','ifocus_tx'); 
classCurrent('ifocus_btn','ifocus_tx',3); 
} 
} 
} 
setInterval('autoiFocus()',3500); 
var atuokey = false; 
function autoiFocus() { 
if(!$('ifocus')) return false; 
if(atuokey) return false; 
var focusBtnList = $('ifocus_btn').getElementsByTagName('li'); 
var listLength = focusBtnList.length; 
for(var i=0; i<listLength; i++) { 
if (focusBtnList[i].className == 'current') var currentNum = i; 
} 
if (currentNum==0&&listLength!=1 ){ 
moveElement('ifocus_piclist',0,-225,5); 
classNormal('ifocus_btn','ifocus_tx'); 
classCurrent('ifocus_btn','ifocus_tx',1); 
} 
if (currentNum==1&&listLength!=2 ){ 
moveElement('ifocus_piclist',0,-450,5); 
classNormal('ifocus_btn','ifocus_tx'); 
classCurrent('ifocus_btn','ifocus_tx',2); 
} 
if (currentNum==2&&listLength!=3 ){ 
moveElement('ifocus_piclist',0,-675,5); 
classNormal('ifocus_btn','ifocus_tx'); 
classCurrent('ifocus_btn','ifocus_tx',3); 
} 
if (currentNum==3 ){ 
moveElement('ifocus_piclist',0,0,5); 
classNormal('ifocus_btn','ifocus_tx'); 
classCurrent('ifocus_btn','ifocus_tx',0); 
} 
if (currentNum==1&&listLength==2 ){ 
moveElement('ifocus_piclist',0,0,5); 
classNormal('ifocus_btn','ifocus_tx'); 
classCurrent('ifocus_btn','ifocus_tx',0); 
} 
if (currentNum==2&&listLength==3 ){ 
moveElement('ifocus_piclist',0,0,5); 
classNormal('ifocus_btn','ifocus_tx'); 
classCurrent('ifocus_btn','ifocus_tx',0); 
} 
} 
addLoadEvent(iFocusChange); 
</script> 
<div align="center"> 
<div id="ifocus"> 
<div id="ifocus_pic"> 
<div id="ifocus_piclist" style="left: 0; top: 0;"> 
<ul runat="server" id="ulImgBig"> 
</ul> 
</div> 
<div id="ifocus_opdiv"> 
</div> 
<div id="ifocus_tx"> 
<ul runat="server" id="urImgTitle"> 
</ul> 
</div> 
</div> 
<div id="ifocus_btn"> 
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