<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>慕课网-Resizable</title>
<style type="text/css">
body{margin:0px;padding:50px;font-size:14px;color:#333}
.panel{width:400px;height:240px;border:1px solid #ccc;position:relative;min-width:40px;min-height:24px;}
.panel .title{background:#eee;text-align:center;line-height:30px;border:1px solid #fff;font-weight:bold}
.ui-Resizable-r{position:absolute;right:0px;top:0px;width:10px;height:100%;cursor: e-resize;}
.ui-Resizable-b{position:absolute;right:0px;bottom:0px;width:100%;height:10px;cursor: s-resize;}
.ui-Resizable-rb{position:absolute;right:0px;bottom:0px;width:20px;height:20px;cursor: nw-resize;}
</style>
</head>
<body onselectstart="return false;">
<h1>慕课网案例特效：Resizable — 可调大小面板</h1>
<div class="panel" id="ui-Resizable" onselectstart="return false;" >
<div class="title" >Resizable Panel</div>
</div>
<script type="text/javascript">
// ctrl ：控制元素，panel ：面板 ， type 类型
var m_panel , m_ctrl , m_type ;
// move： 是否侦听鼠标移动，
// m_start_x： 鼠标相对ctrl元素的left、right
// m_to_x： 鼠标的新位置
var moving = 0 ,m_start_x = 0 , m_start_y = 0 , m_to_x = 0 , m_to_y = 0 ;
// 面板最小尺寸
var m_min_w = 100,m_min_h = 40;
// 在控制元素中按下
function on_mousedown( e , panel ,ctrl , type ){
var e = e || window.event;
// 计算出鼠标页面位置 和 当前元素位置的差 = 鼠标相对元素的位置
m_start_x = e.pageX - ctrl.offsetLeft;
m_start_y = e.pageY - ctrl.offsetTop;
m_panel = panel;
m_ctrl = ctrl;
m_type = type;
// 开始处理移动事件
moving = setInterval(on_move,10);
}
// 页面鼠标移动侦听处理
document.onmousemove = function( e ){
var e = window.event || e;
m_to_x = e.pageX;
m_to_y = e.pageY;
}
// 鼠标移动处理
function on_move(){
if(moving){
// 计算最小的 left 和 top （使panel的新大小不能小于自身的位置）
var min_left = m_panel.offsetLeft
var min_top = m_panel.offsetTop
var to_x = Math.max(min_left+ m_min_w,m_to_x - m_start_x) ;
var to_y = Math.max(min_top + m_min_h,m_to_y - m_start_y) ;
// 元素的新位置 = 鼠标新位置 - 鼠标相对元素的位置
switch( m_type ){
case 'r' :
m_ctrl.style.left = to_x + "px";
m_panel.style.width=grid_w+'px';
break;
case 'b' :
m_ctrl.style.top = to_y+ "px";
m_panel.style.height=grid_h+'px';
break;
case 'rb' :
m_ctrl.style.left =to_x + "px";
m_ctrl.style.top =to_y+ "px";
m_panel.style.width=grid_w+'px';
m_panel.style.height=grid_h+'px';
break;
}
}
}
// 鼠标弹起处理
document.onkeyup = document.onmouseup = function(e){
clearInterval(moving);
var cls = document.getElementsByClassName('ui-Resizable-ctrl');
for(var i=0;i<cls.length;i++){
cls[i].style.left = '';
cls[i].style.top = '';
}
}
// 设置某个面板支持调整大小
function Resizable( panelId ){
var panel = document.getElementById(panelId);
// 插入调整控制元素
var r = document.createElement("div");
var b = document.createElement("div");
var rb = document.createElement("div");
r.class = r.className = 'ui-Resizable-r ui-Resizable-ctrl';
b.class = b.className = 'ui-Resizable-b ui-Resizable-ctrl';
rb.class = rb.className = 'ui-Resizable-rb ui-Resizable-ctrl';
panel.appendChild(r);
panel.appendChild(b);
panel.appendChild(rb);
// 为调整控制元素设置拖拽处理
r.addEventListener('mousedown',function(e){
on_mousedown(e,panel,r,'r');
})
b.addEventListener('mousedown',function(e){
on_mousedown(e,panel,b,'b');
})
rb.addEventListener('mousedown',function(e){
on_mousedown(e,panel,rb,'rb');
})
}
Resizable('ui-Resizable');
</script>
</body>
</html>
