拖放源码保存

程序员文章站 2022-07-15 10:20:30
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<html>   
  <head>   
  <title>拖放效果</title>   
  <style>   
  #idContainer{ 
      border:10px 
      solid #990000; 
      width:600px; 
      height:300px;
  }   
  #idDrag{ 
      border:5px solid #C4E3FD; 
      background:#C4E3FD; 
      width:50px; 
      height:50px;
      margin:50px;
  }   
  #idHandle{
      cursor:move; 
      height:25px; 
      background:#0000FF; 
      overflow:hidden;
  }   
  </style>   
  </head>   
  <body>   
  <script>   
  var isIE = (document.all) ? true : false; 
    
  var $ = function (id) 
  {   
      return "string" == typeof id ? document.getElementById(id) : id;   
  };  
   
  var Class = {   
      create: function() 
              {   
                  return function() 
                  { 
                     this.initialize.apply(this, arguments); 
                  }   
              }   
  }   
  
  var Extend = function(destination, source) 
  {   
      for (var property in source) 
      {   
          destination[property] = source[property];   
      }   
  }   
  
  var Bind = function(object, fun) 
  {   
      return function() 
      {   
          return fun.apply(object, arguments);   
      }   
  }   
  
  var BindAsEventListener = function(object, fun) 
  {   
      return function(event) 
      {   
          return fun.call(object, (event || window.event));   
      }   
  }  
   
  var CurrentStyle = function(element)
  {   
      return element.currentStyle || document.defaultView.getComputedStyle(element, null);   
  }   
  
  function addEventHandler(oTarget, sEventType, fnHandler) 
  {   
      if (oTarget.addEventListener) 
      {   
          oTarget.addEventListener(sEventType, fnHandler, false);   
      } 
      else if (oTarget.attachEvent) 
      {   
          oTarget.attachEvent("on" + sEventType, fnHandler);   
      } 
      else 
      {   
          oTarget["on" + sEventType] = fnHandler;   
      }   
  };   
  
  function removeEventHandler(oTarget, sEventType, fnHandler) 
  {   
      if (oTarget.removeEventListener) 
      {   
          oTarget.removeEventListener(sEventType, fnHandler, false);   
      } 
      else if (oTarget.detachEvent) 
      {   
          oTarget.detachEvent("on" + sEventType, fnHandler);   
      } 
      else 
      {    
        oTarget["on" + sEventType] = null;   
      }   
  };   
  //拖放程序   
  var Drag = Class.create();   
  Drag.prototype = {   
      //拖放对象   
      initialize: function(drag, options) 
      {   
          this.Drag = $(drag);//拖放对象   
          this._x = this._y = 0;//记录鼠标相对拖放对象的位置   
          this._marginLeft = this._marginTop = 0;//记录margin   
          //事件对象(用于绑定移除事件)   
          this._fM = BindAsEventListener(this, this.Move);   
          this._fS = Bind(this, this.Stop);   
          this.SetOptions(options);   
          this.Limit = !!this.options.Limit;   
          this.mxLeft = parseInt(this.options.mxLeft);   
          this.mxRight = parseInt(this.options.mxRight);   
          this.mxTop = parseInt(this.options.mxTop);   
          this.mxBottom = parseInt(this.options.mxBottom);   
          this.LockX = !!this.options.LockX;   
          this.LockY = !!this.options.LockY;   
          this.Lock = !!this.options.Lock;   
          this.onStart = this.options.onStart;   
          this.onMove = this.options.onMove;   
          this.onStop = this.options.onStop;   
          this._Handle = $(this.options.Handle) || this.Drag;   
          this._mxContainer = $(this.options.mxContainer) || null;   
          this.Drag.style.position = "absolute";   
          //透明   
          if(isIE && !!this.options.Transparent)
          {   
              //填充拖放对象   
              with(this._Handle.appendChild(document.createElement("div")).style)
              {   
                  width = height = "100%"; backgroundColor = "#fff"; filter = "alpha(opacity:0)";   
              }   
          }   
          addEventHandler(this._Handle, "mousedown", BindAsEventListener(this, this.Start));   
      },   
      //设置默认属性   
      SetOptions: function(options) 
      {   
          this.options = 
          {
              //默认值   
              Handle:   "",//设置触发对象（不设置则使用拖放对象）   
              Limit:   false,//是否设置范围限制(为true时下面参数有用,可以是负数)   
              mxLeft:   0,//左边限制   
              mxRight:  9999,//右边限制   
              mxTop:   0,//上边限制   
              mxBottom:  9999,//下边限制   
              mxContainer: "",//指定限制在容器内   
              LockX:   false,//是否锁定水平方向拖放   
              LockY:   false,//是否锁定垂直方向拖放   
              Lock:   false,//是否锁定   
              Transparent: false,//是否透明   
              onStart:  function(){},//开始移动时执行   
              onMove:   function(){},//移动时执行   
              onStop:   function(){}//结束移动时执行   
         };   
         Extend(this.options, options || {});   
      },   
      //准备拖动   
      Start: function(oEvent) 
      {   
          if(this.Lock){ return; }   
          if(this.Limit)
          {   
              //修正错误范围参数   
              this.mxRight = Math.max(this.mxRight, this.mxLeft + this.Drag.offsetWidth);   
              this.mxBottom = Math.max(this.mxBottom, this.mxTop + this.Drag.offsetHeight);   
              //如果有容器必须设置position为relative来相对定位，并在获取offset之前设置   
              !this._mxContainer || CurrentStyle(this._mxContainer).position == "relative" || (this._mxContainer.style.position = "relative");   
          }   
          //记录鼠标相对拖放对象的位置   
          this._x = oEvent.clientX - this.Drag.offsetLeft;   
          this._y = oEvent.clientY - this.Drag.offsetTop;   
          //记录margin   
          this._marginLeft = parseInt(CurrentStyle(this.Drag).marginLeft) || 0;   
          this._marginTop = parseInt(CurrentStyle(this.Drag).marginTop) || 0;   
          //mousemove时移动 mouseup时停止   
          addEventHandler(document, "mousemove", this._fM);   
          addEventHandler(document, "mouseup", this._fS);   
          if(isIE)
          {   
              //焦点丢失   
              addEventHandler(this._Handle, "losecapture", this._fS);   
              //设置鼠标捕获   
              this._Handle.setCapture();   
          }
          else
          {   
              //焦点丢失   
              addEventHandler(window, "blur", this._fS);   
              //阻止默认动作   
              oEvent.preventDefault();   
          };   
          //附加程序   
          this.onStart();   
      },   
      //拖动   
      Move: function(oEvent) 
      {   
          //判断是否锁定   
          if(this.Lock){ this.Stop(); return; };   
          //清除选择   
          window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();   
          //设置移动参数   
          var iLeft = oEvent.clientX - this._x, iTop = oEvent.clientY - this._y;   
          //设置范围限制   
          if(this.Limit)
          {   
              //设置范围参数   
              var mxLeft = this.mxLeft, mxRight = this.mxRight, mxTop = this.mxTop, mxBottom = this.mxBottom;   
              //如果设置了容器，再修正范围参数   
              if(!!this._mxContainer)
              {   
                  mxLeft = Math.max(mxLeft, 0);   
                  mxTop = Math.max(mxTop, 0);   
                  mxRight = Math.min(mxRight, this._mxContainer.clientWidth);   
                  mxBottom = Math.min(mxBottom, this._mxContainer.clientHeight);   
              };   
              //修正移动参数   
              iLeft = Math.max(Math.min(iLeft, mxRight - this.Drag.offsetWidth), mxLeft);   
              iTop = Math.max(Math.min(iTop, mxBottom - this.Drag.offsetHeight), mxTop);   
          }   
          //设置位置，并修正margin   
          if(!this.LockX){ this.Drag.style.left = iLeft - this._marginLeft + "px"; }   
          if(!this.LockY){ this.Drag.style.top = iTop - this._marginTop + "px"; }   
          //附加程序   
          this.onMove();   
      },   
      //停止拖动   
      Stop: function() 
      {   
          //移除事件   
          removeEventHandler(document, "mousemove", this._fM);   
          removeEventHandler(document, "mouseup", this._fS);   
          if(isIE)
          {   
              removeEventHandler(this._Handle, "losecapture", this._fS);   
              this._Handle.releaseCapture();   
          }
          else
          {   
              removeEventHandler(window, "blur", this._fS);   
          };   
          //附加程序   
          this.onStop();   
      }   
  };   
  </script>   
  <div id="idContainer">   
  <div id="idDrag"><div id="idHandle"></div></div>   
  </div>   
  <input id="idReset" type="button" value="复位" />   
  <input id="idLock" type="button" value="锁定" />   
  <input id="idLockX" type="button" value="锁定水平" />   
  <input id="idLockY" type="button" value="锁定垂直" />   
  <input id="idLimit" type="button" value="范围锁定" />   
  <input id="idLimitOff" type="button" value="取消锁定" />   
  <br />   
  拖放状态：<span id="idShow">未开始</span>   
  <script>   
  var drag = new Drag("idDrag", 
  { mxContainer: "idContainer", Handle: "idHandle", Limit: true,   
  onStart: function(){ $("idShow").innerHTML = "开始拖放"; },   
  onMove: function(){ $("idShow").innerHTML = "left："+this.Drag.offsetLeft+"；top:"+this.Drag.offsetTop; },   
  onStop: function(){ $("idShow").innerHTML = "结束拖放"; }   
  });   
  $("idReset").onclick = function()
  {   
      drag.Limit = true;   
      drag.mxLeft = drag.mxTop = 0;   
      drag.mxRight = drag.mxBottom = 9999;   
      drag.LockX = drag.LockY = drag.Lock = false;   
  }   
  $("idLock").onclick = function(){ drag.Lock = true; }   
  $("idLockX").onclick = function(){ drag.LockX = true; }   
  $("idLockY").onclick = function(){ drag.LockY = true; }   
  $("idLimit").onclick = function(){  drag.mxRight = drag.mxBottom = 200; }   
  $("idLimitOff").onclick = function(){ drag.Limit = false; }   
  </script>   
  </body>   
</html>
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