JavaScript method to realize proportional dragging and scaling of selection box

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JavaScript method to realize proportional dragging and scaling of selection box_javascript skills

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May 16, 2016 pm 03:47 PM

javascriptselection box

The example in this article describes the method of using JavaScript to realize proportional dragging and scaling of the selection box. Share it with everyone for your reference. The details are as follows:

Here, the effect of pulling out a selection box like PS can be achieved through javascript. Many of the methods in it are worth learning.

The operation effect is as shown below:

The specific code is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JavaScript拖拉缩放效果</title>
</head>
<body>
<script>
var isIE = (document.all) &#63; true : false;
var $ = function (id) {
  return "string" == typeof id &#63; 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) {
  var args = Array.prototype.slice.call(arguments).slice(2);
  return function(event) {
    return fun.apply(object, [event || window.event].concat(args));
  }
}
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;
 }
};
//缩放程序
var Resize = Class.create();
Resize.prototype = {
//缩放对象
initialize: function(obj, options) {
  this._obj = $(obj);//缩放对象  
  this._styleWidth = this._styleHeight = this._styleLeft = this._styleTop = 0;//样式参数
  this._sideRight = this._sideDown = this._sideLeft = this._sideUp = 0;//坐标参数
  this._fixLeft = this._fixTop = 0;//定位参数
  this._scaleLeft = this._scaleTop = 0;//定位坐标
  this._mxSet = function(){};//范围设置程序
  this._mxRightWidth = this._mxDownHeight = this._mxUpHeight = this._mxLeftWidth = 0;//范围参数
  this._mxScaleWidth = this._mxScaleHeight = 0;//比例范围参数
  this._fun = function(){};//缩放执行程序
  //获取边框宽度
  var _style = CurrentStyle(this._obj);
  this._borderX = (parseInt(_style.borderLeftWidth) || 0) + (parseInt(_style.borderRightWidth) || 0);
  this._borderY = (parseInt(_style.borderTopWidth) || 0) + (parseInt(_style.borderBottomWidth) || 0);
  //事件对象(用于绑定移除事件)
  this._fR = BindAsEventListener(this, this.Resize);
  this._fS = Bind(this, this.Stop);
  this.SetOptions(options);
  //范围限制
  this.Max = !!this.options.Max;
  this._mxContainer = $(this.options.mxContainer) || null;
  this.mxLeft = Math.round(this.options.mxLeft);
  this.mxRight = Math.round(this.options.mxRight);
  this.mxTop = Math.round(this.options.mxTop);
  this.mxBottom = Math.round(this.options.mxBottom);
  //宽高限制
  this.Min = !!this.options.Min;
  this.minWidth = Math.round(this.options.minWidth);
  this.minHeight = Math.round(this.options.minHeight);
  //按比例缩放
  this.Scale = !!this.options.Scale;
  this.Ratio = Math.max(this.options.Ratio, 0);
  this.onResize = this.options.onResize;
  this._obj.style.position = "absolute";
  !this._mxContainer || CurrentStyle(this._mxContainer).position == "relative" || (this._mxContainer.style.position = "relative");
 },
 //设置默认属性
 SetOptions: function(options) {
 this.options = {//默认值
    Max:    false,//是否设置范围限制(为true时下面mx参数有用)
    mxContainer:"",//指定限制在容器内
    mxLeft:    0,//左边限制
    mxRight:  9999,//右边限制
    mxTop:    0,//上边限制
    mxBottom:  9999,//下边限制
    Min:    false,//是否最小宽高限制(为true时下面min参数有用)
    minWidth:  50,//最小宽度
    minHeight:  50,//最小高度
    Scale:    false,//是否按比例缩放
    Ratio:    0,//缩放比例(宽/高)
    onResize:  function(){}//缩放时执行
 };
 Extend(this.options, options || {});
 },
 //设置触发对象
 Set: function(resize, side) {
  var resize = $(resize), fun;
  if(!resize) return;
  //根据方向设置
  switch (side.toLowerCase()) {
  case "up" :
    fun = this.Up;
    break;
  case "down" :
    fun = this.Down;
    break;
  case "left" :
    fun = this.Left;
    break;
  case "right" :
    fun = this.Right;
    break;
  case "left-up" :
    fun = this.LeftUp;
    break;
  case "right-up" :
    fun = this.RightUp;
    break;
  case "left-down" :
    fun = this.LeftDown;
    break;
  case "right-down" :
  default :
    fun = this.RightDown;
  };
  //设置触发对象
  addEventHandler(resize, "mousedown", BindAsEventListener(this, this.Start, fun));
 },
 //准备缩放
 Start: function(e, fun, touch) {  
  //防止冒泡(跟拖放配合时设置)
  e.stopPropagation &#63; e.stopPropagation() : (e.cancelBubble = true);
  //设置执行程序
  this._fun = fun;
  //样式参数值
  this._styleWidth = this._obj.clientWidth;
  this._styleHeight = this._obj.clientHeight;
  this._styleLeft = this._obj.offsetLeft;
  this._styleTop = this._obj.offsetTop;
  //四条边定位坐标
  this._sideLeft = e.clientX - this._styleWidth;
  this._sideRight = e.clientX + this._styleWidth;
  this._sideUp = e.clientY - this._styleHeight;
  this._sideDown = e.clientY + this._styleHeight;
  //top和left定位参数
  this._fixLeft = this._styleLeft + this._styleWidth;
  this._fixTop = this._styleTop + this._styleHeight;
  //缩放比例
  if(this.Scale){
    //设置比例
    this.Ratio = Math.max(this.Ratio, 0) || this._styleWidth / this._styleHeight;
    //left和top的定位坐标
    this._scaleLeft = this._styleLeft + this._styleWidth / 2;
    this._scaleTop = this._styleTop + this._styleHeight / 2;
  };
  //范围限制
  if(this.Max){
    //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);
    };
    //根据最小值再修正
    mxRight = Math.max(mxRight, mxLeft + (this.Min &#63; this.minWidth : 0) + this._borderX);
    mxBottom = Math.max(mxBottom, mxTop + (this.Min &#63; this.minHeight : 0) + this._borderY);
    //由于转向时要重新设置所以写成function形式
    this._mxSet = function(){
      this._mxRightWidth = mxRight - this._styleLeft - this._borderX;
      this._mxDownHeight = mxBottom - this._styleTop - this._borderY;
      this._mxUpHeight = Math.max(this._fixTop - mxTop, this.Min &#63; this.minHeight : 0);
      this._mxLeftWidth = Math.max(this._fixLeft - mxLeft, this.Min &#63; this.minWidth : 0);
    };
    this._mxSet();
    //有缩放比例下的范围限制
    if(this.Scale){
      this._mxScaleWidth = Math.min(this._scaleLeft - mxLeft, mxRight - this._scaleLeft - this._borderX) * 2;
      this._mxScaleHeight = Math.min(this._scaleTop - mxTop, mxBottom - this._scaleTop - this._borderY) * 2;
    };
  };
  //mousemove时缩放 mouseup时停止
  addEventHandler(document, "mousemove", this._fR);
  addEventHandler(document, "mouseup", this._fS);
  if(isIE){
    addEventHandler(this._obj, "losecapture", this._fS);
    this._obj.setCapture();
  }else{
    addEventHandler(window, "blur", this._fS);
    e.preventDefault();
  };
 },
 //缩放
 Resize: function(e) {
  //清除选择
  window.getSelection &#63; window.getSelection().removeAllRanges() : document.selection.empty();
  //执行缩放程序
  this._fun(e);
  //设置样式，变量必须大于等于0否则ie出错
  with(this._obj.style){
    width = this._styleWidth + "px"; height = this._styleHeight + "px";
    top = this._styleTop + "px"; left = this._styleLeft + "px";
  }
  //附加程序
  this.onResize();
 },
 //缩放程序
 //上
 Up: function(e) {
  this.RepairY(this._sideDown - e.clientY, this._mxUpHeight);
  this.RepairTop();
  this.TurnDown(this.Down);
 },
 //下
 Down: function(e) {
  this.RepairY(e.clientY - this._sideUp, this._mxDownHeight);
  this.TurnUp(this.Up);
 },
 //右
 Right: function(e) {
  this.RepairX(e.clientX - this._sideLeft, this._mxRightWidth);
  this.TurnLeft(this.Left);
 },
 //左
 Left: function(e) {
  this.RepairX(this._sideRight - e.clientX, this._mxLeftWidth);
  this.RepairLeft();
  this.TurnRight(this.Right);
 },
 //右下
 RightDown: function(e) {
  this.RepairAngle(
    e.clientX - this._sideLeft, this._mxRightWidth,
    e.clientY - this._sideUp, this._mxDownHeight
  );
  this.TurnLeft(this.LeftDown) || this.Scale || this.TurnUp(this.RightUp);
 },
 //右上
 RightUp: function(e) {
  this.RepairAngle(
    e.clientX - this._sideLeft, this._mxRightWidth,
    this._sideDown - e.clientY, this._mxUpHeight
  );
  this.RepairTop();
  this.TurnLeft(this.LeftUp) || this.Scale || this.TurnDown(this.RightDown);
 },
 //左下
 LeftDown: function(e) {
  this.RepairAngle(
    this._sideRight - e.clientX, this._mxLeftWidth,
    e.clientY - this._sideUp, this._mxDownHeight
  );
  this.RepairLeft();
  this.TurnRight(this.RightDown) || this.Scale || this.TurnUp(this.LeftUp);
 },
 //左上
 LeftUp: function(e) {
  this.RepairAngle(
    this._sideRight - e.clientX, this._mxLeftWidth,
    this._sideDown - e.clientY, this._mxUpHeight
  );
  this.RepairTop(); this.RepairLeft();
  this.TurnRight(this.RightUp) || this.Scale || this.TurnDown(this.LeftDown);
 },
 //水平方向
 RepairX: function(iWidth, mxWidth) {
  iWidth = this.RepairWidth(iWidth, mxWidth);
  if(this.Scale){
    var iHeight = this.RepairScaleHeight(iWidth);
    if(this.Max && iHeight > this._mxScaleHeight){
      iHeight = this._mxScaleHeight;
      iWidth = this.RepairScaleWidth(iHeight);
    }else if(this.Min && iHeight < this.minHeight){
      var tWidth = this.RepairScaleWidth(this.minHeight);
      if(tWidth < mxWidth){ iHeight = this.minHeight; iWidth = tWidth; }
    }
    this._styleHeight = iHeight;
    this._styleTop = this._scaleTop - iHeight / 2;
  }
  this._styleWidth = iWidth;
 },
 //垂直方向
 RepairY: function(iHeight, mxHeight) {
  iHeight = this.RepairHeight(iHeight, mxHeight);
  if(this.Scale){
    var iWidth = this.RepairScaleWidth(iHeight);
    if(this.Max && iWidth > this._mxScaleWidth){
      iWidth = this._mxScaleWidth;
      iHeight = this.RepairScaleHeight(iWidth);
    }else if(this.Min && iWidth < this.minWidth){
      var tHeight = this.RepairScaleHeight(this.minWidth);
      if(tHeight < mxHeight){ iWidth = this.minWidth; iHeight = tHeight; }
    }
    this._styleWidth = iWidth;
    this._styleLeft = this._scaleLeft - iWidth / 2;
  }
  this._styleHeight = iHeight;
 },
 //对角方向
 RepairAngle: function(iWidth, mxWidth, iHeight, mxHeight) {
  iWidth = this.RepairWidth(iWidth, mxWidth);  
  if(this.Scale){
    iHeight = this.RepairScaleHeight(iWidth);
    if(this.Max && iHeight > mxHeight){
      iHeight = mxHeight;
      iWidth = this.RepairScaleWidth(iHeight);
    }else if(this.Min && iHeight < this.minHeight){
      var tWidth = this.RepairScaleWidth(this.minHeight);
      if(tWidth < mxWidth){ iHeight = this.minHeight; iWidth = tWidth; }
    }
  }else{
    iHeight = this.RepairHeight(iHeight, mxHeight);
  }
  this._styleWidth = iWidth;
  this._styleHeight = iHeight;
 },
 //top
 RepairTop: function() {
  this._styleTop = this._fixTop - this._styleHeight;
 },
 //left
 RepairLeft: function() {
  this._styleLeft = this._fixLeft - this._styleWidth;
 },
 //height
 RepairHeight: function(iHeight, mxHeight) {
  iHeight = Math.min(this.Max &#63; mxHeight : iHeight, iHeight);
  iHeight = Math.max(this.Min &#63; this.minHeight : iHeight, iHeight, 0);
  return iHeight;
 },
 //width
 RepairWidth: function(iWidth, mxWidth) {
  iWidth = Math.min(this.Max &#63; mxWidth : iWidth, iWidth);
  iWidth = Math.max(this.Min &#63; this.minWidth : iWidth, iWidth, 0);
  return iWidth;
 },
 //比例高度
 RepairScaleHeight: function(iWidth) {
  return Math.max(Math.round((iWidth + this._borderX) / this.Ratio - this._borderY), 0);
 },
 //比例宽度
 RepairScaleWidth: function(iHeight) {
  return Math.max(Math.round((iHeight + this._borderY) * this.Ratio - this._borderX), 0);
 },
 //转向程序
 //转右
 TurnRight: function(fun) {
  if(!(this.Min || this._styleWidth)){
    this._fun = fun;
    this._sideLeft = this._sideRight;
    this.Max && this._mxSet();
    return true;
  }
 },
 //转左
 TurnLeft: function(fun) {
  if(!(this.Min || this._styleWidth)){
    this._fun = fun;
    this._sideRight = this._sideLeft;
    this._fixLeft = this._styleLeft;
    this.Max && this._mxSet();
    return true;
  }
 },
 //转上
 TurnUp: function(fun) {
  if(!(this.Min || this._styleHeight)){
    this._fun = fun;
    this._sideDown = this._sideUp;
    this._fixTop = this._styleTop;
    this.Max && this._mxSet();
    return true;
  }
 },
 //转下
 TurnDown: function(fun) {
  if(!(this.Min || this._styleHeight)){
    this._fun = fun;
    this._sideUp = this._sideDown;
    this.Max && this._mxSet();
    return true;
  }
 },
 //停止缩放
 Stop: function() {
  removeEventHandler(document, "mousemove", this._fR);
  removeEventHandler(document, "mouseup", this._fS);
  if(isIE){
    removeEventHandler(this._obj, "losecapture", this._fS);
    this._obj.releaseCapture();
  }else{
    removeEventHandler(window, "blur", this._fS);
  }
 }
};
</script>
<style type="text/css">
#rRightDown,#rLeftDown,#rLeftUp,#rRightUp,#rRight,#rLeft,#rUp,#rDown{
  position:absolute;
  background:#C00;
  width:7px;
  height:7px;
  z-index:5;
  font-size:0;
}
#rLeftDown,#rRightUp{cursor:ne-resize;}
#rRightDown,#rLeftUp{cursor:nw-resize;}
#rRight,#rLeft{cursor:e-resize;}
#rUp,#rDown{cursor:n-resize;}
#rLeftDown{left:-4px;bottom:-4px;}
#rRightUp{right:-4px;top:-4px;}
#rRightDown{right:-4px;bottom:-4px;background-color:#00F;}
#rLeftUp{left:-4px;top:-4px;}
#rRight{right:-4px;top:50%;margin-top:-4px;}
#rLeft{left:-4px;top:50%;margin-top:-4px;}
#rUp{top:-4px;left:50%;margin-left:-4px;}
#rDown{bottom:-4px;left:50%;margin-left:-4px;}
#bgDiv{width:600px; height:300px; border:10px solid #666666; position:relative;}
#dragDiv{border:1px solid #000000; width:100px; height:60px; top:50px; left:50px; background:#fff;}
</style>
<div id="bgDiv">
 <div id="dragDiv">
 <div id="rRightDown"> </div>
 <div id="rLeftDown"> </div>
 <div id="rRightUp"> </div>
 <div id="rLeftUp"> </div>
 <div id="rRight"> </div>
 <div id="rLeft"> </div>
 <div id="rUp"> </div>
 <div id="rDown"></div>
 </div>
</div>
<input id="idScale" type="button" value="设置比例" />
<input id="idMin" type="button" value="设置最小范围" />
<script>
var rs = new Resize("dragDiv", { Max: true, mxContainer: "bgDiv" });
rs.Set("rRightDown", "right-down");
rs.Set("rLeftDown", "left-down");
rs.Set("rRightUp", "right-up");
rs.Set("rLeftUp", "left-up");
rs.Set("rRight", "right");
rs.Set("rLeft", "left");
rs.Set("rUp", "up");
rs.Set("rDown", "down");
$("idScale").onclick = function(){
  if(rs.Scale){
    this.value = "设置比例";
    rs.Scale = false;
  }else{
    this.value = "取消比例";
    rs.Ratio = 0;
    rs.Scale = true;
  }
}
$("idMin").onclick = function(){
  if(rs.Min){
    this.value = "设置最小范围";
    rs.Min = false;
  }else{
    this.value = "取消最小范围";
    rs.Min = true;
  }
}
</script>
</body>
</html>

I hope this article will be helpful to everyone’s JavaScript programming design.

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