//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 ? 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 ? this.minWidth : 0) + this._borderX);
mxBottom = Math.max(mxBottom, mxTop + (this.Min ? 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 ? this.minHeight : 0);
this._mxLeftWidth = Math.max(this._fixLeft - mxLeft, this.Min ? 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 ? 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);
},
//修正程序
//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 ? mxHeight : iHeight, iHeight);
iHeight = Math.max(this.Min ? this.minHeight : iHeight, iHeight, 0);
return iHeight;
},
//width
RepairWidth: function(iWidth, mxWidth) {
iWidth = Math.min(this.Max ? mxWidth : iWidth, iWidth);
iWidth = Math.max(this.Min ? 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);
}
}
};
