dragdrop.js

一个可以简单实现模块的拖曳、锁定、最大化、最小化控制的示例

		document.body.appendChild(iframe);
		document.body.appendChild(div);
		document.body.appendChild(wc.node);
	},
	
	close : function () {
	//关闭添加框
		var wc = this, div = wc.div, iframe = wc.iframe;
		document.getElementsByTagName("html")[0].style.overflow = CDrag.IE ? "" : "auto";
		document.body.removeChild(iframe);
		document.body.removeChild(div);
		document.body.removeChild(wc.node);
	}
	
};

CDrag.prototype = {
	
	initialize : function () {
	//初始化成员
		var wc = this;
		wc.table = new CDrag.Table; //建立表格对象
		wc.addc = new CDrag.Add(wc); //建立添加对象
		wc.iFunc = wc.eFunc = null;
		wc.obj = { on : { a : null, b : "" }, row : null, left : 0, top : 0 };
		wc.temp = { row : null, div : document.createElement("div") };
		wc.temp.div.setAttribute(CDrag.IE ? "className" : "class", "CDrag_temp_div");
		wc.temp.div.innerHTML = " ";
	},
	
	reMouse : function (a) {
	//获取鼠标位置
		var e = Object.reEvent();
		return {
			x : document.documentElement.scrollLeft + e.clientX,
			y : document.documentElement.scrollTop + e.clientY
		};
	},
	
	rePosition : function (o) {
	//获取元素绝对位置
		var $x = $y = 0;
		do {
			$x += o.offsetLeft;
			$y += o.offsetTop;
		} while ((o = o.offsetParent)); // && o.tagName != "BODY"
		return { x : $x, y : $y };
	},
	
	execMove : function (status, on_obj, in_obj, place) {
	//处理拖拽过程细节
		var wc = this, obj = wc.obj.on, temp = wc.temp, px;
		
		obj.a = on_obj, obj.b = status;
		
		if (place == 0) {
		//向上
			px = in_obj.element.clientWidth;
			in_obj.element.parentNode.insertBefore(temp.div, in_obj.element);
		} else if (place == 1) {
		//新加入
			px = in_obj.element.clientWidth - 2;
			in_obj.element.appendChild(temp.div);
		} else {
		//向下
			px = in_obj.element.clientWidth;
			in_obj.element.parentNode.appendChild(temp.div);
		}
		
		wc.obj.left = Math.ceil(px / temp.div.offsetWidth * wc.obj.left); //处理拖拽换行后宽度变化，鼠标距离拖拽物的距离的误差.
		temp.row.style.width = temp.div.style.width = px + "px"; //处理换列后对象宽度变化
	},
	
	sMove : function (o) {
	//当拖动开始时设置参数
		
		var wc = this;
		if (o.locks || wc.iFunc || wc.eFinc) return;
		
		var mouse = wc.reMouse(), obj = wc.obj, temp = wc.temp, div = o.element, position = wc.rePosition(div);
		
		obj.row = o;
		obj.on.b = "me";
		obj.left = mouse.x - position.x;
		obj.top = mouse.y - position.y;
		
		temp.row = document.body.appendChild(div.cloneNode(true)); //复制预拖拽对象
		temp.row.style.width = div.clientWidth + "px";
		
		with (temp.row.style) {
		//设置复制对象
			position = "absolute";
			left = mouse.x - obj.left + "px";
			top = mouse.y - obj.top + "px";
			zIndex = 100;
			opacity = "0.3";
			filter = "alpha(opacity:30)";
		}
		
		with (temp.div.style) {
		//设置站位对象
			height = div.clientHeight + "px";
			width = div.clientWidth + "px";
		}
		

		div.parentNode.replaceChild(temp.div, div);
		
		wc.iFunc = Object.addEvent(document, ["onmousemove"], wc.iMove.bind(wc));
		wc.eFunc = Object.addEvent(document, ["onmouseup"], wc.eMove.bind(wc));
		document.onselectstart = new Function("return false");
	},
	
	iMove : function () {
	//当鼠标移动时设置参数
		var wc = this, mouse = wc.reMouse(), cols = wc.table.items, obj = wc.obj, temp = wc.temp,
			row = obj.row, div = temp.row, t_position, t_cols, t_rows, i, j;
		
		with (div.style) {
			left = mouse.x - obj.left + "px";
			top = mouse.y - obj.top + "px";
		}
		
		for (i = 0 ; i < cols.length ; i ++) {
			t_cols = cols[i];
			//if (t_cols != obj.row.parent) continue;
			t_position = wc.rePosition(t_cols.element);
			if (t_position.x < mouse.x && t_position.x + t_cols.element.offsetWidth > mouse.x) {
				if (t_cols.items.length > 0) { //如果此列行数大于0
					if (t_cols.items[0] != obj.row && wc.rePosition(t_cols.items[0].element).y + 20 > mouse.y) {
						//如果第一行不为拖拽对象并且鼠标位置大于第一行的位置即是最上。。
						//向上
						wc.execMove("up", t_cols.items[0], t_cols.items[0], 0);
					} else if (t_cols.items.length > 1 && t_cols.items[0] == row &&
						wc.rePosition(t_cols.items[1].element).y + 20 > mouse.y) {
						//如果第一行是拖拽对象而第鼠标大于第二行位置则，没有动。。
						//向上
						wc.execMove("me", t_cols.items[1], t_cols.items[1], 0);
					} else {
						for (j = t_cols.items.length - 1 ; j > -1 ; j --) {
							//重最下行向上查询
							t_rows = t_cols.items[j];
							if (t_rows == obj.row) {
								if (t_cols.items.length == 1) {
								//如果拖拽的是此列最后一行
									wc.execMove("me", t_cols, t_cols, 1);
								}
								continue;
							}
							if (wc.rePosition(t_rows.element).y < mouse.y) {
								//如果鼠标大于这行则在这行下面
								if (t_rows.id + 1 < t_cols.items.length && t_cols.items[t_rows.id + 1] != obj.row) {
									//如果这行有下一行则重这行下一行的上面插入
									wc.execMove("down", t_rows, t_cols.items[t_rows.id + 1], 0);
								} else if (t_rows.id + 2 < t_cols.items.length) {
									//如果这行下一行是拖拽对象则插入到下两行，即拖拽对象返回原位
									wc.execMove("me", null, t_cols.items[t_rows.id + 2], 0);
								} else {
									//前面都没有满足则放在最低行
									wc.execMove("down", t_rows, t_rows, 2);
								}
								return;
							}
						}
					}
				} else {
				//此列无内容添加新行
					wc.execMove("new", t_cols, t_cols, 1);
				}
			}
		}
	},
	
	eMove : function () {
	//当鼠标释放时设置参数
		var wc = this, obj = wc.obj, temp = wc.temp, row = obj.row, div = row.element, o_cols, n_cols, number;
		
		if (obj.on.b != "me") {
			number = (obj.on.b == "down" ? obj.on.a.id + 1 : 0);
			n_cols = (obj.on.b != "new" ? obj.on.a.parent : obj.on.a);
			o_cols = obj.row.parent;
			n_cols.ins(number, o_cols.del(obj.row.id));
			
			wc.set_cookie();
		}
		
		temp.div.parentNode.replaceChild(div, temp.div);
		temp.row.parentNode.removeChild(temp.row);
		delete temp.row;
		
		Object.delEvent(document, ["onmousemove"], wc.iFunc);
		Object.delEvent(document, ["onmouseup"], wc.eFunc);
		document.onselectstart = wc.iFunc = wc.eFunc = null;
	},
	
	reduce : function (o) {
	//变大变小
		var wc = this;
		if ((o.window = (o.window == 1 ? 0 : 1))) {
			o.content.style.display = "block";
			o.reduce.innerHTML = "缩小";
		} else {
			o.content.style.display = "none";
			o.reduce.innerHTML = "放大";
		}
		wc.set_cookie();
	},
	
	lock : function (o) {
	//锁定
		var wc = this;
		if (o.locks) {
			o.locks = false;
			o.lock.innerHTML = "锁定";			
			alert("该板块已被锁定，您将不能进行移动、关闭操作。");
		} else {
			o.locks = true;
			o.lock.innerHTML = "解除";
			alert("该板块锁定被解除，您已可以进行移动、关闭操作。");
		}
		wc.set_cookie();
	},
	
	close : function (o) {
	//关闭对象
		var wc = this;
		wc.remove(o);
		wc.set_cookie();
	},
	
	remove : function (o) {
	//移除对象
		var wc = this, parent = o.parent;
		
		Object.delEvent(o.close, ["onclick"], o.closeFunc);
		if (o.editFunc) Object.delEvent(o.edit, ["onclick"], o.editFunc);
		Object.delEvent(o.lock, ["onclick"], o.lockFunc);
		Object.delEvent(o.reduce, ["onclick"], o.reduceFunc);
		Object.delEvent(o.title, ["onmousedown"], o.mousedown);
		
		o.mousedown = o.reduceFunc = o.lockFunc = o.editFunc = o.closeFunc = null;
		
		parent.element.removeChild(o.element);
		parent.del(o.id);
		delete wc.Class;
		delete o;
	},
	
	create_json : function () {
	//生成json串
		var wc = this, cols = wc.table.items, a = [], b = [], i, j, r;
		for (i = 0 ; i < cols.length ; i ++) {
			for (r = cols[i].items, j = 0 ; j < r.length ; j ++)
				b[b.length] = "{id:'" + r[j].root_id + "',window:" + r[j].window + ",locks:" + r[j].locks + "}";
			a[a.length] = "cols:'" + cols[i].element.id + "',rows:[" + b.splice(0, b.length).join(",") + "]";
		}
		//记录表格位置到Cookie中
		return escape("[{" + a.join("},{") + "}]");
	},
	
	parse_json : function (cookie) {
	//解释json成对象
		return eval("(" + cookie + ")");
	},
	get_cookie : function () {
	//获取COOKIE
		return (/CDrag=([^;]+)(?:;|$)/.exec(document.cookie) || [,])[1];
	},
	
	set_cookie : function () {
	//设置COOKIE
		var wc = this, date = new Date;
		//设置过期时限为一天
		date.setDate(date.getDate() + 1);
		document.cookie = "CDrag=" + wc.create_json() + ";expires=" + date.toGMTString();
	},
	
	del_cookie : function () {
	//删除COOKIE
		var wc = this, cookie = wc.get_cookie(), date;
		if (cookie) {
			date = new Date;
			date.setTime(date.getTime() - 1);
			document.cookie = "CDrag=" + cookie + ";expires=" + date.toGMTString();
		}
	},
	
	parse : function (o) {
	//初始化成员
		try {
			var wc = this, table = wc.table, cols, rows, div, i, j;
			for (i = 0 ; i < o.length ; i ++) {

				div = $(o[i].cols), cols = table.add(div);
				for (j = 0 ; j < o[i].rows.length ; j ++)
					wc.add(cols.add(o[i].rows[j].id, o[i].rows[j].window, o[i].rows[j].locks));
			}
		} catch (exp) {
			wc.del_cookie();
		}
	},
	
	add : function (o) {
	//添加对象
		var wc = this;
		o.mousedown = Object.addEvent(o.title, ["onmousedown"], o.lockF(wc, wc.sMove, o));
		o.reduceFunc = Object.addEvent(o.reduce, ["onclick"], o.lockF(wc, wc.reduce, o));
		o.lockFunc = Object.addEvent(o.lock, ["onclick"], wc.lock.bind(wc, o));
		o.closeFunc = Object.addEvent(o.close, ["onclick"], o.lockF(wc, wc.close, o));
	},
	
	append : function () {
		var wc = this;
		wc.addc.add();
	}
	
};