?/*
  By Hangring
  #2008.03.24#
  ---
  use list:
  > global.lib.js
  > node.lib.js
  > events.lib.js
  > node.lib.js
  > css.lib.js
  ---
  自定義的文件上傳控件
*/

function oFileUpload () {
    this.container = null;
    this.fileUpload = null;
    this.mouseMove = null;
    this.mouseOver = null;
    this.getOffset = null;
    this.reset = null;
    
    // 上傳框是否關(guān)閉
    this.Closed = true;
}

oFileUpload.prototype.Init = function () {
};

oFileUpload.prototype.Create = function () {
    var self = this;
    var c = this.container;
    var leaf = false;
    if (c) leaf = true;
    else c = this.container = oNode.CreateNode('div');
    c.style.overflow = 'hidden';

    var fu = this.fileUpload = oNode.CreateInput('file');
    fu.type = 'file';
    oNode.AddNode(fu, c);
    fu.style.position = 'relative';
    fu.style.visibility = 'hidden';
    CSS.SetAlpha(fu, 0);

    var W, H, w, h;
    var oX, oY, ox, oy;
    var _ox, _oy;
    var reset = this.Reset = function () {
        oX = oY = ox = oy = _ox = _oy = 0;
        W = 0, H = 0;
        fu.style.left = '0';
        fu.style.top = '0';
        this.getOffset();
    };
    var getOffset = this.getOffset = function  () {
        oX || (oX = Global.GetOffsetLeft(c));
        oY || (oY = Global.GetOffsetTop(c));
        ox || (ox = Global.GetOffsetLeft(fu));
        oy || (oy = Global.GetOffsetTop(fu));
        _ox || (_ox = ox - oX);
        _oy || (_oy = oy - oY);
        W || (W = c.offsetWidth);
        H || (H = c.offsetHeight);
        w || (w = fu.offsetWidth);
        h || (h = fu.offsetHeight);
    }
    var mouseMove = this.mouseMove = function (e) {
        var e_x = e.clientX + Global.GetScrollLeft();
        var e_y = e.clientY + Global.GetScrollTop();

        getOffset();

        if (e_x < oX || e_x > oX + W || e_y < oY || e_y > oY + H) {
            //fu.style.display = 'none';
            return;
        }
        fu.style.display = '';

        var x = e_x - ox;
        var y = e_y - oy;

        fu.style.top  = y - (h / 2)  + 'px';
        fu.style.left = x - (w - 30) + 'px';
    };
    var mouseOver = this.mouseOver = function () {
        fu.style.visibility = 'visible';
        if (oX != Global.GetOffsetLeft(c) || oY != Global.GetOffsetTop(c)) {
            oX = Global.GetOffsetLeft(c);
            oY = Global.GetOffsetTop(c);
            ox = oX + _ox;
            oy = oY + _oy;
        }
    };
    var mouseOut = this.mouseOut = function (e) {
        fu.style.visibility = 'hidden';
        var obj = $EO(e);
        var p = false;
        while (obj) {
            if (obj == c)  p = true;
            obj = obj.parentNode;
        }
        p || self.Reset();
    };
    Events.AttachEvent(c, 'mousemove', mouseMove);
    Events.AttachEvent(c, 'mouseover', mouseOver);
    Events.AttachEvent(c, 'mouseout', mouseOut);
    leaf && getOffset();

    var mouseClick = this.mouseClick = function (e) {
        self.Closed = false;
        self.Click(e);
    };
    Events.AttachEvent(fu, 'click', mouseClick);

    return c;
};

oFileUpload.prototype.Click = function (e) {};

oFileUpload.prototype.RemoveEvent = function () {
    Events.RemoveEvent(this.container, 'mousemove', this.mouseMove);
    Events.RemoveEvent(this.container, 'mouseover', this.mouseOver);
    Events.RemoveEvent(this.container, 'mouseout', this.mouseOut);
    Events.RemoveEvent(this.fileUpload, 'click', this.mouseClick);
};