js玩具——UI组件：Mask 遮罩层

/*
*	遮罩层
*	author: 吴安国
* version: 1.0
*/
function Mask() {
this.mask = null;
}

Mask.isCreate = false;

/**
* 创建遮罩层
* @param opacity 透明度
*/
Mask.createMask = function(opacity) {
var frame = Frame.frame;

this.mask = new Panel();

if(!Mask.isCreate) {

this.mask.setOpacity(opacity);
Frame.zIndex++;
Mask.isCreate = true;
}

this.mask.setPosition("absolute");
this.mask.setZIndex(Frame.zIndex);

var frameSize = frame.getSize();

//var height = (frame.getSize().getHeight() - parseInt(margin.getInsetsTop()) * 2)/frame.getClientSize().getHeight() * 100 + "%";
this.mask.setSize(frameSize.getWidth(), frameSize.getHeight());

this.mask.setPoint(new Point(0, 0));

this.mask.setBackgroundColor(Color.WHITE);

frame.addView(this.mask);
};

/**
* 关闭遮罩层
*/
Mask.close = function() {
Frame.frame.removeView(this.mask);
Mask.isCreate = false;
};