fineui/uidoc/core/layout/float_center.md

# bi.float_center

#### 浮动布局实现的居中容器

{% method %}
[source](https://jsfiddle.net/fineui/8fd2nvkm/)

{% common %}
```javascript
Demo = {};
Demo.CenterLayout = BI.inherit(BI.Widget, {
    props: {
        baseCls: "demo-center"
    },
    render: function () {
        return {
            type: "bi.center",
            items: [{
                type: "bi.label",
                text: "Center 1，这里虽然设置label的高度30，但是最终影响高度的是center布局",
                cls: "layout-bg1",
                whiteSpace: "normal"
            },{
                type: "bi.label",
                text: "Center 2，为了演示label是占满整个的，用了一个whiteSpace:normal",
                cls: "layout-bg2",
                whiteSpace: "normal"
            },{
                type: "bi.label",
                text: "Center 3",
                cls: "layout-bg3"
            },{
                type: "bi.label",
                text: "Center 4",
                cls: "layout-bg5"
            }],
            height: 300,
            hgap: 20,
            vgap: 20
        }
    }
});
BI.shortcut("demo.center_layout", Demo.CenterLayout);
BI.createWidget({
  type: 'demo.center_layout',
  element: "#wrapper",
});


```

{% endmethod %}


## API
##### 基础属性
| 参数    | 说明                           | 类型       | 可选值 | 默认值
| :------ |:-------------                  | :-----     | :----|:----
| hgap    | 效果相当于容器左右padding值    |    number  |  |  0  |
| vgap    | 效果相当于容器上下padding值    |    number  |  |  0  |
| lgap    | 效果相当于容器left-padding值   |    number  |  |  0  |
| rgap    | 效果相当于容器right-padding值  |    number  |  |  0  |
| tgap    | 效果相当于容器top-padding值    |    number  |  |  0  |
| bgap    | 效果相当于容器bottom-padding值 |    number  |  |  0  |
| items | 子控件数组     |    array |  |  | 

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