原生UI 公有属性

# EasyClick 原生UI 公有属性 
说明：本章内容为公有属性说明。控件、布局中的公有属性解释。

# 公有属性补充
背景图
BackgroundDrawable 设置背景图效果，用js代码设置。
代码设置控件或布局的背景图不限于ImageView控件拥有图片属性。例子如下
```js
// res目录下读取图片资源
let background =ui.resResAsDrawable("ec.png");
// 设置背景图 不限于iv  是个view就可以
ui.iv.setBackgroundDrawable(background);
```

# 取消 所有的组件自带内边距
`padding` 属性 设置为`0dp`即可

# 属性解释

| Value             | Description  |
|:-------------------:|-------------------- |
| top  | Put the object at the top of its container, not changing its size.   将对象放在其容器的顶部，不改变其大小.    | Put the object at the bottom of its container, not changing its size.   将对象放在其容器的底部，不改变其大小.    |
| left  | Put the object at the left edge of its container, not changing its size.   将对象放在其容器的左侧，不改变其大小.   |
| right | Put the object at the right edge of its container, not changing its size.   将对象放在其容器的右侧，不改变其大小.  |
| center_vertical  | Place object in the vertical center of its container, not changing its size.   将对象纵向居中，不改变其大小.   垂直对齐方式：垂直方向上居中对齐。 |
| fill_vertical | Grow the vertical size of the object if needed so it completely fills its container.   必要的时候增加对象的纵向大小，以完全充满其容器.   垂直方向填充  |
| center_horizontal | Place object in the horizontal center of its container, not changing its size.   将对象横向居中，不改变其大小.   水平对齐方式：水平方向上居中对齐  |
| fill_horizontal  | Grow the horizontal size of the object if needed so it completely fills its container.   必要的时候增加对象的横向大小，以完全充满其容器.   水平方向填充  |
| center | Place the object in the center of its container in both the vertical and horizontal axis, not changing its size.   将对象横纵居中，不改变其大小. |
| fill | Grow the horizontal and vertical size of the object if needed so it completely fills its container. This is the default.   必要的时候增加对象的横纵向大小，以完全充满其容器.  |
| clip_vertical | Additional option that can be set to have the top and/or bottom edges of the child clipped to its container’s bounds. The clip is based on the vertical gravity: a top gravity clips the bottom edge, a bottom gravity clips the top edge, and neither clips both edges.   附加选项，用于按照容器的边来剪切对象的顶部和/或底部的内容. 剪切基于其纵向对齐设置：顶部对齐时，剪切底部；底部对齐时剪切顶部；除此之外剪切顶部和底部.  垂直方向裁剪   |
| clip_horizontal   | Additional option that can be set to have the left and/or right edges of the child clipped to its container’s bounds. The clip is based on the horizontal gravity: a left gravity clips the right edge, a right gravity clips the left edge, and neither clips both edges.   附加选项，用于按照容器的边来剪切对象的左侧和/或右侧的内容. 剪切基于其横向对齐设置：左侧对齐时，剪切右侧；右侧对齐时剪切左侧；除此之外剪切左侧和右侧.  水平方向裁剪 |

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