Class BasicLayout

BasicLayout 类根据其各个设置彼此独立地排列布局元素。 BasicLayout（也称为绝对布局）要求显式定位每个容器子代。可以使用子代的 x 和 y 属性，或使用约束来定位每个子代。

Version

Egret 2.4

Version

eui 1.0

Platform

Web

Include Example

extension/eui/layout/BasicLayoutExample.ts

Language

zh_CN

Hierarchy (View Summary)

LayoutBase
- BasicLayout

Index

Constructors

Properties

useVirtualLayout

Accessors

Methods

measure updateDisplayList setTypicalSize scrollPositionChanged clearVirtualLayoutCache elementAdded elementRemoved getElementIndicesInView

Constructors

constructor

new BasicLayout(): BasicLayout
构造函数。

Returns BasicLayout

Version
Egret 2.4

Version
eui 1.0

Platform
Web

Language
zh_CN
Overrides LayoutBase.constructor
- Defined in extension/eui/layouts/BasicLayout.ts:54

Properties

useVirtualLayout

useVirtualLayout: boolean

BasicLayout不支持虚拟布局，设置这个属性无效。

Version

Egret 2.4

Version

eui 1.0

Platform

Web

Language

zh_CN

Accessors

target

get target(): Group
此布局将测量其元素、调整其元素的大小并定位其元素的 Group 容器。

Returns Group

Version
Egret 2.4

Version
eui 1.0

Platform
Web

Language
zh_CN
Inherited from LayoutBase.target
- Defined in extension/eui/layouts/supportClasses/LayoutBase.ts:78
set target(value: Group): void
Parameters
- value: Group
Returns void
Inherited from LayoutBase.target
- Defined in extension/eui/layouts/supportClasses/LayoutBase.ts:82

Methods

measure

measure(): void
基于目标的内容测量其默认大小

Returns void

Version
Egret 2.4

Version
eui 1.0

Platform
Web

Language
zh_CN
Overrides LayoutBase.measure
- Defined in extension/eui/layouts/BasicLayout.ts:83

updateDisplayList

updateDisplayList(unscaledWidth: number, unscaledHeight: number): void
调整目标的元素的大小并定位这些元素。
Parameters
- unscaledWidth: number
- unscaledHeight: number
Returns void

Version
Egret 2.4

Version
eui 1.0

Platform
Web

Language
zh_CN
Overrides LayoutBase.updateDisplayList
- Defined in extension/eui/layouts/BasicLayout.ts:95

setTypicalSize

setTypicalSize(width: number, height: number): void
设置一个典型元素的大小
Parameters
- width: number
  元素的宽
- height: number
  元素的高
Returns void

Version
Egret 2.4

Version
eui 1.0

Platform
Web

Language
zh_CN
Inherited from LayoutBase.setTypicalSize
- Defined in extension/eui/layouts/supportClasses/LayoutBase.ts:170

scrollPositionChanged

scrollPositionChanged(): void
verticalScrollPosition 或 horizontalScrollPosition 属性更改时调用。

Returns void

Version
Egret 2.4

Version
eui 1.0

Platform
Web

Language
zh_CN
Inherited from LayoutBase.scrollPositionChanged
- Defined in extension/eui/layouts/supportClasses/LayoutBase.ts:200

clearVirtualLayoutCache

clearVirtualLayoutCache(): void
如果 useVirtualLayout 为 true，则当布局目标改变时，布局目标可以使用此方法来清除已缓存布局信息。

Returns void

Version
Egret 2.4

Version
eui 1.0

Platform
Web

Language
zh_CN
Inherited from LayoutBase.clearVirtualLayoutCache
- Defined in extension/eui/layouts/supportClasses/LayoutBase.ts:222

elementAdded

elementAdded(index: number): void
在已添加布局元素之后且在验证目标的大小和显示列表之前，由目标调用。按元素状态缓存的布局（比如虚拟布局）可以覆盖此方法以更新其缓存。
Parameters
- index: number
  发生改变的子项索引
Returns void

Version
Egret 2.4

Version
eui 1.0

Platform
Web

Language
zh_CN
Inherited from LayoutBase.elementAdded
- Defined in extension/eui/layouts/supportClasses/LayoutBase.ts:250

elementRemoved

elementRemoved(index: number): void
必须在已删除布局元素之后且在验证目标的大小和显示列表之前，由目标调用此方法。按元素状态缓存的布局（比如虚拟布局）可以覆盖此方法以更新其缓存。
Parameters
- index: number
  发生改变的子项索引
Returns void

Version
Egret 2.4

Version
eui 1.0

Platform
Web

Language
zh_CN
Inherited from LayoutBase.elementRemoved
- Defined in extension/eui/layouts/supportClasses/LayoutBase.ts:279

getElementIndicesInView

getElementIndicesInView(): number[]
返回此 Group 中可见的元素的索引。

Returns number[]
可见的元素的索引。

Version
Egret 2.4

Version
eui 1.0

Platform
Web

Language
zh_CN
Inherited from LayoutBase.getElementIndicesInView
- Defined in extension/eui/layouts/supportClasses/LayoutBase.ts:302