Size

The size attributes are used to set the width, height, padding, and margin of a component.

NOTE

The APIs of this module are supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.

Attributes

Name Type Description
width Length Width of the component. By default, the width required to fully hold the component content is used.
height Length Height of the component. By default, the height required to fully hold the component content is used.
size {
width?: Length,
height?: Length
}		 Size of the component.
padding Padding | Length Padding of the component.
When the parameter is of the Length type, the four paddings take effect.
Default value: 0
margin Margin) | Length Margin of the component.
When the parameter is of the Length type, the four margins take effect.
Default value: 0
constraintSize {
minWidth?: Length,
maxWidth?: Length,
minHeight?: Length,
maxHeight?: Length
}		 Constraint size of the component, which is used to limit the size range during component layout. constraintSize takes precedence over width and height.
Default value:
{
minWidth: 0,
maxWidth: Infinity,
minHeight: 0,
maxHeight: Infinity
}
layoutWeight number | string Weight of the component during layout. When the container size is determined, the layout of the component and sibling components is allocated based on the weight along the main axis. The component size setting is ignored.
Default value: 0
NOTE
This attribute is valid only for the <Row>, <Column>, and <Flex> layouts.

Example

// xxx.ets
@Entry
@Component
struct SizeExample {
  build() {
    Column({ space: 10 }) {
      Text('margin and padding:').fontSize(12).fontColor(0xCCCCCC).width('90%')
      // The width is 80, the height is 80, the padding is 20, and the margin is 20.
      Row() {
        Row() {
          Row().size({ width: '100%', height: '100%' }).backgroundColor(0xAFEEEE)
        }.width(80).height(80).padding(20).margin(20).backgroundColor(0xFDF5E6)
      }.backgroundColor(0xFFA500)

      Text('layoutWeight').fontSize(12).fontColor(0xCCCCCC).width('90%')
      // When the container size is determined, the layout of the component and sibling components is allocated based on the weight along the main axis. The component size setting is ignored.
      Row() {
        // Weight 1
        Text('layoutWeight(1)')
          .size({ width: '30%', height: 110 }).backgroundColor(0xFFEFD5).textAlign(TextAlign.Center)
          .layoutWeight(1)
        // Weight 0
        Text('layoutWeight(2)')
          .size({ width: '30%', height: 110 }).backgroundColor(0xF5DEB3).textAlign(TextAlign.Center)
          .layoutWeight(2)
        // The default weight is 0.
        Text('no layoutWeight')
          .size({ width: '30%', height: 110 }).backgroundColor(0xD2B48C).textAlign(TextAlign.Center)
      }.size({ width: '90%', height: 140 }).backgroundColor(0xAFEEEE)
    }.width('100%').margin({ top: 5 })
  }}

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