# GridRow

The responsive grid layout provides rules for layout design and resolves issues of dynamic layout across devices with different sizes, thereby ensuring layout consistency across layouts on different devices.

The **\<GridRow>** component is used in a grid layout, together with its child component [\<GridCol>](ts-container-gridcol.md).

>  **NOTE**
>
> This component is supported since API version 9. Updates will be marked with a superscript to indicate their earliest API version.


## Child Components

This component can contain the **\<GridCol>** child component.


## APIs
GridRow(option?: {columns?: number | GridRowColumnOption, gutter?: Length | GutterOption, breakpoints?: BreakPoints, direction?: GridRowDirection})

Since API version 9, this API is supported in ArkTS widgets.

**Parameters**

| Name|Type|Mandatory|Description|
|-----|-----|----|----|
|columns| number \| [GridRowColumnOption](#gridrowcolumnoption) |  No |Number of columns in the grid layout.|
|gutter|[Length](ts-types.md#length) \| [GutterOption](#gutteroption)|   No |Gutter of the grid layout.|
|breakpoints|[BreakPoints](#breakpoints)|  No |Array of breakpoints for the breakpoint value and the corresponding reference based on the window or container size.|
|direction|[GridRowDirection](#gridrowdirection)|   No |Arrangement direction of the grid layout.|

## GutterOption

Provides the gutter options for the grid layout to define the spacing between child components in different directions.

Since API version 9, this API is supported in ArkTS widgets.

| Name  | Type  | Mandatory  | Description                                    |
| ----- | ------ | ---- | ---------------------------------------- |
| x  | [Length](ts-types.md#length) \| [GridRowSizeOption](#gridrowsizeoption) | No  | Horizontal spacing between grid child components.   |
| y  | [Length](ts-types.md#length) \| [GridRowSizeOption](#gridrowsizeoption) | No  | Vertical spacing between grid child components.   |

## GridRowColumnOption

Describes the numbers of grid columns for devices with different grid sizes.

Since API version 9, this API is supported in ArkTS widgets.

| Name  | Type  | Mandatory  | Description                                    |
| ----- | ------ | ---- | ---------------------------------------- |
| xs  | number | No   | Number of grid columns on the device where the grid size is xs.   |
| sm  | number | No   | Number of grid columns on the device where the grid size is sm.     |
| md  | number | No   | Number of grid columns on the device where the grid size is md.   |
| lg  | number | No   | Number of grid columns on the device where the grid size is lg.     |
| xl  | number | No   | Number of grid columns on the device where the grid size is xl.   |
| xxl | number | No   | Number of grid columns on the device where the grid size is xxl.   |

**NOTE**

In the **\<GridRow>** component, you can define the value range of [breakpoints](../../ui/arkts-layout-development-grid-layout.md#grid-breakpoints). A maximum of six breakpoints are supported, which are xs, sm, md, lg, xl, and xxl. The breakpoint names cannot be modified. Assume that the input array is [n0, n1, n2, n3, n4], then the value ranges of breakpoints are as follows. 
|Breakpoint|Value Range|
|---|-----------|
|xs |[0, n0)    |
|sm |[n0, n1)   |
|md |[n1, n2)   |
|lg |[n2, n3)   |
|xl |[n3, n4)   |
|xxl|[n4, INF)  |

## GridRowSizeOption

Describes the gutter sizes for different device width types.

Since API version 9, this API is supported in ArkTS widgets.

| Name  | Type  | Mandatory  | Description                                    |
| ----- | ------ | ---- | ---------------------------------------- |
| xs  | [Length](ts-types.md#length) | No   | Gutter size for minimum device width.   |
| sm  | [Length](ts-types.md#length) | No   | Gutter size for small device width.     |
| md  | [Length](ts-types.md#length) | No   | Gutter size for medium device width.   |
| lg  | [Length](ts-types.md#length) | No   | Gutter size for large device width.     |
| xl  | [Length](ts-types.md#length) | No   | Gutter size for extra large device width.   |
| xxl | [Length](ts-types.md#length) | No   | Gutter size for extra extra large device width.   |

## BreakPoints

Sets breakpoints for the responsive grid container.

Since API version 9, this API is supported in ArkTS widgets.

| Name  | Type  | Mandatory  | Description                                    |
| ----- | ------ | ---- | ---------------------------------------- |
| value  | Array&lt;string&gt; | No | Array of monotonically increasing breakpoints.<br>Default value: **["320vp", "600vp", "840vp"]**   |
| reference  | [BreakpointsReference](#breakpointsreference) | No   | Breakpoint switching reference.<br>Default value: **BreakpointsReference.WindowSize**|
```ts
  // Enable the xs, sm, and md breakpoints.
  breakpoints: {value: ["100vp", "200vp"]}
  // Enable four breakpoints: xs, sm, md, and lg. The breakpoint range must be monotonically increasing.
  breakpoints: {value: ["320vp", "600vp", "840vp"]}
  // Enable five breakpoints: xs, sm, md, lg, and xl. The number of breakpoint ranges cannot exceed the number of breakpoints minus 1.
  breakpoints: {value: ["320vp", "600vp", "840vp", "1080vp"]}
```

## BreakpointsReference

Since API version 9, this API is supported in ArkTS widgets.

| Name| Description|
| -------- | -------- |
| WindowSize | The window is used as a reference.|
| ComponentSize | The container is used as a reference.|

## GridRowDirection

Since API version 9, this API is supported in ArkTS widgets.

| Name| Description|
| -------- | -------- |
| Row | Grid elements are arranged in the row direction.|
| RowReverse | Grid elements are arranged in the reverse row direction.|

**NOTE**
* Grid elements can be arranged only in the **Row** or **RowReverse** direction, but not in the **Column** or **ColumnReverse** direction.
* The location and size of a grid child component can be calculated only based on **span** and **offset**. If the **span** values of child components add up to a number greater than the allowed number of columns, the grid will automatically wraps lines.
* If the **span** value of a single child component exceeds the maximum number of columns, the maximum number of columns is used.
* If a child component takes up more than the total number of columns according to its **offset** and **span** settings, it will be placed in a new row.
* Below is the display effect of **Item1: GridCol({span: 6}), Item2: GridCol({ span: 8, offset:11})**. 

|1      | 2     | 3     | 4     | 5     | 6     | 7     | 8     | 9     | 10    | 11    | 12    |
| ----- | ------ | ---- | ---- | -----|-----|---------|--------|------|------- |------- |------- |
| $\circ$ | $\circ$ | $\circ$ | $\circ$ | $\circ$|$\circ$| - |  - |  - |  -  | -  | -  |
| -     | -     | -     | -     | -     |       |       |       |       |       |   |   |
| $\circ$ | $\circ$ | $\circ$ | $\circ$ | $\circ$|$\circ$|$\circ$|$\circ$|  |   |   |   |

## Attributes

In addition to the [universal attributes](ts-universal-attributes-size.md), the following attributes are supported.

| Name                      | Type                           | Description                                              |
| ----------------------- | ----------------------------------- | ------------------------------------------- |
| alignItems<sup>10+</sup>             | ItemAlign | Alignment mode of the **\<GridCol>** cross axis.<br>Default value: **ItemAlign.Start**<br>**NOTE**<br>**ItemAlign** supports the following enums: **ItemAlign.Start**, **ItemAlign.Center**, **ItemAlign.End**, and **ItemAlign.Stretch**.<br>The alignment mode of the **\<GridCol>** component can also be set using **alignSelf([ItemAlign](ts-appendix-enums.md#itemalign))**. If both of the preceding methods are used, the setting of **alignSelf(ItemAlign)** prevails.<br>Since API version 10, this API is supported in ArkTS widgets.|


## Events

### onBreakpointChange

onBreakpointChange(callback: (breakpoints: string) => void)

Triggered when the breakpoint changes.

Since API version 9, this API is supported in ArkTS widgets.

**Parameters**

| Name  | Type  | Mandatory  | Description  |
| ----- | ------ | ---- | ---------------------------------------- |
|breakpoints| string |No|Breakpoint change.<br> The value can be **"xs"**, **"sm"**, **"md"**, **"lg"**, **"xl"**, or **"xxl"**.|

## Example

```ts
// xxx.ets
@Entry
@Component
struct GridRowExample {
  @State bgColors: Color[] = [Color.Red, Color.Orange, Color.Yellow, Color.Green, Color.Pink, Color.Grey, Color.Blue, Color.Brown]
  @State currentBp: string = 'unknown'

  build() {
    Column() {
      GridRow({
        columns: 5,
        gutter: { x: 5, y: 10 },
        breakpoints: { value: ["400vp", "600vp", "800vp"],
          reference: BreakpointsReference.WindowSize },
        direction: GridRowDirection.Row
      }) {
        ForEach(this.bgColors, (color: Color) => {
          GridCol({ span: { xs: 1, sm: 2, md: 3, lg: 4 }, offset: 0, order: 0 }) {
            Row().width("100%").height("20vp")
          }.borderColor(color).borderWidth(2)
        })
      }.width("100%").height("100%")
      .onBreakpointChange((breakpoint) => {
        this.currentBp = breakpoint
      })
    }.width('80%').margin({ left: 10, top: 5, bottom: 5 }).height(200)
    .border({ color: '#880606', width: 2 })
  }
}
```

![figures/gridrow.png](figures/gridrow.png)