# Panel


> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE：**
> This component is supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.


The **<Panel>** component is a slidable panel that presents lightweight content with flexible sizes. It is a pop-up component.


## Required Permissions

None


## Child Components

This component can contain child components.


## APIs

Panel(value:{show:boolean})

- Parameter
    | Name | Type | Mandatory | Default Value | Description | 
  | -------- | -------- | -------- | -------- | -------- |
  | show | boolean | Yes | - | Whether the panel is shown or hidden. | 


## Attributes

  | Name | Type | Default Value | Description | 
| -------- | -------- | -------- | -------- |
| type | PanelType | PanelType.Foldable | Type of the panel. | 
| mode | PanelMode | - | Initial status of the panel. | 
| dragBar | boolean | true | Whether to enable a drag bar. The value **true** means that the drag bar will be displayed, and **false** means the opposite. | 
| fullHeight | Length | - | Panel height in the **PanelMode.Full** mode. | 
| halfHeight | Length | - | Panel height in the **PanelMode.Half** mode. The default value is half of the screen height. | 
| miniHeight | Length | - | Panel height in the **PanelMode.Mini** mode. | 

- PanelType enums
    | Name | Description | 
  | -------- | -------- |
  | Minibar | A minibar panel displays content in the minibar area or a large (fullscreen-like) area. | 
  | Foldable | A foldable panel displays permanent content in a large (fullscreen-like), medium-sized (halfscreen-like), or small area. | 
  | Temporary | A temporary panel displays content in a large (fullscreen-like) or medium-sized (halfscreen-like) area. | 

- PanelMode enums
    | Name | Description | 
  | -------- | -------- |
  | Mini | Displays a **minibar** or **foldable** panel in its minimum size. This attribute does not take effect for **temporary** panels. | 
  | Half | Displays a **foldable** or **temporary** panel in a medium-sized (halfscreen-like) area. This attribute does not take effect for **minibar** panels. | 
  | Full | Displays a panel in a large (fullscreen-like) area. | 


## Events

  | Name | Description | 
| -------- | -------- |
| onChange(callback: (width: number, height: number, mode: PanelMode) => void) | Triggered when the status of the panel changes. The returned height value is the height of the content area. When the value of **dragbar** is **true**, the height of the panel is the dragbar height plus the height of the content area. | 


## Example


```
@Entry
@Component
struct PanelExample {
  @State show: boolean = false

  build() {
    Column() {
      Text('2021-09-30    Today Calendar: 1.afternoon......Click for details')
        .width('90%').height(50).borderRadius(10)
        .backgroundColor(0xFFFFFF).padding({ left: 20 })
        .onClick(() => {
          this.show = !this.show
        })
      Panel(this.show) { // Display the agenda.
        Column() {
          Text('Today Calendar')
          Divider()
          Text('1. afternoon 4:00 The project meeting')
        }
      }
      .type(PanelType.Foldable).mode(PanelMode.Half)
      .dragBar(true) // The dragbar is enabled by default.
      .halfHeight(500) // Half of the height by default
      .onChange((value: any) => {
        console.info(`width:${value.width},height:${value.height},mode:${value.mode}`)
      })
    }.width('100%').height('100%').backgroundColor(0xDCDCDC).padding({ top: 5 })
  }
}
```

![en-us_image_0000001256978381](figures/en-us_image_0000001256978381.gif)