harmony 鸿蒙Panel

2022-08-09
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Panel

The component is a slidable panel that presents lightweight content with flexible sizes.

NOTE

This component is supported since API version 7. Updates will be marked with a superscript to indicate their earliest API version.

Child Components

Supported

NOTE

Built-in components and custom components are allowed, with support for (if/else, ForEach, and LazyForEach) rendering control.

APIs

Panel(show: boolean)

Parameters

Name	Type	Mandatory	Description
show	boolean	Yes	Whether the panel is shown. NOTE The panel is hidden and does not take up space in the layout if this parameter is set to false or Visible.None is set.

Attributes

In addition to the universal attributes, the following attributes are supported.

Name	Type	Description
type	PanelType	Type of the panel. Default value: PanelType.Foldable
mode	PanelMode	Initial status of the panel. Default value for the Minibar type: PanelMode.Mini Default value for other types: PanelMode.Half Since API version 10, this attribute supports $$ for two-way binding of variables.
dragBar	boolean	Whether to enable a drag bar. The value true means that the drag bar will be displayed, and false means the opposite. Default value: true
customHeight¹⁰⁺	Dimension \|PanelHeight	Height of the panel in the PanelType.CUSTOM type. Default value: 0 NOTE This attribute cannot be set in percentage.
fullHeight	string \|number	Height of the panel in PanelMode.Full mode. Default value: main axis height of the panel minus 8 vp NOTE This attribute cannot be set in percentage.
halfHeight	string \|number	Height of the panel in PanelMode.Half mode. Default value: half of the main axis height of the panel NOTE This attribute cannot be set in percentage.
miniHeight	string \|number	Panel height in the PanelMode.Mini mode. Default value: 48 Unit: vp NOTE This attribute cannot be set in percentage.
show	boolean	Whether to show the panel. Default value: true
backgroundMask⁹⁺	ResourceColor	Background mask of the panel. Default value: ’#08182431’
showCloseIcon¹⁰⁺	boolean	Whether to display the close icon. The value true means to display the close icon, and false means the opposite. Default value: false

PanelType

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.
CUSTOM¹⁰⁺	A custom panel automatically adapts its height to the content, without support for manual size switching.

PanelMode

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.

PanelHeight¹⁰⁺

Name	Description
WRAP_CONTENT	When the type is CUSTOM, the panel automatically adapts its height to the content.

Events

In addition to the universal events, the following events are supported.

Name	Description
onChange(event: (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 panel height is the sum of the drag bar height and content area height.
onHeightChange(callback: (value: number) => void)⁹⁺	Triggered when the height of the panel changes. The returned height value is the height of the content area, in px by default. When the value of dragBar is true, the panel height is the sum of the drag bar height and content area height. For user experience purposes, the panel can be slid to only this height: fullHeight - 8 vp.

Example

// xxx.ets
@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 drag bar is enabled by default.
      .halfHeight(500) // The panel height is half of the screen height by default.
      .showCloseIcon(true) // Display the close icon.
      .onChange((width: number, height: number, mode: PanelMode) => {
        console.info(`width:${width},height:${height},mode:${mode}`)
      })
    }.width('100%').height('100%').backgroundColor(0xDCDCDC).padding({ top: 5 })
  }
}

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