harmony 鸿蒙Text Picker Dialog Box

2022-08-09
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Text Picker Dialog Box

A text picker dialog box is a dialog box that allows users to select text from the given range.

NOTE

The APIs of this module are supported since API version 8. Updates will be marked with a superscript to indicate their earliest API version.

The functionality of this module depends on UI context. This means that the APIs of this module cannot be used where the UI context is unclear. For details, see UIContext.

Since API version 10, you can use the showTextPickerDialog API in UIContext to obtain the UI context.

TextPickerDialog.show

show(options?: TextPickerDialogOptions)

Shows a text picker in the given settings.

TextPickerDialogOptions

Name	Type	Mandatory	Description
range	string[] \|Resource\|TextPickerRangeContent[]¹⁰⁺	Yes	Data selection range of the picker. This parameter cannot be set to an empty array. If set to an empty array, it will not be displayed. NOTE The Resource type supports only strarray.json.
selected	number	No	Index of the selected item. Default value: 0
value	string	No	Text of the selected item. This parameter does not take effect when the selected parameter is set. If the value is not within the range, the first item in the range is used instead. NOTE This parameter works only when the picker contains text only.
defaultPickerItemHeight	number \|string	No	Height of the picker item.
disappearTextStyle¹⁰⁺	PickerTextStyle	No	Font color, font size, and font width for the top and bottom items. Default value: { color: ‘#ff182431’, font: { size: ‘14fp’, weight: FontWeight.Regular } }
textStyle¹⁰⁺	PickerTextStyle	No	Font color, font size, and font width of all items except the top, bottom, and selected items. Default value: { color: ‘#ff182431’, font: { size: ‘16fp’, weight: FontWeight.Regular } }
selectedTextStyle¹⁰⁺	PickerTextStyle	No	Font color, font size, and font width of the selected item. Default value: { color: ‘#ff007dff’, font: { size: ‘20vp’, weight: FontWeight.Medium } }
canLoop¹⁰⁺	boolean	No	Whether to support scroll looping. The value true means to support scroll looping, and false means the opposite. Default value: true
alignment¹⁰⁺	DialogAlignment	No	Alignment mode of the dialog box in the vertical direction. Default value: DialogAlignment.Default
offset¹⁰⁺	Offset	No	Offset of the dialog box based on the alignment settings. Default value: { dx: 0 , dy: 0 }
maskRect¹⁰⁺	Rectangle	No	Mask area of the dialog box. Events outside the mask area are transparently transmitted, and events within the mask area are not. Default value: { x: 0, y: 0, width: ‘100%’, height: ‘100%’ }
onAccept	(value: TextPickerResult) => void	No	Callback invoked when the OK button in the dialog box is clicked.
onCancel	() => void	No	Callback invoked when the Cancel button in the dialog box is clicked.
onChange	(value: TextPickerResult) => void	No	Callback invoked when the selected item changes.

TextPickerResult

Name	Type	Description
value	string \|string []¹⁰⁺	Text of the selected item. NOTE When the picker contains text only or both text and imagery, value indicates the text value of the selected item. (For a multi-column picker, value is of the array type.) For an image list, value is empty.
index	number \|number []¹⁰⁺	Index of the selected item in the range. (For a multi-column picker, index is of the array type.)

Example

// xxx.ets
@Entry
@Component
struct TextPickerDialogExample {
  private select: number|number[] = 2
  private fruits: string[] = ['apple1', 'orange2', 'peach3', 'grape4', 'banana5']

  build() {
    Row() {
      Column() {
        Button("TextPickerDialog")
          .margin(20)
          .onClick(() => {
            TextPickerDialog.show({
              range: this.fruits,
              selected: this.select,
              disappearTextStyle: {color: Color.Red, font: {size: 15, weight: FontWeight.Lighter}},
              textStyle: {color: Color.Black, font: {size: 20, weight: FontWeight.Normal}},
              selectedTextStyle: {color: Color.Blue, font: {size: 30, weight: FontWeight.Bolder}},
              onAccept: (value: TextPickerResult) => {
                // Set select to the index of the item selected when the OK button is touched. In this way, when the text picker dialog box is displayed again, the selected item is the one last confirmed.
                this.select = value.index
                console.info("TextPickerDialog:onAccept()" + JSON.stringify(value))
              },
              onCancel: () => {
                console.info("TextPickerDialog:onCancel()")
              },
              onChange: (value: TextPickerResult) => {
                console.info("TextPickerDialog:onChange()" + JSON.stringify(value))
              }
            })
          })
      }.width('100%')
    }.height('100%')
  }
}

TextPickerDialog