harmony 鸿蒙SaveButton

2023-10-30
浏览 (485)

SaveButton

The <SaveButton> security component allows you to obtain temporary storage permission from the user by their touching the button, eliminating the need for a permission request dialog box.

NOTE

This component is supported since API version 10. Updates will be marked with a superscript to indicate their earliest API version.

Child Components

Not supported

APIs

SaveButton

SaveButton()

Creates a Save button with an icon, text, and background.

SaveButton

SaveButton(option:{icon?: SaveIconStyle, text?: SaveDescription, buttonType?: ButtonType})

Creates a Save button that contains the specified elements.

Parameters

Name	Type	Mandatory	Description
icon	SaveIconStyle	No	Icon style of the Save button. If this parameter is not specified, no icon is contained. Either icon or text, or both, must be set.
text	SaveDescription	No	Text on the Save button. If this parameter is not specified, no text is contained. Either icon or text, or both, must be set.
buttonType	ButtonType	No	Background style of the Save button. If this parameter is not specified, there is no background.

SaveIconStyle

Name	Description
FULL_FILLED	Filled style icon.
LINES	Line style icon.

SaveDescription

Name	Description
DOWNLOAD	The text on the Save button is Download.
DOWNLOAD_FILE	The text on the Save button is Download File.
SAVE	The text on the Save button is Save.
SAVE_IMAGE	The text on the Save button is Save Image.
SAVE_FILE	The text on the Save button is Save File.
DOWNLOAD_AND_SHARE	The text on the Save button is Download and Share.
RECEIVE	The text on the Save button is Receive.
CONTINUE_TO_RECEIVE	The text on the Save button is Continue.

SaveButtonOnClickResult

Name	Description
SUCCESS	The Save button is touched successfully.
TEMPORARY_AUTHORIZATION_FAILED	Temporary authorization fails after the Save button is touched.

Attributes

This component can only inherit the universal attributes of security components

Events

Only the following events are supported.

Name	Description
onClick(event: (event: ClickEvent), result: SaveButtonOnClickResult) => void)	Triggered when the component is touched. result: authorization result. The authorization is effective for 10 seconds. This means that, a specific media library API can be called, an unlimited number of times, within 10 seconds of the touch. If the API is not called within the 10 seconds, the authorization fails. event: For details, see ClickEvent.

Example

// xxx.ets
import photoAccessHelper from '@ohos.file.photoAccessHelper';
import fs from '@ohos.file.fs';

@Entry
@Component
struct Index {
  build() {
    Row() {
      Column({space:10}) {
        // Create a default Save button with an icon, text, and background.
        SaveButton().onClick(async (event:ClickEvent, result:SaveButtonOnClickResult) => {
          if (result == SaveButtonOnClickResult.SUCCESS) {
            try {
              const context = getContext(this);
              let helper = photoAccessHelper.getPhotoAccessHelper(context);
              // After onClick is triggered, the createAsset API can be called within 5 seconds to create an image file. After 5 seconds have elapsed, the permission to call createAsset is revoked.
              let uri = await helper.createAsset(photoAccessHelper.PhotoType.IMAGE, 'png');
              // Use the URI to open the file. The write process is not time bound.
              let file = await fs.open(uri, fs.OpenMode.READ_WRITE|fs.OpenMode.CREATE);
              // Write to the file.
              await fs.write(file.fd, "context");
              // Close the file.
              await fs.close(file.fd);
            } catch (error) {
              console.error("error is "+ JSON.stringify(error));
            }
          }
        })
        // Whether an element is contained depends on whether the parameter corresponding to the element is specified.
        SaveButton({icon:SaveIconStyle.FULL_FILLED})
        // Create a Save button with only an icon and background.
        SaveButton({icon:SaveIconStyle.FULL_FILLED, buttonType:ButtonType.Capsule})
        // Create a Save button with an icon, text, and background.
        SaveButton({icon:SaveIconStyle.FULL_FILLED, text:SaveDescription.DOWNLOAD, buttonType:ButtonType.Capsule})
      }.width('100%')
    }.height('100%')
  }
}

en-us_image_0000001643320073