harmony(鸿蒙)FormExtension

2022-08-09
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FormExtension

The FormExtension module provides APIs related to Form Extension abilities.

NOTE

The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version. The APIs of this module can be used only in the stage model.

Modules to Import

import FormExtension from '@ohos.application.FormExtension';

Required Permissions

None

Attributes

System capability: SystemCapability.Ability.Form

Name	Type	Readable	Writable	Description
context	FormExtensionContext	Yes	No	Context of the FormExtension. This context is inherited from ExtensionContext.

onCreate

onCreate(want: Want): formBindingData.FormBindingData

Called to notify the widget provider that a Form instance (widget) has been created.

System capability: SystemCapability.Ability.Form

Parameters

Name	Type	Mandatory	Description
want	Want	Yes	Information related to the extension, including the widget ID, name, and style. The information must be managed as persistent data to facilitate subsequent widget update and deletion.

Return value

Type	Description
formBindingData.FormBindingData	A formBindingData.FormBindingData object containing the data to be displayed on the widget.

Example

  import formBindingData from '@ohos.application.formBindingData'
  export default class MyFormExtension extends FormExtension {
      onCreate(want) {
          console.log('FormExtension onCreate, want:' + want.abilityName);
          let dataObj1 = {
              temperature:"11c",
              "time":"11:00"
          };
          let obj1 = formBindingData.createFormBindingData(dataObj1);
          return obj1;
      }
  }

FormExtension.onCastToNormal

onCastToNormal(formId: string): void

Called to notify the widget provider that a temporary widget has been converted to a normal one.

System capability: SystemCapability.Ability.Form

Parameters

Name	Type	Mandatory	Description
formId	string	Yes	ID of the widget that requests to be converted to a normal one.

Example

  export default class MyFormExtension extends FormExtension {
      onCastToNormal(formId) {
          console.log('FormExtension onCastToNormal, formId:' + formId);
      }
  }

FormExtension.onUpdate

onUpdate(formId: string): void

Called to notify the widget provider that a widget has been updated. After obtaining the latest data, the caller invokes updateForm of the FormExtensionContext class to update the widget data.

System capability: SystemCapability.Ability.Form

Parameters

Name	Type	Mandatory	Description
formId	string	Yes	ID of the widget that requests to be updated.

Example

  import formBindingData from '@ohos.application.formBindingData'
  export default class MyFormExtension extends FormExtension {
      onUpdate(formId) {
          console.log('FormExtension onUpdate, formId:' + formId);
          let obj2 = formBindingData.createFormBindingData({temperature:"22c", time:"22:00"});
          this.context.updateForm(formId, obj2)
              .then((data)=>{
                  console.log('FormExtension context updateForm, data:' + data);
              }).catch((error) => {
              console.error('Operation updateForm failed. Cause: ' + error);});
      }
  }

FormExtension.onVisibilityChange

onVisibilityChange(newStatus: { [key: string]: number }): void

Called to notify the widget provider of the change of visibility.

System capability: SystemCapability.Ability.Form

Parameters

Name	Type	Mandatory	Description
newStatus	{ [key: string]: number }	Yes	ID and visibility status of the widget to be changed.

Example

    import formBindingData from '@ohos.application.formBindingData'
  export default class MyFormExtension extends FormExtension {
      onVisibilityChange(newStatus) {
          console.log('FormExtension onVisibilityChange, newStatus:' + newStatus);
          let obj2 = formBindingData.createFormBindingData({temperature:"22c", time:"22:00"});
  
          for (let key in newStatus) {
              console.log('FormExtension onVisibilityChange, key:' + key + ", value=" + newStatus[key]);
              this.context.updateForm(key, obj2)
                  .then((data)=>{
                      console.log('FormExtension context updateForm, data:' + data);
                  }).catch((error) => {
                  console.error('Operation updateForm failed. Cause: ' + error);});
          }
      }
  }

FormExtension.onEvent

onEvent(formId: string, message: string): void

Called to instruct the widget provider to receive and process the widget event.

System capability: SystemCapability.Ability.Form

Parameters

Name	Type	Mandatory	Description
formId	string	Yes	ID of the widget that requests the event.
message	string	Yes	Event message.

Example

  export default class MyFormExtension extends FormExtension {
      onEvent(formId, message) {
          console.log('FormExtension onEvent, formId:' + formId + ", message:" + message);
      }
  }

FormExtension.onDestroy

onDestroy(formId: string): void

Called to notify the widget provider that a Form instance (widget) has been destroyed.

System capability: SystemCapability.Ability.Form

Parameters

Name	Type	Mandatory	Description
formId	string	Yes	ID of the widget to be destroyed.

Example

  export default class MyFormExtension extends FormExtension {
      onDestroy(formId) {
          console.log('FormExtension onDestroy, formId:' + formId);
      }
  }

FormExtension.onConfigurationUpdated

onConfigurationUpdated(config: Configuration): void;

Called when the configuration of the environment where the ability is running is updated.

System capability: SystemCapability.Ability.Form

Parameters

Name	Type	Mandatory	Description
config	Configuration	Yes	New configuration.

Example

  class MyFormExtension extends FormExtension {
      onConfigurationUpdated(config) {
          console.log('onConfigurationUpdated, config:' + JSON.stringify(config));
      }
  }

FormExtension.onAcquireFormState

onAcquireFormState?(want: Want): formInfo.FormState;

Called when the widget provider receives the status query result of a widget. By default, the initial state is returned.

System capability: SystemCapability.Ability.Form

Parameters

Name	Type	Mandatory	Description
want	Want	No	Description of the widget state, including the bundle name, ability name, module name, widget name, and widget dimension.

Example

  import formInfo from '@ohos.application.formInfo'
  class MyFormExtension extends FormExtension {
      onAcquireFormState(want) {
          console.log('FormExtension onAcquireFormState, want:' + want);
          return formInfo.FormState.UNKNOWN;
      }
  }

FormExtension.onShare

onShare?(formId: string): {[key: string]: any};

Called by the widget provider to receive shared widget data.

This is a system API.

System capability: SystemCapability.Ability.Form

Parameters

Name	Type	Mandatory	Description
formId	string	Yes	ID of a widget.

Return value

Type	Description
{[key: string]: any}	Data to be shared by the widget, in the form of key-value pairs.

Example

  class MyFormExtension extends FormExtension {
      onShare(formId) {
          console.log('FormExtension onShare, formId:' + formId);
          let wantParams = {
            "temperature":"20",
            "time":"2022-8-8 09:59",
          };
          return wantParams;
      }
  }