1/* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16type PropertyInfo = string; 17 18/* 19 an instance that gets and sets the value of an IProperty 20 these are OneWaySyncedProperty, SyncedPropertyTwoWay 21 and (to be designed) View 22*/ 23interface IPropertySubscriber { 24 25 // globally unique id 26 id__(): number; 27 28 // inform the subscribed property 29 // that the subscriber is about to be deleted 30 // hence , unsubscribe 31 aboutToBeDeleted(owningView?: IPropertySubscriber): void; 32} 33 34interface ISinglePropertyChangeSubscriber<T> extends IPropertySubscriber { 35 // get informed after the property has changed. 36 hasChanged(newValue: T): void; 37} 38 39interface IMultiPropertiesChangeSubscriber extends IPropertySubscriber { 40 // get informed that given property has changed. 41 // Note: a Property's PropertyInfo can be undefined. 42 propertyHasChanged(info?: PropertyInfo): void; 43} 44 45interface IMultiPropertiesReadSubscriber extends IPropertySubscriber { 46 // get informed that given property has been read (get access). 47 // Note: a Property's PropertyInfo can be undefined. 48 propertyRead(info?: PropertyInfo): void; 49} 50