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 16@Component 17@Entry 18struct ParentComponent { 19 @State countDownStartValue: number = 10; // 10 Nuggets default start value in a Game 20 build() { 21 Column() { 22 Text(`Grant ${this.countDownStartValue} nuggets to play.`) 23 Button() { 24 Text("+1 - Nuggets in New Game") 25 }.onClick(() => { 26 this.countDownStartValue += 1 27 }) 28 Button() { 29 Text("-1 - Nuggets in New Game") 30 }.onClick(() => { 31 this.countDownStartValue -= 1 32 }) 33 34 // when creatng ChildComponent, the initial value of its @Prop variable must be supplied in a named constructor parameter 35 // also regular costOfOneAttempt (non-Prop) variable is initialied 36 CountDownComponent({ count: this.countDownStartValue, costOfOneAttempt: 2 }) 37 } 38 } 39} 40 41@Component 42struct CountDownComponent { 43 44 @Prop count: number 45 costOfOneAttempt?: number 46 47 build() { 48 Column() { 49 if (this.count> 0) { 50 Text(`You have ${this.count} Nuggets left`) 51 } else { 52 Text("Game over!"); 53 } 54 55 Button() { 56 Text("Try again") 57 }.onClick(() => { 58 this.count -= this.costOfOneAttempt; 59 }) 60 } 61 } 62} 63