developtools_ace-ets2bundle/compiler/sample/pages/testcases/propSimpleModel.ets

/*
 * Copyright (c) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

@Component
@Entry
struct ParentComponent {
    @State countDownStartValue: number = 10; // 10 Nuggets default start value in a Game
    build() {
        Column() {
            Text(`Grant ${this.countDownStartValue} nuggets to play.`)
            Button() {
                Text("+1 - Nuggets in New Game")
            }.onClick(() => {
                this.countDownStartValue += 1
            })
            Button() {
                Text("-1  - Nuggets in New Game")
            }.onClick(() => {
                this.countDownStartValue -= 1
            })

            // when creatng ChildComponent, the initial value of its @Prop variable must be supplied in a named constructor parameter
            // also regular costOfOneAttempt (non-Prop) variable is initialied
            CountDownComponent({ count: this.countDownStartValue, costOfOneAttempt: 2 })
        }
    }
}

@Component
struct CountDownComponent {

    @Prop count: number
    costOfOneAttempt?: number

    build() {
        Column() {
            if (this.count> 0) {
                Text(`You have ${this.count} Nuggets left`)
            } else {
                Text("Game over!");
            }

            Button() {
                Text("Try again")
            }.onClick(() => {
                this.count -= this.costOfOneAttempt;
            })
        }
    }
}