game_cocos_2c/assets/scripts/components/selectBox/SelectBox.ts

import { addBtnClick } from '@scripts/utils/UIHelper';
import { _decorator, Button, Component, EditBox, Label, Node, instantiate } from 'cc';
const { ccclass, property } = _decorator;

@ccclass('SelectBox')
export class SelectBox extends Component {
    @property(Label)
    label: Label;

    @property(Node)
    pull_toggle: Node;

    @property(Node)
    pull_up: Node;

    @property(Node)
    pull_down: Node;

    @property(Node)
    layout: Node;

    @property(Node)
    item: Node;

    private _current_idx: number = -1;

    protected onLoad(): void {
        addBtnClick(this.pull_toggle, this.onBtnToggleClick, this);

    }

    protected onEnable(): void {

    }

    protected onDisable(): void {

    }

    private init() {
        this.pull_down.active = true;
        this.pull_up.active = false;
        this.layout.active = false;
        this.layout.removeAllChildren();
        this.label.string = '';
    }

    public initSelectItems(data: string[] = []) {
        const selectData = data;
        this.init();

        for (let i = 0; i < selectData.length; i++) {
            const item = instantiate(this.item);
            item.active = true;
            item.parent = this.layout;
            item.getChildByName("selected").active = false;
            item.getChildByName("label").getComponent(Label).string = selectData[i];

            addBtnClick(item, () => { this.handleClickItem(i, selectData[i]) }, this);
        }
    }

    public getSelectedStr() {
        return this.label.string;
    }

    private handleClickItem(i: number, data: string) {
        this.label.string = data;
        this._current_idx = i;
        this.onBtnToggleClick();
    }

    private onBtnToggleClick() {
        this.pull_down.active = !this.pull_down.active;
        this.pull_up.active = !this.pull_up.active;
        this.layout.active = !this.layout.active;

        if (this.layout.active) {
            // 标记selected
            this.layout.children.forEach((item, index) => {
                if (index === this._current_idx) {
                    item.getChildByName("selected").active = true;
                } else {
                    item.getChildByName("selected").active = false;
                }
            })
        }
    }
}