//*********************
// create by 流云
// time: 2021.01.05
// desc: 打印字符组件
//*********************

import { Component, Label, RichText, _decorator, Node } from "cc";
import { DEV } from "cc/env";

const { ccclass, property } = _decorator;

/**
 * 打印字符组件
 */
@ccclass
export default class PrintChar extends Component {


    @property({ tooltip: DEV && '打印速度' })
    private speed: number = 1;

    @property({ tooltip: DEV && '自动播放' })
    private playOnLoad: boolean = false;

    private _lb: Label | RichText ;
    private _text: string = `少得了开关就傻掉了看风景撒了国家是，奥斯卡了刚加上了，打飞机按时，第三方`;
    private _strArr = [];
    private _curent_index = 0;


    onLoad() {
        this._lb = this.node.getComponent(Label);
        if (!this._lb)
            this._lb = this.node.getComponent(RichText);
        if (this._lb)
            this._text = this._lb.string;
        else {
            this._lb = this.node.addComponent(Label);
        }
        this._lb.string = ``;
    }

    onEnable() {
        if (this.playOnLoad && this._text != ``)
            this.startPrint();
    }

    onDisable() {
        this.unscheduleAllCallbacks();
        this._lb.string = "";
    }

    public print(str: string, speed = 1) {
        this.speed = speed;
        this._text = str;
        if (this._lb)
            this.startPrint();
    }

    public clear() {
        this._text = ``;
        this._lb.string = ``;
    }

    private startPrint() {
        this._strArr = [];
        this._curent_index = 0;
        this._lb.string = "";
        this.unscheduleAllCallbacks();
        for (let i = 0; i < this._text.length; i++) {
            this._strArr.push(this._text.substring(0, i + 1));
        }
        this.schedule(() => {
            this.next();
        }, this.speed);
    }

    private next() {
        if (this._curent_index < this._text.length) {
            this.showContent(this._strArr[this._curent_index]);
        }
        else {
            this.unscheduleAllCallbacks();
        }
        this._curent_index++;
    }

    private showContent(str) {
        if (this._lb)
            this._lb.string = str;
    }
}