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@any-touch/doubletap

v2.2.0

Published

any-touch的识别器, 用来识别双击手势, 是Tap识别器的一个特例

Downloads

1,126

Readme

@any-touch/doubletap

双击识别器. 基于@any-touch/tap实现, 是tap的一个特例.

安装

npm i -S @any-touch/doubletap

快速开始

// 只加载tap识别器(拖拽)
import Core from '@any-touch/core';
import doubletap from '@any-touch/doubletap';
const at = new Core(el);
at.use(doubletap)

// 双击
at.on('doubletap', (event) => {
    console.log(event) // 包含点击位置信息
});

源码解析

因为是基于@any-touch/tap实现的, 所以代码不多, 只是使用beforeEach拦截器.

export default function (at: Core) {
    at.use(tap, { name: 'doubletap', tapTimes: 2 });
    const doubleTapContext = at.get('doubletap')
    let timeID: number;
    at.beforeEach((type, next) => {
        if ('tap' === type) {
            clearTimeout(timeID);
            timeID = setTimeout(() => {
                if ([STATE.POSSIBLE, STATE.FAILED].includes(doubleTapContext.state)) {
                    next();
                }
            }, 300);
        } else {
            next();
        }
    });
    return doubleTapContext;
}

这里只需要多理解一个概念就是STATE(识别器的状态). |名称|解释| |---|---| |POSSIBLE|待识别| |RECOGNIZED|已识别| |FAILED|识别失败|

识别流程如下, 每次点击屏幕, STATE是"POSSIBLE状态, 识别成功后状态变成"RECOGNIZED", 识别失败变成"FAILED".

特别解释下"FAILED"的发生情况,用doubletap识别器举例, 当2次点击间隔时间过长, doubletap的状态就会变成"FAILED", 当第三次点击的时候状态又变回"POSSIBLE".

完整源码

N击

如果看懂了双击的逻辑, 那么稍作修改就可以实现"3击".

export default function (at: Core) {
    // ⭐只有这一行的tapTimes改成了3
    at.use(tap, { name: 'doubletap', tapTimes: 3 });

    // 未改动
    const doubleTapContext = at.get('doubletap')
    let timeID: number;
    at.beforeEach((type, next) => {
        if ('tap' === type) {
            clearTimeout(timeID);
            timeID = setTimeout(() => {
                if ([STATE.POSSIBLE, STATE.FAILED].includes(doubleTapContext.state)) {
                    next();
                }
            }, 300);
        } else {
            next();
        }
    });
    return doubleTapContext;
}