noname-gesture

基于JavaScript开发的移动端手势库，支持单击，双击，长按，滑动，拖拽，双指旋转，双指缩放，鼠标滚轮缩放。兼容主流浏览器，上手简单，零依赖。

Demo: http://nonamegesture.codeman.top

Getting Started

In a browser:

<script src="path/noname-gesture.js"></script>

Example

<div id="box"></div>
const divDom = document.getElementById('box');
const gesture = new NonameGesture(divDom, {
    pointerdown: function (e) { },
    pointermove: function (e) { },
    pointerup: function (e) { },
    pointercancel: function (e) { },
    wheel: function (e) { },
    tap: function (e) { },
    singleTap: function (e) { },
    longTap: function (e) { },
    doubleTap: function (e) { },
    drag: function (e) { },
    swipe: function (e) { },
    rotate: function (e) { },
    pinch: function (e) { }
});

// 双指旋转
<img id="rotateImage" alt="">
const rotateImage = document.getElementById('rotateImage');
let result, x = 0, y = 0, rotate = 0;
// 图片加载成功后再绑定事件
rotateImage.addEventListener('load', function () {
    const rotateGesture = new NonameGesture(rotateImage, {
        rotate: function (e) {
            // transform-origin相对于视口左上角的坐标
            const origin = {
                x: result.width * 0.5 + x,
                y: result.height * 0.5 + y
            };
            // 计算点图片变换中心绕双指中心旋转e._rotate度后的坐标，设为点a
            const a = {
                x: (origin.x - e._centerX) * Math.cos(e._rotate * Math.PI / 180) - (origin.y - e._centerY) * Math.sin(e._rotate * Math.PI / 180) + e._centerX,
                y: (origin.x - e._centerX) * Math.sin(e._rotate * Math.PI / 180) + (origin.y - e._centerY) * Math.cos(e._rotate * Math.PI / 180) + e._centerY
            }
            // 计算偏移量
            x -= origin.x - a.x;
            y -= origin.y - a.y;
            // 旋转角度
            rotate = (rotate + e._rotate + 360) % 360;
            rotateImage.style.transform = 'translate3d(' + x + 'px, ' + y + 'px, 0px) rotate(' + rotate + 'deg)';
        }
    });
    result = rotateGesture.getImgSize(rotateImage.naturalWidth, rotateImage.naturalHeight, window.innerWidth, window.innerHeight);
    rotateImage.style.width = result.width + 'px';
    rotateImage.style.height = result.height + 'px';
    rotateImage.style.transform = 'translate3d(' + x + 'px, ' + y + 'px, 0px) rotate(' + rotate + 'deg)';
});
// 图片赋值需放在load回调之后，因为图片缓存后读取很快，有可能不执行load回调
rotateImage.src = 'xxx.jpg';

// 双指缩放
<img id="pinchImage" src="xxx.png" alt="">
const pinchImage = document.getElementById('pinchImage');
let result, x = 0, y = 0, scale = 1;
pinchImage.addEventListener('load', function () {
    const pinchGesture = new NonameGesture(pinchImage, {
        pinch: function (e) {
            scale *= e._scale;
            const origin = {
                x: (e._scale - 1) * result.width * 0.5,
                y: (e._scale - 1) * result.height * 0.5
            };
            // 以双指中心为缩放原点计算偏移量
            x -= (e._scale - 1) * (e._centerX - x) - origin.x - (e._centerX - e._lastCenterX);
            y -= (e._scale - 1) * (e._centerY - x) - origin.y - (e._centerY - e._lastCenterY);
            pinchImage.style.transform = 'translate3d(' + x + 'px, ' + y + 'px, 0px) scale(' + scale + ')';
        }
    });
    result = pinchGesture.getImgSize(pinchImage.naturalWidth, pinchImage.naturalHeight, window.innerWidth, window.innerHeight);
    pinchImage.style.width = result.width + 'px';
    pinchImage.style.height = result.height + 'px';
    pinchImage.style.transform = 'translate3d(' + x + 'px, ' + y + 'px, 0px) scale(' + scale + ')';
});
pinchImage.src = 'xxx.jpg';

Options

Params	Type	Defaults	Description
element	HTMLElement	null	绑定事件的元素，必填参数
options	object	null	配置项
options.pointerdown	function	null	pointerdown回调函数
options.pointermove	function	null	pointermove回调函数
options.pointerup	function	null	pointerup回调函数
options.pointercancel	function	null	pointercancel回调函数
options.wheel	function	null	鼠标滚轮回调函数
options.tap	function	null	单击回调函数
options.singleTap	function	null	点击回调函数，250ms延时
options.longTap	function	null	长按回调函数
options.doubleTap	function	null	双击回调函数，会触发两次tap
options.drag	function	null	拖拽回调函数
options.swipe	function	null	滑动回调函数
options.rotate	function	null	双指旋转回调函数
options.pinch	function	null	双指缩放回调函数