小程序基础开发（四）：template模板应用(2)——带裁剪功能的头像上传，封装wx.uploadFile组件
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2022-03-24 22:20:41
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一，头像上传
wxml
<view class="bg-white flex justify-between align-center padding-sm">
<view class="text-black">头像</view>
<image style="width:200rpx;height:200rpx;" src='{{comp_img}}' bindtap='change_img'></image>
</view>
js
change_img: function () {
wx.chooseImage({
count: 1, // 默认9
sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有
sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
success(res) {
const src = res.tempFilePaths[0]
wx.navigateTo({
url: '../../../../../../canvas/upload/upload?src=' + src//裁剪专用页面
})
}
})
},
template.wxml
<!--模块2-图片剪切--->
<template name="weCropper">
<canvas
class="cropper"
disable-scroll="true"
bindtouchstart="touchStart"
bindtouchmove="touchMove"
bindtouchend="touchEnd"
style="width:{{width}}px;height:{{height}}px;background-color: rgba(0, 0, 0, 0.8)"
canvas-id="{{id}}">
</canvas>
</template>
template.js
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
(global.weCropper = factory());
}(this, (function () {
'use strict';
/**
* Created by sail on 2017/6/11.
*/
var device = void 0;
var TOUCH_STATE = ['touchstarted', 'touchmoved', 'touchended'];
function firstLetterUpper(str) {
return str.charAt(0).toUpperCase() + str.slice(1);
}
function setTouchState(instance) {
for (var _len = arguments.length, arg = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
arg[_key - 1] = arguments[_key];
}
TOUCH_STATE.forEach(function (key, i) {
if (arg[i] !== undefined) {
instance[key] = arg[i];
}
});
}
function validator(instance, o) {
Object.defineProperties(instance, o);
}
function getDevice() {
if (!device) {
device = wx.getSystemInfoSync();
}
return device;
}
var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
return typeof obj;
} : function (obj) {
return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
};
var classCallCheck = function (instance, Constructor) {
if (!(instance instanceof Constructor)) {
throw new TypeError("Cannot call a class as a function");
}
};
var createClass = function () {
function defineProperties(target, props) {
for (var i = 0; i < props.length; i++) {
var descriptor = props[i];
descriptor.enumerable = descriptor.enumerable || false;
descriptor.configurable = true;
if ("value" in descriptor) descriptor.writable = true;
Object.defineProperty(target, descriptor.key, descriptor);
}
}
return function (Constructor, protoProps, staticProps) {
if (protoProps) defineProperties(Constructor.prototype, protoProps);
if (staticProps) defineProperties(Constructor, staticProps);
return Constructor;
};
}();
var slicedToArray = function () {
function sliceIterator(arr, i) {
var _arr = [];
var _n = true;
var _d = false;
var _e = undefined;
try {
for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
_arr.push(_s.value);
if (i && _arr.length === i) break;
}
} catch (err) {
_d = true;
_e = err;
} finally {
try {
if (!_n && _i["return"]) _i["return"]();
} finally {
if (_d) throw _e;
}
}
return _arr;
}
return function (arr, i) {
if (Array.isArray(arr)) {
return arr;
} else if (Symbol.iterator in Object(arr)) {
return sliceIterator(arr, i);
} else {
throw new TypeError("Invalid attempt to destructure non-iterable instance");
}
};
}();
var tmp = {};
var DEFAULT = {
id: {
default: 'cropper',
get: function get$$1() {
return tmp.id;
},
set: function set$$1(value) {
if (typeof value !== 'string') {
console.error('id\uFF1A' + value + ' is invalid');
}
tmp.id = value;
}
},
width: {
default: 750,
get: function get$$1() {
return tmp.width;
},
set: function set$$1(value) {
if (typeof value !== 'number') {
console.error('width\uFF1A' + value + ' is invalid');
}
tmp.width = value;
}
},
height: {
default: 750,
get: function get$$1() {
return tmp.height;
},
set: function set$$1(value) {
if (typeof value !== 'number') {
console.error('height\uFF1A' + value + ' is invalid');
}
tmp.height = value;
}
},
scale: {
default: 2.5,
get: function get$$1() {
return tmp.scale;
},
set: function set$$1(value) {
if (typeof value !== 'number') {
console.error('scale\uFF1A' + value + ' is invalid');
}
tmp.scale = value;
}
},
zoom: {
default: 5,
get: function get$$1() {
return tmp.zoom;
},
set: function set$$1(value) {
if (typeof value !== 'number') {
console.error('zoom\uFF1A' + value + ' is invalid');
} else if (value < 0 || value > 10) {
console.error('zoom should be ranged in 0 ~ 10');
}
tmp.zoom = value;
}
},
src: {
default: 'cropper',
get: function get$$1() {
return tmp.src;
},
set: function set$$1(value) {
if (typeof value !== 'string') {
console.error('id\uFF1A' + value + ' is invalid');
}
tmp.src = value;
}
},
cut: {
default: {},
get: function get$$1() {
return tmp.cut;
},
set: function set$$1(value) {
if ((typeof value === 'undefined' ? 'undefined' : _typeof(value)) !== 'object') {
console.error('id\uFF1A' + value + ' is invalid');
}
tmp.cut = value;
}
},
onReady: {
default: null,
get: function get$$1() {
return tmp.ready;
},
set: function set$$1(value) {
tmp.ready = value;
}
},
onBeforeImageLoad: {
default: null,
get: function get$$1() {
return tmp.beforeImageLoad;
},
set: function set$$1(value) {
tmp.beforeImageLoad = value;
}
},
onImageLoad: {
default: null,
get: function get$$1() {
return tmp.imageLoad;
},
set: function set$$1(value) {
tmp.imageLoad = value;
}
},
onBeforeDraw: {
default: null,
get: function get$$1() {
return tmp.beforeDraw;
},
set: function set$$1(value) {
tmp.beforeDraw = value;
}
}
};
/**
* Created by sail on 2017/6/11.
*/
function prepare() {
var self = this;
var _getDevice = getDevice(),
windowWidth = _getDevice.windowWidth;
self.attachPage = function () {
var pages = getCurrentPages
// 获取到当前page上下文
(); var pageContext = pages[pages.length - 1];
// 把this依附在Page上下文的wecropper属性上，便于在page钩子函数中访问
pageContext.wecropper = self;
};
self.createCtx = function () {
var id = self.id;
if (id) {
self.ctx = wx.createCanvasContext(id);
} else {
console.error('constructor: create canvas context failed, \'id\' must be valuable');
}
};
self.deviceRadio = windowWidth / 750;
}
/**
*
*/
function observer() {
var self = this;
var EVENT_TYPE = ['ready', 'beforeImageLoad', 'beforeDraw', 'imageLoad'];
self.on = function (event, fn) {
if (EVENT_TYPE.indexOf(event) > -1) {
if (typeof fn === 'function') {
event === 'ready' ? fn(self) : self['on' + firstLetterUpper(event)] = fn;
}
} else {
console.error('event: ' + event + ' is invalid');
}
return self;
};
}
/**
* Created by sail on 2017/6/11.
*/
function methods() {
var self = this;
var deviceRadio = self.deviceRadio;
var boundWidth = self.width; // 裁剪框默认宽度，即整个画布宽度
var boundHeight = self.height; // 裁剪框默认高度，即整个画布高度
var _self$cut = self.cut,
_self$cut$x = _self$cut.x,
x = _self$cut$x === undefined ? 0 : _self$cut$x,
_self$cut$y = _self$cut.y,
y = _self$cut$y === undefined ? 0 : _self$cut$y,
_self$cut$width = _self$cut.width,
width = _self$cut$width === undefined ? boundWidth : _self$cut$width,
_self$cut$height = _self$cut.height,
height = _self$cut$height === undefined ? boundHeight : _self$cut$height;
self.updateCanvas = function () {
if (self.croperTarget) {
// 画布绘制图片
self.ctx.drawImage(self.croperTarget, self.imgLeft, self.imgTop, self.scaleWidth, self.scaleHeight);
}
typeof self.onBeforeDraw === 'function' && self.onBeforeDraw(self.ctx, self);
self.setBoundStyle // 设置边界样式
(); self.ctx.draw();
return self;
};
self.pushOrign = function (src) {
self.src = src;
typeof self.onBeforeImageLoad === 'function' && self.onBeforeImageLoad(self.ctx, self);
wx.getImageInfo({
src: src,
success: function success(res) {
var innerAspectRadio = res.width / res.height;
self.croperTarget = res.path;
console.log(x, y);
if (innerAspectRadio < width / height) {
self.rectX = x;
self.baseWidth = width;
self.baseHeight = width / innerAspectRadio;
self.rectY = y - Math.abs((height - self.baseHeight) / 2);
} else {
self.rectY = y;
self.baseWidth = height * innerAspectRadio;
self.baseHeight = height;
self.rectX = x - Math.abs((width - self.baseWidth) / 2);
}
self.imgLeft = self.rectX;
self.imgTop = self.rectY;
self.scaleWidth = self.baseWidth;
self.scaleHeight = self.baseHeight;
self.updateCanvas();
typeof self.onImageLoad === 'function' && self.onImageLoad(self.ctx, self);
}
});
self.update();
return self;
};
self.getCropperImage = function () {
for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
args[_key] = arguments[_key];
}
var id = self.id;
var ARG_TYPE = toString.call(args[0]);
switch (ARG_TYPE) {
case '[object Object]':
var _args$0$quality = args[0].quality,
quality = _args$0$quality === undefined ? 10 : _args$0$quality;
if (typeof quality !== 'number') {
console.error('quality\uFF1A' + quality + ' is invalid');
} else if (quality < 0 || quality > 10) {
console.error('quality should be ranged in 0 ~ 10');
}
wx.canvasToTempFilePath({
canvasId: id,
x: x,
y: y,
width: width,
height: height,
destWidth: width * quality / (deviceRadio * 10),
destHeight: height * quality / (deviceRadio * 10),
success: function success(res) {
typeof args[args.length - 1] === 'function' && args[args.length - 1](res.tempFilePath);
}
}); break;
case '[object Function]':
wx.canvasToTempFilePath({
canvasId: id,
x: x,
y: y,
width: width,
height: height,
destWidth: width / deviceRadio,
destHeight: height / deviceRadio,
success: function success(res) {
typeof args[args.length - 1] === 'function' && args[args.length - 1](res.tempFilePath);
}
}); break;
}
return self;
};
}
/**
* Created by sail on 2017/6/11.
*/
function update() {
var self = this;
if (!self.src) return;
self.__oneTouchStart = function (touch) {
self.touchX0 = touch.x;
self.touchY0 = touch.y;
};
self.__oneTouchMove = function (touch) {
var xMove = void 0,
yMove = void 0;
//计算单指移动的距离
if (self.touchended) {
return self.updateCanvas();
}
xMove = touch.x - self.touchX0;
yMove = touch.y - self.touchY0;
var imgLeft = self.rectX + xMove;
var imgTop = self.rectY + yMove;
self.outsideBound(imgLeft, imgTop);
self.updateCanvas();
};
self.__twoTouchStart = function (touch0, touch1) {
var xMove = void 0,
yMove = void 0,
oldDistance = void 0;
self.touchX1 = self.rectX + self.scaleWidth / 2;
self.touchY1 = self.rectY + self.scaleHeight / 2;
//计算两指距离
xMove = touch1.x - touch0.x;
yMove = touch1.y - touch0.y;
oldDistance = Math.sqrt(xMove * xMove + yMove * yMove);
self.oldDistance = oldDistance;
};
self.__twoTouchMove = function (touch0, touch1) {
var xMove = void 0,
yMove = void 0,
newDistance = void 0;
var scale = self.scale,
zoom = self.zoom;
// 计算二指最新距离
xMove = touch1.x - touch0.x;
yMove = touch1.y - touch0.y;
newDistance = Math.sqrt(xMove * xMove + yMove * yMove
// 使用0.005的缩放倍数具有良好的缩放体验
); self.newScale = self.oldScale + 0.001 * zoom * (newDistance - self.oldDistance);
// 设定缩放范围
self.newScale <= 1 && (self.newScale = 1);
self.newScale >= scale && (self.newScale = scale);
self.scaleWidth = self.newScale * self.baseWidth;
self.scaleHeight = self.newScale * self.baseHeight;
var imgLeft = self.touchX1 - self.scaleWidth / 2;
var imgTop = self.touchY1 - self.scaleHeight / 2;
self.outsideBound(imgLeft, imgTop);
self.updateCanvas();
};
self.__xtouchEnd = function () {
self.oldScale = self.newScale;
self.rectX = self.imgLeft;
self.rectY = self.imgTop;
};
}
/**
* Created by sail on 2017/6/11.
*/
var handle = {
// 图片手势初始监测
touchStart: function touchStart(e) {
var self = this;
var _e$touches = slicedToArray(e.touches, 2),
touch0 = _e$touches[0],
touch1 = _e$touches[1];
setTouchState(self, true, null, null
//计算第一个触摸点的位置，并参照改点进行缩放
); self.__oneTouchStart(touch0
// 两指手势触发
); if (e.touches.length >= 2) {
self.__twoTouchStart(touch0, touch1);
}
},
// 图片手势动态缩放
touchMove: function touchMove(e) {
var self = this;
var _e$touches2 = slicedToArray(e.touches, 2),
touch0 = _e$touches2[0],
touch1 = _e$touches2[1];
setTouchState(self, null, true
// 单指手势时触发
); if (e.touches.length === 1) {
self.__oneTouchMove(touch0);
}
// 两指手势触发
if (e.touches.length >= 2) {
self.__twoTouchMove(touch0, touch1);
}
},
touchEnd: function touchEnd(e) {
var self = this;
setTouchState(self, false, false, true);
self.__xtouchEnd();
}
};
/**
* Created by sail on 1017/6/12.
*/
function cut() {
var self = this;
var deviceRadio = self.deviceRadio;
var boundWidth = self.width; // 裁剪框默认宽度，即整个画布宽度
var boundHeight = self.height;
// 裁剪框默认高度，即整个画布高度
var _self$cut = self.cut,
_self$cut$x = _self$cut.x,
x = _self$cut$x === undefined ? 0 : _self$cut$x,
_self$cut$y = _self$cut.y,
y = _self$cut$y === undefined ? 0 : _self$cut$y,
_self$cut$width = _self$cut.width,
width = _self$cut$width === undefined ? boundWidth : _self$cut$width,
_self$cut$height = _self$cut.height,
height = _self$cut$height === undefined ? boundHeight : _self$cut$height;
/**
* 设置边界
* @param imgLeft 图片左上角横坐标值
* @param imgTop 图片左上角纵坐标值
*/
self.outsideBound = function (imgLeft, imgTop) {
self.imgLeft = imgLeft >= x ? x : self.scaleWidth + imgLeft - x <= width ? x + width - self.scaleWidth : imgLeft;
self.imgTop = imgTop >= y ? y : self.scaleHeight + imgTop - y <= height ? y + height - self.scaleHeight : imgTop;
};
/**
* 设置边界样式
* @param color 边界颜色
*/
self.setBoundStyle = function () {
var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
_ref$color = _ref.color,
color = _ref$color === undefined ? '#04b00f' : _ref$color,
_ref$mask = _ref.mask,
mask = _ref$mask === undefined ? 'rgba(0, 0, 0, 0.3)' : _ref$mask,
_ref$lineWidth = _ref.lineWidth,
lineWidth = _ref$lineWidth === undefined ? 1 : _ref$lineWidth;
// 绘制半透明层
self.ctx.beginPath();
self.ctx.setFillStyle(mask);
self.ctx.fillRect(0, 0, x, boundHeight);
self.ctx.fillRect(x, 0, width, y);
self.ctx.fillRect(x, y + height, width, boundHeight - y - height);
self.ctx.fillRect(x + width, 0, boundWidth - x - width, boundHeight);
self.ctx.fill
// 设置边界左上角样式
// 为使边界样式处于边界外边缘，此时x、y均要减少lineWidth
(); self.ctx.beginPath();
self.ctx.setStrokeStyle(color);
self.ctx.setLineWidth(lineWidth);
self.ctx.moveTo(x - lineWidth, y + 10 - lineWidth);
self.ctx.lineTo(x - lineWidth, y - lineWidth);
self.ctx.lineTo(x + 10 - lineWidth, y - lineWidth);
self.ctx.stroke
// 设置边界左下角样式
// 为使边界样式处于边界外边缘，此时x要减少lineWidth、y要增加lineWidth
(); self.ctx.beginPath();
self.ctx.setStrokeStyle(color);
self.ctx.setLineWidth(lineWidth);
self.ctx.moveTo(x - lineWidth, y + height - 10 + lineWidth);
self.ctx.lineTo(x - lineWidth, y + height + lineWidth);
self.ctx.lineTo(x + 10 - lineWidth, y + height + lineWidth);
self.ctx.stroke
// 设置边界右上角样式
// 为使边界样式处于边界外边缘，此时x要增加lineWidth、y要减少lineWidth
(); self.ctx.beginPath();
self.ctx.setStrokeStyle(color);
self.ctx.setLineWidth(lineWidth);
self.ctx.moveTo(x + width - 10 + lineWidth, y - lineWidth);
self.ctx.lineTo(x + width + lineWidth, y - lineWidth);
self.ctx.lineTo(x + width + lineWidth, y + 10 - lineWidth);
self.ctx.stroke
// 设置边界右下角样式
// 为使边界样式处于边界外边缘，此时x、y均要增加lineWidth
(); self.ctx.beginPath();
self.ctx.setStrokeStyle(color);
self.ctx.setLineWidth(lineWidth);
self.ctx.moveTo(x + width + lineWidth, y + height - 10 + lineWidth);
self.ctx.lineTo(x + width + lineWidth, y + height + lineWidth);
self.ctx.lineTo(x + width - 10 + lineWidth, y + height + lineWidth);
self.ctx.stroke();
};
}
var __version__ = '1.1.4';
var weCropper = function () {
function weCropper(params) {
classCallCheck(this, weCropper);
var self = this;
var _default = {};
validator(self, DEFAULT);
Object.keys(DEFAULT).forEach(function (key) {
_default[key] = DEFAULT[key].default;
});
Object.assign(self, _default, params);
self.prepare();
self.attachPage();
self.createCtx();
self.observer();
self.cutt();
self.methods();
self.init();
self.update();
return self;
}
createClass(weCropper, [{
key: 'init',
value: function init() {
var self = this;
var src = self.src;
self.version = __version__;
typeof self.onReady === 'function' && self.onReady(self.ctx, self);
if (src) {
self.pushOrign(src);
}
setTouchState(self, false, false, false);
self.oldScale = 1;
self.newScale = 1;
return self;
}
}]);
return weCropper;
}();
Object.assign(weCropper.prototype, handle);
weCropper.prototype.prepare = prepare;
weCropper.prototype.observer = observer;
weCropper.prototype.methods = methods;
weCropper.prototype.cutt = cut;
weCropper.prototype.update = update;
return weCropper;
})));
二，图片裁剪
新建裁剪专用页面
wxml
<import src='../../../template/template.wxml' />
<cu-custom bgColor="bg-gradual-{{Theme}}" isBack="{{true}}">
<view slot="backText"><text class="cuIcon-back text-xxl"></text></view>
<view slot="content">图片裁剪</view>
</cu-custom>
<view class="cropper-wrapper">
<template is="weCropper" data="{{...cropperOpt}}" />
<view class="bottom_button padding text-center flex text-content2 justify-between align-center">
<view class="text-white" bindtap="uploadTap">
重新选择
</view>
<view class="text-white" bindtap="getCropperImage">
确定
</view>
</view>
</view>
json
{
"backgroundTextStyle":"dark",
"navigationBarBackgroundColor": "#000",
"navigationBarTitleText": "裁剪头像",
"navigationBarTextStyle":"white"
}
wxml
import weCropper from '../../../template/template.js'
const app = getApp();
const device = wx.getSystemInfoSync()
const width = device.windowWidth
const height = device.windowHeight - 50
Page({
data: {
Theme: app.globalData.Theme,
cropperOpt: {
id: 'cropper',
width,
height,
scale: 2.5,
zoom: 8,
cut: {
x: (width - 300) / 2,
y: (height - 300) / 2,
width: 300,
height: 300
}
}
},
touchStart (e) {
this.wecropper.touchStart(e)
},
touchMove (e) {
this.wecropper.touchMove(e)
},
touchEnd (e) {
this.wecropper.touchEnd(e)
},
getCropperImage () {
this.wecropper.getCropperImage((avatar) => {
if (avatar) {
// 获取到裁剪后的图片
let pages = getCurrentPages();//当前页面
let prevPage = pages[pages.length - 2];//上一页面
prevPage.upload(avatar);//返回裁剪后的图片给上一页面
wx.navigateBack({
delta: 1,//返回上一层（delta=层数）
})
} else {
console.log('获取图片失败，请稍后重试')
}
})
},
uploadTap () {
const self = this
wx.chooseImage({
count: 1, // 默认9
sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有
sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
success (res) {
let src = res.tempFilePaths[0]
// 获取裁剪图片资源后，给data添加src属性及其值
self.wecropper.pushOrign(src)
}
})
},
onLoad (option) {
// do something
const { cropperOpt } = this.data
const { src } = option
if (src) {
Object.assign(cropperOpt, { src })
new weCropper(cropperOpt)
.on('ready', function (ctx) {
console.log(`wecropper is ready for work!`)
})
.on('beforeImageLoad', (ctx) => {
console.log(`before picture loaded, i can do something`)
console.log(`current canvas context:`, ctx)
wx.showToast({
title: '上传中',
icon: 'loading',
duration: 20000
})
})
.on('imageLoad', (ctx) => {
console.log(`picture loaded`)
console.log(`current canvas context:`, ctx)
wx.hideToast()
})
}
}
})
最后返回把裁剪好的图片返回给上一页处理
js
/**处理返回裁剪后的图片 */
upload: function (avatar){
var that = this;
util.uploadImg({
url: "",
data: {},
img: avatar,
success: function (res) {
console.log(res)
wx.showToast({
title: '头像上传成功',
icon: 'loading',
duration: 1000
})
//赋值到头像框
that.setData({
comp_img: avatar
})
}
})
},
封装上传文件组件
/**头像上传-带图片裁剪
*
* util.uploadImg({
url: "接口路径",
data:{},//额外参数
img:'',//图片的本地路径
success:function(res){
console.log(res)
//赋值临时文件src到预览框<image>和返回图片src到隐藏域<input>
that.setData({
usgu_guide_cardImg: tempFilePaths,
usgu_guide_cardImg_back: res.data
})
}
})
*/
function uploadImg({url,data,img,success}){
wx.showLoading({
title: '上传中',
});
let server = app.globalData.fileURL;//正式域名
wx.uploadFile({
url: server + url,
header: { "Content-Type": "multipart/form-data", Authorization: wx.getStorageSync("sid") + enjs() },
filePath: img,
name: 'file',//这里其实是设置Key名。后台获取: $_FILES['file']
formData: data,//额外参数
success: function (res) {
//console.log(res.data);
let data_json = JSON.parse(res.data);
console.log(data_json);
if (data_json.success == 1) {
// 隐藏加载框
wx.hideLoading();
success(res)
}
else if (data_json.success == 2) {
postCode().then(function (locationData) {
console.log('重新登录回调newid：' + locationData)
//重新来
uploadImg({
url,
data,
method,
success,
})
})
}
else {
wx.hideLoading();
//其他状态多数为非法入侵，函数回馈提示后截断在当页。
wx.showModal({
title: '温馨提示',
content: res.data.error || '网络繁忙,请稍后重试！',
showCancel: false,//关闭取消按钮
})
}
},
fail: function (res) {
wx.hideToast();
wx.showModal({
title: '错误提示',
content: '上传图片失败',
showCancel: false,
success: function (res) { }
})
}
})
}
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