1390 lines
50 KiB
JavaScript
Executable File
1390 lines
50 KiB
JavaScript
Executable File
import Util from './util';
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const imageMode = ['scaleToFill', 'aspectFit', 'aspectFill', 'widthFix', 'top', 'bottom', 'center', 'left', 'right', 'top left', 'top right', 'bottom left', 'bottom right']
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class Wxml2Canvas {
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constructor (options = {}) {
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this.device = wx.getSystemInfoSync && wx.getSystemInfoSync() || {};
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if (!options.zoom) {
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this.zoom = this.device.windowWidth / 375;
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} else {
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this.zoom = options.zoom || 1;
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}
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this.element = options.element;
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this.object = options.obj;
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this.width = options.width * this.zoom || 0;
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this.height = options.height * this.zoom || 0;
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this.destZoom = options.destZoom || 3;
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this.destWidth = this.width * this.destZoom;
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this.destHeight = this.height * this.destZoom;
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this.translateX = options.translateX * this.zoom || 0;
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this.translateY = options.translateY * this.zoom || 0;
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this.gradientBackground = options.gradientBackground || null;
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this.background = options.background || '#ffffff';
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this.finishDraw = options.finish || function finish(params) {}
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this.errorHandler = options.error || function error(params) {}
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this.progress = options.progress || function progress(params) {}
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this.textAlign = options.textAlign || 'left';
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this.fullText = options.fullText || false;
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this.font = options.font || '14px PingFang SC';
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this._init();
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}
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draw (data = {}, that) {
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let self = this;
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this.data = data;
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this.fef = that;
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this.progress(10);
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this._preloadImage(data.list).then((result) => {
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this.progress(30);
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self._draw();
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}).catch((res) => {
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self.errorHandler(res);
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})
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}
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measureWidth (text, font) {
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if(font) {
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this.ctx.font = font;
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}
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let res = this.ctx.measureText(text) || {};
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return res.width || 0;
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}
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_init () {
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this.progressPercent = 0; // 绘制进度百分比
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this.data = null;
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this.ref = null;
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this.allPic = [];
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this.screenList = [];
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this.asyncList = [];
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this.imgUrl = '';
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this.progressPercent = 0;
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this.distance = 0;
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this.progress(0);
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this.ctx = wx.createCanvasContext(this.element, this.obj);
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this.ctx.font = this.font;
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this.ctx.setTextBaseline('top');
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this.ctx.setStrokeStyle('white');
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this.debug = this.device.platform === 'devtools' ? true : false;
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this._drawBakcground();
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}
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_drawBakcground () {
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if (this.gradientBackground) {
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let line = this.gradientBackground.line || [0, 0, 0, this.height];
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let color = this.gradientBackground.color || ['#fff', '#fff'];
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let style = { fill: { line, color } }
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this._drawRectToCanvas(0, 0, this.width, this.height, style);
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} else {
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let style = { fill: this.background }
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this._drawRectToCanvas(0, 0, this.width, this.height, style);
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}
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}
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_draw () {
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let self = this;
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let list = this.data.list || [];
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let index = 0;
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let all = [];
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let count = 0;
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list.forEach(item => {
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if(item.type === 'wxml') {
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count += 3;
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} else {
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count += 1;
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}
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})
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this.distance = 60 / (count || 1); // 进度条的间距
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this.progressPercent = 30;
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this.asyncList = list.filter( item => item.delay == true );
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list = list.filter( item => item.delay != true );
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drawList(list);
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Promise.all(all).then(results => {
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index = 0;
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drawList(self.asyncList, true);
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Promise.all(all).then(results => {
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self.progress(90);
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self._saveCanvasToImage();
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});
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}).catch (e => {
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self.errorHandler(e);
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});
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function drawList(list = [], noDelay) {
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list.forEach((item, i) => {
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all[index++] = new Promise((resolve, reject) => {
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let attr = item.style;
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item.progress = self.distance;
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if (noDelay) {
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item.delay = 0;
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}
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if (item.type === 'radius-image') {
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self._drawCircle(item, attr, resolve, reject, 'image');
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} else if (item.type === 'text') {
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self._drawText(item, attr, resolve, reject);
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} else if (item.type === 'line') {
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self._drawLine(item, attr, resolve, reject);
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} else if (item.type === 'circle') {
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self._drawCircle(item, attr, resolve, reject);
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} else if (item.type === 'rect') {
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self._drawRect(item, attr, resolve, reject);
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} else if (item.type === 'image') {
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self._drawRect(item, attr, resolve, reject, 'image');
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} else if (item.type === 'wxml') {
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self._drawWxml(item, attr, resolve, reject);
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}else {
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resolve();
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}
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});
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});
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}
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}
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_saveCanvasToImage () {
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let self = this;
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// 延时保存有两个原因，一个是等待绘制delay的元素，另一个是安卓上样式会错乱
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setTimeout(() => {
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self.progress(95);
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let obj = {
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x: 0,
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y: 0,
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width: self.width,
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height: self.height,
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canvasId: self.element,
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success: function (res) {
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self.progress(100);
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self.imgUrl = res.tempFilePath;
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self.finishDraw(self.imgUrl);
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},
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fail: function (res) {
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self.errorHandler({errcode: 1000, errmsg: 'save canvas error', e: res});
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}
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}
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if(self.destZoom !== 3) {
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obj.destWidth = self.destWidth;
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obj.destHeight = self.destHeight;
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}
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wx.canvasToTempFilePath(obj, self.object);
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}, self.device.system.indexOf('iOS') === -1 ? 300 : 100);
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}
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_preloadImage (list = []) {
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let self = this;
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let all = [];
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let count = 0;
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list.forEach((item, i) => {
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if (item.url && self._findPicIndex(item.url) === -1) {
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// 避免重复下载同一图片
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self.allPic.push({
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url: item.url,
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local: ''
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});
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all[count++] = new Promise((resolve, reject) => {
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// 非http(s)域名的就不下载了
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if (!/^http/.test(item.url) || /^http:\/\/(tmp)|(usr)\//.test(item.url) || /^http:\/\/127\.0\.0\.1/.test(item.url)) {
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if(item.isBase64) {
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let fileManager = wx.getFileSystemManager();
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fileManager.writeFile({
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filePath: item.url,
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data: item.isBase64.replace(/data:image\/(.*);base64,/, ''),
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encoding: 'base64',
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success (res) {
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imageInfo(item.url);
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},
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fail (res) {
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reject(res);
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},
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})
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}else {
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imageInfo(item.url);
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}
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function imageInfo (url) {
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wx.getImageInfo({
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src: url,
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success (res) {
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let index = self._findPicIndex(url);
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if(index > -1) {
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self.allPic[index].local = url;
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self.allPic[index].width = res.width;
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self.allPic[index].height = res.height;
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}
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resolve({ tempFilePath: url });
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},
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fail (res) {
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reject(res);
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}
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})
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}
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} else {
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wx.downloadFile({
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url: item.url.replace(/^https?/, 'https'),
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success: function (res) {
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wx.getImageInfo({
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src: res.tempFilePath,
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success (img) {
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let index = self._findPicIndex(item.url);
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if (index > -1) {
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self.allPic[index].local = res.tempFilePath;
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self.allPic[index].width = img.width;
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self.allPic[index].height = img.height;
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}
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resolve(res);
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},
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fail (res) {
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reject(res);
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}
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})
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},
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fail: (res) => {
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reject({errcode: 1001, errmsg: 'download pic error'});
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}
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})
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}
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})
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}
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});
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return Promise.all(all).then(results => {
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return new Promise(resolve => { resolve() })
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}).catch((results) => {
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return new Promise((resolve, reject) => { reject(results) })
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})
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}
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_findPicIndex (url) {
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let index = this.allPic.findIndex(pic => pic.url === url);
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return index;
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}
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_drawRect (item, style, resolve, reject, isImage, isWxml) {
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let zoom = this.zoom;
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let leftOffset = 0;
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let topOffset = 0;
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let width = style.width;
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let height = style.height;
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let imgWidth = style.width;
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let imgHeight = style.height;
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let mode = null;
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try {
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item.x = this._resetPositionX(item, style);
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item.y = this._resetPositionY(item, style);
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let url;
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if(isImage) {
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let index = this._findPicIndex(item.url);
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if(index > -1) {
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url = this.allPic[index].local
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imgWidth = this.allPic[index].width
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imgHeight = this.allPic[index].height
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}else {
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url = item.url;
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}
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}
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style.padding = style.padding || [];
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if(isWxml === 'inline-wxml') {
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item.x = item.x + (style.padding[3] && style.padding[3] || 0)
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item.y = item.y + (style.padding[0] && style.padding[0] || 0)
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}
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leftOffset = item.x + style.width + (style.padding[1] && style.padding[1] || 0);
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if(!isWxml) {
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width = width * zoom;
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height = height * zoom;
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}
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if(style.dataset && style.dataset.mode && imageMode.indexOf(style.dataset.mode) > -1) {
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mode = {
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type: style.dataset.mode,
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width: imgWidth,
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height: imgHeight
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};
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}
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this._drawRectToCanvas(item.x, item.y, width, height, style, url, mode);
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this._updateProgress(item.progress);
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if(resolve) {
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resolve();
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}else {
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return {
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leftOffset,
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topOffset
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}
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}
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} catch (e) {
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reject && reject({ errcode: (isImage ? 1003 : 1002), errmsg: (isImage ? 'drawImage error' : 'drawRect error'), e });
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}
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}
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_drawRectToCanvas (x, y, width, height, style, url, mode) {
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let { fill, border, boxShadow } = style;
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this.ctx.save();
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this._drawBoxShadow(boxShadow, (res) => {
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// 真机上填充渐变色时，没有阴影，先画个相等大小的纯色矩形来实现阴影
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if(fill && typeof fill !== 'string' && !this.debug) {
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this.ctx.setFillStyle(res.color || '#ffffff');
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this.ctx.fillRect(x, y, width, height);
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}
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});
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if(url) {
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// 开发者工具有bug，先不裁剪
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if(mode) {
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this._resetImageByMode(url, x, y, width, height, mode);
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}else {
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this.ctx.drawImage(url, x, y, width, height)
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}
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}else {
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this._setFill(fill, () => {
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this.ctx.fillRect(x, y, width, height);
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});
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}
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this._drawBorder(border, style, (border) => {
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let fixBorder = border.width;
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this.ctx.strokeRect(x - fixBorder / 2, y - fixBorder / 2, width + fixBorder, height + fixBorder);
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});
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this.ctx.draw(true);
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this.ctx.restore();
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}
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_resetImageByMode (url, x, y, width, height, mode) {
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let self = this;
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let offsetX = 0;
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let offsetY = 0;
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let imgWidth = mode.width;
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let imgHeight = mode.height;
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switch (mode.type) {
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case 'scaleToFill':
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imgWidth = width;
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imgHeight = height;
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self.ctx.drawImage(url, x, y, width, height)
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break;
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case 'widthFix':
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height = width / ((imgWidth || 1) / (imgHeight || 1))
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self.ctx.drawImage(url, x, y, width, height)
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break;
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case 'aspectFit':
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if(imgWidth > imgHeight) {
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let realHeight = width / ((imgWidth || 1) / (imgHeight || 1))
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offsetY = -(height - realHeight) / 2
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imgWidth = width;
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imgHeight = realHeight;
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}else {
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let realWidth = height / ((imgHeight || 1) / (imgWidth || 1))
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offsetX = -(width - realWidth) / 2
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imgWidth = realWidth;
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imgHeight = height;
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}
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_clip();
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break;
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case 'aspectFill':
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if(imgWidth > imgHeight) {
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let realWidth = imgWidth / ((imgHeight || 1) / (height || 1))
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offsetX = (realWidth - width) / 2
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imgWidth = realWidth;
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imgHeight = height;
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}else {
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let realHeight = imgHeight / ((imgWidth || 1) / (width || 1))
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offsetY = (realHeight - height) / 2
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imgWidth = width;
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imgHeight = realHeight;
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}
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_clip();
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break;
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case 'top left':
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_clip();
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break;
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case 'top':
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offsetX = (mode.width - width) / 2;
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_clip();
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break;
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case 'top right':
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offsetX = (mode.width - width);
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_clip();
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break;
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case 'left':
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offsetY = (mode.height - height) / 2;
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_clip();
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break;
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case 'center':
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offsetX = (mode.width - width) / 2;
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offsetY = (mode.height - height) / 2;
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_clip();
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break;
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case 'right':
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offsetX = (mode.width - width);
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offsetY = (mode.height - height) / 2;
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_clip();
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break;
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case 'bottom left':
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offsetY = (mode.height - height)
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_clip();
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break;
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case 'bottom':
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offsetX = (mode.width - width) / 2;
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offsetY = (mode.height - height)
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_clip();
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break;
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case 'bottom right':
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offsetX = (mode.width - width);
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offsetY = (mode.height - height)
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_clip();
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break;
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default:
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imgWidth = width;
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imgHeight = height;
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break;
|
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}
|
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function _clip () {
|
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self.ctx.save();
|
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self.ctx.beginPath()
|
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self.ctx.rect(x, y, width, height)
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self.ctx.clip();
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self.ctx.drawImage(url, x - offsetX, y - offsetY, imgWidth, imgHeight)
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self.ctx.closePath();
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self.ctx.restore();
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}
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}
|
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_drawText (item, style, resolve, reject, type, isWxml) {
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let zoom = this.zoom;
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let leftOffset = 0;
|
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let topOffset = 0;
|
||
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try {
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style.fontSize = this._parseNumber(style.fontSize);
|
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let fontSize = Math.ceil((style.fontSize || 14) * zoom)
|
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this.ctx.setTextBaseline('top');
|
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this.ctx.font = (`${style.fontWeight ? (style.fontWeight) : 'normal'} ${ fontSize }px ${ style.fontFamily || 'PingFang SC' }`);
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this.ctx.setFillStyle(style.color || '#454545');
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let text = item.text || '';
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let textWidth = Math.floor(this.measureWidth(text, style.font || this.ctx.font));
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let lineHeight = this._getLineHeight(style);
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let textHeight = Math.ceil(textWidth / (style.width || textWidth)) * lineHeight;
|
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let width = Math.ceil((style.width || textWidth) * (!isWxml ? zoom : 1));
|
||
let whiteSpace = style.whiteSpace || 'wrap';
|
||
let x = 0;
|
||
let y = 0;
|
||
|
||
if(typeof style.padding === 'string') {
|
||
style.padding = Util.transferPadding(style.padding);
|
||
}
|
||
item.x = this._resetPositionX(item, style);
|
||
item.y = this._resetPositionY(item, style, textHeight);
|
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this._drawBoxShadow(style.boxShadow);
|
||
|
||
if(style.background || style.border) {
|
||
this._drawTextBackgroud(item, style, textWidth, textHeight, isWxml);
|
||
}
|
||
|
||
// 行内文本
|
||
if(type === 'inline-text') {
|
||
width = item.maxWidth;
|
||
if(item.leftOffset + textWidth > width) {
|
||
// 如果上一个行内元素换行了，这个元素要继续在后面补足一行
|
||
let lineNum = Math.max(Math.floor(textWidth / width), 1);
|
||
let length = text.length;
|
||
let singleLength = Math.floor(length / lineNum);
|
||
let widthOffset = item.leftOffset ? item.leftOffset - item.originX : 0;
|
||
let { endIndex: currentIndex, single, singleWidth } = this._getTextSingleLine(text, width, singleLength, 0, widthOffset)
|
||
x = this._resetTextPositionX(item, style, singleWidth);
|
||
y = this._resetTextPositionY(item, style);
|
||
this.ctx.fillText(single, x, y);
|
||
leftOffset = x + singleWidth;
|
||
topOffset = y;
|
||
|
||
// 去除第一行补的内容，然后重置
|
||
text = text.substring(currentIndex, text.length);
|
||
currentIndex = 0;
|
||
lineNum = Math.max(Math.floor(textWidth / width), 1);
|
||
textWidth = Math.floor(this.measureWidth(text, style.font || this.ctx.font));
|
||
item.x = item.originX; // 还原换行后的x
|
||
for (let i = 0; i < lineNum; i++) {
|
||
let { endIndex, single, singleWidth } = this._getTextSingleLine(text, width, singleLength, currentIndex);
|
||
currentIndex = endIndex;
|
||
if(single) {
|
||
x = this._resetTextPositionX(item, style, singleWidth, width);
|
||
y = this._resetTextPositionY(item, style, i + 1);
|
||
this.ctx.fillText(single, x, y);
|
||
if(i === lineNum - 1) {
|
||
leftOffset = x + singleWidth;
|
||
topOffset = lineHeight * lineNum;
|
||
}
|
||
}
|
||
}
|
||
|
||
let last = text.substring(currentIndex, length);
|
||
let lastWidth = this.measureWidth(last);
|
||
|
||
if(last) {
|
||
x = this._resetTextPositionX(item, style, lastWidth, width);
|
||
y = this._resetTextPositionY(item, style, lineNum + 1);
|
||
this.ctx.fillText(last, x, y);
|
||
leftOffset = x + lastWidth;
|
||
topOffset = lineHeight * (lineNum + 1);
|
||
}
|
||
}else {
|
||
x = this._resetTextPositionX(item, style, textWidth, width);
|
||
y = this._resetTextPositionY(item, style);
|
||
this.ctx.fillText(item.text, x, y);
|
||
leftOffset = x + textWidth;
|
||
topOffset = lineHeight;
|
||
}
|
||
}else {
|
||
// block文本，如果文本长度超过宽度换行
|
||
if (width && textWidth > width && whiteSpace !== 'nowrap') {
|
||
let lineNum = Math.max(Math.floor(textWidth / width), 1);
|
||
let length = text.length;
|
||
let singleLength = Math.floor(length / lineNum);
|
||
let currentIndex = 0;
|
||
|
||
// lineClamp参数限制最多行数
|
||
if (style.lineClamp && lineNum + 1 > style.lineClamp) {
|
||
lineNum = style.lineClamp - 1;
|
||
}
|
||
|
||
for (let i = 0; i < lineNum; i++) {
|
||
let { endIndex, single, singleWidth } = this._getTextSingleLine(text, width, singleLength, currentIndex);
|
||
currentIndex = endIndex;
|
||
x = this._resetTextPositionX(item, style, singleWidth, width);
|
||
y = this._resetTextPositionY(item, style, i);
|
||
this.ctx.fillText(single, x, y);
|
||
|
||
}
|
||
|
||
// 换行后剩余的文字，超过一行则截断增加省略号
|
||
let last = text.substring(currentIndex, length);
|
||
let lastWidth = this.measureWidth(last);
|
||
if(lastWidth > width) {
|
||
let { single, singleWidth } = this._getTextSingleLine(last, width, singleLength);
|
||
lastWidth = singleWidth;
|
||
last = single.substring(0, single.length - 1) + '...';
|
||
}
|
||
|
||
x = this._resetTextPositionX(item, style, lastWidth, width);
|
||
y = this._resetTextPositionY(item, style, lineNum);
|
||
this.ctx.fillText(last, x, y);
|
||
|
||
}else {
|
||
x = this._resetTextPositionX(item, style, textWidth, width);
|
||
y = this._resetTextPositionY(item, style);
|
||
this.ctx.fillText(item.text, x, y);
|
||
}
|
||
}
|
||
|
||
this.ctx.draw(true);
|
||
|
||
this._updateProgress(item.progress);
|
||
|
||
if(resolve) {
|
||
resolve();
|
||
}else {
|
||
return {
|
||
leftOffset,
|
||
topOffset
|
||
}
|
||
}
|
||
} catch(e) {
|
||
reject && reject({ errcode: 1004, errmsg: 'drawText error', e: e });
|
||
}
|
||
}
|
||
|
||
_drawTextBackgroud (item, style, textWidth, textHeight, isWxml) {
|
||
if(!style.width) return;
|
||
let zoom = isWxml ? 1 : this.zoom;
|
||
let width = style.width || textWidth;
|
||
let height = style.height || textHeight;
|
||
let rectStyle = {
|
||
fill: style.background,
|
||
border: style.border
|
||
}
|
||
style.padding = style.padding || [0, 0, 0, 0];
|
||
width += (style.padding[1] || 0) + (style.padding[3] || 0);
|
||
height += (style.padding[0] || 0) + (style.padding[2] || 0);
|
||
width = width * zoom
|
||
height = height * zoom
|
||
this._drawRectToCanvas(item.x, item.y, width, height, rectStyle);
|
||
}
|
||
|
||
_drawCircle (item, style, resolve, reject, isImage, isWxml) {
|
||
let zoom = this.zoom;
|
||
let r = style.r;
|
||
try {
|
||
|
||
item.x = this._resetPositionX(item, style);
|
||
item.y = this._resetPositionY(item, style);
|
||
|
||
let url;
|
||
if(isImage) {
|
||
let index = this._findPicIndex(item.url);
|
||
if (index > -1) {
|
||
url = this.allPic[index].local;
|
||
} else {
|
||
url = item.url;
|
||
}
|
||
}
|
||
|
||
if(!isWxml) {
|
||
r = r * zoom;
|
||
}
|
||
|
||
this._drawCircleToCanvas(item.x, item.y, r, style, url);
|
||
|
||
this._updateProgress(item.progress);
|
||
resolve && resolve();
|
||
} catch (e) {
|
||
reject && reject({ errcode: (isImage ? 1006 : 1005), errmsg: (isImage ? 'drawCircleImage error' : 'drawCircle error'), e });
|
||
}
|
||
}
|
||
|
||
_drawCircleToCanvas (x, y, r, style, url) {
|
||
let { fill, border, boxShadow } = style;
|
||
|
||
this.ctx.save();
|
||
|
||
this._drawBoxShadow(boxShadow, (res) => {
|
||
// 真机上填充渐变色时，没有阴影，先画个相等大小的纯色矩形来实现阴影
|
||
if((fill && typeof fill !== 'string') || (url && res.color)) {
|
||
this.ctx.setFillStyle(res.color || '#ffffff');
|
||
this.ctx.beginPath();
|
||
this.ctx.arc(x + r, y + r, r, 0, 2 * Math.PI);
|
||
this.ctx.closePath();
|
||
this.ctx.fill();
|
||
}
|
||
});
|
||
|
||
if(url) {
|
||
this.ctx.save();
|
||
this.ctx.beginPath();
|
||
this.ctx.arc(x + r, y + r, r, 0, 2 * Math.PI);
|
||
this.ctx.clip();
|
||
this.ctx.drawImage(url, x, y, r * 2, r * 2);
|
||
this.ctx.closePath();
|
||
this.ctx.restore();
|
||
}else {
|
||
this._setFill(fill, () => {
|
||
this.ctx.beginPath();
|
||
this.ctx.arc(x + r, y + r, r, 0, 2 * Math.PI);
|
||
this.ctx.closePath();
|
||
this.ctx.fill();
|
||
});
|
||
}
|
||
|
||
this._drawBorder(border, style, (border) => {
|
||
this.ctx.beginPath()
|
||
this.ctx.arc(x + r, y + r, r + border.width / 2, 0, 2 * Math.PI)
|
||
this.ctx.stroke()
|
||
this.ctx.closePath();
|
||
});
|
||
|
||
this.ctx.draw(true);
|
||
this.ctx.restore();
|
||
}
|
||
|
||
_drawLine (item, style, resolve, reject, isWxml) {
|
||
let zoom = this.zoom;
|
||
try {
|
||
let x1 = item.x * zoom + this.translateX;
|
||
let y1 = item.y * zoom + this.translateY;
|
||
let x2 = item.x2 * zoom + this.translateX;
|
||
let y2 = item.y2 * zoom + this.translateY;
|
||
this._drawLineToCanvas(x1, y1, x2, y2, style);
|
||
|
||
this._updateProgress(item.progress);
|
||
resolve && resolve();
|
||
} catch (e) {
|
||
reject && reject({ errcode: 1007, errmsg: 'drawLine error', e });
|
||
}
|
||
}
|
||
|
||
_drawLineToCanvas (x1, y1, x2, y2, style) {
|
||
let { stroke, dash, boxShadow } = style;
|
||
|
||
this.ctx.save();
|
||
if(stroke) {
|
||
this._setStroke(stroke);
|
||
}
|
||
|
||
this._drawBoxShadow(boxShadow);
|
||
|
||
if(dash) {
|
||
let dash = [style.dash[0] || 5, style.dash[1] || 5];
|
||
let offset = style.dash[2] || 0;
|
||
this.ctx.setLineDash(dash, offset || 0);
|
||
}
|
||
|
||
this.ctx.moveTo(x1, y1);
|
||
this.ctx.setLineWidth((style.width || 1) * this.zoom);
|
||
this.ctx.lineTo(x2, y2);
|
||
this.ctx.stroke();
|
||
this.ctx.draw(true);
|
||
this.ctx.restore();
|
||
}
|
||
|
||
// 废弃，合并到_drawRect
|
||
_drawImage (item, style, resolve, reject, isWxml) {
|
||
let zoom = this.zoom;
|
||
try {
|
||
|
||
item.x = this._resetPositionX(item, style);
|
||
item.y = this._resetPositionY(item, style);
|
||
item.x = item.x + (style.padding[3] || 0);
|
||
item.y = item.y + (style.padding[0] || 0);
|
||
|
||
let index = this._findPicIndex(item.url);
|
||
let url = index > -1 ? this.allPic[index].local : item.url;
|
||
this._drawImageToCanvas(url, item.x, item.y, style.width * zoom, style.height * zoom, style);
|
||
|
||
this._updateProgress(item.progress);
|
||
resolve && resolve();
|
||
} catch (e) {
|
||
reject && reject({ errcode: 1012, errmsg: 'drawRect error', e });
|
||
}
|
||
}
|
||
|
||
// 废弃，合并到_drawRect
|
||
_drawImageToCanvas (url, x, y, width, height, style) {
|
||
let { fill, border, boxShadow } = style;
|
||
this.ctx.save();
|
||
|
||
this._drawBoxShadow(boxShadow);
|
||
this.ctx.drawImage(url, x, y, width, height);
|
||
|
||
this._drawBorder(border, style, (border) => {
|
||
let fixBorder = border.width;
|
||
this.ctx.strokeRect(x - fixBorder / 2, y - fixBorder / 2, width + fixBorder, height + fixBorder);
|
||
});
|
||
this.ctx.draw(true);
|
||
this.ctx.restore();
|
||
}
|
||
|
||
_drawWxml (item, style, resolve, reject) {
|
||
let self = this;
|
||
let all = [];
|
||
try {
|
||
this._getWxml(item, style).then((results) => {
|
||
|
||
// 上 -> 下
|
||
let sorted = self._sortListByTop(results[0]);
|
||
let count = 0;
|
||
let progress = 0;
|
||
Object.keys(sorted).forEach(item => {
|
||
count += sorted[item].length;
|
||
})
|
||
progress = this.distance * 3 / (count || 1);
|
||
|
||
all = this._drawWxmlBlock(item, sorted, all, progress, results[1]);
|
||
all = this._drawWxmlInline(item, sorted, all, progress, results[1]);
|
||
|
||
Promise.all(all).then(results => {
|
||
resolve && resolve();
|
||
}).catch (e => {
|
||
reject && reject(e);
|
||
});
|
||
});
|
||
} catch (e) {
|
||
reject && reject({ errcode: 1008, errmsg: 'drawWxml error' });
|
||
}
|
||
}
|
||
|
||
_drawWxmlBlock (item, sorted, all, progress, results) {
|
||
let self = this;
|
||
// 用来限定位置范围，取相对位置
|
||
let limitLeft = (results ? results.left : 0);
|
||
let limitTop = (results ? results.top : 0);
|
||
Object.keys(sorted).forEach((top, topIndex) => {
|
||
// 左 -> 右
|
||
let list = sorted[top].sort((a, b) => {
|
||
return (a.left - b.left);
|
||
});
|
||
|
||
list = list.filter(sub => sub.dataset.type && sub.dataset.type.indexOf('inline') === -1);
|
||
|
||
list.forEach((sub, index) => {
|
||
all[index] = new Promise((resolve2, reject2) => {
|
||
sub = self._transferWxmlStyle(sub, item, limitLeft, limitTop);
|
||
sub.progress = progress;
|
||
let type = sub.dataset.type;
|
||
if(sub.dataset.delay) {
|
||
setTimeout(() => {
|
||
drawWxmlItem();
|
||
}, sub.dataset.delay)
|
||
} else {
|
||
drawWxmlItem();
|
||
}
|
||
function drawWxmlItem () {
|
||
if (type === 'text') {
|
||
self._drawWxmlText(sub, resolve2, reject2);
|
||
} else if (type === 'image') {
|
||
self._drawWxmlImage(sub, resolve2, reject2);
|
||
} else if (type === 'radius-image') {
|
||
self._drawWxmlCircleImage(sub, resolve2, reject2);
|
||
} else if (type === 'background-image') {
|
||
self._drawWxmlBackgroundImage(sub, resolve2, reject2);
|
||
}
|
||
}
|
||
});
|
||
});
|
||
});
|
||
|
||
return all;
|
||
|
||
}
|
||
|
||
_drawWxmlInline (item, sorted, all, progress, results) {
|
||
let self = this;
|
||
let topOffset = 0;
|
||
let leftOffset = 0;
|
||
let lastTop = 0;
|
||
let limitLeft = (results ? results.left : 0);
|
||
let limitTop = (results ? results.top : 0);
|
||
let p = new Promise((resolve2, reject2) => {
|
||
let maxWidth = 0;
|
||
let minLeft = Infinity;
|
||
let maxRight = 0;
|
||
|
||
// 找出同一top下的最小left和最大right，得到最大的宽度，用于换行
|
||
Object.keys(sorted).forEach(top => {
|
||
let inlineList = sorted[top].filter(sub => sub.dataset.type && sub.dataset.type.indexOf('inline') > -1);
|
||
inlineList.forEach(sub => {
|
||
if(sub.left < minLeft) {
|
||
minLeft = sub.left
|
||
}
|
||
if(sub.right > maxRight) {
|
||
maxRight = sub.right;
|
||
}
|
||
})
|
||
});
|
||
maxWidth = Math.ceil((maxRight - minLeft) || self.width);
|
||
|
||
Object.keys(sorted).forEach((top, topIndex) => {
|
||
// 左 -> 右
|
||
let list = sorted[top].sort((a, b) => {
|
||
return (a.left - b.left);
|
||
});
|
||
|
||
// 换行的行内元素left放到后面，version2.0.6后无法获取高度，改用bottom值来判断是否换行了
|
||
let position = -1;
|
||
for(let i = 0, len = list.length; i < len; i++) {
|
||
if(list[i] && list[i + 1]) {
|
||
if(list[i].bottom > list[i + 1].bottom) {
|
||
position = i;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if(position > -1) {
|
||
list.push(list.splice(position, 1)[0]);
|
||
}
|
||
|
||
let inlineList = list.filter(sub => sub.dataset.type && sub.dataset.type.indexOf('inline') > -1);
|
||
let originLeft = (inlineList[0] ? inlineList[0].left : 0);
|
||
// 换行后和top不相等时，认为是换行了，要清除左边距；当左偏移量大于最大宽度时，也要清除左边距; 当左偏移小于左边距时，也要清除
|
||
if (Math.abs(topOffset + lastTop - top) > 2 || leftOffset - originLeft - limitLeft >= maxWidth || leftOffset <= originLeft - limitLeft - 2) {
|
||
leftOffset = 0;
|
||
}
|
||
|
||
lastTop = +top;
|
||
topOffset = 0;
|
||
|
||
inlineList.forEach((sub, index) => {
|
||
sub = self._transferWxmlStyle(sub, item, limitLeft, limitTop);
|
||
sub.progress = progress;
|
||
let type = sub.dataset.type;
|
||
if (type === 'inline-text') {
|
||
let drawRes = self._drawWxmlInlineText(sub, leftOffset, maxWidth);
|
||
leftOffset = drawRes.leftOffset;
|
||
topOffset = drawRes.topOffset;
|
||
} else if (type === 'inline-image') {
|
||
let drawRes = self._drawWxmlImage(sub) || {};
|
||
leftOffset = drawRes.leftOffset || 0;
|
||
topOffset = drawRes.topOffset || 0;
|
||
}
|
||
});
|
||
});
|
||
resolve2();
|
||
})
|
||
|
||
all.push(p);
|
||
return all;
|
||
}
|
||
|
||
_drawWxmlInlineText (sub, leftOffset = 0, maxWidth) {
|
||
let text = sub.dataset.text || '';
|
||
if(sub.dataset.maxlength && text.length > sub.dataset.maxlength) {
|
||
text = text.substring(0, sub.dataset.maxlength) + '...';
|
||
}
|
||
|
||
let textData = {
|
||
text,
|
||
originX: sub.left,
|
||
x: leftOffset ? leftOffset : sub.left,
|
||
y: sub.top,
|
||
progress: sub.progress,
|
||
leftOffset: leftOffset,
|
||
maxWidth: maxWidth // 行内元素的最大宽度，取决于limit的宽度
|
||
}
|
||
|
||
if (sub.backgroundColor !== 'rgba(0, 0, 0, 0)') {
|
||
sub.background = sub.backgroundColor;
|
||
}else {
|
||
sub.background = 'rgba(0, 0, 0, 0)';
|
||
}
|
||
|
||
if(sub.dataset.background) {
|
||
sub.background = sub.dataset.background;
|
||
}
|
||
|
||
let res = this._drawText(textData, sub, null, null, 'inline-text', 'wxml');
|
||
|
||
return res
|
||
}
|
||
|
||
_drawWxmlText (sub, resolve, reject) {
|
||
let text = sub.dataset.text || '';
|
||
if(sub.dataset.maxlength && text.length > sub.dataset.maxlength) {
|
||
text = text.substring(0, sub.dataset.maxlength) + '...';
|
||
}
|
||
|
||
let textData = {
|
||
text,
|
||
x: sub.left,
|
||
y: sub.top,
|
||
progress: sub.progress
|
||
}
|
||
if (sub.backgroundColor !== 'rgba(0, 0, 0, 0)') {
|
||
sub.background = sub.backgroundColor;
|
||
}else {
|
||
sub.background = 'rgba(0, 0, 0, 0)';
|
||
}
|
||
|
||
if(sub.dataset.background) {
|
||
sub.background = sub.dataset.background;
|
||
}
|
||
|
||
this._drawText(textData, sub, resolve, reject, 'text', 'wxml');
|
||
}
|
||
|
||
_drawWxmlImage (sub, resolve, reject) {
|
||
let imageData = {
|
||
url: sub.dataset.url,
|
||
x: sub.left,
|
||
y: sub.top,
|
||
progress: sub.progress
|
||
}
|
||
|
||
let res = this._drawRect(imageData, sub, resolve, reject, 'image', 'inline-wxml');
|
||
|
||
return res
|
||
}
|
||
|
||
_drawWxmlCircleImage (sub, resolve, reject) {
|
||
let imageData = {
|
||
url: sub.dataset.url,
|
||
x: sub.left,
|
||
y: sub.top,
|
||
progress: sub.progress
|
||
}
|
||
sub.r = sub.width / 2;
|
||
|
||
this._drawCircle(imageData, sub, resolve, reject, true, 'wxml');
|
||
}
|
||
|
||
_drawWxmlBackgroundImage (sub, resolve, reject) {
|
||
let url = sub.dataset.url;
|
||
let index = this._findPicIndex(url);
|
||
url = index > -1 ? this.allPic[index].local : url;
|
||
let size = sub.backgroundSize.replace(/px/g, '').split(' ');
|
||
|
||
let imageData = {
|
||
url: url,
|
||
x: sub.left,
|
||
y: sub.top,
|
||
progress: sub.progress
|
||
}
|
||
|
||
this._drawRect(imageData, sub, resolve, reject, 'image', 'wxml');
|
||
}
|
||
|
||
_getWxml (item, style) {
|
||
let self = this;
|
||
let query;
|
||
if(this.obj) {
|
||
query = wx.createSelectorQuery().in(this.obj);
|
||
}else {
|
||
query = wx.createSelectorQuery();
|
||
}
|
||
|
||
let p1 = new Promise((resolve, reject) => {
|
||
// 会触发两次，要限制
|
||
let count = 0;
|
||
query.selectAll(`${item.class}`).fields({
|
||
dataset: true,
|
||
size: true,
|
||
rect: true,
|
||
computedStyle: ['width', 'height', 'font', 'fontSize', 'fontFamily', 'fontWeight', 'fontStyle', 'textAlign',
|
||
'color', 'lineHeight', 'border', 'borderColor', 'borderStyle', 'borderWidth', 'verticalAlign', 'boxShadow',
|
||
'background', 'backgroundColor', 'backgroundImage', 'backgroundPosition', 'backgroundSize', 'paddingLeft', 'paddingTop',
|
||
'paddingRight', 'paddingBottom'
|
||
]
|
||
}, (res) => {
|
||
if(count++ === 0) {
|
||
let formated = self._formatImage(res);
|
||
let list = formated.list;
|
||
res = formated.res;
|
||
|
||
self._preloadImage(list).then(result => {
|
||
resolve(res);
|
||
}).catch((res) => {
|
||
reject && reject({ errcode: 1009, errmsg: 'drawWxml preLoadImage error' });
|
||
});
|
||
}
|
||
}).exec();
|
||
});
|
||
|
||
let p2 = new Promise((resolve, reject) => {
|
||
if (!item.limit) {
|
||
resolve({ top: 0, width: self.width / self.zoom });
|
||
}
|
||
|
||
query.select(`${item.limit}`).fields({
|
||
dataset: true,
|
||
size: true,
|
||
rect: true,
|
||
}, (res) => {
|
||
resolve(res);
|
||
}).exec();
|
||
});
|
||
|
||
return Promise.all([p1, p2]);
|
||
}
|
||
|
||
_getLineHeight (style) {
|
||
let zoom = this.zoom;
|
||
if(style.dataset && style.dataset.type) {
|
||
zoom = 1;
|
||
}
|
||
let lineHeight;
|
||
if(!isNaN(style.lineHeight) && style.lineHeight > style.fontSize) {
|
||
lineHeight = style.lineHeight;
|
||
}else {
|
||
style.lineHeight = (style.lineHeight || '') + '';
|
||
lineHeight = +style.lineHeight.replace('px', '');
|
||
lineHeight = lineHeight ? lineHeight : (style.fontSize || 14) * 1.2;
|
||
}
|
||
return lineHeight * zoom;
|
||
}
|
||
|
||
_formatImage (res = []) {
|
||
let list = [];
|
||
res.forEach((item, index) => {
|
||
let dataset = item.dataset;
|
||
let uid = Util.getUid();
|
||
let filename = `${wx.env.USER_DATA_PATH}/${uid}.png`;
|
||
if ((dataset.type === "image" || dataset.type === "radius-image") && dataset.url) {
|
||
let sub = {
|
||
url: dataset.base64 ? filename : dataset.url,
|
||
isBase64: dataset.base64 ? dataset.url : false
|
||
}
|
||
|
||
res[index].dataset = Object.assign(res[index].dataset, sub);
|
||
list.push(sub)
|
||
} else if (dataset.type === 'background-image' && item.backgroundImage.indexOf('url') > -1) {
|
||
let url = item.backgroundImage.replace(/url\((\"|\')?/, '').replace(/(\"|\')?\)$/, '');
|
||
let sub = {
|
||
url: dataset.base64 ? filename : url,
|
||
isBase64: dataset.base64 ? url : false
|
||
}
|
||
res[index].dataset = Object.assign(res[index].dataset, sub);
|
||
list.push(sub)
|
||
}
|
||
});
|
||
|
||
return { list, res };
|
||
}
|
||
|
||
_updateProgress (distance) {
|
||
this.progressPercent += distance;
|
||
this.progress(this.progressPercent);
|
||
}
|
||
|
||
_sortListByTop (list = []) {
|
||
let sorted = {};
|
||
|
||
// 粗略地认为2px相差的元素在同一行
|
||
list.forEach((item, index) => {
|
||
let top = item.top;
|
||
if (!sorted[top]) {
|
||
if (sorted[top - 2]) {
|
||
top = top - 2;
|
||
}else if (sorted[top - 1]) {
|
||
top = top - 1;
|
||
} else if (sorted[top + 1]) {
|
||
top = top + 1;
|
||
} else if (sorted[top + 2]) {
|
||
top = top + 2;
|
||
} else {
|
||
sorted[top] = [];
|
||
}
|
||
}
|
||
sorted[top].push(item);
|
||
});
|
||
|
||
return sorted;
|
||
}
|
||
|
||
_parseNumber (number) {
|
||
return isNaN(number) ? +(number || '').replace('px', '') : number;
|
||
}
|
||
|
||
_transferWxmlStyle (sub, item, limitLeft, limitTop) {
|
||
let leftFix = (+sub.dataset.left || 0);
|
||
let topFix = (+sub.dataset.top || 0);
|
||
|
||
sub.width = this._parseNumber(sub.width);
|
||
sub.height = this._parseNumber(sub.height);
|
||
sub.left = this._parseNumber(sub.left) - limitLeft + (leftFix + (item.x || 0)) * this.zoom;
|
||
sub.top = this._parseNumber(sub.top) - limitTop + (topFix + (item.y || 0)) * this.zoom;
|
||
|
||
let padding = sub.dataset.padding || '0 0 0 0';
|
||
if (typeof padding === 'string') {
|
||
padding = Util.transferPadding(padding);
|
||
}
|
||
let paddingTop = Number(sub.paddingTop.replace('px', '')) + Number(padding[0]);
|
||
let paddingRight = Number(sub.paddingRight.replace('px', '')) + Number(padding[1]);
|
||
let paddingBottom = Number(sub.paddingBottom.replace('px', '')) + Number(padding[2]);
|
||
let paddingLeft = Number(sub.paddingLeft.replace('px', '')) + Number(padding[3]);
|
||
sub.padding = [paddingTop, paddingRight, paddingBottom, paddingLeft];
|
||
|
||
return sub;
|
||
}
|
||
|
||
/**
|
||
* 支持负值绘制，从右边计算
|
||
* @param {*} item
|
||
* @param {*} style
|
||
*/
|
||
_resetPositionX (item, style) {
|
||
let zoom = this.zoom;
|
||
let x = 0;
|
||
|
||
if(style.dataset && style.dataset.type) {
|
||
zoom = 1;
|
||
}
|
||
|
||
// 通过wxml获取的不需要重置坐标
|
||
if (item.x < 0 && item.type) {
|
||
x = this.width + item.x * zoom - style.width * zoom;
|
||
} else {
|
||
x = item.x * zoom;
|
||
}
|
||
|
||
if (parseInt(style.borderWidth)) {
|
||
x += parseInt(style.borderWidth)
|
||
}
|
||
|
||
return x + this.translateX;
|
||
}
|
||
|
||
/**
|
||
* 支持负值绘制，从底部计算
|
||
* @param {*} item
|
||
* @param {*} style
|
||
*/
|
||
_resetPositionY (item, style, textHeight) {
|
||
let zoom = this.zoom;
|
||
let y = 0;
|
||
|
||
if(style.dataset && style.dataset.type) {
|
||
zoom = 1;
|
||
}
|
||
|
||
if (item.y < 0) {
|
||
y = this.height + item.y * zoom - (textHeight ? textHeight : style.height * zoom)
|
||
} else {
|
||
y = item.y * zoom;
|
||
}
|
||
|
||
if (parseInt(style.borderWidth)) {
|
||
y += parseInt(style.borderWidth)
|
||
}
|
||
|
||
return y + this.translateY;
|
||
}
|
||
|
||
/**
|
||
* 文字的padding、text-align
|
||
* @param {*} item
|
||
* @param {*} style
|
||
* @param {*} textWidth
|
||
*/
|
||
_resetTextPositionX (item, style, textWidth, width) {
|
||
let textAlign = style.textAlign || 'left';
|
||
let x = item.x;
|
||
if (textAlign === 'center') {
|
||
x = (width - textWidth) / 2 + item.x;
|
||
} else if (textAlign === 'right') {
|
||
x = width - textWidth + item.x;
|
||
}
|
||
|
||
let left = style.padding ? (style.padding[3] || 0) : 0;
|
||
|
||
return x + left + this.translateX;
|
||
}
|
||
|
||
/**
|
||
* 文字的padding、text-align
|
||
* @param {*} item
|
||
* @param {*} style
|
||
* @param {*} textWidth
|
||
*/
|
||
_resetTextPositionY (item, style, lineNum = 0) {
|
||
let zoom = this.zoom;
|
||
if(style.dataset && style.dataset.type) {
|
||
zoom = 1;
|
||
}
|
||
|
||
let lineHeight = this._getLineHeight(style);
|
||
let fontSize = Math.ceil((style.fontSize || 14) * zoom)
|
||
|
||
let blockLineHeightFix = (style.dataset && style.dataset.type || '').indexOf('inline') > -1 ? 0 : (lineHeight - fontSize) / 2
|
||
|
||
let top = style.padding ? (style.padding[0] || 0) : 0;
|
||
|
||
// y + lineheight偏移 + 行数 + paddingTop + 整体画布位移
|
||
return item.y + blockLineHeightFix + lineNum * lineHeight + top + this.translateY;
|
||
}
|
||
|
||
/**
|
||
* 当文本超过宽度时，计算每一行应该绘制的文本
|
||
* @param {*} text
|
||
* @param {*} width
|
||
* @param {*} singleLength
|
||
* @param {*} currentIndex
|
||
* @param {*} widthOffset
|
||
*/
|
||
_getTextSingleLine(text, width, singleLength, currentIndex = 0, widthOffset = 0) {
|
||
let offset = 0;
|
||
let endIndex = currentIndex + singleLength + offset;
|
||
let single = text.substring(currentIndex, endIndex);
|
||
let singleWidth = this.measureWidth(single);
|
||
|
||
while (Math.round(widthOffset + singleWidth) > width) {
|
||
offset--;
|
||
endIndex = currentIndex + singleLength + offset;
|
||
single = text.substring(currentIndex, endIndex);
|
||
singleWidth = this.measureWidth(single);
|
||
}
|
||
|
||
return {
|
||
endIndex,
|
||
single,
|
||
singleWidth
|
||
}
|
||
}
|
||
|
||
_drawBorder (border, style, callback) {
|
||
let zoom = this.zoom;
|
||
if(style.dataset && style.dataset.type) {
|
||
zoom = 1;
|
||
}
|
||
border = Util.transferBorder(border);
|
||
|
||
if (border && border.width) {
|
||
// 空白阴影，清空掉边框的阴影
|
||
this._drawBoxShadow();
|
||
if (border) {
|
||
|
||
this.ctx.setLineWidth(border.width * zoom);
|
||
|
||
if (border.style === 'dashed') {
|
||
let dash = style.dash || [5, 5, 0];
|
||
let offset = dash[2] || 0;
|
||
let array = [dash[0] || 5, dash[1] || 5];
|
||
this.ctx.setLineDash(array, offset);
|
||
}
|
||
this.ctx.setStrokeStyle(border.color);
|
||
}
|
||
callback && callback(border);
|
||
}
|
||
}
|
||
|
||
_drawBoxShadow (boxShadow, callback) {
|
||
boxShadow = Util.transferBoxShadow(boxShadow);
|
||
if (boxShadow) {
|
||
this.ctx.setShadow(boxShadow.offsetX, boxShadow.offsetY, boxShadow.blur, boxShadow.color);
|
||
}else {
|
||
this.ctx.setShadow(0, 0, 0, '#ffffff');
|
||
}
|
||
|
||
callback && callback(boxShadow || {});
|
||
}
|
||
|
||
_setFill (fill, callback) {
|
||
if(fill) {
|
||
if (typeof fill === 'string') {
|
||
this.ctx.setFillStyle(fill);
|
||
} else {
|
||
let line = fill.line;
|
||
let color = fill.color;
|
||
let grd = this.ctx.createLinearGradient(line[0], line[1], line[2], line[3]);
|
||
grd.addColorStop(0, color[0]);
|
||
grd.addColorStop(1, color[1]);
|
||
this.ctx.setFillStyle(grd);
|
||
}
|
||
callback && callback();
|
||
}
|
||
}
|
||
|
||
_setStroke (stroke, callback) {
|
||
if(stroke) {
|
||
if (typeof stroke === 'string') {
|
||
this.ctx.setStrokeStyle(stroke);
|
||
} else {
|
||
let line = stroke.line;
|
||
let color = stroke.color;
|
||
let grd = this.ctx.createLinearGradient(line[0], line[1], line[2], line[3]);
|
||
grd.addColorStop(0, color[0]);
|
||
grd.addColorStop(1, color[1]);
|
||
this.ctx.setStrokeStyle(grd);
|
||
}
|
||
|
||
callback && callback();
|
||
}
|
||
}
|
||
}
|
||
|
||
export default Wxml2Canvas; |