fix: gif-player 修复_abort误杀异步回调导致彻底不播放 + 加载中提示
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@@ -4,18 +4,19 @@ const { GifReader } = require('../../utils/vendor/omggif.js');
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Component({
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properties: {
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// GIF 地址(通常是 ex.gifUrl,超分后的 720px 动图)
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// GIF 地址(通常是 ex.gifUrl,超分后的清晰动图)。
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// 组件可能在 attached 之后才拿到 src(父页面接口异步返回),用 observer 兜底重新加载。
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src: {
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type: String,
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value: '',
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// src 可能在组件 attached 之后才由父页面异步设上,用 observer 兜底重新加载
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observer(value) {
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if (value) this._load();
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}
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}
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},
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data: {
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failed: false
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failed: false,
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loading: true
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},
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lifetimes: {
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attached() {
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@@ -25,51 +26,55 @@ Component({
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this._ctx = null;
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this._rgba = null;
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this._frame = 0;
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this._loadedSrc = '';
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if (this.data.src) this._load();
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},
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detached() {
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this._abort();
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// 仅 detached 时彻底停止;不要把 _aborted 留给异步回调误判
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this._aborted = true;
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if (this._timer) { clearTimeout(this._timer); this._timer = null; }
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}
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},
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methods: {
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_abort() {
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this._aborted = true;
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// 清除上一次可能的循环定时器(不动 _aborted 标志,否则会误杀正在进行的异步请求)
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_clearTimer() {
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if (this._timer) { clearTimeout(this._timer); this._timer = null; }
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},
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// 下载 GIF 二进制并构造解码器(解耦于画布,便于画布未就绪时重试渲染)
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_load() {
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const src = this.data.src;
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if (!src || this._aborted) return;
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// 防重复:attached 与 observer 可能都触发;同一 src 只加载一次
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// 同一 src 且已解码完成则跳过,避免 attached 与 observer 重复触发
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if (this._loadedSrc === src && this._reader) return;
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this._loadedSrc = src;
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this._abort(); // 清掉上一次可能的循环定时器
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this._clearTimer();
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this.setData({ loading: true, failed: false });
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wx.request({
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url: src,
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responseType: 'arraybuffer',
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success: (res) => {
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// detached 之后才允许放弃
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if (this._aborted) return;
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try {
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this._reader = new GifReader(new Uint8Array(res.data));
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this._start();
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} catch (e) {
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console.error('[gif-player] decode fail', e);
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this.setData({ failed: true });
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this.setData({ failed: true, loading: false });
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}
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},
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fail: () => {
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if (!this._aborted) this.setData({ failed: true });
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if (!this._aborted) this.setData({ failed: true, loading: false });
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}
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});
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},
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// 等待 Canvas 2D 节点就绪(自定义组件里 attached 时可能还没布局好,最多重试 10 次)
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// 等待 Canvas 2D 节点就绪(自定义组件 attached 时可能还没布局好,最多重试 15 次)
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_start(attempt = 0) {
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if (this._aborted || !this._reader) return;
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const q = wx.createSelectorQuery().in(this);
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q.select('#gifCanvas').fields({ node: true, size: true }).exec((rs) => {
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if (this._aborted) return;
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if (!rs || !rs[0] || !rs[0].node) {
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if (attempt < 10) setTimeout(() => this._start(attempt + 1), 60);
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if (attempt < 15) setTimeout(() => this._start(attempt + 1), 60);
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return;
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}
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const canvas = rs[0].node;
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@@ -89,7 +94,7 @@ Component({
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if (this._aborted || !this._reader || !this._ctx) return;
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const r = this._reader;
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const n = r.numFrames();
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if (!n) { this.setData({ failed: true }); return; }
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if (!n) { this.setData({ failed: true, loading: false }); return; }
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try {
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// decodeAndBlitFrameRGBA 按 GIF 的 disposal 规则在 rgba 上累积绘制
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r.decodeAndBlitFrameRGBA(this._frame, this._rgba);
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@@ -98,9 +103,11 @@ Component({
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this._ctx.putImageData(img, 0, 0);
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} catch (e) {
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console.error('[gif-player] frame fail', e);
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this.setData({ failed: true });
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this.setData({ failed: true, loading: false });
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return;
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}
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// 首帧渲染完成,关闭加载提示
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if (this.data.loading) this.setData({ loading: false });
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const info = r.frameInfo(this._frame);
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// omggif 的 delay 单位是 1/100 秒,需 ×10 转毫秒;缺失时给 100ms
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const delay = (info && info.delay) ? info.delay * 10 : 100;
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