更新快检报告

lib/pages/device/component/SpeedControlledGif.dart

@@ -0,0 +1,92 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+
+import 'dart:ui' as ui;
+
+import 'package:flutter/services.dart';
+
+class SpeedControlledGif extends StatefulWidget {
+  final String assetPath;
+  final double speedFactor;
+  final BoxFit? fit;
+
+  /// [speedFactor] 播放速度倍数，默认1.0，
+  /// 大于1表示加速播放，小于1表示减速播放
+  const SpeedControlledGif(
+    this.assetPath, {
+    Key? key,
+    this.speedFactor = 1.0,
+    this.fit,
+  }) : super(key: key);
+
+  @override
+  _SpeedControlledGifState createState() => _SpeedControlledGifState();
+}
+
+class _SpeedControlledGifState extends State<SpeedControlledGif> {
+  ui.Codec? _codec;
+  ui.FrameInfo? _currentFrame;
+  Timer? _timer;
+  bool _isDisposed = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _loadGif();
+  }
+
+  Future<void> _loadGif() async {
+    final data = await rootBundle.load(widget.assetPath);
+    _codec = await ui.instantiateImageCodec(data.buffer.asUint8List());
+
+    if (_isDisposed) return;
+
+    _showNextFrame();
+  }
+
+  Future<void> _showNextFrame() async {
+    if (_isDisposed || _codec == null) return;
+
+    _currentFrame = await _codec!.getNextFrame();
+
+    if (_isDisposed) return;
+
+    if (mounted) {
+      setState(() {});
+    }
+
+    // 取当前帧持续时间，单位毫秒
+    final baseDuration = _currentFrame?.duration.inMilliseconds ?? 100;
+
+    // 限制最小帧间隔，防止刷新过快
+    const minFrameDuration = 50;
+
+    // 计算实际播放帧间隔，speedFactor越大速度越快
+    final adjustedDuration = (baseDuration / widget.speedFactor)
+        .round()
+        .clamp(minFrameDuration, 10000);
+
+    _timer = Timer(Duration(milliseconds: adjustedDuration), _showNextFrame);
+  }
+
+  @override
+  void dispose() {
+    _isDisposed = true;
+    _timer?.cancel();
+    _codec?.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (_currentFrame == null) {
+      // 加载中或无帧时显示空容器或占位
+      return Container();
+    }
+    return RawImage(
+      image: _currentFrame!.image,
+      fit: widget.fit,
+    );
+  }
+}