125 lines
3.7 KiB
Dart
125 lines
3.7 KiB
Dart
import 'dart:io';
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import 'dart:typed_data';
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import 'dart:ui' as ui;
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'package:food_hub_app/widgets/common/index.dart';
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import 'package:path_provider/path_provider.dart';
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import 'package:share_plus/share_plus.dart';
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/// 截图工具类
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class ScreenshotUtil {
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static double pixelRatio = 3.0;
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static Duration delay = const Duration(milliseconds: 50);
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static String watermarkText = '来自 食光集';
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// 截图功能
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static Future<Uint8List?> captureImage({required GlobalKey globalKey}) async {
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// 等待一帧确保UI已渲染
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await Future.delayed(delay);
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final RenderObject? render = globalKey.currentContext!.findRenderObject();
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final RenderRepaintBoundary boundary = render as RenderRepaintBoundary;
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final ui.Image image = await boundary.toImage(pixelRatio: pixelRatio);
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// 添加水印
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return await _addWatermarkToImage(image);
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}
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// 添加水印到图片
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static Future<Uint8List> _addWatermarkToImage(ui.Image image) async {
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// 创建画布
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final recorder = ui.PictureRecorder();
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final canvas = Canvas(recorder);
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// 绘制原始图片
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canvas.drawImage(image, Offset.zero, Paint());
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// 添加文字水印
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_drawTextWatermark(canvas, image);
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// 生成最终图片
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final picture = recorder.endRecording();
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final watermarkedImage = await picture.toImage(image.width, image.height);
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final ByteData? byteData = await watermarkedImage.toByteData(
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format: ui.ImageByteFormat.png,
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);
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return byteData!.buffer.asUint8List();
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}
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// 绘制文字水印
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static void _drawTextWatermark(Canvas canvas, ui.Image image) {
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final textPainter = TextPainter(
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text: TextSpan(
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text: watermarkText,
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style: TextStyle(
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color: Color(0x99FFFFFF),
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fontSize: 28,
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fontFamily: 'CustomFont',
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fontWeight: FontWeight.w600,
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),
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),
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textDirection: TextDirection.ltr,
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);
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textPainter.layout(maxWidth: image.width.toDouble());
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// 计算水印位置（右下角，带边距）
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final double x = image.width - textPainter.width - 40;
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final double y = image.height - textPainter.height - 40;
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// 绘制文字背景
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final backgroundPaint =
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Paint()
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..color = const ui.Color(0x4D000000)
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..style = PaintingStyle.fill;
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// 绘制圆角矩形背景
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final backgroundRect = RRect.fromRectAndRadius(
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Rect.fromLTWH(
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x - 12,
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y - 6,
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textPainter.width + 24,
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textPainter.height + 12,
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),
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Radius.circular(6),
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);
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canvas.drawRRect(backgroundRect, backgroundPaint);
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// 绘制文字
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textPainter.paint(canvas, Offset(x, y));
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}
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// 保存图片到临时文件
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static Future<File> saveImageToFile(Uint8List bytes, String fileName) async {
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final directory = await getTemporaryDirectory();
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final File imageFile = File('${directory.path}/$fileName');
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await imageFile.writeAsBytes(bytes);
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return imageFile;
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}
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static Future<void> captureAndShare({
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required GlobalKey globalKey,
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required String fileName,
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required String shareText,
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}) async {
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try {
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final imageBytes = await captureImage(globalKey: globalKey);
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if (imageBytes != null) {
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final imageFile = await saveImageToFile(imageBytes, fileName);
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await SharePlus.instance.share(
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ShareParams(files: [XFile(imageFile.path)], text: shareText),
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);
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// 分享后删除临时文件
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await imageFile.delete();
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} else {
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showErrorToast('生成图片失败，请重试');
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}
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} catch (e) {
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showErrorToast('分享失败: $e');
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}
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}
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}
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