浅念
829 lines
27 KiB
Dart
829 lines
27 KiB
Dart
/// 连拍页（UI-03 页面 13 深色摄影界面；P3 计划 Task 9 / R17 连拍入队）。
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///
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/// 进入时选定目标相册与分类（相册详情 FAB 传入）；快门每张立即经准备器
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/// 入队（preparing→queued，不逐张确认）。全屏取景（恒深色 #10161E，不随
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/// 系统主题）：顶部常驻层 = 返回 + 相册名 + 待传/失败徽章 + 分类 chips
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/// （可切换，**仅影响之后拍摄**——引擎只读任务行归属）；底部 = 最近一张
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/// 缩略图（兼相册多选入口，iOS 相机惯例）+ 快门（≥72dp 白环）+ 前后摄
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/// 切换 + 闪光灯（源支持才出现）。入队成功以触觉 + 200ms 浮层轻反馈，
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/// 不逐张弹确认；退出时若有待传任务弹确认（任务在后台继续——Android
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/// 原生 WorkManager 承担，见 native_transport.dart）。
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///
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/// 相机/相册经注入点（[captureSourceFactoryProvider]/[multiImagePickerProvider]）
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/// 隔离平台通道，widget 测试注入替身驱动。
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library;
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import 'dart:async';
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import 'dart:io';
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import 'package:camera/camera.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart' show HapticFeedback;
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import '../features/albums/models.dart';
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import '../features/uploads/enqueue.dart';
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import '../features/uploads/queue_controller.dart';
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import '../l10n/app_localizations.dart';
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import '../ui/tokens.dart';
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// ── 相机源抽象（生产=camera 插件；测试替身） ─────────────────────────────
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/// 拍摄源：初始化/拍摄/预览/释放。
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abstract class CaptureSource {
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/// 初始化（权限缺失/失败抛异常；权限拒绝抛 [CameraException]）。
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Future<void> initialize();
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/// 拍摄一张（返回源文件）。
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Future<XFile> capture();
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/// 取景预览（含纵横比校正——全屏 cover 铺满，不拉伸）。
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Widget buildPreview();
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/// 释放底层资源。
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Future<void> dispose();
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/// 闪光灯能力（默认不支持——子类按硬件能力覆写；不支持则 UI 不显示
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/// 闪光开关，不提供假开关）。
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bool get supportsFlash => false;
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/// 设置闪光灯（仅 [supportsFlash] 为真时有意义；失败抛异常由调用方回滚）。
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Future<void> setFlashEnabled(bool enabled) async {}
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}
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/// 生产拍摄源：camera 插件（后摄优先，最高分辨率，静音连拍）。
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class CameraPluginSource extends CaptureSource {
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CameraPluginSource._(this._controller);
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/// 创建并初始化（[preferFront] 为真选前摄，否则后摄优先）。
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static Future<CameraPluginSource> create({bool preferFront = false}) async {
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final cameras = await availableCameras();
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if (cameras.isEmpty) {
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throw CameraException('noCamera', 'no camera available');
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}
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CameraDescription pick() => cameras.firstWhere(
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(c) => c.lensDirection ==
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(preferFront
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? CameraLensDirection.front
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: CameraLensDirection.back),
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orElse: () => cameras.first,
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);
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final controller = CameraController(pick(), ResolutionPreset.max,
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enableAudio: false);
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await controller.initialize();
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return CameraPluginSource._(controller);
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}
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final CameraController _controller;
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@override
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Future<void> initialize() async {}
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@override
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Future<XFile> capture() => _controller.takePicture();
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@override
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Widget buildPreview() {
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// 纵横比校正（§4 页面 13）：预览按传感器尺寸布局，再 cover 铺满——
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// CameraPreview 直填父约束会把画面拉扁/拉高。
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final size = _controller.value.previewSize;
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Widget preview = CameraPreview(_controller);
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if (size != null && size.width > 0 && size.height > 0) {
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preview = FittedBox(
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fit: BoxFit.cover,
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clipBehavior: Clip.hardEdge,
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child: SizedBox(width: size.width, height: size.height, child: preview),
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);
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}
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return preview;
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}
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@override
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bool get supportsFlash => true;
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@override
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Future<void> setFlashEnabled(bool enabled) => _controller.setFlashMode(
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enabled ? FlashMode.always : FlashMode.off,
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);
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@override
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Future<void> dispose() => _controller.dispose();
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}
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/// 拍摄源工厂 Provider（测试 override 为替身）。
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final captureSourceFactoryProvider =
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Provider<Future<CaptureSource> Function({bool preferFront})>(
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(ref) => CameraPluginSource.create);
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// ── 连拍页 ────────────────────────────────────────────────────────────────
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/// 连拍页参数：目标相册（相册详情 FAB 进入时固定）与分类候选。
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class CaptureTarget {
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const CaptureTarget({
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required this.accountId,
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required this.albumId,
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required this.albumTitle,
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this.categories = const <Category>[],
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});
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/// 入队账号（TaskStore 隔离键）。
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final String accountId;
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/// 目标相册 ID。
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final String albumId;
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/// 目标相册展示名（信息层常驻显示）。
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final String albumTitle;
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/// 相册分类（空 = 无可切换项，仅默认分类）。
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final List<Category> categories;
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}
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/// 连拍页。
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class CapturePage extends ConsumerStatefulWidget {
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const CapturePage({required this.target, super.key});
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final CaptureTarget target;
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@override
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ConsumerState<CapturePage> createState() => _CapturePageState();
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}
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enum _CameraPhase { loading, ready, denied, failed }
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class _CapturePageState extends ConsumerState<CapturePage> {
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CaptureSource? _source;
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_CameraPhase _phase = _CameraPhase.loading;
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/// 当前镜头方向（快门旁切换按钮翻转；重试沿用）。
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bool _preferFront = false;
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/// 闪光灯开关（源不支持则无 UI；重开相机后复位）。
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bool _flashOn = false;
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/// 最近一张拍摄文件（底部缩略图；拍摄前显示相册入口占位）。
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String? _lastShotPath;
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/// 当前分类（null = 相册默认分类；切换仅影响之后拍摄）。
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String? _categoryId;
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/// 连拍串行链：快门连点逐张落地（相机硬件本就串行）。
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Future<void> _shotTail = Future<void>.value();
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/// 入队成功短暂反馈（150-220ms 轻量动效档，§3.1）。
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bool _showEnqueuedFeedback = false;
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Timer? _feedbackTimer;
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@override
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void initState() {
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super.initState();
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_initCamera();
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}
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@override
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void dispose() {
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_feedbackTimer?.cancel();
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_source?.dispose().ignore();
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super.dispose();
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}
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Future<void> _initCamera({bool? preferFront}) async {
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final front = preferFront ?? _preferFront;
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setState(() => _phase = _CameraPhase.loading);
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try {
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final source = await ref.read(captureSourceFactoryProvider)(
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preferFront: front,
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);
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await source.initialize();
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if (!mounted) {
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await source.dispose();
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return;
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}
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_source = source;
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setState(() {
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_preferFront = front;
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_flashOn = false; // 新相机实例回默认关。
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_phase = _CameraPhase.ready;
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});
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} on Object catch (error) {
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if (!mounted) return;
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setState(() => _phase = _isPermissionDenied(error)
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? _CameraPhase.denied
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: _CameraPhase.failed);
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}
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}
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/// camera 插件的权限拒绝错误码族（CameraAccessDenied /
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/// CameraAccessDeniedWithoutRestriction 等）。
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static bool _isPermissionDenied(Object error) =>
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error is CameraException &&
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(error.code.toLowerCase().contains('denied') ||
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error.code.toLowerCase().contains('permission'));
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/// 前后摄切换：释放当前源 → 反向重建（能力缺失自然落 failed 态重试）。
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Future<void> _flipCamera() async {
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if (_phase != _CameraPhase.ready) return;
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final old = _source;
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_source = null;
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await old?.dispose();
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await _initCamera(preferFront: !_preferFront);
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}
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/// 闪光灯开关：硬件设置失败则回滚（不留假状态）。
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Future<void> _toggleFlash() async {
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final source = _source;
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if (source == null || !source.supportsFlash) return;
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final next = !_flashOn;
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try {
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await source.setFlashEnabled(next);
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if (mounted) setState(() => _flashOn = next);
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} on Object {
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// 设置失败：保持原状态（下次点击重试）。
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}
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}
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/// 快门：立即入队（R17 不逐张确认）；连点串行不丢张。
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void _shoot() {
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final source = _source;
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if (source == null || _phase != _CameraPhase.ready) return;
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final categoryId = _categoryId;
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_shotTail = _shotTail.then((_) async {
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final photo = await source.capture();
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if (!mounted) return;
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// 最近一张缩略图（拍摄原文件；缺失走占位）。
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setState(() => _lastShotPath = photo.path);
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final enqueued = await enqueueForUpload(
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ref,
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accountId: widget.target.accountId,
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albumId: widget.target.albumId,
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categoryId: categoryId,
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sourcePaths: [photo.path],
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);
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// 入队成功：短暂反馈（轻触 + 200ms 浮层），不逐张弹确认（§4.5）。
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if (enqueued > 0 && mounted) _flashEnqueued();
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}).catchError((Object _) {
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// 单张失败吞掉（连拍不中断；失败任务/错误在徽章与队列页可见）。
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});
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}
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/// 入队成功反馈：触觉轻点 + 顶部短暂浮层（200ms 后自动消退）。
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void _flashEnqueued() {
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HapticFeedback.selectionClick();
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_feedbackTimer?.cancel();
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setState(() => _showEnqueuedFeedback = true);
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_feedbackTimer = Timer(const Duration(milliseconds: 200), () {
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if (mounted) setState(() => _showEnqueuedFeedback = false);
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});
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}
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/// 相册多选入队（目标 = 当前相册与分类；入口=底部缩略图位）。
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Future<void> _pickFromGallery() async {
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final paths = await ref.read(multiImagePickerProvider)();
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if (paths.isEmpty || !mounted) return;
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final l10n = AppLocalizations.of(context);
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final messenger = ScaffoldMessenger.of(context);
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final count = await enqueueForUpload(
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ref,
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accountId: widget.target.accountId,
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albumId: widget.target.albumId,
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categoryId: _categoryId,
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sourcePaths: paths,
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);
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if (!mounted) return;
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messenger.showSnackBar(
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SnackBar(content: Text(l10n.uploadEnqueuedCount(count))),
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);
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}
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void _switchCategory(String? categoryId) {
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if (categoryId == _categoryId) return;
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setState(() => _categoryId = categoryId);
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// 归属不变提示（A15）：仅影响之后拍摄。
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ScaffoldMessenger.of(context)
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..hideCurrentSnackBar()
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..showSnackBar(
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SnackBar(content: Text(AppLocalizations.of(context).captureSwitchHint)),
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);
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}
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Future<void> _confirmExit() async {
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final l10n = AppLocalizations.of(context);
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final leave = await showDialog<bool>(
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context: context,
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builder: (dialogContext) => AlertDialog(
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title: Text(l10n.captureExitTitle),
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content: Text(
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l10n.captureExitBody(pendingCountOf(ref.read(taskCountsProvider))),
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),
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actions: [
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TextButton(
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onPressed: () => Navigator.of(dialogContext).pop(false),
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child: Text(l10n.captureKeepShooting),
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),
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FilledButton(
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onPressed: () => Navigator.of(dialogContext).pop(true),
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child: Text(l10n.captureExitConfirm),
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),
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],
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),
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);
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if (leave == true && mounted) {
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Navigator.of(context).pop();
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}
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}
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@override
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Widget build(BuildContext context) {
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final l10n = AppLocalizations.of(context);
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final counts = ref.watch(taskCountsProvider);
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final pending = pendingCountOf(counts);
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final failed = failedCountOf(counts);
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final categories = widget.target.categories;
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return PopScope(
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// 有待传任务 → 拦截退出弹确认（后台继续文案）；无任务直接退出。
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canPop: pending == 0,
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onPopInvokedWithResult: (didPop, _) {
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if (didPop) return;
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_confirmExit();
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},
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child: Scaffold(
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// 深色摄影界面恒深色（§3）：不读主题，固定 #10161E。
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backgroundColor: kColorPhotoBackdrop,
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body: Stack(
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fit: StackFit.expand,
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children: [
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_buildCameraArea(l10n),
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// 顶部常驻层：返回 + 相册 + 待传/失败徽章 + 分类 chips。
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SafeArea(
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child: Column(
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children: [
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_TopBar(
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albumTitle: widget.target.albumTitle,
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queued: pending,
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failed: failed,
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onBack: () => Navigator.of(context).maybePop(),
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),
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if (categories.isNotEmpty)
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_CategoryChips(
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categories: categories,
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categoryId: _categoryId,
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onCategorySelected: _switchCategory,
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),
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],
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),
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),
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// 入队成功短暂反馈浮层（200ms 自动消退，不逐张弹确认）。
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Positioned(
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top: 132,
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left: 0,
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right: 0,
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child: IgnorePointer(
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child: AnimatedOpacity(
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opacity: _showEnqueuedFeedback ? 1 : 0,
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duration: const Duration(milliseconds: 180),
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child: Center(
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child: Container(
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padding: const EdgeInsets.symmetric(
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horizontal: 12,
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vertical: 6,
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),
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decoration: BoxDecoration(
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color: Colors.black54,
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borderRadius: BorderRadius.circular(999),
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),
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child: Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Icon(
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Icons.check_circle,
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size: 16,
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color: Colors.white,
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),
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const SizedBox(width: 6),
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Text(
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l10n.captureEnqueuedFeedback,
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style: const TextStyle(
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color: Colors.white,
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fontSize: 13,
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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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),
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),
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),
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// 底部操作层：缩略图（=相册入口）+ 快门（+闪光灯）+ 前后切换。
|
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Positioned(
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left: 0,
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right: 0,
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bottom: 0,
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child: _BottomControls(
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enabled: _phase == _CameraPhase.ready,
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lastShotPath: _lastShotPath,
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flashSupported: _source?.supportsFlash ?? false,
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flashOn: _flashOn,
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onShutter: _shoot,
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onGallery: _pickFromGallery,
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onFlip: _flipCamera,
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onFlash: _toggleFlash,
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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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}
|
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Widget _buildCameraArea(AppLocalizations l10n) {
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final source = _source;
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switch (_phase) {
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case _CameraPhase.ready:
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return source!.buildPreview();
|
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case _CameraPhase.loading:
|
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return const Center(
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child: CircularProgressIndicator(color: Colors.white),
|
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);
|
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case _CameraPhase.denied:
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return _CameraMessageView(
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icon: Icons.no_photography_outlined,
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||
message: l10n.cameraPermissionDenied,
|
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actionLabel: l10n.retry,
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onAction: _initCamera,
|
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);
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case _CameraPhase.failed:
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return _CameraMessageView(
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icon: Icons.error_outline,
|
||
message: l10n.cameraInitFailed,
|
||
actionLabel: l10n.retry,
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onAction: _initCamera,
|
||
);
|
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}
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}
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}
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// ── 信息层组件 ────────────────────────────────────────────────────────────
|
||
|
||
/// 顶部常驻层：返回 + 相册名 + 待传/失败徽章（§4 页面 13）。
|
||
class _TopBar extends StatelessWidget {
|
||
const _TopBar({
|
||
required this.albumTitle,
|
||
required this.queued,
|
||
required this.failed,
|
||
required this.onBack,
|
||
});
|
||
|
||
final String albumTitle;
|
||
final int queued;
|
||
final int failed;
|
||
final VoidCallback onBack;
|
||
|
||
@override
|
||
Widget build(BuildContext context) {
|
||
final l10n = AppLocalizations.of(context);
|
||
return Padding(
|
||
padding: const EdgeInsets.fromLTRB(4, 4, 12, 0),
|
||
child: Row(
|
||
children: [
|
||
IconButton(
|
||
tooltip: MaterialLocalizations.of(context)
|
||
.backButtonTooltip, // 语义标签；深色界面固定白色前景。
|
||
color: Colors.white,
|
||
icon: const Icon(Icons.arrow_back),
|
||
onPressed: onBack,
|
||
),
|
||
const SizedBox(width: kSpace4),
|
||
const Icon(Icons.photo_album_outlined, size: 16, color: Colors.white70),
|
||
const SizedBox(width: 6),
|
||
Expanded(
|
||
child: Text(
|
||
albumTitle,
|
||
maxLines: 1,
|
||
overflow: TextOverflow.ellipsis,
|
||
style: const TextStyle(
|
||
color: Colors.white,
|
||
fontWeight: FontWeight.w600,
|
||
),
|
||
),
|
||
),
|
||
if (failed > 0) ...[
|
||
_Badge(
|
||
label: l10n.captureFailedBadge(failed),
|
||
color: kColorErrorDark,
|
||
foreground: Colors.white,
|
||
),
|
||
const SizedBox(width: kSpace8),
|
||
],
|
||
_Badge(
|
||
label: l10n.captureQueued(queued),
|
||
color: Colors.white24,
|
||
foreground: Colors.white,
|
||
),
|
||
],
|
||
),
|
||
);
|
||
}
|
||
}
|
||
|
||
/// 分类 chips（切换仅影响之后拍摄；A15 归属不变）。
|
||
class _CategoryChips extends StatelessWidget {
|
||
const _CategoryChips({
|
||
required this.categories,
|
||
required this.categoryId,
|
||
required this.onCategorySelected,
|
||
});
|
||
|
||
final List<Category> categories;
|
||
final String? categoryId;
|
||
final void Function(String?) onCategorySelected;
|
||
|
||
@override
|
||
Widget build(BuildContext context) {
|
||
final l10n = AppLocalizations.of(context);
|
||
return SizedBox(
|
||
height: 44,
|
||
child: ListView(
|
||
scrollDirection: Axis.horizontal,
|
||
padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
|
||
children: [
|
||
ChoiceChip(
|
||
label: Text(l10n.captureCategoryDefault),
|
||
selected: categoryId == null,
|
||
onSelected: (_) => onCategorySelected(null),
|
||
labelStyle: const TextStyle(color: Colors.white),
|
||
selectedColor: Colors.white24,
|
||
backgroundColor: Colors.black38,
|
||
),
|
||
for (final category in categories) ...[
|
||
const SizedBox(width: 8),
|
||
ChoiceChip(
|
||
label: Text(_categoryLabel(category, l10n)),
|
||
selected: categoryId == category.id,
|
||
onSelected: (_) => onCategorySelected(category.id),
|
||
labelStyle: const TextStyle(color: Colors.white),
|
||
selectedColor: Colors.white24,
|
||
backgroundColor: Colors.black38,
|
||
),
|
||
],
|
||
],
|
||
),
|
||
);
|
||
}
|
||
|
||
static String _categoryLabel(Category category, AppLocalizations l10n) {
|
||
final lang = l10n.localeName.split('-').first.toLowerCase();
|
||
CategoryTranslation? match;
|
||
for (final t in category.translations) {
|
||
if (t.locale.toLowerCase() == l10n.localeName.toLowerCase() ||
|
||
t.locale.toLowerCase().split('-').first == lang) {
|
||
match = t;
|
||
break;
|
||
}
|
||
}
|
||
if (match != null) return match.name;
|
||
return category.translations.isEmpty
|
||
? category.id
|
||
: category.translations.first.name;
|
||
}
|
||
}
|
||
|
||
/// 徽章（待传/失败计数）。
|
||
class _Badge extends StatelessWidget {
|
||
const _Badge({
|
||
required this.label,
|
||
required this.color,
|
||
required this.foreground,
|
||
});
|
||
|
||
final String label;
|
||
final Color color;
|
||
final Color foreground;
|
||
|
||
@override
|
||
Widget build(BuildContext context) {
|
||
return Container(
|
||
padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
|
||
decoration: BoxDecoration(
|
||
color: color,
|
||
borderRadius: BorderRadius.circular(999),
|
||
),
|
||
child: Text(
|
||
label,
|
||
style: TextStyle(color: foreground, fontSize: 12),
|
||
),
|
||
);
|
||
}
|
||
}
|
||
|
||
/// 底部操作层：最近一张缩略图（兼相册多选入口）+ 快门（≥72dp 白环，
|
||
/// 源支持时上方附闪光灯）+ 前后摄切换。
|
||
class _BottomControls extends StatelessWidget {
|
||
const _BottomControls({
|
||
required this.enabled,
|
||
required this.lastShotPath,
|
||
required this.flashSupported,
|
||
required this.flashOn,
|
||
required this.onShutter,
|
||
required this.onGallery,
|
||
required this.onFlip,
|
||
required this.onFlash,
|
||
});
|
||
|
||
final bool enabled;
|
||
final String? lastShotPath;
|
||
final bool flashSupported;
|
||
final bool flashOn;
|
||
final VoidCallback onShutter;
|
||
final VoidCallback onGallery;
|
||
final VoidCallback onFlip;
|
||
final VoidCallback onFlash;
|
||
|
||
@override
|
||
Widget build(BuildContext context) {
|
||
final l10n = AppLocalizations.of(context);
|
||
return IgnorePointer(
|
||
// 相机未就绪（加载/权限/失败）时收起操作层——那里是错误态的重试区。
|
||
ignoring: !enabled,
|
||
child: SafeArea(
|
||
minimum: const EdgeInsets.fromLTRB(24, 0, 24, 16),
|
||
child: Row(
|
||
crossAxisAlignment: CrossAxisAlignment.end,
|
||
children: [
|
||
Align(
|
||
alignment: AlignmentDirectional.bottomStart,
|
||
child: _LastShotButton(
|
||
lastShotPath: lastShotPath,
|
||
onPressed: onGallery,
|
||
),
|
||
),
|
||
const Spacer(),
|
||
Column(
|
||
mainAxisSize: MainAxisSize.min,
|
||
children: [
|
||
if (flashSupported)
|
||
IconButton(
|
||
tooltip: l10n.captureFlash,
|
||
color: Colors.white,
|
||
icon: Icon(flashOn ? Icons.flash_on : Icons.flash_off),
|
||
onPressed: onFlash,
|
||
),
|
||
_ShutterButton(onPressed: onShutter, enabled: enabled),
|
||
],
|
||
),
|
||
const Spacer(),
|
||
Align(
|
||
alignment: AlignmentDirectional.bottomStart,
|
||
child: IconButton(
|
||
tooltip: l10n.captureFlipCamera,
|
||
color: Colors.white,
|
||
icon: const Icon(Icons.flip_camera_ios_outlined),
|
||
onPressed: onFlip,
|
||
),
|
||
),
|
||
],
|
||
),
|
||
),
|
||
);
|
||
}
|
||
}
|
||
|
||
/// 最近一张缩略图：拍摄前为相册入口占位（photo_library 图标），拍摄后
|
||
/// 显示最近一张（缺失走占位）；点击均打开相册多选（iOS 相机惯例）。
|
||
class _LastShotButton extends StatelessWidget {
|
||
const _LastShotButton({required this.lastShotPath, required this.onPressed});
|
||
|
||
final String? lastShotPath;
|
||
final VoidCallback onPressed;
|
||
|
||
@override
|
||
Widget build(BuildContext context) {
|
||
final l10n = AppLocalizations.of(context);
|
||
Widget content;
|
||
if (lastShotPath == null) {
|
||
content = const Icon(
|
||
Icons.photo_library_outlined,
|
||
size: 24,
|
||
color: Colors.white,
|
||
);
|
||
} else {
|
||
content = Image.file(
|
||
File(lastShotPath!),
|
||
fit: BoxFit.cover,
|
||
errorBuilder: (_, _, _) => const Icon(
|
||
Icons.image_outlined,
|
||
size: 24,
|
||
color: Colors.white,
|
||
),
|
||
);
|
||
}
|
||
return IconButton(
|
||
tooltip: l10n.capturePickFromGallery,
|
||
onPressed: onPressed,
|
||
style: IconButton.styleFrom(
|
||
padding: EdgeInsets.zero,
|
||
fixedSize: const Size(56, 56),
|
||
),
|
||
icon: ClipRRect(
|
||
borderRadius: BorderRadius.circular(kRadiusBadge),
|
||
child: SizedBox(width: 48, height: 48, child: content),
|
||
),
|
||
);
|
||
}
|
||
}
|
||
|
||
/// 快门按钮（§4 页面 13：≥72dp 白环；连拍不进入模态确认，逐张自动入队）。
|
||
class _ShutterButton extends StatelessWidget {
|
||
const _ShutterButton({required this.onPressed, required this.enabled});
|
||
|
||
final VoidCallback onPressed;
|
||
final bool enabled;
|
||
|
||
@override
|
||
Widget build(BuildContext context) {
|
||
return Semantics(
|
||
button: true,
|
||
label: AppLocalizations.of(context).captureShutter,
|
||
child: IconButton(
|
||
key: const ValueKey('capture-shutter'),
|
||
onPressed: enabled ? onPressed : null,
|
||
style: IconButton.styleFrom(
|
||
padding: EdgeInsets.zero,
|
||
minimumSize: const Size(76, 76),
|
||
tapTargetSize: MaterialTapTargetSize.shrinkWrap,
|
||
),
|
||
icon: Container(
|
||
width: 76,
|
||
height: 76,
|
||
decoration: BoxDecoration(
|
||
shape: BoxShape.circle,
|
||
border: Border.all(color: Colors.white, width: 5),
|
||
),
|
||
alignment: Alignment.center,
|
||
child: Container(
|
||
width: 58,
|
||
height: 58,
|
||
decoration: BoxDecoration(
|
||
shape: BoxShape.circle,
|
||
// 就绪=白心（图标反色）；未就绪=仅白环。
|
||
color: enabled ? Colors.white : Colors.transparent,
|
||
),
|
||
alignment: Alignment.center,
|
||
child: Icon(
|
||
Icons.camera,
|
||
size: 28,
|
||
color: enabled ? kColorPhotoBackdrop : Colors.white70,
|
||
),
|
||
),
|
||
),
|
||
),
|
||
);
|
||
}
|
||
}
|
||
|
||
/// 相机不可用视图（权限拒绝/初始化失败）：深色说明 + 重试（§4 页面 13）。
|
||
class _CameraMessageView extends StatelessWidget {
|
||
const _CameraMessageView({
|
||
required this.icon,
|
||
required this.message,
|
||
required this.actionLabel,
|
||
required this.onAction,
|
||
});
|
||
|
||
final IconData icon;
|
||
final String message;
|
||
final String actionLabel;
|
||
final VoidCallback onAction;
|
||
|
||
@override
|
||
Widget build(BuildContext context) {
|
||
return Container(
|
||
color: kColorPhotoBackdrop,
|
||
child: Center(
|
||
child: Column(
|
||
mainAxisSize: MainAxisSize.min,
|
||
children: [
|
||
Icon(icon, size: 48, color: Colors.white70),
|
||
const SizedBox(height: 12),
|
||
Padding(
|
||
padding: const EdgeInsets.symmetric(horizontal: 32),
|
||
child: Text(
|
||
message,
|
||
textAlign: TextAlign.center,
|
||
style: const TextStyle(color: Colors.white),
|
||
),
|
||
),
|
||
const SizedBox(height: 16),
|
||
FilledButton.icon(
|
||
onPressed: onAction,
|
||
icon: const Icon(Icons.refresh),
|
||
label: Text(actionLabel),
|
||
),
|
||
],
|
||
),
|
||
),
|
||
);
|
||
}
|
||
}
|