161 lines
4.8 KiB
Dart
161 lines
4.8 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:get/get.dart';
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import 'package:getx_scaffold/getx_scaffold.dart';
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import 'package:qr_code_scanner_plus/qr_code_scanner_plus.dart';
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import 'controller.dart';
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class QrCodePage extends GetView<QrCodeController> {
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const QrCodePage({Key? key}) : super(key: key);
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@override
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Widget build(BuildContext context) {
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return GetBuilder<QrCodeController>(
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init: QrCodeController(),
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id: 'qrcode',
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builder: (_) {
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return Scaffold(
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extendBodyBehindAppBar: true,
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appBar: AppBar(
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title: const Text('扫码', style: TextStyle(color: Colors.white)),
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centerTitle: true,
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backgroundColor: Colors.transparent,
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elevation: 0,
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leading: IconButton(
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icon: const Icon(Icons.arrow_back_ios, color: Colors.white),
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onPressed: () => Get.back(),
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),
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actions: [
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TextButton(
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onPressed: controller.requestPhotoPermission,
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child: const Text(
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'相册',
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style: TextStyle(color: Colors.white, fontSize: 16),
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),
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),
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],
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),
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body: Stack(
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children: <Widget>[
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_buildQrView(context),
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Positioned(
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bottom: 80.h,
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left: 0,
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right: 0,
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child: _buildControlButtons(),
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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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/// 构建二维码扫描视图（带动画）
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Widget _buildQrView(BuildContext context) {
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// 定义扫描区域的大小
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var scanArea = (MediaQuery.of(context).size.width < 400 ||
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MediaQuery.of(context).size.height < 400)
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? 250.0
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: 300.0;
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return Stack(
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alignment: Alignment.center,
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children: <Widget>[
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// 底层是相机视图和半透明遮罩
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QRView(
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key: controller.qrKey,
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onQRViewCreated: controller.onQRViewCreated,
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overlay: QrScannerOverlayShape(
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borderColor: Colors.blueAccent,
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borderRadius: 10,
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borderLength: 30,
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borderWidth: 10,
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cutOutSize: scanArea,
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),
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),
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// 上层是扫描动画
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AnimatedBuilder(
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animation: controller.scanAnimation,
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builder: (context, child) {
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return Positioned(
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// 计算扫描框的顶部位置，以便动画从顶部开始
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top: (MediaQuery.of(context).size.height - scanArea) / 2,
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child: Transform.translate(
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offset: Offset(0, controller.scanAnimation.value * scanArea),
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child: Container(
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width: scanArea,
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height: 2, // 扫描线的高度
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decoration: BoxDecoration(
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color: Colors.blueAccent,
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boxShadow: [
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BoxShadow(
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color: Colors.blueAccent.withOpacity(0.7),
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blurRadius: 8,
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spreadRadius: 2,
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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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);
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}
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/// 构建底部的控制按钮
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Widget _buildControlButtons() {
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return Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Text(
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'将二维码/条形码放入框内，即可自动扫描',
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style: TextStyle(color: Colors.white, fontSize: 14),
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),
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const SizedBox(height: 20),
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Row(
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mainAxisAlignment: MainAxisAlignment.spaceEvenly,
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crossAxisAlignment: CrossAxisAlignment.center,
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children: <Widget>[
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// 闪光灯按钮
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_buildIconButton(
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onPressed: controller.toggleFlash,
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//闪光灯状态的变化
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child: Obx(() => Icon(
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controller.isFlashOn.value ? Icons.flash_on : Icons.flash_off,
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color: Colors.white,
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size: 28,
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)),
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),
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// 翻转相机按钮
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_buildIconButton(
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onPressed: controller.flipCamera,
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child: const Icon(
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Icons.flip_camera_ios,
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color: Colors.white,
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size: 28,
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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 _buildIconButton({required VoidCallback onPressed, required Widget child}) {
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return Container(
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decoration: BoxDecoration(
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color: Colors.black.withOpacity(0.3),
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shape: BoxShape.circle,
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),
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child: IconButton(
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onPressed: onPressed,
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icon: child,
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iconSize: 32, // 增大点击区域
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),
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);
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}
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}
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