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https://github.com/zjs81/meshcore-open.git
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feat: Add community management features with QR code scanning
- Implement Community model for managing community data, including secret handling and PSK derivation. - Create CommunityQrScannerScreen for scanning and joining communities via QR codes. - Develop CommunityStore for persisting community data using SharedPreferences. - Introduce QrCodeDisplay widget for displaying QR codes with customizable options. - Add QrScannerWidget for reusable QR code scanning functionality with validation and controls.
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zjs81
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import 'package:flutter/material.dart';
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import 'package:qr_flutter/qr_flutter.dart';
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/// A reusable QR code display widget for sharing data.
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///
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/// Features:
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/// - Configurable size and colors
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/// - Optional logo/icon in center
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/// - Automatic theming (light/dark mode aware)
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/// - Title and instructions
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class QrCodeDisplay extends StatelessWidget {
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/// The data to encode in the QR code
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final String data;
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/// Size of the QR code (width and height)
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final double size;
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/// Optional widget to display in the center (e.g., app logo)
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final Widget? embeddedImage;
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/// Size of the embedded image (if provided)
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final double embeddedImageSize;
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/// Title displayed above the QR code
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final String? title;
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/// Instructions displayed below the QR code
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final String? instructions;
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/// Background color of the QR code (defaults to white)
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final Color? backgroundColor;
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/// Foreground color of the QR code modules (defaults to black)
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final Color? foregroundColor;
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/// Padding around the QR code
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final EdgeInsets padding;
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/// Error correction level
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final int errorCorrectionLevel;
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const QrCodeDisplay({
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super.key,
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required this.data,
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this.size = 200,
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this.embeddedImage,
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this.embeddedImageSize = 50,
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this.title,
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this.instructions,
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this.backgroundColor,
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this.foregroundColor,
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this.padding = const EdgeInsets.all(16),
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this.errorCorrectionLevel = QrErrorCorrectLevel.M,
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});
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@override
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Widget build(BuildContext context) {
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final theme = Theme.of(context);
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final isDark = theme.brightness == Brightness.dark;
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// Default colors based on theme
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final bgColor = backgroundColor ?? Colors.white;
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final fgColor = foregroundColor ?? Colors.black;
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return Padding(
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padding: padding,
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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if (title != null) ...[
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Text(
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title!,
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style: theme.textTheme.titleLarge?.copyWith(
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fontWeight: FontWeight.bold,
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),
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textAlign: TextAlign.center,
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),
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const SizedBox(height: 16),
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],
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// QR code container with rounded corners
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Container(
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padding: const EdgeInsets.all(16),
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decoration: BoxDecoration(
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color: bgColor,
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borderRadius: BorderRadius.circular(16),
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boxShadow: isDark
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? null
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: [
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BoxShadow(
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color: Colors.black.withValues(alpha: 0.1),
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blurRadius: 10,
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offset: const Offset(0, 4),
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),
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],
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),
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child: embeddedImage != null
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? _buildQrWithEmbeddedImage(fgColor, bgColor)
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: _buildSimpleQr(fgColor, bgColor),
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),
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if (instructions != null) ...[
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const SizedBox(height: 16),
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Text(
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instructions!,
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style: theme.textTheme.bodyMedium?.copyWith(
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color: theme.colorScheme.onSurfaceVariant,
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),
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textAlign: TextAlign.center,
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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 _buildSimpleQr(Color fgColor, Color bgColor) {
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return QrImageView(
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data: data,
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version: QrVersions.auto,
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size: size,
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backgroundColor: bgColor,
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errorCorrectionLevel: errorCorrectionLevel,
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eyeStyle: QrEyeStyle(
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eyeShape: QrEyeShape.square,
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color: fgColor,
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),
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dataModuleStyle: QrDataModuleStyle(
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dataModuleShape: QrDataModuleShape.square,
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color: fgColor,
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),
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);
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}
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Widget _buildQrWithEmbeddedImage(Color fgColor, Color bgColor) {
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return Stack(
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alignment: Alignment.center,
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children: [
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QrImageView(
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data: data,
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version: QrVersions.auto,
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size: size,
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backgroundColor: bgColor,
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// Use higher error correction when embedding image
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errorCorrectionLevel: QrErrorCorrectLevel.H,
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eyeStyle: QrEyeStyle(
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eyeShape: QrEyeShape.square,
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color: fgColor,
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),
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dataModuleStyle: QrDataModuleStyle(
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dataModuleShape: QrDataModuleShape.square,
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color: fgColor,
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),
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),
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Container(
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width: embeddedImageSize,
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height: embeddedImageSize,
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decoration: BoxDecoration(
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color: bgColor,
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borderRadius: BorderRadius.circular(8),
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),
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padding: const EdgeInsets.all(4),
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child: embeddedImage,
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),
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],
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);
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}
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}
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/// Dialog to display a QR code for sharing
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class QrCodeShareDialog extends StatelessWidget {
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final String data;
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final String? title;
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final String? instructions;
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final Widget? embeddedImage;
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const QrCodeShareDialog({
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super.key,
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required this.data,
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this.title,
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this.instructions,
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this.embeddedImage,
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});
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@override
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Widget build(BuildContext context) {
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return Dialog(
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child: Padding(
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padding: const EdgeInsets.all(24),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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QrCodeDisplay(
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data: data,
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size: 250,
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title: title,
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instructions: instructions,
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embeddedImage: embeddedImage,
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padding: EdgeInsets.zero,
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),
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const SizedBox(height: 24),
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SizedBox(
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width: double.infinity,
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child: FilledButton(
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onPressed: () => Navigator.pop(context),
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child: const Text('Done'),
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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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/// Show the dialog
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static Future<void> show({
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required BuildContext context,
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required String data,
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String? title,
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String? instructions,
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Widget? embeddedImage,
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}) {
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return showDialog(
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context: context,
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builder: (context) => QrCodeShareDialog(
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data: data,
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title: title,
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instructions: instructions,
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embeddedImage: embeddedImage,
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),
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);
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}
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}
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