first commit

lib/modules/preview/opacity_dialog.dart

@@ -0,0 +1,49 @@
+import 'package:flutter/material.dart';
+
+class OpacityDialog extends StatefulWidget {
+  final double initial;
+  const OpacityDialog({super.key, required this.initial});
+  @override
+  _OpacityDialogState createState() => _OpacityDialogState();
+}
+
+class _OpacityDialogState extends State<OpacityDialog> {
+  late double val;
+  @override
+  void initState() {
+    super.initState();
+    val = widget.initial;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: Text('Opacity Watermark'),
+      content: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Slider(
+            value: val,
+            min: 0.1,
+            max: 1.0,
+            divisions: 9,
+            label: '${(val * 100).toStringAsFixed(0)}%',
+            onChanged: (v) => setState(() => val = v),
+          ),
+          SizedBox(height: 8),
+          Text('Preview: ${(val * 100).toStringAsFixed(0)}%'),
+        ],
+      ),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.pop(context),
+          child: Text('Batal'),
+        ),
+        TextButton(
+          onPressed: () => Navigator.pop(context, val),
+          child: Text('OK'),
+        ),
+      ],
+    );
+  }
+}

lib/modules/preview/preview_screen.dart

@@ -0,0 +1,103 @@
+import 'dart:io';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:photobooth_mobile_app/core/image/image_cleanup_service.dart';
+import 'package:photobooth_mobile_app/core/image/image_compositor.dart';
+import 'package:photobooth_mobile_app/core/print/print_service.dart';
+
+class PreviewScreen extends StatefulWidget {
+  final String imagePath;
+  final String frameAsset;
+  final bool isFrontCamera;
+
+  const PreviewScreen({
+    super.key,
+    required this.imagePath,
+    required this.frameAsset,
+    required this.isFrontCamera,
+  });
+
+  @override
+  State<PreviewScreen> createState() => _PreviewScreenState();
+}
+
+class _PreviewScreenState extends State<PreviewScreen> {
+  final ImageCompositor _compositor = ImageCompositor();
+  final PrintService _printer = PrintService();
+  final ImageCleanupService _cleanup = ImageCleanupService();
+
+  late String _finalPath;
+  String? _lastFinalPath;
+  bool _loading = true;
+
+  @override
+  void initState() {
+    super.initState();
+    _init();
+  }
+
+  Future<void> _init() async {
+    final dir = await getTemporaryDirectory();
+    final twibbonData = await rootBundle.load(widget.frameAsset);
+
+    await _cleanup.deleteIfExists(_lastFinalPath);
+
+    final newPath = await _compositor.composeFinalA5(
+      imagePath: widget.imagePath,
+      twibbonBytes: twibbonData.buffer.asUint8List(),
+      tempDir: dir.path,
+      isFrontCamera: widget.isFrontCamera,
+    );
+
+    _lastFinalPath = newPath;
+    _finalPath = newPath;
+
+    await _cleanup.keepLastN(tempDir: dir.path, maxFiles: 10);
+
+    if (mounted) {
+      setState(() => _loading = false);
+    }
+  }
+
+  @override
+  void dispose() {
+    _cleanup.deleteIfExists(_finalPath);
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: const Text('Pratinjau')),
+      body: Column(
+        children: [
+          Expanded(
+            child: _loading
+                ? const Center(child: CupertinoActivityIndicator())
+                : Center(
+                    child: AspectRatio(
+                      aspectRatio: 148 / 210,
+                      child: Image.file(File(_finalPath), fit: BoxFit.contain),
+                    ),
+                  ),
+          ),
+          Padding(
+            padding: const EdgeInsets.all(16),
+            child: ElevatedButton.icon(
+              icon: const Icon(Icons.print),
+              label: Text(_loading ? 'Menyiapkan...' : 'Cetak'),
+              onPressed: _loading
+                  ? null
+                  : () async {
+                      final pdfPath = await _printer.generateA5Pdf(_finalPath);
+                      await _printer.sharePdf(pdfPath);
+                    },
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}