feat: file properties in settings (resolution, size, format, modified, path)

lib/screens/viewer_screen.dart

@@ -1,6 +1,8 @@
 import 'dart:async';
 import 'dart:io';
+import 'dart:typed_data';
 import 'package:flutter/material.dart';
+import 'package:image/image.dart' as img;
 import 'package:window_manager/window_manager.dart';
 import 'package:desktop_drop/desktop_drop.dart';
 import 'package:pdf/pdf.dart';
@@ -134,6 +136,29 @@ class _ViewerScreenState extends State<ViewerScreen> with WindowListener {
                   },
                 ),
                 const Divider(color: Colors.white24, height: 24),
+                if (_hasImages) ...[
+                  Text(AppLocalizations.of(context)!.fileProperties,
+                      style: const TextStyle(color: Colors.white70, fontSize: 13)),
+                  const SizedBox(height: 4),
+                  FutureBuilder<List<(String, String)>>(
+                    future: _fileProperties(ImageManager.instance.currentImagePath),
+                    builder: (context, snap) {
+                      if (!snap.hasData) return const SizedBox(height: 20);
+                      return Column(
+                        children: snap.data!.map((r) => Padding(
+                          padding: const EdgeInsets.only(bottom: 2),
+                          child: Text.rich(
+                            TextSpan(children: [
+                              TextSpan(text: '${r.$1}: ', style: const TextStyle(color: Colors.white70, fontSize: 13)),
+                              TextSpan(text: r.$2, style: const TextStyle(color: Colors.white, fontSize: 13)),
+                            ]),
+                          ),
+                        )).toList(),
+                      );
+                    },
+                  ),
+                  const SizedBox(height: 12),
+                ],
                 Text('imajViewer $appVersion',
                     style: const TextStyle(color: Colors.white, fontSize: 15)),
                 const SizedBox(height: 4),
@@ -193,6 +218,106 @@ class _ViewerScreenState extends State<ViewerScreen> with WindowListener {
     );
   }
 
+  Future<List<(String, String)>> _fileProperties(String path) async {
+    final l10n = AppLocalizations.of(context)!;
+    final file = File(path);
+    final rows = <(String, String)>[];
+    Size? size;
+    try {
+      final stat = file.statSync();
+      const maxHead = 512 * 1024;
+      final raf = file.openSync();
+      final header = raf.readSync(stat.size < maxHead ? stat.size : maxHead);
+      raf.closeSync();
+      size = _headerPixelSize(header);
+    } catch (_) {}
+    rows.add((l10n.propResolution, size == null ? '—' : '${size!.width.toInt()} × ${size!.height.toInt()}'));
+    try {
+      rows.add((l10n.propFileSize, _fmtSize(file.statSync().size)));
+    } catch (_) {
+      rows.add((l10n.propFileSize, '—'));
+    }
+    rows.add((l10n.propFormat, path.toLowerCase().split('.').last.toUpperCase()));
+    try {
+      rows.add((l10n.propModified, _fmtDate(file.statSync().modified)));
+    } catch (_) {
+      rows.add((l10n.propModified, '—'));
+    }
+    rows.add((l10n.propPath, path));
+    return rows;
+  }
+
+  /// İlk 512 KB'dan çözünürlük (piksel decode yok).
+  /// PNG/GIF/BMP/WebP: boyut ilk 33 baytta → elle parse.
+  /// JPEG: SOF büyük APP/EXIF segmentlerinin ardından gelebilir → package:image startDecode.
+  Size? _headerPixelSize(Uint8List b) {
+    try {
+      if (b.length >= 24 && b[0] == 0x89 && b[1] == 0x50) {
+        // PNG
+        final w = (b[16] << 24) | (b[17] << 16) | (b[18] << 8) | b[19];
+        final h = (b[20] << 24) | (b[21] << 16) | (b[22] << 8) | b[23];
+        return Size(w.toDouble(), h.toDouble());
+      }
+      if (b.length >= 10 && b[0] == 0x47 && b[1] == 0x49 && b[2] == 0x46) {
+        // GIF (WBMP da GIF tabanlı olabilir)
+        final w = b[6] | (b[7] << 8);
+        final h = b[8] | (b[9] << 8);
+        return Size(w.toDouble(), h.toDouble());
+      }
+      if (b.length >= 26 && b[0] == 0x42 && b[1] == 0x4D) {
+        // BMP
+        final w = b[18] | (b[19] << 8) | (b[20] << 16) | (b[21] << 24);
+        final h = b[22] | (b[23] << 8) | (b[24] << 16) | (b[25] << 24);
+        return Size(w.toDouble(), h.abs().toDouble());
+      }
+      if (b.length >= 30 && b[0] == 0x52 && b[1] == 0x49 && b[2] == 0x46 && b[3] == 0x46 &&
+          b[8] == 0x57 && b[9] == 0x45 && b[10] == 0x42 && b[11] == 0x50) {
+        // WebP
+        if (b[12] == 0x56 && b[13] == 0x50 && b[15] == 0x58) {
+          // VP8X
+          final w = b[24] | (b[25] << 8) | (b[26] << 16);
+          final h = b[27] | (b[28] << 8) | (b[29] << 16);
+          return Size((w + 1).toDouble(), (h + 1).toDouble());
+        }
+        if (b.length >= 25 && b[12] == 0x56 && b[13] == 0x50 && b[15] == 0x4C && b[20] == 0x2F) {
+          // VP8L
+          final w = (b[21] & 0x3F) | ((b[22] & 0x0F) << 6);
+          final h = (b[23] & 0x3F) | ((b[24] & 0x0F) << 6);
+          return Size((w + 1).toDouble(), (h + 1).toDouble());
+        }
+        if (b[12] == 0x56 && b[13] == 0x50 && b[15] == 0x20) {
+          // VP8 (lossy)
+          final w = (b[26] | (b[27] << 8)) & 0x3FFF;
+          final h = (b[28] | (b[29] << 8)) & 0x3FFF;
+          return Size(w.toDouble(), h.toDouble());
+        }
+      }
+    } catch (_) {}
+    try {
+      // JPEG
+      final info = img.JpegDecoder().startDecode(b);
+      if (info != null) return Size(info.width.toDouble(), info.height.toDouble());
+    } catch (_) {}
+    return null;
+  }
+
+  String _fmtSize(int bytes) {
+    if (bytes < 1024) return '$bytes B';
+    const units = ['KB', 'MB', 'GB', 'TB'];
+    double v = bytes / 1024;
+    var i = 0;
+    while (v >= 1024 && i < units.length - 1) {
+      v /= 1024;
+      i++;
+    }
+    return '${v.toStringAsFixed(v >= 100 ? 0 : 1)} ${units[i]}';
+  }
+
+  String _fmtDate(DateTime t) {
+    String two(int n) => n.toString().padLeft(2, '0');
+    return '${t.year}-${two(t.month)}-${two(t.day)} ${two(t.hour)}:${two(t.minute)}';
+  }
+
   void _flipHorizontal() => _canvasKey.currentState?.toggleFlipH();
 
   Future<void> _cropSave() async {