Alhan
72c35a8a26
- _imageSize reset on image switch (wrong swap threshold on nav) - downsample caps both dims (tall images no longer full-res decode) - single _readImageSize instead of leaking loadingBuilder listeners - evict old downsample provider on full-res swap - remove imageCache.clear() that dropped live image (gallery flash)
115 lines
3.1 KiB
Dart
115 lines
3.1 KiB
Dart
import 'dart:io';
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import 'package:flutter/material.dart';
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class ImageManager extends ChangeNotifier {
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static final ImageManager _instance = ImageManager._();
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static ImageManager get instance => _instance;
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ImageManager._();
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static const _supportedExtensions = [
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'png', 'jpg', 'jpeg', 'jfif', 'jpe', 'webp', 'bmp', 'gif', 'wbmp',
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];
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final List<String> _images = [];
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int _currentIndex = 0;
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bool _sortByName = false;
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List<String> get images => List.unmodifiable(_images);
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int get currentIndex => _currentIndex;
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int get imageCount => _images.length;
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bool get sortByName => _sortByName;
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String get currentImagePath {
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if (_images.isEmpty) return '';
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return _images[_currentIndex];
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}
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/// Açılan resmin bulunduğu klasörü galeri olarak kurar (en yeni önce).
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void setGalleryFromPaths(List<String> paths) {
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String? anchor;
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for (final p in paths) {
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final ext = p.toLowerCase().split('.').last;
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if (_supportedExtensions.contains(ext) && File(p).existsSync()) {
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anchor = p;
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break;
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}
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}
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if (anchor == null) return;
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final dir = File(anchor).parent;
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if (!dir.existsSync()) return;
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final List<(String, DateTime)> entries = [];
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for (final entity in dir.listSync()) {
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if (entity is! File) continue;
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final p = entity.path;
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final ext = p.toLowerCase().split('.').last;
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if (!_supportedExtensions.contains(ext)) continue;
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try {
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entries.add((p, entity.lastModifiedSync()));
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} catch (_) {}
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}
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entries.sort((a, b) {
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if (_sortByName) {
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return a.$1.toLowerCase().compareTo(b.$1.toLowerCase());
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}
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final byDate = b.$2.compareTo(a.$2);
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return byDate != 0 ? byDate : a.$1.compareTo(b.$1);
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});
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_images
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..clear()
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..addAll(entries.map((e) => e.$1));
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_currentIndex = _images.indexOf(anchor);
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if (_currentIndex < 0) {
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final base = anchor.split(Platform.pathSeparator).last;
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_currentIndex = _images
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.indexWhere((p) => p.split(Platform.pathSeparator).last == base);
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}
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if (_currentIndex < 0) _currentIndex = 0;
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notifyListeners();
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}
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void setSortByName(bool value) {
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if (_sortByName == value) return;
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_sortByName = value;
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if (_images.isNotEmpty) {
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setGalleryFromPaths([_images[_currentIndex]]);
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} else {
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notifyListeners();
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}
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}
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void setCurrentIndex(int index) {
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if (index < 0 || index >= _images.length) return;
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_currentIndex = index;
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notifyListeners();
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}
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void previousImage() {
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if (_images.isEmpty) return;
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_currentIndex = (_currentIndex - 1 + _images.length) % _images.length;
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notifyListeners();
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}
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void nextImage() {
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if (_images.isEmpty) return;
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_currentIndex = (_currentIndex + 1) % _images.length;
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notifyListeners();
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}
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/// Configure image cache for high-res images
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static void configureCache() {
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PaintingBinding.instance.imageCache.maximumSize = 16;
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PaintingBinding.instance.imageCache.maximumSizeBytes = 256 * 1024 * 1024; // 256 MB
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}
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void clear() {
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_images.clear();
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_currentIndex = 0;
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notifyListeners();
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}
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}
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