55 lines
1.6 KiB
Dart
55 lines
1.6 KiB
Dart
import 'dart:convert';
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import 'dart:io';
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import 'package:flutter/material.dart';
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/// Persists and restores window position and size.
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class WindowPersistence {
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static File get _configFile {
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String dir;
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if (Platform.isWindows) {
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dir = '${Platform.environment['APPDATA'] ?? Platform.environment['USERPROFILE'] ?? '.'}/imajviewer';
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} else {
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dir = '${Platform.environment['HOME'] ?? '/tmp'}/.config/imajviewer';
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}
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return File('$dir/window.json');
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}
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/// Save window rect synchronously (safe to call before destroy).
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static void saveSync({
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required Offset position,
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required Size size,
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}) {
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final file = _configFile;
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file.parent.createSync(recursive: true);
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file.writeAsStringSync(jsonEncode({
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'x': position.dx.toInt(),
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'y': position.dy.toInt(),
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'width': size.width.toInt(),
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'height': size.height.toInt(),
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}));
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}
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/// Restore saved window rect. Returns null if no saved config.
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static ({Offset position, Size size})? restore() {
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final file = _configFile;
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if (!file.existsSync()) return null;
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try {
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final data = jsonDecode(file.readAsStringSync()) as Map<String, dynamic>;
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final x = (data['x'] as num?)?.toDouble() ?? 0;
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final y = (data['y'] as num?)?.toDouble() ?? 0;
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final w = (data['width'] as num?)?.toDouble() ?? 1280;
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final h = (data['height'] as num?)?.toDouble() ?? 800;
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if (w < 200 || h < 200 || x < -1000 || y < -1000) return null;
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return (
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position: Offset(x, y),
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size: Size(w, h),
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);
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} catch (_) {
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return null;
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}
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}
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}
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