fix: çift tıklama BoxFit cover/contain toggle

lib/widgets/image_canvas.dart

@@ -14,30 +14,13 @@ class ImageCanvas extends StatefulWidget {
 class _ImageCanvasState extends State<ImageCanvas> {
   late TransformationController _controller;
   double _currentScale = 1.0;
-  bool _isFilled = false; // false = fit, true = fill screen
-  Size? _imageSize;
-  Size? _viewportSize;
+  bool _isFilled = false; // false=fit, true=cover
 
   @override
   void initState() {
     super.initState();
     _controller = TransformationController();
     _controller.addListener(_onTransformChanged);
-    _loadImageSize();
-  }
-
-  void _loadImageSize() {
-    final image = Image.file(File(widget.filePath));
-    image.image.resolve(const ImageConfiguration()).addListener(
-      ImageStreamListener((info, _) {
-        setState(() {
-          _imageSize = Size(
-            info.image.width.toDouble(),
-            info.image.height.toDouble(),
-          );
-        });
-      }),
-    );
   }
 
   @override
@@ -45,7 +28,6 @@ class _ImageCanvasState extends State<ImageCanvas> {
     super.didUpdateWidget(oldWidget);
     if (oldWidget.filePath != widget.filePath) {
       _resetView();
-      _loadImageSize();
     }
   }
 
@@ -60,31 +42,11 @@ class _ImageCanvasState extends State<ImageCanvas> {
   }
 
   void _toggleFillFit() {
-    if (_imageSize == null || _viewportSize == null) return;
-
-    if (_isFilled) {
-      // Go to fit mode — reset transform
+    setState(() {
+      _isFilled = !_isFilled;
       _controller.value = Matrix4.identity();
       _currentScale = 1.0;
-      _isFilled = false;
-    } else {
-      // Go to fill mode — scale to cover viewport
-      final scaleX = _viewportSize!.width / _imageSize!.width;
-      final scaleY = _viewportSize!.height / _imageSize!.height;
-      final fillScale = scaleX > scaleY ? scaleX : scaleY;
-
-      // Center the image
-      final offsetX = (_viewportSize!.width - _imageSize!.width * fillScale) / 2;
-      final offsetY = (_viewportSize!.height - _imageSize!.height * fillScale) / 2;
-
-      _controller.value = Matrix4.identity()
-        // ignore: deprecated_member_use
-        ..translate(offsetX, offsetY)
-        // ignore: deprecated_member_use
-        ..scale(fillScale);
-      _currentScale = fillScale;
-      _isFilled = true;
-    }
+    });
   }
 
   void _handleDoubleTap() {
@@ -95,8 +57,6 @@ class _ImageCanvasState extends State<ImageCanvas> {
     final renderBox = context.findRenderObject() as RenderBox?;
     if (renderBox == null) return;
 
-    _viewportSize = renderBox.size;
-
     final localPosition = renderBox.globalToLocal(event.position);
 
     final delta = event.scrollDelta.dy;
@@ -137,7 +97,6 @@ class _ImageCanvasState extends State<ImageCanvas> {
   Widget build(BuildContext context) {
     return LayoutBuilder(
       builder: (context, constraints) {
-        _viewportSize = Size(constraints.maxWidth, constraints.maxHeight);
         return Listener(
           onPointerSignal: (event) {
             if (event is PointerScrollEvent) {
@@ -156,7 +115,7 @@ class _ImageCanvasState extends State<ImageCanvas> {
               child: Center(
                 child: Image.file(
                   File(widget.filePath),
-                  fit: BoxFit.contain,
+                  fit: _isFilled ? BoxFit.cover : BoxFit.contain,
                   filterQuality: FilterQuality.high,
                   errorBuilder: (context, error, stackTrace) {
                     return const Center(