修复图片预览 添加双击复原手势

lib/utils/as_grid_image_view.dart

@@ -32,7 +32,8 @@ class AsGridImageView extends StatelessWidget {
         children: files == null
             ? nets!
                 .map((e) => GestureDetector(
-                      onTap: () => PhotoViewer.toNet(
+                      onTap: () => PhotoViewer.fromNet(
+                        context,
                         tag: e,
                         net: e,
                       ),
@@ -45,7 +46,8 @@ class AsGridImageView extends StatelessWidget {
                 .toList()
             : files!
                 .map((e) => GestureDetector(
-                      onTap: () => PhotoViewer.toFile(tag: e.path, file: e),
+                      onTap: () =>
+                          PhotoViewer.fromFile(context, tag: e.path, file: e),
                       child: Hero(tag: e.path, child: Image.file(e)),
                     ))
                 .toList());

lib/utils/photo_viewer.dart

@@ -55,16 +55,59 @@ class PhotoViewer extends StatefulWidget {
   _PhotoViewerState createState() => _PhotoViewerState();
 }
 
-class _PhotoViewerState extends State<PhotoViewer> {
+class _PhotoViewerState extends State<PhotoViewer>
+    with SingleTickerProviderStateMixin {
+  TransformationController _controller = TransformationController();
+  Animation? _animationReset;
+  late AnimationController _controllerReset;
+
+  void reset() {
+    _controllerReset.reset();
+    _animationReset = Matrix4Tween(
+      begin: _controller.value,
+      end: Matrix4.identity(),
+    ).animate(_controllerReset);
+    _animationReset!.addListener(_onAnimateReset);
+    _controllerReset.forward();
+  }
+
+  void _onAnimateReset() {
+    _controller.value = _animationReset!.value;
+    if (!_controllerReset.isAnimating) {
+      _animationReset?.removeListener(_onAnimateReset);
+      _animationReset = null;
+      _controllerReset.reset();
+    }
+  }
+
+  @override
+  void initState() {
+    _controllerReset =
+        AnimationController(vsync: this, duration: Duration(milliseconds: 400));
+    super.initState();
+  }
+
+  @override
+  void dispose() {
+    _controllerReset.dispose();
+    _controller.dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      backgroundColor: Colors.black54,
-      body: GestureDetector(
+    return GestureDetector(
       onTap: () => Navigator.pop(context),
-        child: Center(
-          child: InteractiveViewer(
+      onDoubleTap: () => reset(),
+      child: Scaffold(
+        backgroundColor: Colors.black54,
+        body: InteractiveViewer(
+          transformationController: _controller,
           boundaryMargin: 100.edge,
+          child: Container(
+            width: double.infinity,
+            height: double.infinity,
+            alignment: Alignment.center,
             child: Hero(
               tag: widget.tag,
               child: widget.file != null