Desktop edge scrolling (#93170)

packages/flutter/lib/src/cupertino/text_field.dart

@@ -967,15 +967,30 @@ class _CupertinoTextFieldState extends State<CupertinoTextField> with Restoratio
   }
 
   void _handleSelectionChanged(TextSelection selection, SelectionChangedCause? cause) {
-    if (cause == SelectionChangedCause.longPress) {
-      _editableText.bringIntoView(selection.base);
-    }
     final bool willShowSelectionHandles = _shouldShowSelectionHandles(cause);
     if (willShowSelectionHandles != _showSelectionHandles) {
       setState(() {
         _showSelectionHandles = willShowSelectionHandles;
       });
     }
+
+    switch (defaultTargetPlatform) {
+      case TargetPlatform.iOS:
+      case TargetPlatform.macOS:
+        if (cause == SelectionChangedCause.longPress
+            || cause == SelectionChangedCause.drag) {
+          _editableText.bringIntoView(selection.extent);
+        }
+        return;
+      case TargetPlatform.linux:
+      case TargetPlatform.windows:
+      case TargetPlatform.fuchsia:
+      case TargetPlatform.android:
+        if (cause == SelectionChangedCause.drag) {
+          _editableText.bringIntoView(selection.extent);
+        }
+        return;
+    }
   }
 
   @override

packages/flutter/lib/src/gestures/monodrag.dart

@@ -614,7 +614,13 @@ class HorizontalDragGestureRecognizer extends DragGestureRecognizer {
 ///    some time has passed.
 class PanGestureRecognizer extends DragGestureRecognizer {
   /// Create a gesture recognizer for tracking movement on a plane.
-  PanGestureRecognizer({ Object? debugOwner }) : super(debugOwner: debugOwner);
+  PanGestureRecognizer({
+    Object? debugOwner,
+    Set<PointerDeviceKind>? supportedDevices,
+  }) : super(
+         debugOwner: debugOwner,
+         supportedDevices: supportedDevices,
+       );
 
   @override
   bool isFlingGesture(VelocityEstimate estimate, PointerDeviceKind kind) {

packages/flutter/lib/src/material/text_field.dart

@@ -1075,15 +1075,19 @@ class _TextFieldState extends State<TextField> with RestorationMixin implements
     switch (Theme.of(context).platform) {
       case TargetPlatform.iOS:
       case TargetPlatform.macOS:
-        if (cause == SelectionChangedCause.longPress) {
-          _editableText?.bringIntoView(selection.base);
+        if (cause == SelectionChangedCause.longPress
+            || cause == SelectionChangedCause.drag) {
+          _editableText?.bringIntoView(selection.extent);
         }
         return;
-      case TargetPlatform.android:
-      case TargetPlatform.fuchsia:
       case TargetPlatform.linux:
       case TargetPlatform.windows:
-        // Do nothing.
+      case TargetPlatform.fuchsia:
+      case TargetPlatform.android:
+        if (cause == SelectionChangedCause.drag) {
+          _editableText?.bringIntoView(selection.extent);
+        }
+        return;
     }
   }
 

packages/flutter/lib/src/widgets/text_selection.dart

@@ -1527,11 +1527,9 @@ class _TextSelectionGestureDetectorState extends State<TextSelectionGestureDetec
     if (widget.onDragSelectionStart != null ||
         widget.onDragSelectionUpdate != null ||
         widget.onDragSelectionEnd != null) {
-      // TODO(mdebbar): Support dragging in any direction (for multiline text).
-      // https://github.com/flutter/flutter/issues/28676
-      gestures[HorizontalDragGestureRecognizer] = GestureRecognizerFactoryWithHandlers<HorizontalDragGestureRecognizer>(
-        () => HorizontalDragGestureRecognizer(debugOwner: this, kind: PointerDeviceKind.mouse),
-        (HorizontalDragGestureRecognizer instance) {
+      gestures[PanGestureRecognizer] = GestureRecognizerFactoryWithHandlers<PanGestureRecognizer>(
+        () => PanGestureRecognizer(debugOwner: this, supportedDevices: <PointerDeviceKind>{ PointerDeviceKind.mouse }),
+        (PanGestureRecognizer instance) {
           instance
             // Text selection should start from the position of the first pointer
             // down event.

packages/flutter/test/cupertino/text_field_test.dart

@@ -2414,7 +2414,7 @@ void main() {
     expect(firstCharEndpoint.length, 1);
     // The first character is now offscreen to the left.
     expect(firstCharEndpoint[0].point.dx, moreOrLessEquals(-308.20, epsilon: 0.25));
-  });
+  }, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS,  TargetPlatform.macOS }));
 
   testWidgets(
     'long tap after a double tap select is not affected',