Text field scroll physics (#31088)

TextField and CupertinoTextField can now specify scrollPhysics. Cupertino defaults to bouncing now.

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

@@ -186,6 +186,7 @@ class CupertinoTextField extends StatefulWidget {
     this.keyboardAppearance,
     this.scrollPadding = const EdgeInsets.all(20.0),
     this.dragStartBehavior = DragStartBehavior.start,
+    this.scrollPhysics,
   }) : assert(textAlign != null),
        assert(autofocus != null),
        assert(obscureText != null),
@@ -425,6 +426,9 @@ class CupertinoTextField extends StatefulWidget {
   /// {@macro flutter.widgets.scrollable.dragStartBehavior}
   final DragStartBehavior dragStartBehavior;
 
+  /// {@macro flutter.widgets.edtiableText.scrollPhysics}
+  final ScrollPhysics scrollPhysics;
+
   @override
   _CupertinoTextFieldState createState() => _CupertinoTextFieldState();
 
@@ -452,6 +456,7 @@ class CupertinoTextField extends StatefulWidget {
     properties.add(IntProperty('maxLength', maxLength, defaultValue: null));
     properties.add(FlagProperty('maxLengthEnforced', value: maxLengthEnforced, ifTrue: 'max length enforced'));
     properties.add(DiagnosticsProperty<Color>('cursorColor', cursorColor, defaultValue: null));
+    properties.add(DiagnosticsProperty<ScrollPhysics>('scrollPhysics', scrollPhysics, defaultValue: null));
   }
 }
 
@@ -751,6 +756,7 @@ class _CupertinoTextFieldState extends State<CupertinoTextField> with AutomaticK
           scrollPadding: widget.scrollPadding,
           keyboardAppearance: keyboardAppearance,
           dragStartBehavior: widget.dragStartBehavior,
+          scrollPhysics: widget.scrollPhysics,
         ),
       ),
     );

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

@@ -165,6 +165,7 @@ class TextField extends StatefulWidget {
     this.enableInteractiveSelection,
     this.onTap,
     this.buildCounter,
+    this.scrollPhysics,
   }) : assert(textAlign != null),
        assert(autofocus != null),
        assert(obscureText != null),
@@ -459,6 +460,9 @@ class TextField extends StatefulWidget {
   /// {@end-tool}
   final InputCounterWidgetBuilder buildCounter;
 
+  /// {@macro flutter.widgets.edtiableText.scrollPhysics}
+  final ScrollPhysics scrollPhysics;
+
   @override
   _TextFieldState createState() => _TextFieldState();
 
@@ -489,6 +493,7 @@ class TextField extends StatefulWidget {
     properties.add(DiagnosticsProperty<Brightness>('keyboardAppearance', keyboardAppearance, defaultValue: null));
     properties.add(DiagnosticsProperty<EdgeInsetsGeometry>('scrollPadding', scrollPadding, defaultValue: const EdgeInsets.all(20.0)));
     properties.add(FlagProperty('selectionEnabled', value: selectionEnabled, defaultValue: true, ifFalse: 'selection disabled'));
+    properties.add(DiagnosticsProperty<ScrollPhysics>('scrollPhysics', scrollPhysics, defaultValue: null));
   }
 }
 
@@ -892,6 +897,7 @@ class _TextFieldState extends State<TextField> with AutomaticKeepAliveClientMixi
         keyboardAppearance: keyboardAppearance,
         enableInteractiveSelection: widget.enableInteractiveSelection,
         dragStartBehavior: widget.dragStartBehavior,
+        scrollPhysics: widget.scrollPhysics,
       ),
     );
 

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

@@ -301,6 +301,7 @@ class EditableText extends StatefulWidget {
     this.keyboardAppearance = Brightness.light,
     this.dragStartBehavior = DragStartBehavior.start,
     this.enableInteractiveSelection,
+    this.scrollPhysics,
   }) : assert(controller != null),
        assert(focusNode != null),
        assert(obscureText != null),
@@ -733,6 +734,15 @@ class EditableText extends StatefulWidget {
   /// {@macro flutter.widgets.scrollable.dragStartBehavior}
   final DragStartBehavior dragStartBehavior;
 
+  /// {@template flutter.widgets.editableText.scrollPhysics}
+  /// The [ScrollPhysics] to use when vertically scrolling the input.
+  ///
+  /// If not specified, it will behave according to the current platform.
+  ///
+  /// See [Scrollable.physics].
+  /// {@endtemplate}
+  final ScrollPhysics scrollPhysics;
+
   /// {@macro flutter.rendering.editable.selectionEnabled}
   bool get selectionEnabled {
     return enableInteractiveSelection ?? !obscureText;
@@ -758,6 +768,7 @@ class EditableText extends StatefulWidget {
     properties.add(DiagnosticsProperty<bool>('expands', expands, defaultValue: false));
     properties.add(DiagnosticsProperty<bool>('autofocus', autofocus, defaultValue: false));
     properties.add(DiagnosticsProperty<TextInputType>('keyboardType', keyboardType, defaultValue: null));
+    properties.add(DiagnosticsProperty<ScrollPhysics>('scrollPhysics', scrollPhysics, defaultValue: null));
   }
 }
 
@@ -1397,7 +1408,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
       excludeFromSemantics: true,
       axisDirection: _isMultiline ? AxisDirection.down : AxisDirection.right,
       controller: _scrollController,
-      physics: const ClampingScrollPhysics(),
+      physics: widget.scrollPhysics,
       dragStartBehavior: widget.dragStartBehavior,
       viewportBuilder: (BuildContext context, ViewportOffset offset) {
         return CompositedTransformTarget(

packages/flutter/test/material/text_field_test.dart

@@ -5348,6 +5348,7 @@ void main() {
       cursorColor: Color(0xff00ff00),
       keyboardAppearance: Brightness.dark,
       scrollPadding: EdgeInsets.zero,
+      scrollPhysics: ClampingScrollPhysics(),
       enableInteractiveSelection: false,
     ).debugFillProperties(builder);
 
@@ -5374,6 +5375,7 @@ void main() {
       'keyboardAppearance: Brightness.dark',
       'scrollPadding: EdgeInsets.zero',
       'selection disabled',
+      'scrollPhysics: ClampingScrollPhysics',
     ]);
   });