Added ScrollController to TextField (#32620)

scrollController param on TextField and CupertinoTextField

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

@@ -187,6 +187,7 @@ class CupertinoTextField extends StatefulWidget {
     this.scrollPadding = const EdgeInsets.all(20.0),
     this.dragStartBehavior = DragStartBehavior.start,
     this.enableInteractiveSelection,
+    this.scrollController,
     this.scrollPhysics,
   }) : assert(textAlign != null),
        assert(autofocus != null),
@@ -430,6 +431,9 @@ class CupertinoTextField extends StatefulWidget {
   /// {@macro flutter.widgets.scrollable.dragStartBehavior}
   final DragStartBehavior dragStartBehavior;
 
+  /// {@macro flutter.widgets.editableText.scrollController}
+  final ScrollController scrollController;
+
   /// {@macro flutter.widgets.edtiableText.scrollPhysics}
   final ScrollPhysics scrollPhysics;
 
@@ -444,7 +448,6 @@ class CupertinoTextField extends StatefulWidget {
   @override
   void debugFillProperties(DiagnosticPropertiesBuilder properties) {
     super.debugFillProperties(properties);
-
     properties.add(DiagnosticsProperty<TextEditingController>('controller', controller, defaultValue: null));
     properties.add(DiagnosticsProperty<FocusNode>('focusNode', focusNode, defaultValue: null));
     properties.add(DiagnosticsProperty<BoxDecoration>('decoration', decoration));
@@ -466,6 +469,7 @@ class CupertinoTextField extends StatefulWidget {
     properties.add(FlagProperty('maxLengthEnforced', value: maxLengthEnforced, ifTrue: 'max length enforced'));
     properties.add(DiagnosticsProperty<Color>('cursorColor', cursorColor, defaultValue: null));
     properties.add(FlagProperty('selectionEnabled', value: selectionEnabled, defaultValue: true, ifFalse: 'selection disabled'));
+    properties.add(DiagnosticsProperty<ScrollController>('scrollController', scrollController, defaultValue: null));
     properties.add(DiagnosticsProperty<ScrollPhysics>('scrollPhysics', scrollPhysics, defaultValue: null));
   }
 }
@@ -820,6 +824,7 @@ class _CupertinoTextFieldState extends State<CupertinoTextField> with AutomaticK
           scrollPadding: widget.scrollPadding,
           keyboardAppearance: keyboardAppearance,
           dragStartBehavior: widget.dragStartBehavior,
+          scrollController: widget.scrollController,
           scrollPhysics: widget.scrollPhysics,
           enableInteractiveSelection: widget.enableInteractiveSelection,
         ),

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

@@ -165,6 +165,7 @@ class TextField extends StatefulWidget {
     this.enableInteractiveSelection,
     this.onTap,
     this.buildCounter,
+    this.scrollController,
     this.scrollPhysics,
   }) : assert(textAlign != null),
        assert(autofocus != null),
@@ -463,6 +464,9 @@ class TextField extends StatefulWidget {
   /// {@macro flutter.widgets.edtiableText.scrollPhysics}
   final ScrollPhysics scrollPhysics;
 
+  /// {@macro flutter.widgets.editableText.scrollController}
+  final ScrollController scrollController;
+
   @override
   _TextFieldState createState() => _TextFieldState();
 
@@ -493,6 +497,7 @@ 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<ScrollController>('scrollController', scrollController, defaultValue: null));
     properties.add(DiagnosticsProperty<ScrollPhysics>('scrollPhysics', scrollPhysics, defaultValue: null));
   }
 }
@@ -957,6 +962,7 @@ class _TextFieldState extends State<TextField> with AutomaticKeepAliveClientMixi
         keyboardAppearance: keyboardAppearance,
         enableInteractiveSelection: widget.enableInteractiveSelection,
         dragStartBehavior: widget.dragStartBehavior,
+        scrollController: widget.scrollController,
         scrollPhysics: widget.scrollPhysics,
       ),
     );

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

@@ -302,6 +302,7 @@ class EditableText extends StatefulWidget {
     this.keyboardAppearance = Brightness.light,
     this.dragStartBehavior = DragStartBehavior.start,
     this.enableInteractiveSelection,
+    this.scrollController,
     this.scrollPhysics,
   }) : assert(controller != null),
        assert(focusNode != null),
@@ -738,6 +739,15 @@ class EditableText extends StatefulWidget {
   /// {@macro flutter.widgets.scrollable.dragStartBehavior}
   final DragStartBehavior dragStartBehavior;
 
+  /// {@template flutter.widgets.editableText.scrollController}
+  /// The [ScrollController] to use when vertically scrolling the input.
+  ///
+  /// If null, it will instantiate a new ScrollController.
+  ///
+  /// See [Scrollable.controller].
+  /// {@endtemplate}
+  final ScrollController scrollController;
+
   /// {@template flutter.widgets.editableText.scrollPhysics}
   /// The [ScrollPhysics] to use when vertically scrolling the input.
   ///
@@ -772,6 +782,7 @@ 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<ScrollController>('scrollController', scrollController, defaultValue: null));
     properties.add(DiagnosticsProperty<ScrollPhysics>('scrollPhysics', scrollPhysics, defaultValue: null));
   }
 }
@@ -786,7 +797,8 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
   TextInputConnection _textInputConnection;
   TextSelectionOverlay _selectionOverlay;
 
-  final ScrollController _scrollController = ScrollController();
+  ScrollController _scrollController;
+
   AnimationController _cursorBlinkOpacityController;
 
   final LayerLink _layerLink = LayerLink();
@@ -816,6 +828,7 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
     widget.controller.addListener(_didChangeTextEditingValue);
     _focusAttachment = widget.focusNode.attach(context);
     widget.focusNode.addListener(_handleFocusChanged);
+    _scrollController = widget.scrollController ?? ScrollController();
     _scrollController.addListener(() { _selectionOverlay?.updateForScroll(); });
     _cursorBlinkOpacityController = AnimationController(vsync: this, duration: _fadeDuration);
     _cursorBlinkOpacityController.addListener(_onCursorColorTick);