Merge branch 'siyaoH/1.17/material' of https://github.com/Unity-Technologies/com.unity.uiwidgets into siyaoH/1.17/material

com.unity.uiwidgets/Runtime/material/refresh_indicator.cs

 using System;
 using System.Collections.Generic;
-using uiwidgets;
 using Unity.UIWidgets.animation;
 using Unity.UIWidgets.async2;
 using Unity.UIWidgets.foundation;
             RefreshCallback onRefresh = null,
             Color color = null,
             Color backgroundColor = null,
-            ScrollNotificationPredicate notificationPredicate = null
+            ScrollNotificationPredicate notificationPredicate = null,
+            float strokenWidth = 2.0f
         ) : base(key: key) {
             D.assert(child != null);
             D.assert(onRefresh != null);
         public readonly Color backgroundColor;
 
         public readonly ScrollNotificationPredicate notificationPredicate;
+
+        public readonly float strokeWidth;
 
         public override State createState() {
             return new RefreshIndicatorState();
             return _pendingRefreshFuture;
         }
 
-        GlobalKey _key = GlobalKey.key();
-
-                key: _key,
                 onNotification: _handleScrollNotification,
                 child: new NotificationListener<OverscrollIndicatorNotification>(
                     onNotification: _handleGlowNotification,
-            if (_mode == null) {
-                D.assert(_dragOffset == null);
-                D.assert(_isIndicatorAtTop == null);
-                return child;
-            }
+            D.assert(() => {
+                if (_mode == null) {
+                    D.assert(_dragOffset == null);
+                    D.assert(_isIndicatorAtTop == null);
+                }
+                else {
+                    D.assert(_dragOffset != null);
+                    D.assert(_isIndicatorAtTop != null);
+                }
-            D.assert(_dragOffset != null);
-            D.assert(_isIndicatorAtTop != null);
+                return true;
+            });
-            return new Stack(
-                children: new List<Widget> {
-                    child,
-                    new Positioned(
-                        top: _isIndicatorAtTop == true ? 0.0f : (float?) null,
-                        bottom: _isIndicatorAtTop != true ? 0.0f : (float?) null,
-                        left: 0.0f,
-                        right: 0.0f,
-                        child: new SizeTransition(
-                            axisAlignment: _isIndicatorAtTop == true ? 1.0f : -1.0f,
-                            sizeFactor: _positionFactor, // this is what brings it down
-                            child: new Container(
-                                padding: _isIndicatorAtTop == true
-                                    ? EdgeInsets.only(top: widget.displacement)
-                                    : EdgeInsets.only(bottom: widget.displacement),
-                                alignment: _isIndicatorAtTop == true
-                                    ? Alignment.topCenter
-                                    : Alignment.bottomCenter,
-                                child: new ScaleTransition(
-                                    scale: _scaleFactor,
-                                    child: new AnimatedBuilder(
-                                        animation: _positionController,
-                                        builder: (BuildContext _context, Widget _child) => {
-                                            return new RefreshProgressIndicator(
-                                                value: showIndeterminateIndicator ? (float?) null : _value.value,
-                                                valueColor: _valueColor,
-                                                backgroundColor: widget.backgroundColor
-                                            );
-                                        }
-                                    )
+            List<Widget> children = new List<Widget> {child};
+            if (_mode != null) {
+                children.Add(new Positioned(
+                    top: _isIndicatorAtTop == true ? 0.0f : (float?) null,
+                    bottom: _isIndicatorAtTop != true ? 0.0f : (float?) null,
+                    left: 0.0f,
+                    right: 0.0f,
+                    child: new SizeTransition(
+                        axisAlignment: _isIndicatorAtTop == true ? 1.0f : -1.0f,
+                        sizeFactor: _positionFactor, // this is what brings it down
+                        child: new Container(
+                            padding: _isIndicatorAtTop == true
+                                ? EdgeInsets.only(top: widget.displacement)
+                                : EdgeInsets.only(bottom: widget.displacement),
+                            alignment: _isIndicatorAtTop == true
+                                ? Alignment.topCenter
+                                : Alignment.bottomCenter,
+                            child: new ScaleTransition(
+                                scale: _scaleFactor,
+                                child: new AnimatedBuilder(
+                                    animation: _positionController,
+                                    builder: (BuildContext _context, Widget _child) => {
+                                        return new RefreshProgressIndicator(
+                                            value: showIndeterminateIndicator ? (float?) null : _value.value,
+                                            valueColor: _valueColor,
+                                            backgroundColor: widget.backgroundColor,
+                                            strokeWidth: widget.strokeWidth
+                                        );
+                                    }
-                }
+                ));
+            }
+
+            return new Stack(
+                children: children
-}
+}

com.unity.uiwidgets/Runtime/material/reorderable_list.cs

 
     public class ReorderableListView : StatefulWidget {
         public ReorderableListView(
+            Key key = null,
+            ScrollController scrollController = null,
-        ) {
+        ) : base(key: key) {
             D.assert(onReorder != null);
             D.assert(children != null);
             D.assert(
             this.header = header;
             this.children = children;
+            this.scrollController = scrollController;
             this.scrollDirection = scrollDirection;
             this.padding = padding;
             this.onReorder = onReorder;
         public readonly List<Widget> children;
 
         public readonly Axis scrollDirection;
+        
+        public readonly ScrollController scrollController;
 
         public readonly EdgeInsets padding;
 
                     return new _ReorderableListContent(
                         header: widget.header,
                         children: widget.children,
+                        scrollController: widget.scrollController,
                         scrollDirection: widget.scrollDirection,
                         onReorder: widget.onReorder,
                         padding: widget.padding,
         public _ReorderableListContent(
             Widget header,
             List<Widget> children,
+            ScrollController scrollController,
             Axis scrollDirection,
             EdgeInsets padding,
             ReorderCallback onReorder,
             this.children = children;
+            this.scrollController = scrollController;
             this.scrollDirection = scrollDirection;
             this.padding = padding;
             this.onReorder = onReorder;
         public readonly Widget header;
         public readonly List<Widget> children;
+        public readonly ScrollController scrollController;
         public readonly Axis scrollDirection;
         public readonly EdgeInsets padding;
         public readonly ReorderCallback onReorder;
         }
 
         public override void didChangeDependencies() {
-            _scrollController = PrimaryScrollController.of(context) ?? new ScrollController();
+            _scrollController = widget.scrollController ?? PrimaryScrollController.of(context) ?? new ScrollController();
             base.didChangeDependencies();
         }
 
             D.assert(material_.debugCheckHasMaterialLocalizations(context));
             return new LayoutBuilder(builder: (BuildContext _, BoxConstraints constraints) => {
                 List<Widget> wrappedChildren = new List<Widget> { };
-                if (widget.header != null) {
-                    wrappedChildren.Add(widget.header);
-                }
-
-                for (int i = 0; i < widget.children.Count; i += 1) {
-                    wrappedChildren.Add(_wrap(widget.children[i], i, constraints));
-                }
-
+                
                 Key endWidgetKey = Key.key("DraggableList - End Widget");
                 Widget finalDropArea;
                 switch (widget.scrollDirection) {
                 }
 
                 if (widget.reverse == true) {
-                    wrappedChildren.Insert(0, _wrap(
+                    wrappedChildren.Add(_wrap(
-                else {
+                if (widget.header != null) {
+                    wrappedChildren.Add(widget.header);
+                }
+                for (int i = 0; i < widget.children.Count; i += 1) {
+                    wrappedChildren.Add(_wrap(widget.children[i], i, constraints));
+                }
+
+                
+                if (widget.reverse != true) {
                     wrappedChildren.Add(_wrap(
                         finalDropArea, widget.children.Count,
                         constraints)

com.unity.uiwidgets/Runtime/material/scrollbar.cs

 using System;
 using Unity.UIWidgets.animation;
-using Unity.UIWidgets.async;
+using Unity.UIWidgets.cupertino;
+using UnityEngine;
+using Color = Unity.UIWidgets.ui.Color;
 
 namespace Unity.UIWidgets.material {
     static class ScrollbarUtils {
     public class Scrollbar : StatefulWidget {
         public Scrollbar(
             Key key = null,
-            Widget child = null) : base(key: key) {
+            Widget child = null,
+            ScrollController controller = null,
+            bool isAlwaysShown = false) : base(key: key) {
+            this.controller = controller;
+            this.isAlwaysShown = isAlwaysShown;
+
+        public readonly ScrollController controller;
+
+        public readonly bool isAlwaysShown;
 
         public override State createState() {
             return new _ScrollbarState();
         public TextDirection _textDirection;
         public Color _themeColor;
 
+        bool? _useCupertinoScrollbar = null;
+
-        public Animation<float> _FadeoutOpacityAnimation;
+        public Animation<float> _fadeoutOpacityAnimation;
         public Timer _fadeoutTimer;
 
         public override void initState() {
                 duration: ScrollbarUtils._kScrollbarFadeDuration
             );
-            _FadeoutOpacityAnimation = new CurvedAnimation(
+            _fadeoutOpacityAnimation = new CurvedAnimation(
                 parent: _fadeoutAnimationController,
                 curve: Curves.fastOutSlowIn
             );
             base.didChangeDependencies();
 
+            D.assert((() => {
+                _useCupertinoScrollbar = null;
+                return true;
+            }));
+
-            _themeColor = theme.highlightColor.withOpacity(1.0f);
-            _textDirection = Directionality.of(context);
-            _materialPainter = _BuildMaterialScrollbarPainter();
+            switch (theme.platform) {
+                case RuntimePlatform.IPhonePlayer:
+                case RuntimePlatform.OSXPlayer:
+                case RuntimePlatform.OSXEditor:
+                    _fadeoutTimer?.cancel();
+                    _fadeoutTimer = null;
+                    _fadeoutAnimationController.reset();
+                    _useCupertinoScrollbar = true;
+                    break;
+                default:
+                    _themeColor = theme.highlightColor.withOpacity(1.0f);
+                    _textDirection = Directionality.of(context);
+                    _materialPainter = _buildMaterialScrollbarPainter();
+                    _useCupertinoScrollbar = false;
+                    WidgetsBinding.instance.addPostFrameCallback((TimeSpan duration) => {
+                        if (widget.isAlwaysShown) {
+                            D.assert(widget.controller != null);
+                            widget.controller.position.didUpdateScrollPositionBy(0);
+                        }
+                    });
+                    break;
+            }
+
+            D.assert(_useCupertinoScrollbar != null);
-        public ScrollbarPainter _BuildMaterialScrollbarPainter() {
+        public override void didUpdateWidget(StatefulWidget oldWidget) {
+            var _oldWidget = (Scrollbar) oldWidget;
+            base.didUpdateWidget(oldWidget);
+            if (widget.isAlwaysShown != _oldWidget.isAlwaysShown) {
+                D.assert(widget.controller != null);
+                if (widget.isAlwaysShown == false) {
+                    _fadeoutAnimationController.reverse();
+                }
+                else {
+                    _fadeoutAnimationController.animateTo(1.0f);
+                }
+            }
+        }
+
+        public ScrollbarPainter _buildMaterialScrollbarPainter() {
-                textDirection: _textDirection,
-                thickness: ScrollbarUtils._kScrollbarThickness,
-                fadeoutOpacityAnimation: _FadeoutOpacityAnimation
+                      textDirection: _textDirection,
+                  thickness: ScrollbarUtils._kScrollbarThickness,
+                 fadeoutOpacityAnimation: _fadeoutOpacityAnimation,
+                  padding: MediaQuery.of(context).padding
-            if (notification is ScrollUpdateNotification || notification is OverscrollNotification) {
+            ScrollMetrics metrics = notification.metrics;
+            if (metrics.maxScrollExtent <= metrics.minScrollExtent) {
+                return false;
+            }
+            if (!_useCupertinoScrollbar.Value &&
+                (notification is ScrollUpdateNotification ||
+                 notification is OverscrollNotification)) {
-                _materialPainter.update(notification.metrics, notification.metrics.axisDirection);
-                _fadeoutTimer?.cancel();
-
-                _fadeoutTimer = Timer.create(ScrollbarUtils._kScrollbarTimeToFade, () => {
-                    _fadeoutAnimationController.reverse();
-                    _fadeoutTimer = null;
-                });
+                _materialPainter.update(
+                    notification.metrics,
+                    notification.metrics.axisDirection
+                );
+                if (!widget.isAlwaysShown) {
+                    _fadeoutTimer?.cancel();
+                    _fadeoutTimer = Timer.create(ScrollbarUtils._kScrollbarTimeToFade, () => {
+                        _fadeoutAnimationController.reverse();
+                        _fadeoutTimer = null;
+                    });
+                }
-
             return false;
         }
 
         }
 
         public override Widget build(BuildContext context) {
+            //TODO：uncomment here when cupertino updates are merged
+            /*if (_useCupertinoScrollbar.Value) {
+                return new CupertinoScrollbar(
+                    child: widget.child,
+                    isAlwaysShown: widget.isAlwaysShown,
+                    controller: widget.controller
+                );
+            }*/
             return new NotificationListener<ScrollNotification>(
                 onNotification: _handleScrollNotification,
                 child: new RepaintBoundary(

com.unity.uiwidgets/Runtime/material/search.cs

     }
 
     public abstract class SearchDelegate<T> {
+        public SearchDelegate(
+            string searchFieldLabel = null,
+            TextInputType keyboardType = null,
+            TextInputAction textInputAction = TextInputAction.search
+        ) {
+            this.searchFieldLabel = searchFieldLabel;
+            this.keyboardType = keyboardType;
+            this.textInputAction = textInputAction;
+        }
         public abstract Widget buildSuggestions(BuildContext context);
         public abstract Widget buildResults(BuildContext context);
         public abstract Widget buildLeading(BuildContext context);
         }
 
         public virtual void showResults(BuildContext context) {
-            _focusNode.unfocus();
+            _focusNode?.unfocus();
-            FocusScope.of(context).requestFocus(_focusNode);
+            D.assert(_focusNode != null, () => "_focusNode must be set by route before showSuggestions is called.");
+            _focusNode.requestFocus();
-            _focusNode.unfocus();
+            _focusNode?.unfocus();
+        public readonly string searchFieldLabel;
+        public readonly TextInputType keyboardType;
+
+        public readonly TextInputAction textInputAction;
+        
-        readonly internal FocusNode _focusNode = new FocusNode();
+        internal FocusNode _focusNode;
 
         readonly internal TextEditingController _queryTextController = new TextEditingController();
 
         public override Color barrierColor {
             get { return null; }
         }
+
+        public override string barrierLabel => null;
 
         public override TimeSpan transitionDuration {
             get { return new TimeSpan(0, 0, 0, 0, 300); }
     }
 
     class _SearchPageState<T> : State<_SearchPage<T>> {
+        
+        FocusNode focusNode = new FocusNode();
-            queryTextController.addListener(_onQueryChanged);
+            widget.del._queryTextController.addListener(_onQueryChanged);
-            widget.del._focusNode.addListener(_onFocusChanged);
+            focusNode.addListener(_onFocusChanged);
+            widget.del._focusNode = focusNode;
-            queryTextController.removeListener(_onQueryChanged);
+            widget.del._queryTextController.removeListener(_onQueryChanged);
-            widget.del._focusNode.removeListener(_onFocusChanged);
+            widget.del._focusNode = null;
+            focusNode.dispose();
         }
 
         void _onAnimationStatusChanged(AnimationStatus status) {
 
             widget.animation.removeStatusListener(_onAnimationStatusChanged);
             if (widget.del._currentBody == _SearchBody.suggestions) {
-                FocusScope.of(context).requestFocus(widget.del._focusNode);
+                focusNode.requestFocus();
+            }
+        }
+
+        public override void didUpdateWidget(StatefulWidget oldWidget) {
+            var _oldWidget = (_SearchPage<T>) oldWidget;
+            base.didUpdateWidget(oldWidget);
+            if (widget.del != _oldWidget.del) {
+                _oldWidget.del._queryTextController.removeListener(_onQueryChanged);
+                widget.del._queryTextController.addListener(_onQueryChanged);
+                _oldWidget.del._currentBodyNotifier.removeListener(_onSearchBodyChanged);
+                widget.del._currentBodyNotifier.addListener(_onSearchBodyChanged);
+                _oldWidget.del._focusNode = null;
+                widget.del._focusNode = focusNode;
-            if (widget.del._focusNode.hasFocus && widget.del._currentBody != _SearchBody.suggestions) {
+            if (focusNode.hasFocus && widget.del._currentBody != _SearchBody.suggestions) {
                 widget.del.showSuggestions(context);
             }
         }
             material_.debugCheckHasMaterialLocalizations(context);
 
             ThemeData theme = widget.del.appBarTheme(context);
-            string searchFieldLabel = MaterialLocalizations.of(context).searchFieldLabel;
+            string searchFieldLabel = widget.del.searchFieldLabel ?? MaterialLocalizations.of(context).searchFieldLabel;
             Widget body = null;
             switch (widget.del._currentBody) {
                 case _SearchBody.suggestions:
             string routeName;
             switch (Theme.of(this.context).platform) {
                 case RuntimePlatform.IPhonePlayer:
+                case RuntimePlatform.OSXEditor:
+                case RuntimePlatform.OSXPlayer:
                     routeName = "";
                     break;
                 case RuntimePlatform.Android:
                     brightness: theme.primaryColorBrightness,
                     leading: widget.del.buildLeading(context),
                     title: new TextField(
-                        controller: queryTextController,
-                        focusNode: widget.del._focusNode,
-                        style: theme.textTheme.title,
-                        textInputAction: TextInputAction.search,
+                        controller: widget.del._queryTextController,
+                        focusNode: focusNode,
+                        style: theme.textTheme.headline6,
+                        textInputAction: widget.del.textInputAction,
+                        keyboardType: widget.del.keyboardType,
-                            hintText: searchFieldLabel
+                            hintText: searchFieldLabel,
+                            hintStyle: theme.inputDecorationTheme.hintStyle
                         )
                     ),
                     actions: widget.del.buildActions(context)

com.unity.uiwidgets/Runtime/material/slider_theme.cs

         }
     }
     
-    public delegate Thumb RangeThumbSelector(TextDirection textDirection,
+    public delegate Thumb? RangeThumbSelector(TextDirection textDirection,
-    double tapValue,
+    float tapValue,
     Size thumbSize,
     Size trackSize,
     float dx

com.unity.uiwidgets/Runtime/widgets/editable_text.cs

     
     public class EditableText : StatefulWidget {
         public EditableText(
-            SmartDashesType smartDashesType,
-            SmartQuotesType smartQuotesType,
             Key key = null,
             TextEditingController controller = null,
             FocusNode focusNode = null,
+            SmartDashesType? smartDashesType = null,
+            SmartQuotesType? smartQuotesType = null,
             bool enableSuggestions = true,
             TextStyle style = null,
             StrutStyle strutStyle = null,
         ) : base(key) {
             D.assert(controller != null);
             D.assert(focusNode != null);
-            smartDashesType = (obscureText ? SmartDashesType.disabled : SmartDashesType.enabled);
-            smartQuotesType = (obscureText ? SmartQuotesType.disabled : SmartQuotesType.enabled);
+            smartDashesType = smartDashesType ?? (obscureText ? SmartDashesType.disabled : SmartDashesType.enabled);
+            smartQuotesType = smartQuotesType ?? (obscureText ? SmartQuotesType.disabled : SmartQuotesType.enabled);
             D.assert(enableInteractiveSelection != null);
             D.assert(style != null);
             D.assert(cursorColor != null);
             this.obscureText = obscureText;
             this.autocorrect = autocorrect;
             this.style = style;
-            this.smartDashesType = smartDashesType;
-            this.smartQuotesType = smartQuotesType;
+            this.smartDashesType = smartDashesType.Value;
+            this.smartQuotesType = smartQuotesType.Value;
             this.showCursor = showCursor;
             this.textWidthBasis = textWidthBasis;
             this.onSelectionHandleTapped = onSelectionHandleTapped;
                         inputType: widget.keyboardType,
                         obscureText: widget.obscureText,
                         autocorrect: widget.autocorrect,
-                        smartDashesType: widget.obscureText ? SmartDashesType.disabled : SmartDashesType.enabled,
-                        smartQuotesType: widget.obscureText ? SmartQuotesType.disabled : SmartQuotesType.enabled,
+                        smartDashesType: widget.smartDashesType,
+                        smartQuotesType: widget.smartQuotesType,
                         enableSuggestions: widget.enableSuggestions,
                         inputAction: widget.textInputAction ?? (widget.keyboardType == TextInputType.multiline
                             ? TextInputAction.newline
             Locale locale = null,
             bool obscureText = false,
             bool autocorrect = false,
-            SmartDashesType smartDashesType = SmartDashesType.disabled,
-            SmartQuotesType smartQuotesType = SmartQuotesType.disabled,
+            SmartDashesType? smartDashesType = null,
+            SmartQuotesType? smartQuotesType = null,
             bool? enableSuggestions = null,
             ViewportOffset offset = null,
             SelectionChangedHandler onSelectionChanged = null,
             this.textDirection = textDirection;
             this.obscureText = obscureText;
             this.autocorrect = autocorrect;
-            this.smartDashesType = smartDashesType;
-            this.smartQuotesType = smartQuotesType;
+            this.smartDashesType = smartDashesType.Value;
+            this.smartQuotesType = smartQuotesType.Value;
             this.enableSuggestions = enableSuggestions;
             this.offset = offset;
             this.onSelectionChanged = onSelectionChanged;

com.unity.uiwidgets/Runtime/material/selectable_text.cs

+using System;
+using System.Collections.Generic;
+using Unity.UIWidgets.animation;
+using Unity.UIWidgets.async2;
+using Unity.UIWidgets.cupertino;
+using Unity.UIWidgets.foundation;
+using Unity.UIWidgets.gestures;
+using Unity.UIWidgets.painting;
+using Unity.UIWidgets.rendering;
+using Unity.UIWidgets.service;
+using Unity.UIWidgets.ui;
+using Unity.UIWidgets.widgets;
+using UnityEngine;
+using Color = Unity.UIWidgets.ui.Color;
+using StrutStyle = Unity.UIWidgets.painting.StrutStyle;
+using TextStyle = Unity.UIWidgets.painting.TextStyle;
+
+namespace Unity.UIWidgets.material {
+
+    public static class SelectableTextUtils {
+        internal const int iOSHorizontalOffset = -2;
+    }
+
+    class _TextSpanEditingController : TextEditingController {
+        public _TextSpanEditingController(TextSpan textSpan = null) : base(text: textSpan?.toPlainText()) {
+            D.assert(textSpan != null);
+            _textSpan = textSpan;
+        }
+        
+        public readonly TextSpan _textSpan;
+
+        public override TextSpan buildTextSpan(TextStyle style = null ,bool withComposing = false) {
+            return new TextSpan(
+                style: style,
+                children: new List<InlineSpan> {_textSpan}
+            );
+        }
+        
+        public new string text {
+            get { return value.text; }
+            set {
+                
+            }
+        }
+    }
+
+    class _SelectableTextSelectionGestureDetectorBuilder : TextSelectionGestureDetectorBuilder {
+        public _SelectableTextSelectionGestureDetectorBuilder(
+            _SelectableTextState state
+        ) : base(_delegate: state) {
+            _state = state;
+        }
+        
+        public readonly _SelectableTextState _state;
+
+        protected override void onForcePressStart(ForcePressDetails details) {
+            base.onForcePressStart(details);
+            if (_delegate.selectionEnabled && shouldShowSelectionToolbar) {
+                editableText.showToolbar();
+            }
+        }
+
+        protected override void onForcePressEnd(ForcePressDetails details) {
+            // Not required.
+        }
+
+        protected override void onSingleLongTapMoveUpdate(LongPressMoveUpdateDetails details) {
+            if (_delegate.selectionEnabled) {
+                switch (Theme.of(_state.context).platform) {
+                    case RuntimePlatform.IPhonePlayer: 
+                    case RuntimePlatform.OSXEditor:
+                    case RuntimePlatform.OSXPlayer:
+                        renderEditable.selectPositionAt(
+                            from: details.globalPosition,
+                            cause: SelectionChangedCause.longPress
+                        );
+                        break;
+                    default:
+                        renderEditable.selectWordsInRange(
+                            from: details.globalPosition - details.offsetFromOrigin,
+                            to: details.globalPosition,
+                            cause: SelectionChangedCause.longPress
+                        );
+                        break;
+                }
+            }
+        }
+
+        protected override void onSingleTapUp(TapUpDetails details) {
+            editableText.hideToolbar();
+            if (_delegate.selectionEnabled) {
+                switch (Theme.of(_state.context).platform) {
+                    case RuntimePlatform.IPhonePlayer: 
+                    case RuntimePlatform.OSXEditor:
+                    case RuntimePlatform.OSXPlayer:
+                        renderEditable.selectWordEdge(cause: SelectionChangedCause.tap);
+                        break;
+                    default:
+                        renderEditable.selectPosition(cause: SelectionChangedCause.tap);
+                        break;
+                }
+            }
+            if (_state.widget.onTap != null)
+                _state.widget.onTap();
+        }
+
+        protected override void onSingleLongTapStart(LongPressStartDetails details) {
+            if (_delegate.selectionEnabled) {
+                switch (Theme.of(_state.context).platform) {
+                    case RuntimePlatform.IPhonePlayer: 
+                    case RuntimePlatform.OSXEditor:
+                    case RuntimePlatform.OSXPlayer:
+                        renderEditable.selectPositionAt(
+                            from: details.globalPosition,
+                            cause: SelectionChangedCause.longPress
+                        );
+                        break;
+                    default:
+                        renderEditable.selectWord(cause: SelectionChangedCause.longPress);
+                        Feedback.forLongPress(_state.context);
+                        break;
+                }
+            }
+        }
+    }
+
+    class SelectableText : StatefulWidget {
+
+        public SelectableText(
+            string data,
+            Key key = null,
+            FocusNode focusNode = null,
+            TextStyle style = null,
+            StrutStyle strutStyle = null,
+            TextAlign? textAlign = null,
+            TextDirection? textDirection = null,
+            float? textScaleFactor = null,
+            bool showCursor = false,
+            bool autofocus = false,
+            ToolbarOptions toolbarOptions = null,
+            int? minLines = null,
+            int? maxLines = null,
+            float cursorWidth = 2.0f,
+            Radius cursorRadius = null,
+            Color cursorColor = null,
+            DragStartBehavior dragStartBehavior = DragStartBehavior.start,
+            bool enableInteractiveSelection = true,
+            GestureTapCallback onTap = null,
+            ScrollPhysics scrollPhysics = null,
+            TextWidthBasis? textWidthBasis = null
+            ) : this(
+            data: data,
+            textSpan: null,
+            key: key,
+            focusNode: focusNode,
+            style: style,
+            strutStyle: strutStyle,
+            textAlign: textAlign,
+            textDirection: textDirection,
+            textScaleFactor: textScaleFactor,
+            showCursor: showCursor,
+            autofocus: autofocus,
+            toolbarOptions: toolbarOptions,
+            minLines: minLines,
+            maxLines: maxLines,
+            cursorWidth: cursorWidth,
+            cursorRadius: cursorRadius,
+            cursorColor: cursorColor,
+            dragStartBehavior: dragStartBehavior,
+            enableInteractiveSelection: enableInteractiveSelection,
+            onTap: onTap,
+            scrollPhysics: scrollPhysics,
+            textWidthBasis: textWidthBasis
+            ) {
+            D.assert(
+                data != null,
+                () => "A non-null String must be provided to a SelectableText widget."
+            );
+        }
+        
+        SelectableText(
+            string data,
+            TextSpan textSpan,
+            Key key = null,
+            FocusNode focusNode = null,
+            TextStyle style = null,
+            StrutStyle strutStyle = null,
+            TextAlign? textAlign = null,
+            TextDirection? textDirection = null,
+            float? textScaleFactor = null,
+            bool showCursor = false,
+            bool autofocus = false,
+            ToolbarOptions toolbarOptions = null,
+            int? minLines = null,
+            int? maxLines = null,
+            float cursorWidth = 2.0f,
+            Radius cursorRadius = null,
+            Color cursorColor = null,
+            DragStartBehavior dragStartBehavior = DragStartBehavior.start,
+            bool enableInteractiveSelection = true,
+            GestureTapCallback onTap = null,
+            ScrollPhysics scrollPhysics = null,
+            TextWidthBasis? textWidthBasis = null
+            ) : base(key: key) {
+            D.assert(maxLines == null || maxLines > 0);
+            D.assert(minLines == null || minLines > 0);
+            D.assert(
+                (maxLines == null) || (minLines == null) || (maxLines >= minLines),
+                () => "minLines can\'t be greater than maxLines"
+            );
+            toolbarOptions = toolbarOptions ??
+                             new ToolbarOptions(
+                                 selectAll: true,
+                                 copy: true
+                             );
+            
+            this.data = data;
+            this.textSpan = textSpan;
+            this.focusNode = focusNode;
+            this.style = style;
+            this.strutStyle = strutStyle;
+            this.textAlign = textAlign;
+            this.textDirection = textDirection;
+            this.textScaleFactor = textScaleFactor;
+            this.showCursor = showCursor;
+            this.autofocus = autofocus;
+            this.toolbarOptions = toolbarOptions;
+            this.minLines = minLines;
+            this.maxLines = maxLines;
+            this.cursorWidth = cursorWidth;
+            this.cursorRadius = cursorRadius;
+            this.cursorColor = cursorColor;
+            this.dragStartBehavior = dragStartBehavior;
+            this.enableInteractiveSelection = enableInteractiveSelection;
+            this.onTap = onTap;
+            this.scrollPhysics = scrollPhysics;
+            this.textWidthBasis = textWidthBasis;
+        }
+
+        public static SelectableText rich(
+            TextSpan textSpan,
+            Key key = null,
+            FocusNode focusNode = null,
+            TextStyle style = null,
+            StrutStyle strutStyle = null,
+            TextAlign? textAlign = null,
+            TextDirection? textDirection = null,
+            float? textScaleFactor = null,
+            bool showCursor = false,
+            bool autofocus = false,
+            ToolbarOptions toolbarOptions = null,
+            int? minLines = null,
+            int? maxLines = null,
+            float cursorWidth = 2.0f,
+            Radius cursorRadius = null,
+            Color cursorColor = null,
+            DragStartBehavior dragStartBehavior = DragStartBehavior.start,
+            bool enableInteractiveSelection = true,
+            GestureTapCallback onTap = null,
+            ScrollPhysics scrollPhysics = null,
+            TextWidthBasis? textWidthBasis = null
+        ) {
+            D.assert(
+                textSpan != null,
+                () => "A non-null TextSpan must be provided to a SelectableText.rich widget."
+            );
+            
+            return new SelectableText(
+                data: null,
+                textSpan: textSpan,
+                key: key,
+                focusNode: focusNode,
+                style: style,
+                strutStyle: strutStyle,
+                textAlign: textAlign,
+                textDirection: textDirection,
+                textScaleFactor: textScaleFactor,
+                showCursor: showCursor,
+                autofocus: autofocus,
+                toolbarOptions: toolbarOptions,
+                minLines: minLines,
+                maxLines: maxLines,
+                cursorWidth: cursorWidth,
+                cursorRadius: cursorRadius,
+                cursorColor: cursorColor,
+                dragStartBehavior: dragStartBehavior,
+                enableInteractiveSelection: enableInteractiveSelection,
+                onTap: onTap,
+                scrollPhysics: scrollPhysics,
+                textWidthBasis: textWidthBasis
+                );
+        }
+  
+  public readonly string data; 
+
+  public readonly TextSpan textSpan;
+
+  public readonly FocusNode focusNode;
+
+  public readonly TextStyle style;
+
+  public readonly StrutStyle strutStyle;
+
+  public readonly TextAlign? textAlign;
+
+  public readonly TextDirection? textDirection;
+
+  public readonly float? textScaleFactor;
+
+  
+  public readonly bool autofocus;
+
+  
+  public readonly int? minLines;
+
+  
+  public readonly int? maxLines;
+
+  
+  public readonly bool showCursor;
+
+  
+  public readonly float cursorWidth;
+
+  
+  public readonly Radius cursorRadius;
+
+  public readonly Color cursorColor;
+
+  
+  public readonly bool enableInteractiveSelection;
+
+  
+  public readonly DragStartBehavior dragStartBehavior;
+
+  public readonly ToolbarOptions toolbarOptions;
+
+
+  internal bool  selectionEnabled {
+      get { return enableInteractiveSelection; }
+  }
+
+  public readonly GestureTapCallback onTap;
+
+  
+  public readonly ScrollPhysics scrollPhysics;
+
+  
+  public readonly TextWidthBasis? textWidthBasis;
+
+  public override State createState() => new _SelectableTextState();
+
+  public override void debugFillProperties(DiagnosticPropertiesBuilder properties) {
+      base.debugFillProperties(properties);
+      properties.add( new DiagnosticsProperty<String>("data", data, defaultValue: null));
+      properties.add( new DiagnosticsProperty<FocusNode>("focusNode", focusNode, defaultValue: null));
+      properties.add( new DiagnosticsProperty<TextStyle>("style", style, defaultValue: null));
+      properties.add( new DiagnosticsProperty<bool>("autofocus", autofocus, defaultValue: false));
+      properties.add( new DiagnosticsProperty<bool>("showCursor", showCursor, defaultValue: false));
+      properties.add( new IntProperty("minLines", minLines, defaultValue: null));
+      properties.add( new IntProperty("maxLines", maxLines, defaultValue: null));
+      properties.add( new EnumProperty<TextAlign?>("textAlign", textAlign, defaultValue: null));
+      properties.add( new EnumProperty<TextDirection?>("textDirection", textDirection, defaultValue: null));
+      properties.add( new FloatProperty("textScaleFactor", textScaleFactor, defaultValue: null));
+      properties.add( new FloatProperty("cursorWidth", cursorWidth, defaultValue: 2.0f));
+      properties.add( new DiagnosticsProperty<Radius>("cursorRadius", cursorRadius, defaultValue: null));
+      properties.add( new DiagnosticsProperty<Color>("cursorColor", cursorColor, defaultValue: null));
+      properties.add( new FlagProperty("selectionEnabled", value: selectionEnabled, defaultValue: true, ifFalse: "selection disabled"));
+      properties.add( new DiagnosticsProperty<ScrollPhysics>("scrollPhysics", scrollPhysics, defaultValue: null));
+  }
+    }
+
+    class _SelectableTextState : AutomaticKeepAliveClientMixin<SelectableText>,
+        TextSelectionGestureDetectorBuilderDelegate {
+        
+        EditableTextState _editableText => editableTextKey.currentState;
+        
+        _TextSpanEditingController _controller;
+
+        FocusNode _focusNode;
+        FocusNode _effectiveFocusNode => widget.focusNode ?? (_focusNode = _focusNode ?? new FocusNode());
+
+        bool _showSelectionHandles = false;
+
+        _SelectableTextSelectionGestureDetectorBuilder _selectionGestureDetectorBuilder;
+
+        public bool forcePressEnabled {
+            get { return _forcePressEnabled; }
+            set { _forcePressEnabled = value; }
+        }
+        
+        bool _forcePressEnabled;
+
+        public GlobalKey<EditableTextState> editableTextKey {
+            get { return _editableTextKey; }
+        }
+
+        readonly GlobalKey<EditableTextState> _editableTextKey = GlobalKey<EditableTextState>.key();
+
+        public bool selectionEnabled => widget.selectionEnabled;
+
+        public override void initState() {
+            base.initState();
+            _selectionGestureDetectorBuilder = new _SelectableTextSelectionGestureDetectorBuilder(state: this);
+            _controller = new _TextSpanEditingController(
+                textSpan: widget.textSpan ?? new TextSpan(text: widget.data)
+            );
+        }
+
+        public override void didUpdateWidget(StatefulWidget oldWidget) {
+            var _oldWidget = (SelectableText) oldWidget;
+            base.didUpdateWidget(oldWidget);
+            if (widget.data != _oldWidget.data || widget.textSpan != _oldWidget.textSpan) {
+                _controller = new _TextSpanEditingController(
+                    textSpan: widget.textSpan ?? new TextSpan(text: widget.data)
+                );
+            }
+            if (_effectiveFocusNode.hasFocus && _controller.selection.isCollapsed) {
+                _showSelectionHandles = false;
+            }
+        }
+
+        public override void dispose() {
+            _focusNode?.dispose();
+            base.dispose();
+        }
+        
+        void _handleSelectionChanged(TextSelection selection, SelectionChangedCause cause) {
+            bool willShowSelectionHandles = _shouldShowSelectionHandles(cause);
+            if (willShowSelectionHandles != _showSelectionHandles) {
+                setState(() => {
+                    _showSelectionHandles = willShowSelectionHandles;
+                });
+            }
+
+            switch (Theme.of(context).platform) {
+                case RuntimePlatform.IPhonePlayer:
+                case RuntimePlatform.OSXEditor:
+                case RuntimePlatform.OSXPlayer:
+                    if (cause == SelectionChangedCause.longPress) {
+                        _editableText?.bringIntoView(selection.basePos);
+                    }
+                    return;
+                default:
+                // Do nothing.
+                break;
+            }
+        }
+        
+        void _handleSelectionHandleTapped() {
+            if (_controller.selection.isCollapsed) {
+                _editableText.toggleToolbar();
+            }
+        }
+        
+        bool _shouldShowSelectionHandles(SelectionChangedCause cause) {
+            if (!_selectionGestureDetectorBuilder.shouldShowSelectionToolbar)
+                return false;
+
+            if (_controller.selection.isCollapsed)
+                return false;
+
+            if (cause == SelectionChangedCause.keyboard)
+                return false;
+
+            if (cause == SelectionChangedCause.longPress)
+                return true;
+
+            if (_controller.text.isNotEmpty())
+                return true;
+
+            return false;
+        }
+
+        protected override bool wantKeepAlive => true;
+        
+        Widget build(BuildContext context) {
+    base.build(context);
+    D.assert(() => {
+      return _controller._textSpan.visitChildren((InlineSpan span) => span is TextSpan);
+    }, () => "SelectableText only supports TextSpan; Other type of InlineSpan is not allowed");
+    D.assert(WidgetsD.debugCheckHasMediaQuery(context));
+    D.assert(WidgetsD.debugCheckHasDirectionality(context));
+    D.assert(
+      !(widget.style != null && widget.style.inherit == false &&
+          (widget.style.fontSize == null || widget.style.textBaseline == null)),
+      () => "inherit false style must supply fontSize and textBaseline"
+    );
+
+     ThemeData themeData = Theme.of(context);
+     FocusNode focusNode = _effectiveFocusNode;
+
+    TextSelectionControls textSelectionControls;
+    bool paintCursorAboveText;
+    bool cursorOpacityAnimates;
+    Offset cursorOffset = Offset.zero;
+    Color cursorColor = widget.cursorColor;
+    Radius cursorRadius = widget.cursorRadius;
+
+    switch (themeData.platform) {
+        case RuntimePlatform.IPhonePlayer:
+        case RuntimePlatform.OSXEditor:
+        case RuntimePlatform.OSXPlayer:
+            forcePressEnabled = true;
+            textSelectionControls = CupertinoTextSelectionUtils.cupertinoTextSelectionControls;
+            paintCursorAboveText = true;
+            cursorOpacityAnimates = true;
+            cursorColor = cursorColor ?? CupertinoTheme.of(context).primaryColor;
+            cursorRadius = cursorRadius?? Radius.circular(2.0f);
+            cursorOffset = new Offset(SelectableTextUtils.iOSHorizontalOffset / MediaQuery.of(context).devicePixelRatio, 0);
+            break;
+
+        default:
+            forcePressEnabled = false;
+            textSelectionControls = _MaterialTextSelectionControls.materialTextSelectionControls;
+            paintCursorAboveText = false;
+            cursorOpacityAnimates = false;
+            cursorColor = cursorColor ?? themeData.cursorColor;
+            break;
+    }
+
+    DefaultTextStyle defaultTextStyle = DefaultTextStyle.of(context);
+    TextStyle effectiveTextStyle = widget.style;
+    if (widget.style == null || widget.style.inherit)
+      effectiveTextStyle = defaultTextStyle.style.merge(widget.style);
+    if (MediaQuery.boldTextOverride(context))
+      effectiveTextStyle = effectiveTextStyle.merge(new TextStyle(fontWeight: FontWeight.bold));
+    
+    Widget child = new RepaintBoundary(
+      child: new EditableText(
+        key: editableTextKey,
+        style: effectiveTextStyle,
+        readOnly: true,
+        textWidthBasis: widget.textWidthBasis ?? defaultTextStyle.textWidthBasis,
+        showSelectionHandles: _showSelectionHandles,
+        showCursor: widget.showCursor,
+        controller: _controller,
+        focusNode: focusNode,
+        strutStyle: widget.strutStyle ?? new StrutStyle(),
+        textAlign: widget.textAlign ?? defaultTextStyle.textAlign ?? TextAlign.start,
+        textDirection: widget.textDirection,
+        textScaleFactor: widget.textScaleFactor,
+        autofocus: widget.autofocus,
+        forceLine: false,
+        toolbarOptions: widget.toolbarOptions,
+        minLines: widget.minLines,
+        maxLines: widget.maxLines ?? defaultTextStyle.maxLines,
+        selectionColor: themeData.textSelectionColor,
+        selectionControls: widget.selectionEnabled ? textSelectionControls : null,
+        onSelectionChanged: _handleSelectionChanged,
+        onSelectionHandleTapped: _handleSelectionHandleTapped,
+        rendererIgnoresPointer: true,
+        cursorWidth: widget.cursorWidth,
+        cursorRadius: cursorRadius,
+        cursorColor: cursorColor,
+        cursorOpacityAnimates: cursorOpacityAnimates,
+        cursorOffset: cursorOffset,
+        paintCursorAboveText: paintCursorAboveText,
+        backgroundCursorColor: CupertinoColors.inactiveGray,
+        enableInteractiveSelection: widget.enableInteractiveSelection,
+        dragStartBehavior: widget.dragStartBehavior,
+        scrollPhysics: widget.scrollPhysics
+      )
+    );
+
+    return _selectionGestureDetectorBuilder.buildGestureDetector(
+        behavior: HitTestBehavior.translucent,
+        child: child
+    );
+        }
+    }
+}