Change the text/selection value API of the input field

(see https://github.com/flutter/flutter/issues/1586)

examples/fitness/lib/meal.dart

@@ -51,10 +51,10 @@ class MealFragment extends StatefulComponent {
 }
 
 class MealFragmentState extends State<MealFragment> {
-  String _description = "";
+  InputValue _description = InputValue.empty;
 
   void _handleSave() {
-    config.onCreated(new Meal(when: new DateTime.now(), description: _description));
+    config.onCreated(new Meal(when: new DateTime.now(), description: _description.text));
     Navigator.pop(context);
   }
 
@@ -75,7 +75,7 @@ class MealFragmentState extends State<MealFragment> {
     );
   }
 
-  void _handleDescriptionChanged(String description) {
+  void _handleDescriptionChanged(InputValue description) {
     setState(() {
       _description = description;
     });

examples/fitness/lib/measurement.dart

@@ -63,13 +63,13 @@ class MeasurementFragment extends StatefulComponent {
 }
 
 class MeasurementFragmentState extends State<MeasurementFragment> {
-  String _weight = "";
+  InputValue _weight = InputValue.empty;
   DateTime _when = new DateTime.now();
 
   void _handleSave() {
     double parsedWeight;
     try {
-      parsedWeight = double.parse(_weight);
+      parsedWeight = double.parse(_weight.text);
     } on FormatException catch(e) {
       print("Exception $e");
       Scaffold.of(context).showSnackBar(new SnackBar(
@@ -97,7 +97,7 @@ class MeasurementFragmentState extends State<MeasurementFragment> {
     );
   }
 
-  void _handleWeightChanged(String weight) {
+  void _handleWeightChanged(InputValue weight) {
     setState(() {
       _weight = weight;
     });

examples/fitness/lib/settings.dart

@@ -4,6 +4,64 @@
 
 part of fitness;
 
+class _SettingsDialog extends StatefulComponent {
+  _SettingsDialogState createState() => new _SettingsDialogState();
+}
+
+class _SettingsDialogState extends State<_SettingsDialog> {
+  final GlobalKey weightGoalKey = new GlobalKey();
+
+  InputValue _goalWeight = InputValue.empty;
+
+  void _handleGoalWeightChanged(InputValue goalWeight) {
+    setState(() {
+      _goalWeight = goalWeight;
+    });
+  }
+
+  void _handleGoalWeightSubmitted(InputValue goalWeight) {
+    _goalWeight = goalWeight;
+    _handleSavePressed();
+  }
+
+  void _handleSavePressed() {
+    double goalWeight;
+    try {
+      goalWeight = double.parse(_goalWeight.text);
+    } on FormatException {
+      goalWeight = 0.0;
+    }
+    Navigator.pop(context, goalWeight);
+  }
+
+  Widget build(BuildContext context) {
+    return new Dialog(
+      title: new Text("Goal Weight"),
+      content: new Input(
+        key: weightGoalKey,
+        value: _goalWeight,
+        autofocus: true,
+        hintText: 'Goal weight in lbs',
+        keyboardType: KeyboardType.number,
+        onChanged: _handleGoalWeightChanged,
+        onSubmitted: _handleGoalWeightSubmitted
+      ),
+      actions: <Widget>[
+        new FlatButton(
+          child: new Text('CANCEL'),
+          onPressed: () {
+            Navigator.pop(context);
+          }
+        ),
+        new FlatButton(
+          child: new Text('SAVE'),
+          onPressed: _handleSavePressed
+        ),
+      ]
+    );
+  }
+}
+
 typedef void SettingsUpdater({
   BackupMode backup,
   double goalWeight
@@ -36,52 +94,10 @@ class SettingsFragmentState extends State<SettingsFragment> {
     return "${config.userData.goalWeight}";
   }
 
-  static final GlobalKey weightGoalKey = new GlobalKey();
-
-  double _goalWeight;
-
-  void _handleGoalWeightChanged(String goalWeight) {
-    // TODO(jackson): Looking for null characters to detect enter key is a hack
-    if (goalWeight.endsWith("\u{0}")) {
-      Navigator.pop(context, double.parse(goalWeight.replaceAll("\u{0}", "")));
-    } else {
-      setState(() {
-        try {
-          _goalWeight = double.parse(goalWeight);
-        } on FormatException {
-          _goalWeight = 0.0;
-        }
-      });
-    }
-  }
-
   Future _handleGoalWeightPressed() async {
     double goalWeight = await showDialog(
       context: context,
-      child: new Dialog(
-        title: new Text("Goal Weight"),
-        content: new Input(
-          key: weightGoalKey,
-          autofocus: true,
-          hintText: 'Goal weight in lbs',
-          keyboardType: KeyboardType.number,
-          onChanged: _handleGoalWeightChanged
-        ),
-        actions: <Widget>[
-          new FlatButton(
-            child: new Text('CANCEL'),
-            onPressed: () {
-              Navigator.pop(context);
-            }
-          ),
-          new FlatButton(
-            child: new Text('SAVE'),
-            onPressed: () {
-              Navigator.pop(context, _goalWeight);
-            }
-          ),
-        ]
-      )
+      child: new _SettingsDialog()
     );
     config.updater(goalWeight: goalWeight);
   }

examples/stocks/lib/stock_home.dart

@@ -33,14 +33,14 @@ class StockHomeState extends State<StockHome> {
 
   final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>();
   bool _isSearching = false;
-  String _searchQuery;
+  InputValue _searchQuery = InputValue.empty;
 
   void _handleSearchBegin() {
     ModalRoute.of(context).addLocalHistoryEntry(new LocalHistoryEntry(
       onRemove: () {
         setState(() {
           _isSearching = false;
-          _searchQuery = null;
+          _searchQuery = InputValue.empty;
         });
       }
     ));
@@ -53,7 +53,7 @@ class StockHomeState extends State<StockHome> {
     Navigator.pop(context);
   }
 
-  void _handleSearchQueryChanged(String query) {
+  void _handleSearchQueryChanged(InputValue query) {
     setState(() {
       _searchQuery = query;
     });
@@ -197,9 +197,9 @@ class StockHomeState extends State<StockHome> {
   }
 
   Iterable<Stock> _filterBySearchQuery(Iterable<Stock> stocks) {
-    if (_searchQuery == null)
+    if (_searchQuery.text.isEmpty)
       return stocks;
-    RegExp regexp = new RegExp(_searchQuery, caseSensitive: false);
+    RegExp regexp = new RegExp(_searchQuery.text, caseSensitive: false);
     return stocks.where((Stock stock) => stock.symbol.contains(regexp));
   }
 
@@ -254,6 +254,7 @@ class StockHomeState extends State<StockHome> {
         tooltip: 'Back'
       ),
       center: new Input(
+        value: _searchQuery,
         key: searchFieldKey,
         autofocus: true,
         hintText: 'Search stocks',

examples/widgets/card_collection.dart

@@ -7,12 +7,12 @@ import 'package:flutter/rendering.dart' show debugDumpRenderTree;
 
 class CardModel {
   CardModel(this.value, this.height) {
-    label = "Item $value";
+    inputValue = new InputValue(text: "Item $value");
   }
   int value;
   double height;
   int get color => ((value % 9) + 1) * 100;
-  String label;
+  InputValue inputValue;
   Key get key => new ObjectKey(this);
 }
 
@@ -305,9 +305,11 @@ class CardCollectionState extends State<CardCollection> {
             new Center(
               child: new Input(
                 key: new GlobalObjectKey(cardModel),
-                initialValue: cardModel.label,
-                onChanged: (String value) {
-                  cardModel.label = value;
+                value: cardModel.inputValue,
+                onChanged: (InputValue value) {
+                  setState(() {
+                    cardModel.inputValue = value;
+                  });
                 }
               )
             )
@@ -317,7 +319,7 @@ class CardCollectionState extends State<CardCollection> {
               ),
               child: new Column(
                 children: <Widget>[
-                  new Text(cardModel.label)
+                  new Text(cardModel.inputValue.text)
                 ],
                 alignItems: FlexAlignItems.stretch,
                 justifyContent: FlexJustifyContent.center

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

@@ -4,7 +4,6 @@
 
 import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
-import 'package:sky_services/editing/editing.mojom.dart' as mojom;
 
 import 'colors.dart';
 import 'debug.dart';
@@ -17,8 +16,7 @@ export 'package:sky_services/editing/editing.mojom.dart' show KeyboardType;
 class Input extends StatefulComponent {
   Input({
     GlobalKey key,
-    this.initialValue: '',
-    this.initialSelection,
+    this.value: InputValue.empty,
     this.keyboardType: KeyboardType.text,
     this.icon,
     this.labelText,
@@ -34,11 +32,8 @@ class Input extends StatefulComponent {
     assert(key != null);
   }
 
-  /// The initial editable text for the input field.
-  final String initialValue;
-
-  /// The initial selection for this input field.
-  final TextSelection initialSelection;
+  /// The text of the input field.
+  final InputValue value;
 
   /// The type of keyboard to use for editing the text.
   final KeyboardType keyboardType;
@@ -68,10 +63,10 @@ class Input extends StatefulComponent {
   final bool autofocus;
 
   /// Called when the text being edited changes.
-  final ValueChanged<String> onChanged;
+  final ValueChanged<InputValue> onChanged;
 
   /// Called when the user indicates that they are done editing the text in the field.
-  final ValueChanged<String> onSubmitted;
+  final ValueChanged<InputValue> onSubmitted;
 
   _InputState createState() => new _InputState();
 }
@@ -80,89 +75,13 @@ const Duration _kTransitionDuration = const Duration(milliseconds: 200);
 const Curve _kTransitionCurve = Curves.ease;
 
 class _InputState extends State<Input> {
-  String _value;
-  EditableString _editableString;
-  KeyboardHandle _keyboardHandle;
-
-  // Used by tests.
-  EditableString get editableValue => _editableString;
-
-  void initState() {
-    super.initState();
-    _value = config.initialValue;
-    _editableString = new EditableString(
-      text: _value,
-      selection: config.initialSelection,
-      onUpdated: _handleTextUpdated,
-      onSubmitted: _handleTextSubmitted
-    );
-  }
-
-  void dispose() {
-    if (_isAttachedToKeyboard)
-      _keyboardHandle.release();
-    super.dispose();
-  }
-
-  bool get _isAttachedToKeyboard => _keyboardHandle != null && _keyboardHandle.attached;
-
-  void _attachOrDetachKeyboard(bool focused) {
-    if (focused && !_isAttachedToKeyboard) {
-      _keyboardHandle = keyboard.attach(_editableString.createStub(),
-                                        new mojom.KeyboardConfiguration()
-                                          ..type = config.keyboardType);
-      _keyboardHandle.setEditingState(_editableString.editingState);
-      _keyboardHandle.show();
-    } else if (!focused && _isAttachedToKeyboard) {
-      _keyboardHandle.release();
-      _keyboardHandle = null;
-      _editableString.didDetachKeyboard();
-    }
-  }
-
-  void _requestKeyboard() {
-    if (Focus.at(context)) {
-      assert(_isAttachedToKeyboard);
-      _keyboardHandle.show();
-    } else {
-      Focus.moveTo(config.key);
-      // we'll get told to rebuild and we'll take care of the keyboard then
-    }
-  }
-
-  void _handleTextUpdated() {
-    if (_value != _editableString.text) {
-      setState(() {
-        _value = _editableString.text;
-      });
-      if (config.onChanged != null)
-        config.onChanged(_value);
-    }
-  }
-
-  void _handleTextSubmitted() {
-    Focus.clear(context);
-    if (config.onSubmitted != null)
-      config.onSubmitted(_value);
-  }
-
-  void _handleSelectionChanged(TextSelection selection) {
-    if (_isAttachedToKeyboard) {
-      _editableString.setSelection(selection);
-      _keyboardHandle.setEditingState(_editableString.editingState);
-    } else {
-      _editableString.setSelection(selection);
-      _requestKeyboard();
-    }
-  }
+  GlobalKey<RawInputLineState> _rawInputLineKey = new GlobalKey<RawInputLineState>();
 
   Widget build(BuildContext context) {
     assert(debugCheckHasMaterial(context));
     ThemeData themeData = Theme.of(context);
     bool focused = Focus.at(context, autofocus: config.autofocus);
 
-    _attachOrDetachKeyboard(focused);
-
     TextStyle textStyle = config.style ?? themeData.text.subhead;
     Color focusHighlightColor = themeData.accentColor;
     if (themeData.primarySwatch != null)
@@ -171,7 +90,7 @@ class _InputState extends State<Input> {
 
     List<Widget> stackChildren = <Widget>[];
 
-    bool hasInlineLabel = config.labelText != null && !focused && !_value.isNotEmpty;
+    bool hasInlineLabel = config.labelText != null && !focused && !config.value.text.isNotEmpty;
 
     if (config.labelText != null) {
       TextStyle labelStyle = hasInlineLabel ?
@@ -194,7 +113,7 @@ class _InputState extends State<Input> {
       topPadding += topPaddingIncrement;
     }
 
-    if (config.hintText != null && _value.isEmpty && !hasInlineLabel) {
+    if (config.hintText != null && config.value.text.isEmpty && !hasInlineLabel) {
       TextStyle hintStyle = themeData.text.subhead.copyWith(color: themeData.hintColor);
       stackChildren.add(new Positioned(
         left: 0.0,
@@ -234,14 +153,17 @@ class _InputState extends State<Input> {
           )
         )
       ),
-      child: new RawEditableLine(
-        value: _editableString,
-        focused: focused,
+      child: new RawInputLine(
+        key: _rawInputLineKey,
+        value: config.value,
+        focusKey: config.key,
         style: textStyle,
         hideText: config.hideText,
         cursorColor: cursorColor,
         selectionColor: cursorColor,
-        onSelectionChanged: _handleSelectionChanged
+        keyboardType: config.keyboardType,
+        onChanged: config.onChanged,
+        onSubmitted: config.onSubmitted
       )
     ));
 
@@ -278,7 +200,7 @@ class _InputState extends State<Input> {
 
     return new GestureDetector(
       behavior: HitTestBehavior.opaque,
-      onTap: _requestKeyboard,
+      onTap: () => _rawInputLineKey.currentState?.requestKeyboard(),
       child: new Padding(
         padding: const EdgeDims.symmetric(horizontal: 16.0),
         child: child

packages/flutter/lib/src/painting/text_editing.dart

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:ui' show TextAffinity, TextPosition;
+import 'dart:ui' show hashValues, TextAffinity, TextPosition;
 
 export 'dart:ui' show TextAffinity, TextPosition;
 
@@ -50,6 +50,22 @@ class TextRange {
     assert(isNormalized);
     return text.substring(start, end);
   }
+
+  bool operator ==(dynamic other) {
+    if (identical(this, other))
+      return true;
+    if (other is! TextRange)
+      return false;
+    TextRange typedOther = other;
+    return typedOther.start == start
+        && typedOther.end == end;
+  }
+
+  int get hashCode => hashValues(
+    start.hashCode,
+    end.hashCode
+  );
+
 }
 
 /// A range of text that represents a selection.
@@ -122,4 +138,23 @@ class TextSelection extends TextRange {
   String toString() {
     return '$runtimeType(baseOffset: $baseOffset, extentOffset: $extentOffset, affinity: $affinity, isDirectional: $isDirectional)';
   }
+
+  bool operator ==(dynamic other) {
+    if (identical(this, other))
+      return true;
+    if (other is! TextSelection)
+      return false;
+    TextSelection typedOther = other;
+    return typedOther.baseOffset == baseOffset
+        && typedOther.extentOffset == extentOffset
+        && typedOther.affinity == affinity
+        && typedOther.isDirectional == isDirectional;
+  }
+
+  int get hashCode => hashValues(
+    baseOffset.hashCode,
+    extentOffset.hashCode,
+    affinity.hashCode,
+    isDirectional.hashCode
+  );
 }

packages/flutter/test/widget/input_test.dart

@@ -30,15 +30,16 @@ void main() {
   test('Editable text has consistent size', () {
     testWidgets((WidgetTester tester) {
       GlobalKey inputKey = new GlobalKey();
-      String inputValue;
+      InputValue inputValue = InputValue.empty;
 
       Widget builder() {
         return new Center(
           child: new Material(
             child: new Input(
+              value: inputValue,
               key: inputKey,
               hintText: 'Placeholder',
-              onChanged: (String value) { inputValue = value; }
+              onChanged: (InputValue value) { inputValue = value; }
             )
           )
         );
@@ -58,7 +59,7 @@ void main() {
           ..composingExtent = testValue.length);
 
         // Check that the onChanged event handler fired.
-        expect(inputValue, equals(testValue));
+        expect(inputValue.text, equals(testValue));
 
         tester.pumpWidget(builder());
       }
@@ -88,7 +89,7 @@ void main() {
 
       tester.pumpWidget(builder());
 
-      RawEditableTextState editableText = tester.findStateOfType(RawEditableTextState);
+      RawInputLineState editableText = tester.findStateOfType(RawInputLineState);
 
       // Check that the cursor visibility toggles after each blink interval.
       void checkCursorToggle() {