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Unverified Commit f62a1280 authored by Viren Khatri's avatar Viren Khatri Committed by GitHub
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Allow users to center align the floating label (#90157) 

Adds floatingLabelAlignment to position the label above the field.
parent f641849a
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Showing with 372 additions and 17 deletions
packages/flutter/lib/src/material/input_decorator.dart
View file @ f62a1280
......@@ -467,7 +467,14 @@ class _HelperErrorState extends State<_HelperError> with SingleTickerProviderSta
}
}
/// Defines the behavior of the floating label.
/// Defines **how** the floating label should behave.
///
/// See also:
///
/// * [InputDecoration.floatingLabelBehavior] which defines the behavior for
/// [InputDecoration.label] or [InputDecoration.labelText].
/// * [FloatingLabelAlignment] which defines **where** the floating label
/// should displayed.
enum FloatingLabelBehavior {
/// The label will always be positioned within the content, or hidden.
never,
......@@ -477,6 +484,57 @@ enum FloatingLabelBehavior {
always,
}
/// Defines **where** the floating label should be displayed within an
/// [InputDecorator].
///
/// See also:
///
/// * [InputDecoration.floatingLabelAlignment] which defines the alignment for
/// [InputDecoration.label] or [InputDecoration.labelText].
/// * [FloatingLabelBehavior] which defines **how** the floating label should
/// behave.
@immutable
class FloatingLabelAlignment {
const FloatingLabelAlignment._(this._x) : assert(_x != null),
assert(_x >= -1.0 && _x <= 1.0);
// -1 denotes start, 0 denotes center, and 1 denotes end.
final double _x;
/// Align the floating label on the leading edge of the [InputDecorator].
///
/// For left-to-right text ([TextDirection.ltr]), this is the left edge.
///
/// For right-to-left text ([TextDirection.rtl]), this is the right edge.
static const FloatingLabelAlignment start = FloatingLabelAlignment._(-1.0);
/// Aligns the floating label to the center of an [InputDecorator].
static const FloatingLabelAlignment center = FloatingLabelAlignment._(0.0);
@override
int get hashCode => _x.hashCode;
@override
bool operator ==(Object other) {
if (identical(this, other))
return true;
if (other.runtimeType != runtimeType)
return false;
return other is FloatingLabelAlignment
&& _x == other._x;
}
static String _stringify(double x) {
if (x == -1.0)
return 'FloatingLabelAlignment.start';
if (x == 0.0)
return 'FloatingLabelAlignment.center';
return 'FloatingLabelAlignment(x: ${x.toStringAsFixed(1)})';
}
@override
String toString() => _stringify(_x);
}
// Identifies the children of a _RenderDecorationElement.
enum _DecorationSlot {
icon,
......@@ -500,6 +558,7 @@ class _Decoration {
required this.isCollapsed,
required this.floatingLabelHeight,
required this.floatingLabelProgress,
required this.floatingLabelAlignment,
this.border,
this.borderGap,
required this.alignLabelWithHint,
......@@ -519,12 +578,14 @@ class _Decoration {
}) : assert(contentPadding != null),
assert(isCollapsed != null),
assert(floatingLabelHeight != null),
assert(floatingLabelProgress != null);
assert(floatingLabelProgress != null),
assert(floatingLabelAlignment != null);
final EdgeInsetsGeometry contentPadding;
final bool isCollapsed;
final double floatingLabelHeight;
final double floatingLabelProgress;
final FloatingLabelAlignment floatingLabelAlignment;
final InputBorder? border;
final _InputBorderGap? borderGap;
final bool alignLabelWithHint;
......@@ -553,6 +614,7 @@ class _Decoration {
&& other.isCollapsed == isCollapsed
&& other.floatingLabelHeight == floatingLabelHeight
&& other.floatingLabelProgress == floatingLabelProgress
&& other.floatingLabelAlignment == floatingLabelAlignment
&& other.border == border
&& other.borderGap == borderGap
&& other.alignLabelWithHint == alignLabelWithHint
......@@ -577,6 +639,7 @@ class _Decoration {
contentPadding,
floatingLabelHeight,
floatingLabelProgress,
floatingLabelAlignment,
border,
borderGap,
alignLabelWithHint,
......@@ -1470,17 +1533,28 @@ class _RenderDecoration extends RenderBox {
if (label != null) {
final double labelX = _boxParentData(label!).offset.dx;
// +1 shifts the range of x from (-1.0, 1.0) to (0.0, 2.0).
final double floatAlign = decoration.floatingLabelAlignment._x + 1;
final double floatWidth = _boxSize(label).width * _kFinalLabelScale;
// When floating label is centered, its x is relative to
// _BorderContainer's x and is independent of label's x.
switch (textDirection) {
case TextDirection.rtl:
decoration.borderGap!.start = labelX + label!.size.width;
decoration.borderGap!.start = lerpDouble(labelX + _boxSize(label).width,
_boxSize(container).width / 2.0 + floatWidth / 2.0,
floatAlign);
break;
case TextDirection.ltr:
// The value of _InputBorderGap.start is relative to the origin of the
// _BorderContainer which is inset by the icon's width.
decoration.borderGap!.start = labelX - _boxSize(icon).width;
// _BorderContainer which is inset by the icon's width. Although, when
// floating label is centered, it's already relative to _BorderContainer.
decoration.borderGap!.start = lerpDouble(labelX - _boxSize(icon).width,
_boxSize(container).width / 2.0 - floatWidth / 2.0,
floatAlign);
break;
}
decoration.borderGap!.extent = label!.size.width * 0.75;
decoration.borderGap!.extent = label!.size.width * _kFinalLabelScale;
} else {
decoration.borderGap!.start = null;
decoration.borderGap!.extent = 0.0;
......@@ -1505,7 +1579,11 @@ class _RenderDecoration extends RenderBox {
if (label != null) {
final Offset labelOffset = _boxParentData(label!).offset;
final double labelHeight = label!.size.height;
final double labelHeight = _boxSize(label).height;
final double labelWidth = _boxSize(label).width;
// +1 shifts the range of x from (-1.0, 1.0) to (0.0, 2.0).
final double floatAlign = decoration.floatingLabelAlignment._x + 1;
final double floatWidth = labelWidth * _kFinalLabelScale;
final double borderWeight = decoration.border!.borderSide.width;
final double t = decoration.floatingLabelProgress;
// The center of the outline border label ends up a little below the
......@@ -1515,15 +1593,19 @@ class _RenderDecoration extends RenderBox {
// Center the scaled label relative to the border.
final double floatingY = isOutlineBorder ? (-labelHeight * _kFinalLabelScale) / 2.0 + borderWeight / 2.0 : contentPadding.top;
final double scale = lerpDouble(1.0, _kFinalLabelScale, t)!;
final double dx;
final double centeredFloatX = _boxParentData(container!).offset.dx +
_boxSize(container).width / 2.0 - floatWidth / 2.0;
final double floatStartX;
switch (textDirection) {
case TextDirection.rtl:
dx = labelOffset.dx + label!.size.width * (1.0 - scale); // origin is on the right
case TextDirection.rtl: // origin is on the right
floatStartX = labelOffset.dx + labelWidth * (1.0 - scale);
break;
case TextDirection.ltr:
dx = labelOffset.dx; // origin on the left
case TextDirection.ltr: // origin on the left
floatStartX = labelOffset.dx;
break;
}
final double floatEndX = lerpDouble(floatStartX, centeredFloatX, floatAlign)!;
final double dx = lerpDouble(floatStartX, floatEndX, t)!;
final double dy = lerpDouble(0.0, floatingY - labelOffset.dy, t)!;
_labelTransform = Matrix4.identity()
..translate(dx, labelOffset.dy + dy)
......@@ -2443,6 +2525,7 @@ class _InputDecoratorState extends State<InputDecorator> with TickerProviderStat
contentPadding: contentPadding,
isCollapsed: decoration!.isCollapsed,
floatingLabelHeight: floatingLabelHeight,
floatingLabelAlignment: decoration!.floatingLabelAlignment!,
floatingLabelProgress: _floatingLabelController.value,
border: border,
borderGap: _borderGap,
......@@ -2585,6 +2668,7 @@ class InputDecoration {
this.errorStyle,
this.errorMaxLines,
this.floatingLabelBehavior,
this.floatingLabelAlignment,
this.isCollapsed = false,
this.isDense,
this.contentPadding,
......@@ -2630,6 +2714,7 @@ class InputDecoration {
const InputDecoration.collapsed({
required this.hintText,
this.floatingLabelBehavior,
this.floatingLabelAlignment,
this.hintStyle,
this.hintTextDirection,
this.filled = false,
......@@ -2709,8 +2794,9 @@ class InputDecoration {
/// When the input field is empty and unfocused, the label is displayed on
/// top of the input field (i.e., at the same location on the screen where
/// text may be entered in the input field). When the input field receives
/// focus (or if the field is non-empty), the label moves above (i.e.,
/// vertically adjacent to) the input field.
/// focus (or if the field is non-empty), depending on [floatingLabelAlignment],
/// the label moves above, either vertically adjacent to, or to the center of
/// the input field.
/// {@endtemplate}
///
/// This can be used, for example, to add multiple [TextStyle]'s to a label that would
......@@ -2853,7 +2939,7 @@ class InputDecoration {
final int? errorMaxLines;
/// {@template flutter.material.inputDecoration.floatingLabelBehavior}
/// Defines how the floating label should be displayed.
/// Defines **how** the floating label should behave.
///
/// When [FloatingLabelBehavior.auto] the label will float to the top only when
/// the field is focused or has some text content, otherwise it will appear
......@@ -2867,8 +2953,33 @@ class InputDecoration {
/// {@endtemplate}
///
/// If null, [InputDecorationTheme.floatingLabelBehavior] will be used.
///
/// See also:
///
/// * [floatingLabelAlignment] which defines **where** the floating label
/// should be displayed.
final FloatingLabelBehavior? floatingLabelBehavior;
/// {@template flutter.material.inputDecoration.floatingLabelAlignment}
/// Defines **where** the floating label should be displayed.
///
/// [FloatingLabelAlignment.start] aligns the floating label to the leftmost
/// (when [TextDirection.ltr]) or rightmost (when [TextDirection.rtl]),
/// possible position, which is vertically adjacent to the label, on top of
/// the field.
///
/// [FloatingLabelAlignment.center] aligns the floating label to the center on
/// top of the field.
/// {@endtemplate}
///
/// If null, [InputDecorationTheme.floatingLabelAlignment] will be used.
///
/// See also:
///
/// * [floatingLabelBehavior] which defines **how** the floating label should
/// behave.
final FloatingLabelAlignment? floatingLabelAlignment;
/// Whether the [InputDecorator.child] is part of a dense form (i.e., uses less vertical
/// space).
///
......@@ -3441,6 +3552,7 @@ class InputDecoration {
TextStyle? errorStyle,
int? errorMaxLines,
FloatingLabelBehavior? floatingLabelBehavior,
FloatingLabelAlignment? floatingLabelAlignment,
bool? isCollapsed,
bool? isDense,
EdgeInsetsGeometry? contentPadding,
......@@ -3492,6 +3604,7 @@ class InputDecoration {
errorStyle: errorStyle ?? this.errorStyle,
errorMaxLines: errorMaxLines ?? this.errorMaxLines,
floatingLabelBehavior: floatingLabelBehavior ?? this.floatingLabelBehavior,
floatingLabelAlignment: floatingLabelAlignment ?? this.floatingLabelAlignment,
isCollapsed: isCollapsed ?? this.isCollapsed,
isDense: isDense ?? this.isDense,
contentPadding: contentPadding ?? this.contentPadding,
......@@ -3542,6 +3655,7 @@ class InputDecoration {
errorStyle: errorStyle ?? theme.errorStyle,
errorMaxLines: errorMaxLines ?? theme.errorMaxLines,
floatingLabelBehavior: floatingLabelBehavior ?? theme.floatingLabelBehavior,
floatingLabelAlignment: floatingLabelAlignment ?? theme.floatingLabelAlignment,
isCollapsed: isCollapsed,
isDense: isDense ?? theme.isDense,
contentPadding: contentPadding ?? theme.contentPadding,
......@@ -3587,6 +3701,7 @@ class InputDecoration {
&& other.errorStyle == errorStyle
&& other.errorMaxLines == errorMaxLines
&& other.floatingLabelBehavior == floatingLabelBehavior
&& other.floatingLabelAlignment == floatingLabelAlignment
&& other.isDense == isDense
&& other.contentPadding == contentPadding
&& other.isCollapsed == isCollapsed
......@@ -3641,6 +3756,7 @@ class InputDecoration {
errorStyle,
errorMaxLines,
floatingLabelBehavior,
floatingLabelAlignment,
isDense,
contentPadding,
isCollapsed,
......@@ -3695,6 +3811,7 @@ class InputDecoration {
if (errorStyle != null) 'errorStyle: "$errorStyle"',
if (errorMaxLines != null) 'errorMaxLines: "$errorMaxLines"',
if (floatingLabelBehavior != null) 'floatingLabelBehavior: $floatingLabelBehavior',
if (floatingLabelAlignment != null) 'floatingLabelAlignment: $floatingLabelAlignment',
if (isDense ?? false) 'isDense: $isDense',
if (contentPadding != null) 'contentPadding: $contentPadding',
if (isCollapsed) 'isCollapsed: $isCollapsed',
......@@ -3746,8 +3863,8 @@ class InputDecorationTheme with Diagnosticable {
/// Creates a value for [ThemeData.inputDecorationTheme] that
/// defines default values for [InputDecorator].
///
/// The values of [isDense], [isCollapsed], [filled], and [border] must
/// not be null.
/// The values of [isDense], [isCollapsed], [filled], [floatingLabelAlignment],
/// and [border] must not be null.
const InputDecorationTheme({
this.labelStyle,
this.floatingLabelStyle,
......@@ -3757,6 +3874,7 @@ class InputDecorationTheme with Diagnosticable {
this.errorStyle,
this.errorMaxLines,
this.floatingLabelBehavior = FloatingLabelBehavior.auto,
this.floatingLabelAlignment = FloatingLabelAlignment.start,
this.isDense = false,
this.contentPadding,
this.isCollapsed = false,
......@@ -3780,6 +3898,7 @@ class InputDecorationTheme with Diagnosticable {
this.constraints,
}) : assert(isDense != null),
assert(isCollapsed != null),
assert(floatingLabelAlignment != null),
assert(filled != null),
assert(alignLabelWithHint != null);
......@@ -3869,6 +3988,11 @@ class InputDecorationTheme with Diagnosticable {
/// Defaults to [FloatingLabelBehavior.auto].
final FloatingLabelBehavior floatingLabelBehavior;
/// {@macro flutter.material.inputDecoration.floatingLabelAlignment}
///
/// Defaults to [FloatingLabelAlignment.start].
final FloatingLabelAlignment floatingLabelAlignment;
/// Whether the input decorator's child is part of a dense form (i.e., uses
/// less vertical space).
///
......@@ -4177,6 +4301,7 @@ class InputDecorationTheme with Diagnosticable {
TextStyle? errorStyle,
int? errorMaxLines,
FloatingLabelBehavior? floatingLabelBehavior,
FloatingLabelAlignment? floatingLabelAlignment,
bool? isDense,
EdgeInsetsGeometry? contentPadding,
bool? isCollapsed,
......@@ -4208,6 +4333,7 @@ class InputDecorationTheme with Diagnosticable {
errorStyle: errorStyle ?? this.errorStyle,
errorMaxLines: errorMaxLines ?? this.errorMaxLines,
floatingLabelBehavior: floatingLabelBehavior ?? this.floatingLabelBehavior,
floatingLabelAlignment: floatingLabelAlignment ?? this.floatingLabelAlignment,
isDense: isDense ?? this.isDense,
contentPadding: contentPadding ?? this.contentPadding,
iconColor: iconColor,
......@@ -4243,6 +4369,7 @@ class InputDecorationTheme with Diagnosticable {
errorStyle,
errorMaxLines,
floatingLabelBehavior,
floatingLabelAlignment,
isDense,
contentPadding,
isCollapsed,
......@@ -4291,6 +4418,7 @@ class InputDecorationTheme with Diagnosticable {
&& other.suffixIconColor == suffixIconColor
&& other.counterStyle == counterStyle
&& other.floatingLabelBehavior == floatingLabelBehavior
&& other.floatingLabelAlignment == floatingLabelAlignment
&& other.filled == filled
&& other.fillColor == fillColor
&& other.focusColor == focusColor
......@@ -4318,6 +4446,7 @@ class InputDecorationTheme with Diagnosticable {
properties.add(DiagnosticsProperty<TextStyle>('errorStyle', errorStyle, defaultValue: defaultTheme.errorStyle));
properties.add(IntProperty('errorMaxLines', errorMaxLines, defaultValue: defaultTheme.errorMaxLines));
properties.add(DiagnosticsProperty<FloatingLabelBehavior>('floatingLabelBehavior', floatingLabelBehavior, defaultValue: defaultTheme.floatingLabelBehavior));
properties.add(DiagnosticsProperty<FloatingLabelAlignment>('floatingLabelAlignment', floatingLabelAlignment, defaultValue: defaultTheme.floatingLabelAlignment));
properties.add(DiagnosticsProperty<bool>('isDense', isDense, defaultValue: defaultTheme.isDense));
properties.add(DiagnosticsProperty<EdgeInsetsGeometry>('contentPadding', contentPadding, defaultValue: defaultTheme.contentPadding));
properties.add(DiagnosticsProperty<bool>('isCollapsed', isCollapsed, defaultValue: defaultTheme.isCollapsed));
......
packages/flutter/test/material/input_decorator_test.dart
View file @ f62a1280
......@@ -2963,6 +2963,232 @@ void main() {
expect(tester.getTopRight(find.text('hint')).dx, 760.0);
});
testWidgets('FloatingLabelAlignment.toString()', (WidgetTester tester) async {
expect(FloatingLabelAlignment.start.toString(), 'FloatingLabelAlignment.start');
expect(FloatingLabelAlignment.center.toString(), 'FloatingLabelAlignment.center');
});
group('floatingLabelAlignment', () {
Widget buildInputDecoratorWithFloatingLabel({required TextDirection textDirection,
required bool hasIcon,
required FloatingLabelAlignment alignment,
bool borderIsOutline = false,
}) => buildInputDecorator(
// isEmpty: false (default)
// isFocused: false (default)
textDirection: textDirection,
decoration: InputDecoration(
contentPadding: const EdgeInsetsDirectional.only(start: 40.0, top: 12.0, bottom: 12.0),
floatingLabelAlignment: alignment,
icon: hasIcon ? const Icon(Icons.insert_link) : null,
labelText: 'label',
hintText: 'hint',
filled: true,
border: borderIsOutline ? const OutlineInputBorder() : null,
),
);
group('LTR with icon aligned', () {
testWidgets('start', (WidgetTester tester) async {
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.ltr,
hasIcon: true,
alignment: FloatingLabelAlignment.start,
// borderIsOutline: false, (default)
),
);
// icon (40) + contentPadding (40)
expect(tester.getTopLeft(find.text('label')).dx, 80.0);
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.ltr,
hasIcon: true,
alignment: FloatingLabelAlignment.start,
borderIsOutline: true,
),
);
// icon (40) + contentPadding (40)
expect(tester.getTopLeft(find.text('label')).dx, 80.0);
});
testWidgets('center', (WidgetTester tester) async {
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.ltr,
hasIcon: true,
alignment: FloatingLabelAlignment.center,
// borderIsOutline: false, (default)
),
);
// icon (40) + (decorator (800) - icon (40)) / 2
expect(tester.getCenter(find.text('label')).dx, 420.0);
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.ltr,
hasIcon: true,
alignment: FloatingLabelAlignment.center,
borderIsOutline: true,
),
);
// icon (40) + (decorator (800) - icon (40)) / 2
expect(tester.getCenter(find.text('label')).dx, 420.0);
});
});
group('LTR without icon aligned', () {
testWidgets('start', (WidgetTester tester) async {
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.ltr,
hasIcon: false,
alignment: FloatingLabelAlignment.start,
// borderIsOutline: false, (default)
),
);
// contentPadding (40)
expect(tester.getTopLeft(find.text('label')).dx, 40.0);
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.ltr,
hasIcon: false,
alignment: FloatingLabelAlignment.start,
borderIsOutline: true,
),
);
// contentPadding (40)
expect(tester.getTopLeft(find.text('label')).dx, 40.0);
});
testWidgets('center', (WidgetTester tester) async {
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.ltr,
hasIcon: false,
alignment: FloatingLabelAlignment.center,
// borderIsOutline: false, (default)
),
);
// decorator (800) / 2
expect(tester.getCenter(find.text('label')).dx, 400.0);
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.ltr,
hasIcon: false,
alignment: FloatingLabelAlignment.center,
borderIsOutline: true,
),
);
// decorator (800) / 2
expect(tester.getCenter(find.text('label')).dx, 400.0);
});
});
group('RTL with icon aligned', () {
testWidgets('start', (WidgetTester tester) async {
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.rtl,
hasIcon: true,
alignment: FloatingLabelAlignment.start,
// borderIsOutline: false, (default)
),
);
// decorator (800) - icon (40) - contentPadding (40)
expect(tester.getTopRight(find.text('label')).dx, 720.0);
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.rtl,
hasIcon: true,
alignment: FloatingLabelAlignment.start,
borderIsOutline: true,
),
);
// decorator (800) - icon (40) - contentPadding (40)
expect(tester.getTopRight(find.text('label')).dx, 720.0);
});
testWidgets('center', (WidgetTester tester) async {
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.rtl,
hasIcon: true,
alignment: FloatingLabelAlignment.center,
// borderIsOutline: false, (default)
),
);
// (decorator (800) / icon (40)) / 2
expect(tester.getCenter(find.text('label')).dx, 380.0);
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.rtl,
hasIcon: true,
alignment: FloatingLabelAlignment.center,
borderIsOutline: true,
),
);
// (decorator (800) / icon (40)) / 2
expect(tester.getCenter(find.text('label')).dx, 380.0);
});
});
group('RTL without icon aligned', () {
testWidgets('start', (WidgetTester tester) async {
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.rtl,
hasIcon: false,
alignment: FloatingLabelAlignment.start,
// borderIsOutline: false, (default)
),
);
// decorator (800) - contentPadding (40)
expect(tester.getTopRight(find.text('label')).dx, 760.0);
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.rtl,
hasIcon: false,
alignment: FloatingLabelAlignment.start,
borderIsOutline: true,
),
);
// decorator (800) - contentPadding (40)
expect(tester.getTopRight(find.text('label')).dx, 760.0);
});
testWidgets('center', (WidgetTester tester) async {
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.rtl,
hasIcon: false,
alignment: FloatingLabelAlignment.center,
// borderIsOutline: false, (default)
),
);
// decorator (800) / 2
expect(tester.getCenter(find.text('label')).dx, 400.0);
await tester.pumpWidget(
buildInputDecoratorWithFloatingLabel(
textDirection: TextDirection.rtl,
hasIcon: false,
alignment: FloatingLabelAlignment.center,
borderIsOutline: true,
),
);
// decorator (800) / 2
expect(tester.getCenter(find.text('label')).dx, 400.0);
});
});
});
testWidgets('InputDecorator prefix/suffix dense layout', (WidgetTester tester) async {
await tester.pumpWidget(
buildInputDecorator(
......
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