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Fix TextField helper top padding on M3 (#145087)
## Description `InputDecorator` adds a 8.0 gap beetween the container and the helper text. From the Material 3 specification, this gap should be 4.0. See https://m3.material.io/components/text-fields/specs#0c5c8d6d-2169-4d42-960c-51f6ee42eb57. This PR sets the correct values for M3 without changing the value for M2. | Before | After | M3 Spec | |--------|--------|--------| | ![image](https://github.com/flutter/flutter/assets/840911/9947f334-d98f-4f7e-9da7-ca6d5c0770ac) | ![image](https://github.com/flutter/flutter/assets/840911/081dec4b-eb9f-4eee-a7dc-2538e7110ff0)| ![image](https://github.com/flutter/flutter/assets/840911/c8c8f045-3b79-43a5-a1a3-cc6d5460644f) | If this change is accepted, a future step will be to make this value configurable, probably by `InputDecorationTheme`. ## Related Issue Fixes https://github.com/flutter/flutter/issues/144984 ## Tests Updates a value used by several existing tests.
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@ -726,7 +726,9 @@ class _RenderDecoration extends RenderBox with SlottedContainerRenderObjectMixin
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_expands = expands,
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_material3 = material3;
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static const double subtextGap = 8.0;
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// TODO(bleroux): consider defining this value as a Material token and making it
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// configurable by InputDecorationTheme.
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double get subtextGap => material3 ? 4.0 : 8.0;
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RenderBox? get icon => childForSlot(_DecorationSlot.icon);
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RenderBox? get input => childForSlot(_DecorationSlot.input);
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@ -1504,23 +1504,20 @@ void main() {
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});
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group('Material3 - InputDecoration helper/counter/error', () {
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// Overall height for InputDecorator (filled or outlined) is 80dp on mobile:
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// Overall height for InputDecorator (filled or outlined) is 76dp on mobile:
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// 8 - top padding
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// 12 - floating label (font size = 16 * 0.75, line height is forced to 1.0)
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// 4 - gap between label and input
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// 24 - input text (font size = 16, line height = 1.5)
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// 8 - bottom padding
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// 8 - gap above supporting text
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// 4 - gap above helper/error/counter
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// 16 - helper/counter (font size = 12, line height is 1.5)
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const double topPadding = 8.0;
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const double floatingLabelHeight = 12.0;
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const double labelInputGap = 4.0;
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const double inputHeight = 24.0;
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const double bottomPadding = 8.0;
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// TODO(bleroux): make the InputDecorator implementation compliant with M3 spec by changing
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// the helperGap to 4.0 instead of 8.0.
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// See https://github.com/flutter/flutter/issues/144984.
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const double helperGap = 8.0;
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const double helperGap = 4.0;
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const double helperHeight = 16.0;
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const double containerHeight = topPadding + floatingLabelHeight + labelInputGap + inputHeight + bottomPadding; // 56.0
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const double fullHeight = containerHeight + helperGap + helperHeight; // 80.0 (should be 76.0 based on M3 spec)
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