Repository: flutter/flutter
File: packages/flutter/lib/src/material/time_picker.dart (Dart)

Code before:
                _kTimePickerInputSize.width - defaultTheme.dayPeriodPortraitSize.width - 12;
          case TimeOfDayFormat.a_space_h_colon_mm:
          case TimeOfDayFormat.h_colon_mm_space_a:
            timePickerWidth = _kTimePickerInputSize.width - (useMaterial3 ? 32 : 0);
        }
        timePickerSize = Size(timePickerWidth, _kTimePickerInputSize.height);
    }
    return Size(timePickerSize.width, timePickerSize.height * textScaleFactor);
  }

  @override
  Widget build(BuildContext context) {
    assert(debugCheckHasMediaQuery(context));
    final ThemeData theme = Theme.of(context);
    final TimePickerThemeData pickerTheme = TimePickerTheme.of(context);
    final _TimePickerDefaults defaultTheme =
        theme.useMaterial3 ? _TimePickerDefaultsM3(context) : _TimePickerDefaultsM2(context);
    final ShapeBorder shape = pickerTheme.shape ?? defaultTheme.shape;
    final Color entryModeIconColor =
        pickerTheme.entryModeIconColor ?? defaultTheme.entryModeIconColor;
    final MaterialLocalizations localizations = MaterialLocalizations.of(context);

    final Widget actions = Padding(
      padding: EdgeInsetsDirectional.only(
        start: theme.useMaterial3 ? 0 : 4,
        top: (pickerTheme.padding ?? defaultTheme.padding).vertical / 2,
      ),
      child: Row(
        children: <Widget>[
          if (_entryMode.value == TimePickerEntryMode.dial ||
              _entryMode.value == TimePickerEntryMode.input)
            IconButton(
              // In material3 mode, we want to use the color as part of the
              // button style which applies its own opacity. In material2 mode,
              // we want to use the color as the color, which already includes
              // the opacity.
              color: theme.useMaterial3 ? null : entryModeIconColor,
              style:
                  theme.useMaterial3
                      ? IconButton.styleFrom(foregroundColor: entryModeIconColor)
                      : null,
              onPressed: _toggleEntryMode,
              icon:
                  _entryMode.value == TimePickerEntryMode.dial
                      ? widget.switchToInputEntryModeIcon ?? const Icon(Icons.keyboard_outlined)
                      : widget.switchToTimerEntryModeIcon ?? const Icon(Icons.access_time),
              tooltip:
                  _entryMode.value == TimePickerEntryMode.dial
                      ? MaterialLocalizations.of(context).inputTimeModeButtonLabel
                      : MaterialLocalizations.of(context).dialModeButtonLabel,
            ),

Review comment (suggestion):
This is to add a gap between the inputs and the actions, right? Both deriving this spacing from the top padding and having it inflexible feels odd.

What if we added another Flexible widget to act as the spacing? Then it could shrink if needed, but the form section would have priority on space.

And if we used the uncompressed height as a derivative of the theme padding, we should call that out in the time picker theme documentation.

Code after:
            timePickerWidth =
                _kTimePickerInputSize.width - defaultTheme.dayPeriodPortraitSize.width - 12;
          case TimeOfDayFormat.a_space_h_colon_mm:
          case TimeOfDayFormat.h_colon_mm_space_a:
            timePickerWidth = _kTimePickerInputSize.width - (useMaterial3 ? 32 : 0);
        }
        timePickerSize = Size(timePickerWidth, _kTimePickerInputSize.height);
    }
    return Size(timePickerSize.width, timePickerSize.height * textScaleFactor);
  }

  @override
  Widget build(BuildContext context) {
    assert(debugCheckHasMediaQuery(context));
    final ThemeData theme = Theme.of(context);
    final TimePickerThemeData pickerTheme = TimePickerTheme.of(context);
    final _TimePickerDefaults defaultTheme =
        theme.useMaterial3 ? _TimePickerDefaultsM3(context) : _TimePickerDefaultsM2(context);
    final ShapeBorder shape = pickerTheme.shape ?? defaultTheme.shape;
    final Color entryModeIconColor =
        pickerTheme.entryModeIconColor ?? defaultTheme.entryModeIconColor;
    final MaterialLocalizations localizations = MaterialLocalizations.of(context);

    final Widget actions = Padding(
      padding: EdgeInsetsDirectional.only(start: theme.useMaterial3 ? 0 : 4),
      child: Row(
        children: <Widget>[
          if (_entryMode.value == TimePickerEntryMode.dial ||
              _entryMode.value == TimePickerEntryMode.input)
            IconButton(
              // In material3 mode, we want to use the color as part of the
              // button style which applies its own opacity. In material2 mode,
              // we want to use the color as the color, which already includes
              // the opacity.
              color: theme.useMaterial3 ? null : entryModeIconColor,
              style:
                  theme.useMaterial3
                      ? IconButton.styleFrom(foregroundColor: entryModeIconColor)
                      : null,
              onPressed: _toggleEntryMode,
              icon:
                  _entryMode.value == TimePickerEntryMode.dial
                      ? widget.switchToInputEntryModeIcon ?? const Icon(Icons.keyboard_outlined)
                      : widget.switchToTimerEntryModeIcon ?? const Icon(Icons.access_time),
              tooltip:
                  _entryMode.value == TimePickerEntryMode.dial
                      ? MaterialLocalizations.of(context).inputTimeModeButtonLabel
                      : MaterialLocalizations.of(context).dialModeButtonLabel,
            ),
          Expanded(
            child: ConstrainedBox(