MWClash/lib/common/measure.dart

import 'package:fl_clash/common/common.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

class Measure {
  final TextScaler _textScaler;
  final BuildContext context;
  final Map<String, dynamic> _measureMap;

  Measure.of(this.context, double textScaleFactor)
    : _measureMap = {},
      _textScaler = TextScaler.linear(textScaleFactor);

  Size computeTextSize(Text text, {double maxWidth = double.infinity}) {
    final textPainter = TextPainter(
      text: TextSpan(text: text.data, style: text.style),
      maxLines: text.maxLines,
      textScaler: _textScaler,
      textDirection: text.textDirection ?? TextDirection.ltr,
    )..layout(maxWidth: maxWidth);
    return textPainter.size;
  }

  double get bodyMediumHeight {
    return _measureMap.updateCacheValue(
      'bodyMediumHeight',
      () => computeTextSize(
        Text('X', style: context.textTheme.bodyMedium),
      ).height,
    );
  }

  double get bodyLargeHeight {
    return _measureMap.updateCacheValue(
      'bodyLargeHeight',
      () =>
          computeTextSize(Text('X', style: context.textTheme.bodyLarge)).height,
    );
  }

  double get bodySmallHeight {
    return _measureMap.updateCacheValue(
      'bodySmallHeight',
      () =>
          computeTextSize(Text('X', style: context.textTheme.bodySmall)).height,
    );
  }

  double get labelSmallHeight {
    return _measureMap.updateCacheValue(
      'labelSmallHeight',
      () => computeTextSize(
        Text('X', style: context.textTheme.labelSmall),
      ).height,
    );
  }

  double get titleSmallHeight {
    return _measureMap.updateCacheValue(
      'titleSmallHeight',
      () => computeTextSize(
        Text('X', style: context.textTheme.titleSmall),
      ).height,
    );
  }

  double get labelMediumHeight {
    return _measureMap.updateCacheValue(
      'labelMediumHeight',
      () => computeTextSize(
        Text('X', style: context.textTheme.labelMedium),
      ).height,
    );
  }

  double get titleLargeHeight {
    return _measureMap.updateCacheValue(
      'titleLargeHeight',
      () => computeTextSize(
        Text('X', style: context.textTheme.titleLarge),
      ).height,
    );
  }

  double get titleMediumHeight {
    return _measureMap.updateCacheValue(
      'titleMediumHeight',
      () => computeTextSize(
        Text('X', style: context.textTheme.titleMedium),
      ).height,
    );
  }
}