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 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,
    );
  }
}