@superset-ui/core/esm/dimension/computeMaxFontSize.js

Superset UI core

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import getTextDimension from './getTextDimension';


function decreaseSizeUntil(
startSize,
computeDimension,
condition)
{
  let size = startSize;
  let dimension = computeDimension(size);

  while (!condition(dimension)) {
    size -= 1;

    // Here if the size goes below zero most likely is because it
    // has additional style applied in which case we assume the user
    // knows what it's doing and we just let them use that.
    // Visually it works, although it could have another
    // check in place.
    if (size < 0) {
      size = startSize;
      break;
    }

    dimension = computeDimension(size);
  }

  return size;
}

export default function computeMaxFontSize(
input)




{
  const { idealFontSize, maxWidth, maxHeight, style, ...rest } = input;

  let size;
  if (idealFontSize !== undefined && idealFontSize !== null) {
    size = idealFontSize;
  } else if (maxHeight === undefined || maxHeight === null) {
    throw new Error(
      'You must specify at least one of maxHeight or idealFontSize'
    );
  } else {
    size = Math.floor(maxHeight);
  }

  function computeDimension(fontSize) {
    return getTextDimension({
      ...rest,
      style: { ...style, fontSize: `${fontSize}px` }
    });
  }

  if (maxWidth !== undefined && maxWidth !== null) {
    size = decreaseSizeUntil(
      size,
      computeDimension,
      (dim) => dim.width > 0 && dim.width <= maxWidth
    );
  }

  if (maxHeight !== undefined && maxHeight !== null) {
    size = decreaseSizeUntil(
      size,
      computeDimension,
      (dim) => dim.height > 0 && dim.height <= maxHeight
    );
  }

  return size;
}
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