ui/src/common/track_utils.ts

// Copyright (C) 2019 The Android Open Source Project
//
// Licensed 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.

export function cropText(str: string, charWidth: number, rectWidth: number) {
  const maxTextWidth = rectWidth - 4;
  let displayText = '';
  const nameLength = str.length * charWidth;
  if (nameLength < maxTextWidth) {
    displayText = str;
  } else {
    // -3 for the 3 ellipsis.
    const displayedChars = Math.floor(maxTextWidth / charWidth) - 3;
    if (displayedChars > 3) {
      displayText = str.substring(0, displayedChars) + '...';
    }
  }
  return displayText;
}