baixingwenzheng-pc/node_modules/naive-ui/es/mention/src/utils.mjs

/**
 * The original package is https://www.npmjs.com/package/textarea-caret-ts
 * The original file is https://github.com/TheRealSyler/textarea-caret-position/blob/master/index.ts
 *
 * Here I modified it to make it works when input is scrolled.
 */
import { isBrowser } from "../../_utils/index.mjs";
/**
 * Returns the Absolute (relative to the inner window size) position of the caret in the given element.
 * @param element Input (has to be type='text') or Text Area.
 */
export function getAbsolutePosition(element) {
  const caretRelPost = getRelativePosition(element);
  return {
    left: window.scrollX + element.getBoundingClientRect().left + caretRelPost.left,
    top: window.scrollY + element.getBoundingClientRect().top + caretRelPost.top,
    absolute: true,
    height: caretRelPost.height
  };
}
/**
 * Returns the relative position of the caret in the given element.
 * @param element Input (has to be type='text') or Text Area.
 */
export function getRelativePosition(element, options = {
  debug: false,
  useSelectionEnd: false,
  checkWidthOverflow: true
}) {
  const selectionStart = element.selectionStart !== null ? element.selectionStart : 0;
  const selectionEnd = element.selectionEnd !== null ? element.selectionEnd : 0;
  const position = options.useSelectionEnd ? selectionEnd : selectionStart;
  // We'll copy the properties below into the mirror div.
  // Note that some browsers, such as Firefox, do not concatenate properties
  // into their shorthand (e.g. padding-top, padding-bottom etc. -> padding),
  // so we have to list every single property explicitly.
  const properties = ['direction',
  // RTL support
  'boxSizing', 'width',
  // on Chrome and IE, exclude the scrollbar, so the mirror div wraps exactly as the textarea does
  'height', 'overflowX', 'overflowY',
  // copy the scrollbar for IE
  'borderTopWidth', 'borderRightWidth', 'borderBottomWidth', 'borderLeftWidth', 'borderStyle', 'paddingTop', 'paddingRight', 'paddingBottom', 'paddingLeft',
  // https://developer.mozilla.org/en-US/docs/Web/CSS/font
  'fontStyle', 'fontVariant', 'fontWeight', 'fontStretch', 'fontSize', 'fontSizeAdjust', 'lineHeight', 'fontFamily', 'textAlign', 'textTransform', 'textIndent', 'textDecoration',
  // might not make a difference, but better be safe
  'letterSpacing', 'wordSpacing', 'tabSize', 'MozTabSize'];
  // Firefox 1.0+
  const isFirefox = navigator.userAgent.toLowerCase().includes('firefox');
  if (!isBrowser) {
    throw new Error('textarea-caret-position#getCaretPosition should only be called in a browser');
  }
  const debug = options === null || options === void 0 ? void 0 : options.debug;
  if (debug) {
    const el = document.querySelector('#input-textarea-caret-position-mirror-div');
    if (el === null || el === void 0 ? void 0 : el.parentNode) el.parentNode.removeChild(el);
  }
  // The mirror div will replicate the textareas style
  const div = document.createElement('div');
  div.id = 'input-textarea-caret-position-mirror-div';
  document.body.appendChild(div);
  const style = div.style;
  const computed = window.getComputedStyle ? window.getComputedStyle(element) : element.currentStyle; // currentStyle for IE < 9
  const isInput = element.nodeName === 'INPUT';
  // Default textarea styles
  style.whiteSpace = isInput ? 'nowrap' : 'pre-wrap';
  if (!isInput) style.wordWrap = 'break-word'; // only for textarea-s
  // Position off-screen
  style.position = 'absolute'; // required to return coordinates properly
  if (!debug) style.visibility = 'hidden'; // not 'display: none' because we want rendering
  // Transfer the element's properties to the div
  properties.forEach(prop => {
    if (isInput && prop === 'lineHeight') {
      // Special case for <input>s because text is rendered centered and line height may be != height
      if (computed.boxSizing === 'border-box') {
        const height = Number.parseInt(computed.height);
        const outerHeight = Number.parseInt(computed.paddingTop) + Number.parseInt(computed.paddingBottom) + Number.parseInt(computed.borderTopWidth) + Number.parseInt(computed.borderBottomWidth);
        const targetHeight = outerHeight + Number.parseInt(computed.lineHeight);
        if (height > targetHeight) {
          style.lineHeight = `${height - outerHeight}px`;
        } else if (height === targetHeight) {
          style.lineHeight = computed.lineHeight;
        } else {
          style.lineHeight = '0';
        }
      } else {
        style.lineHeight = computed.height;
      }
    } else {
      style[prop] = computed[prop];
    }
  });
  if (isFirefox) {
    // Firefox lies about the overflow property for textareas: https://bugzilla.mozilla.org/show_bug.cgi?id=984275
    if (element.scrollHeight > Number.parseInt(computed.height)) {
      style.overflowY = 'scroll';
    }
  } else {
    style.overflow = 'hidden'; // for Chrome to not render a scrollbar; IE keeps overflowY = 'scroll'
  }
  div.textContent = element.value.substring(0, position);
  // The second special handling for input type="text" vs textarea:
  // spaces need to be replaced with non-breaking spaces - http://stackoverflow.com/a/13402035/1269037
  if (isInput && div.textContent) {
    div.textContent = div.textContent.replace(/\s/g, '\u00A0');
  }
  const span = document.createElement('span');
  // Wrapping must be replicated *exactly*, including when a long word gets
  // onto the next line, with whitespace at the end of the line before (#7).
  // The  *only* reliable way to do that is to copy the *entire* rest of the
  // textareas content into the <span> created at the caret position.
  // For inputs, just '.' would be enough, but no need to bother.
  span.textContent = element.value.substring(position) || '.'; // || because a completely empty faux span doesn't render at all
  span.style.position = 'relative';
  span.style.left = `${-element.scrollLeft}px`;
  span.style.top = `${-element.scrollTop}px`;
  div.appendChild(span);
  const relativePosition = {
    top: span.offsetTop + Number.parseInt(computed.borderTopWidth),
    left: span.offsetLeft + Number.parseInt(computed.borderLeftWidth),
    absolute: false,
    // We don't use line-height since it may be too large for position. Eg. 34px
    // for input
    height: Number.parseInt(computed.fontSize) * 1.5
  };
  if (debug) {
    span.style.backgroundColor = '#aaa';
  } else {
    document.body.removeChild(div);
  }
  if (relativePosition.left >= element.clientWidth && options.checkWidthOverflow) {
    relativePosition.left = element.clientWidth;
  }
  return relativePosition;
}
/**
 * sets the top and left css style of the element based on the absolute position of the caretElements caret,
 * @param offset offsets the position.
 * @param detectBoundary offsets the position if the position would be outside the window.
 * @param returnOnly if true the element position wont be set.
 */
export function setElementPositionBasedOnCaret(element, caretElement, offset = {
  top: 0,
  left: 0
}, margin = 2, detectBoundary = true, returnOnly = false) {
  const pos = getAbsolutePosition(caretElement);
  if (detectBoundary) {
    pos.left = pos.left + (element.clientWidth + margin) + offset.left > window.scrollX + window.innerWidth ? pos.left = window.scrollX + window.innerWidth - (element.clientWidth + margin) : pos.left += offset.left;
    pos.top = pos.top + (element.clientWidth + margin) + offset.top > window.scrollY + window.innerHeight ? pos.top -= element.clientWidth + margin : pos.top += offset.top;
  } else {
    pos.top += offset.top;
    pos.left += offset.left;
  }
  if (!returnOnly) {
    element.style.top = `${pos.top}px`;
    element.style.left = `${pos.left}px`;
  }
  return pos;
}