Function maybeFindImageMap

javascript/atoms/typescript/is-displayed.ts:212–238

(elem: Element)

  }

  function maybeFindImageMap(elem: Element): ImageMapResult | null {
    var isMap = isElement(elem, 'MAP');
    if (!isMap && !isElement(elem, 'AREA')) {
      return null;
    }

    var map = isMap ? elem : isElement(elem.parentNode, 'MAP') ? elem.parentNode : null;
    var image: Element | null = null;
    var rect = createRect(0, 0, 0, 0);

    if (isElement(map, 'MAP') && (map as HTMLMapElement).name) {
      image = findImageUsingMap((map as HTMLMapElement).name, (map as HTMLMapElement).ownerDocument);
      if (image) {
        rect = getClientRect(image);
        if (!isMap && isElement(elem, 'AREA') && (elem as HTMLAreaElement).shape.toLowerCase() !== 'default') {
          var relativeRect = getAreaRelativeRect(elem as HTMLAreaElement);
          var relativeX = Math.min(Math.max(relativeRect.left, 0), rect.width);
          var relativeY = Math.min(Math.max(relativeRect.top, 0), rect.height);
          var width = Math.min(relativeRect.width, rect.width - relativeX);
          var height = Math.min(relativeRect.height, rect.height - relativeY);
          rect = createRect(relativeX + rect.left, relativeY + rect.top, width, height);
        }
      }
    }

    return { image: image, rect: rect };
  }

  function getClientRegion(elem: Element): Rect {
    return getClientRect(elem);