Function textHeight

mini-code-edit/cm/lib/codemirror.js:1648–1661

()

    var cachedHeight, cachedHeightFor, measureText;
    function textHeight() {
      if (measureText == null) {
        measureText = "<pre>";
        for (var i = 0; i < 49; ++i) measureText += "x<br/>";
        measureText += "x</pre>";
      }
      var offsetHeight = lineDiv.clientHeight;
      if (offsetHeight == cachedHeightFor) return cachedHeight;
      cachedHeightFor = offsetHeight;
      measure.innerHTML = measureText;
      cachedHeight = measure.firstChild.offsetHeight / 50 || 1;
      measure.innerHTML = "";
      return cachedHeight;
    }
    var cachedWidth, cachedWidthFor = 0;
    function charWidth() {
      if (scroller.clientWidth == cachedWidthFor) return cachedWidth;