Function prepareMeasureForLine

external/.scrollLibs.js:3657–3680

(cm, line)

  // measurements in a row, can thus ensure that the set-up work is
  // only done once.
  function prepareMeasureForLine(cm, line) {
    var lineN = lineNo(line)
    var view = findViewForLine(cm, lineN)
    if (view && !view.text) {
      view = null
    } else if (view && view.changes) {
      updateLineForChanges(cm, view, lineN, getDimensions(cm))
      cm.curOp.forceUpdate = true
    }
    if (!view) {
      view = updateExternalMeasurement(cm, line)
    }

    var info = mapFromLineView(view, line, lineN)
    return {
      line: line,
      view: view,
      rect: null,
      map: info.map,
      cache: info.cache,
      before: info.before,
      hasHeights: false
    }
  }

  // Given a prepared measurement object, measures the position of an
  // actual character (or fetches it from the cache).