Function extendTo

lib/web/CodeMirror/src/edit/mouse_events.js:245–281

(pos)

  let lastPos = start
  function extendTo(pos) {
    if (cmp(lastPos, pos) == 0) return
    lastPos = pos

    if (behavior.unit == "rectangle") {
      let ranges = [], tabSize = cm.options.tabSize
      let startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize)
      let posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize)
      let left = Math.min(startCol, posCol), right = Math.max(startCol, posCol)
      for (let line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
           line <= end; line++) {
        let text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize)
        if (left == right)
          ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos)))
        else if (text.length > leftPos)
          ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize))))
      }
      if (!ranges.length) ranges.push(new Range(start, start))
      setSelection(doc, normalizeSelection(cm, startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),
                   {origin: "*mouse", scroll: false})
      cm.scrollIntoView(pos)
    } else {
      let oldRange = ourRange
      let range = rangeForUnit(cm, pos, behavior.unit)
      let anchor = oldRange.anchor, head
      if (cmp(range.anchor, anchor) > 0) {
        head = range.head
        anchor = minPos(oldRange.from(), range.anchor)
      } else {
        head = range.anchor
        anchor = maxPos(oldRange.to(), range.head)
      }
      let ranges = startSel.ranges.slice(0)
      ranges[ourIndex] = bidiSimplify(cm, new Range(clipPos(doc, anchor), head))
      setSelection(doc, normalizeSelection(cm, ranges, ourIndex), sel_mouse)
    }
  }

  let editorSize = display.wrapper.getBoundingClientRect()
  // Used to ensure timeout re-tries don't fire when another extend