Method reverseSelection

content_scripts/mode_visual.js:112–132

()

  // Swap the anchor node/offset and the focus node/offset. This allows us to work with both ends of
  // the selection, and implements "o" for visual mode.
  reverseSelection() {
    const direction = this.getDirection();
    const element = document.activeElement;
    if (element && DomUtils.isEditable(element) && !element.isContentEditable) {
      // Note(smblott). This implementation is expensive if the selection is large. We only use it
      // here because the normal method (below) does not work within text areas, etc.
      const length = this.selection.toString().length;
      this.collapseSelectionToFocus();
      for (let i = 0, end = length; i < end; i++) {
        this.runMovement(this.opposite[direction], character);
      }
    } else {
      // Normal method.
      const original = this.selection.getRangeAt(0).cloneRange();
      const range = original.cloneRange();
      range.collapse(direction === backward);
      this.setSelectionRange(range);
      const which = direction === forward ? "start" : "end";
      this.selection.extend(original[`${which}Container`], original[`${which}Offset`]);
    }
  }

  // Try to extend the selection by one character in direction. Return positive, negative or 0,
  // indicating whether the selection got bigger, or smaller, or is unchanged.