Function leftButtonDown

lib/web/CodeMirror/src/edit/mouse_events.js:129–143

(cm, pos, repeat, event)

}

function leftButtonDown(cm, pos, repeat, event) {
  if (ie) setTimeout(bind(ensureFocus, cm), 0)
  else cm.curOp.focus = activeElt()

  let behavior = configureMouse(cm, repeat, event)

  let sel = cm.doc.sel, contained
  if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
      repeat == "single" && (contained = sel.contains(pos)) > -1 &&
      (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&
      (cmp(contained.to(), pos) > 0 || pos.xRel < 0))
    leftButtonStartDrag(cm, event, pos, behavior)
  else
    leftButtonSelect(cm, event, pos, behavior)
}

// Start a text drag. When it ends, see if any dragging actually
// happen, and treat as a click if it didn't.