General.Web/wwwroot/lib/codemirror-5.31.0/src/edit/drop_events.js

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

import { drawSelectionCursor } from "../display/selection"
import { operation } from "../display/operations"
import { clipPos } from "../line/pos"
import { posFromMouse } from "../measurement/position_measurement"
import { eventInWidget } from "../measurement/widgets"
import { makeChange, replaceRange } from "../model/changes"
import { changeEnd } from "../model/change_measurement"
import { simpleSelection } from "../model/selection"
import { setSelectionNoUndo, setSelectionReplaceHistory } from "../model/selection_updates"
import { ie, presto, safari } from "../util/browser"
import { elt, removeChildrenAndAdd } from "../util/dom"
import { e_preventDefault, e_stop, signalDOMEvent } from "../util/event"
import { indexOf } from "../util/misc"

// Kludge to work around strange IE behavior where it'll sometimes
// re-fire a series of drag-related events right after the drop (#1551)
let lastDrop = 0

export function onDrop(e) {
  let cm = this
  clearDragCursor(cm)
  if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))
    return
  e_preventDefault(e)
  if (ie) lastDrop = +new Date
  let pos = posFromMouse(cm, e, true), files = e.dataTransfer.files
  if (!pos || cm.isReadOnly()) return
  // Might be a file drop, in which case we simply extract the text
  // and insert it.
  if (files && files.length && window.FileReader && window.File) {
    let n = files.length, text = Array(n), read = 0
    let loadFile = (file, i) => {
      if (cm.options.allowDropFileTypes &&
          indexOf(cm.options.allowDropFileTypes, file.type) == -1)
        return

      let reader = new FileReader
      reader.onload = operation(cm, () => {
        let content = reader.result
        if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) content = ""
        text[i] = content
        if (++read == n) {
          pos = clipPos(cm.doc, pos)
          let change = {from: pos, to: pos,
                        text: cm.doc.splitLines(text.join(cm.doc.lineSeparator())),
                        origin: "paste"}
          makeChange(cm.doc, change)
          setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)))
        }
      })
      reader.readAsText(file)
    }
    for (let i = 0; i < n; ++i) loadFile(files[i], i)
  } else { // Normal drop
    // Don't do a replace if the drop happened inside of the selected text.
    if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
      cm.state.draggingText(e)
      // Ensure the editor is re-focused
      setTimeout(() => cm.display.input.focus(), 20)
      return