tor-browser

input.ts (32888B)

---

import {Selection, NodeSelection, TextSelection} from "prosemirror-state"
import {dropPoint} from "prosemirror-transform"
import {Slice, Node} from "prosemirror-model"

import * as browser from "./browser"
import {captureKeyDown} from "./capturekeys"
import {parseFromClipboard, serializeForClipboard} from "./clipboard"
import {selectionBetween, selectionToDOM, selectionFromDOM} from "./selection"
import {keyEvent, DOMNode, textNodeBefore, textNodeAfter} from "./dom"
import {EditorView} from "./index"
import {ViewDesc} from "./viewdesc"

// A collection of DOM events that occur within the editor, and callback functions
// to invoke when the event fires.
const handlers: {[event: string]: (view: EditorView, event: Event) => void} = {}
const editHandlers: {[event: string]: (view: EditorView, event: Event) => void} = {}
const passiveHandlers: Record<string, boolean> = {touchstart: true, touchmove: true}

export class InputState {
 shiftKey = false
 mouseDown: MouseDown | null = null
 lastKeyCode: number | null = null
 lastKeyCodeTime = 0
 lastClick = {time: 0, x: 0, y: 0, type: "", button: 0}
 lastSelectionOrigin: string | null = null
 lastSelectionTime = 0
 lastIOSEnter = 0
 lastIOSEnterFallbackTimeout = -1
 lastFocus = 0
 lastTouch = 0
 lastChromeDelete = 0
 composing = false
 compositionNode: Text | null = null
 composingTimeout = -1
 compositionNodes: ViewDesc[] = []
 compositionEndedAt = -2e8
 compositionID = 1
 // Set to a composition ID when there are pending changes at compositionend
 compositionPendingChanges = 0
 domChangeCount = 0
 eventHandlers: {[event: string]: (event: Event) => void} = Object.create(null)
 hideSelectionGuard: (() => void) | null = null
}

export function initInput(view: EditorView) {
 for (let event in handlers) {
   let handler = handlers[event]
   view.dom.addEventListener(event, view.input.eventHandlers[event] = (event: Event) => {
     if (eventBelongsToView(view, event) && !runCustomHandler(view, event) &&
         (view.editable || !(event.type in editHandlers)))
       handler(view, event)
   }, passiveHandlers[event] ? {passive: true} : undefined)
 }
 // On Safari, for reasons beyond my understanding, adding an input
 // event handler makes an issue where the composition vanishes when
 // you press enter go away.
 if (browser.safari) view.dom.addEventListener("input", () => null)

 ensureListeners(view)
}

function setSelectionOrigin(view: EditorView, origin: string) {
 view.input.lastSelectionOrigin = origin
 view.input.lastSelectionTime = Date.now()
}

export function destroyInput(view: EditorView) {
 view.domObserver.stop()
 for (let type in view.input.eventHandlers)
   view.dom.removeEventListener(type, view.input.eventHandlers[type])
 clearTimeout(view.input.composingTimeout)
 clearTimeout(view.input.lastIOSEnterFallbackTimeout)
}

export function ensureListeners(view: EditorView) {
 view.someProp("handleDOMEvents", currentHandlers => {
   for (let type in currentHandlers) if (!view.input.eventHandlers[type])
     view.dom.addEventListener(type, view.input.eventHandlers[type] = event => runCustomHandler(view, event))
 })
}

function runCustomHandler(view: EditorView, event: Event) {
 return view.someProp("handleDOMEvents", handlers => {
   let handler = handlers[event.type]
   return handler ? handler(view, event) || event.defaultPrevented : false
 })
}

function eventBelongsToView(view: EditorView, event: Event) {
 if (!event.bubbles) return true
 if (event.defaultPrevented) return false
 for (let node = event.target as DOMNode; node != view.dom; node = node.parentNode!)
   if (!node || node.nodeType == 11 ||
       (node.pmViewDesc && node.pmViewDesc.stopEvent(event)))
     return false
 return true
}

export function dispatchEvent(view: EditorView, event: Event) {
 if (!runCustomHandler(view, event) && handlers[event.type] &&
     (view.editable || !(event.type in editHandlers)))
   handlers[event.type](view, event)
}

editHandlers.keydown = (view: EditorView, _event: Event) => {
 let event = _event as KeyboardEvent
 view.input.shiftKey = event.keyCode == 16 || event.shiftKey
 if (inOrNearComposition(view, event)) return
 view.input.lastKeyCode = event.keyCode
 view.input.lastKeyCodeTime = Date.now()
 // Suppress enter key events on Chrome Android, because those tend
 // to be part of a confused sequence of composition events fired,
 // and handling them eagerly tends to corrupt the input.
 if (browser.android && browser.chrome && event.keyCode == 13) return
 if (event.keyCode != 229) view.domObserver.forceFlush()

 // On iOS, if we preventDefault enter key presses, the virtual
 // keyboard gets confused. So the hack here is to set a flag that
 // makes the DOM change code recognize that what just happens should
 // be replaced by whatever the Enter key handlers do.
 if (browser.ios && event.keyCode == 13 && !event.ctrlKey && !event.altKey && !event.metaKey) {
   let now = Date.now()
   view.input.lastIOSEnter = now
   view.input.lastIOSEnterFallbackTimeout = setTimeout(() => {
     if (view.input.lastIOSEnter == now) {
       view.someProp("handleKeyDown", f => f(view, keyEvent(13, "Enter")))
       view.input.lastIOSEnter = 0
     }
   }, 200)
 } else if (view.someProp("handleKeyDown", f => f(view, event)) || captureKeyDown(view, event)) {
   event.preventDefault()
 } else {
   setSelectionOrigin(view, "key")
 }
}

editHandlers.keyup = (view, event) => {
 if ((event as KeyboardEvent).keyCode == 16) view.input.shiftKey = false
}

editHandlers.keypress = (view, _event) => {
 let event = _event as KeyboardEvent
 if (inOrNearComposition(view, event) || !event.charCode ||
     event.ctrlKey && !event.altKey || browser.mac && event.metaKey) return

 if (view.someProp("handleKeyPress", f => f(view, event))) {
   event.preventDefault()
   return
 }

 let sel = view.state.selection
 if (!(sel instanceof TextSelection) || !sel.$from.sameParent(sel.$to)) {
   let text = String.fromCharCode(event.charCode)
   let deflt = () => view.state.tr.insertText(text).scrollIntoView()
   if (!/[\r\n]/.test(text) && !view.someProp("handleTextInput", f => f(view, sel.$from.pos, sel.$to.pos, text, deflt)))
     view.dispatch(deflt())
   event.preventDefault()
 }
}

function eventCoords(event: MouseEvent) { return {left: event.clientX, top: event.clientY} }

function isNear(event: MouseEvent, click: {x: number, y: number}) {
 let dx = click.x - event.clientX, dy = click.y - event.clientY
 return dx * dx + dy * dy < 100
}

function runHandlerOnContext(
 view: EditorView,
 propName: "handleClickOn" | "handleDoubleClickOn" | "handleTripleClickOn",
 pos: number,
 inside: number,
 event: MouseEvent
) {
 if (inside == -1) return false
 let $pos = view.state.doc.resolve(inside)
 for (let i = $pos.depth + 1; i > 0; i--) {
   if (view.someProp(propName, f => i > $pos.depth ? f(view, pos, $pos.nodeAfter!, $pos.before(i), event, true)
                                                   : f(view, pos, $pos.node(i), $pos.before(i), event, false)))
     return true
 }
 return false
}

function updateSelection(view: EditorView, selection: Selection, origin: string) {
 if (!view.focused) view.focus()
 if (view.state.selection.eq(selection)) return
 let tr = view.state.tr.setSelection(selection)
 if (origin == "pointer") tr.setMeta("pointer", true)
 view.dispatch(tr)
}

function selectClickedLeaf(view: EditorView, inside: number) {
 if (inside == -1) return false
 let $pos = view.state.doc.resolve(inside), node = $pos.nodeAfter
 if (node && node.isAtom && NodeSelection.isSelectable(node)) {
   updateSelection(view, new NodeSelection($pos), "pointer")
   return true
 }
 return false
}

function selectClickedNode(view: EditorView, inside: number) {
 if (inside == -1) return false
 let sel = view.state.selection, selectedNode, selectAt
 if (sel instanceof NodeSelection) selectedNode = sel.node

 let $pos = view.state.doc.resolve(inside)
 for (let i = $pos.depth + 1; i > 0; i--) {
   let node = i > $pos.depth ? $pos.nodeAfter! : $pos.node(i)
   if (NodeSelection.isSelectable(node)) {
     if (selectedNode && sel.$from.depth > 0 &&
         i >= sel.$from.depth && $pos.before(sel.$from.depth + 1) == sel.$from.pos)
       selectAt = $pos.before(sel.$from.depth)
     else
       selectAt = $pos.before(i)
     break
   }
 }

 if (selectAt != null) {
   updateSelection(view, NodeSelection.create(view.state.doc, selectAt), "pointer")
   return true
 } else {
   return false
 }
}

function handleSingleClick(view: EditorView, pos: number, inside: number, event: MouseEvent, selectNode: boolean) {
 return runHandlerOnContext(view, "handleClickOn", pos, inside, event) ||
   view.someProp("handleClick", f => f(view, pos, event)) ||
   (selectNode ? selectClickedNode(view, inside) : selectClickedLeaf(view, inside))
}

function handleDoubleClick(view: EditorView, pos: number, inside: number, event: MouseEvent) {
 return runHandlerOnContext(view, "handleDoubleClickOn", pos, inside, event) ||
   view.someProp("handleDoubleClick", f => f(view, pos, event))
}

function handleTripleClick(view: EditorView, pos: number, inside: number, event: MouseEvent) {
 return runHandlerOnContext(view, "handleTripleClickOn", pos, inside, event) ||
   view.someProp("handleTripleClick", f => f(view, pos, event)) ||
   defaultTripleClick(view, inside, event)
}

function defaultTripleClick(view: EditorView, inside: number, event: MouseEvent) {
 if (event.button != 0) return false
 let doc = view.state.doc
 if (inside == -1) {
   if (doc.inlineContent) {
     updateSelection(view, TextSelection.create(doc, 0, doc.content.size), "pointer")
     return true
   }
   return false
 }

 let $pos = doc.resolve(inside)
 for (let i = $pos.depth + 1; i > 0; i--) {
   let node = i > $pos.depth ? $pos.nodeAfter! : $pos.node(i)
   let nodePos = $pos.before(i)
   if (node.inlineContent)
     updateSelection(view, TextSelection.create(doc, nodePos + 1, nodePos + 1 + node.content.size), "pointer")
   else if (NodeSelection.isSelectable(node))
     updateSelection(view, NodeSelection.create(doc, nodePos), "pointer")
   else
     continue
   return true
 }
}

function forceDOMFlush(view: EditorView) {
 return endComposition(view)
}

const selectNodeModifier: keyof MouseEvent = browser.mac ? "metaKey" : "ctrlKey"

handlers.mousedown = (view, _event) => {
 let event = _event as MouseEvent
 view.input.shiftKey = event.shiftKey
 let flushed = forceDOMFlush(view)
 let now = Date.now(), type = "singleClick"
 if (now - view.input.lastClick.time < 500 && isNear(event, view.input.lastClick) && !event[selectNodeModifier] &&
     view.input.lastClick.button == event.button) {
   if (view.input.lastClick.type == "singleClick") type = "doubleClick"
   else if (view.input.lastClick.type == "doubleClick") type = "tripleClick"
 }
 view.input.lastClick = {time: now, x: event.clientX, y: event.clientY, type, button: event.button}

 let pos = view.posAtCoords(eventCoords(event))
 if (!pos) return

 if (type == "singleClick") {
   if (view.input.mouseDown) view.input.mouseDown.done()
   view.input.mouseDown = new MouseDown(view, pos, event, !!flushed)
 } else if ((type == "doubleClick" ? handleDoubleClick : handleTripleClick)(view, pos.pos, pos.inside, event)) {
   event.preventDefault()
 } else {
   setSelectionOrigin(view, "pointer")
 }
}

class MouseDown {
 startDoc: Node
 selectNode: boolean
 allowDefault: boolean
 delayedSelectionSync = false
 mightDrag: {node: Node, pos: number, addAttr: boolean, setUneditable: boolean} | null = null
 target: HTMLElement | null

 constructor(
   readonly view: EditorView,
   readonly pos: {pos: number, inside: number},
   readonly event: MouseEvent,
   readonly flushed: boolean
 ) {
   this.startDoc = view.state.doc
   this.selectNode = !!event[selectNodeModifier]
   this.allowDefault = event.shiftKey

   let targetNode: Node, targetPos
   if (pos.inside > -1) {
     targetNode = view.state.doc.nodeAt(pos.inside)!
     targetPos = pos.inside
   } else {
     let $pos = view.state.doc.resolve(pos.pos)
     targetNode = $pos.parent
     targetPos = $pos.depth ? $pos.before() : 0
   }

   const target = flushed ? null : event.target as HTMLElement
   const targetDesc = target ? view.docView.nearestDesc(target, true) : null
   this.target = targetDesc && targetDesc.nodeDOM.nodeType == 1 ? targetDesc.nodeDOM as HTMLElement : null

   let {selection} = view.state
   if (event.button == 0 &&
       targetNode.type.spec.draggable && targetNode.type.spec.selectable !== false ||
       selection instanceof NodeSelection && selection.from <= targetPos && selection.to > targetPos)
     this.mightDrag = {
       node: targetNode,
       pos: targetPos,
       addAttr: !!(this.target && !this.target.draggable),
       setUneditable: !!(this.target && browser.gecko && !this.target.hasAttribute("contentEditable"))
     }

   if (this.target && this.mightDrag && (this.mightDrag.addAttr || this.mightDrag.setUneditable)) {
     this.view.domObserver.stop()
     if (this.mightDrag.addAttr) this.target.draggable = true
     if (this.mightDrag.setUneditable)
       setTimeout(() => {
         if (this.view.input.mouseDown == this) this.target!.setAttribute("contentEditable", "false")
       }, 20)
     this.view.domObserver.start()
   }

   view.root.addEventListener("mouseup", this.up = this.up.bind(this) as any)
   view.root.addEventListener("mousemove", this.move = this.move.bind(this) as any)
   setSelectionOrigin(view, "pointer")
 }

 done() {
   this.view.root.removeEventListener("mouseup", this.up as any)
   this.view.root.removeEventListener("mousemove", this.move as any)
   if (this.mightDrag && this.target) {
     this.view.domObserver.stop()
     if (this.mightDrag.addAttr) this.target.removeAttribute("draggable")
     if (this.mightDrag.setUneditable) this.target.removeAttribute("contentEditable")
     this.view.domObserver.start()
   }
   if (this.delayedSelectionSync) setTimeout(() => selectionToDOM(this.view))
   this.view.input.mouseDown = null
 }

 up(event: MouseEvent) {
   this.done()

   if (!this.view.dom.contains(event.target as HTMLElement))
     return

   let pos: {pos: number, inside: number} | null = this.pos
   if (this.view.state.doc != this.startDoc) pos = this.view.posAtCoords(eventCoords(event))

   this.updateAllowDefault(event)
   if (this.allowDefault || !pos) {
     setSelectionOrigin(this.view, "pointer")
   } else if (handleSingleClick(this.view, pos.pos, pos.inside, event, this.selectNode)) {
     event.preventDefault()
   } else if (event.button == 0 &&
              (this.flushed ||
               // Safari ignores clicks on draggable elements
               (browser.safari && this.mightDrag && !this.mightDrag.node.isAtom) ||
               // Chrome will sometimes treat a node selection as a
               // cursor, but still report that the node is selected
               // when asked through getSelection. You'll then get a
               // situation where clicking at the point where that
               // (hidden) cursor is doesn't change the selection, and
               // thus doesn't get a reaction from ProseMirror. This
               // works around that.
               (browser.chrome && !this.view.state.selection.visible &&
                Math.min(Math.abs(pos.pos - this.view.state.selection.from),
                         Math.abs(pos.pos - this.view.state.selection.to)) <= 2))) {
     updateSelection(this.view, Selection.near(this.view.state.doc.resolve(pos.pos)), "pointer")
     event.preventDefault()
   } else {
     setSelectionOrigin(this.view, "pointer")
   }
 }

 move(event: MouseEvent) {
   this.updateAllowDefault(event)
   setSelectionOrigin(this.view, "pointer")
   if (event.buttons == 0) this.done()
 }

 updateAllowDefault(event: MouseEvent) {
   if (!this.allowDefault && (Math.abs(this.event.x - event.clientX) > 4 ||
       Math.abs(this.event.y - event.clientY) > 4))
     this.allowDefault = true
 }
}

handlers.touchstart = view => {
 view.input.lastTouch = Date.now()
 forceDOMFlush(view)
 setSelectionOrigin(view, "pointer")
}

handlers.touchmove = view => {
 view.input.lastTouch = Date.now()
 setSelectionOrigin(view, "pointer")
}

handlers.contextmenu = view => forceDOMFlush(view)

function inOrNearComposition(view: EditorView, event: Event) {
 if (view.composing) return true
 // See https://www.stum.de/2016/06/24/handling-ime-events-in-javascript/.
 // On Japanese input method editors (IMEs), the Enter key is used to confirm character
 // selection. On Safari, when Enter is pressed, compositionend and keydown events are
 // emitted. The keydown event triggers newline insertion, which we don't want.
 // This method returns true if the keydown event should be ignored.
 // We only ignore it once, as pressing Enter a second time *should* insert a newline.
 // Furthermore, the keydown event timestamp must be close to the compositionEndedAt timestamp.
 // This guards against the case where compositionend is triggered without the keyboard
 // (e.g. character confirmation may be done with the mouse), and keydown is triggered
 // afterwards- we wouldn't want to ignore the keydown event in this case.
 if (browser.safari && Math.abs(event.timeStamp - view.input.compositionEndedAt) < 500) {
   view.input.compositionEndedAt = -2e8
   return true
 }
 return false
}

// Drop active composition after 5 seconds of inactivity on Android
const timeoutComposition = browser.android ? 5000 : -1

editHandlers.compositionstart = editHandlers.compositionupdate = view => {
 if (!view.composing) {
   view.domObserver.flush()
   let {state} = view, $pos = state.selection.$to
   if (state.selection instanceof TextSelection &&
       (state.storedMarks ||
        (!$pos.textOffset && $pos.parentOffset && $pos.nodeBefore!.marks.some(m => m.type.spec.inclusive === false)) ||
        browser.chrome && browser.windows && selectionBeforeUneditable(view))) { // Issue #1500
     // Need to wrap the cursor in mark nodes different from the ones in the DOM context
     view.markCursor = view.state.storedMarks || $pos.marks()
     endComposition(view, true)
     view.markCursor = null
   } else {
     endComposition(view, !state.selection.empty)
     // In firefox, if the cursor is after but outside a marked node,
     // the inserted text won't inherit the marks. So this moves it
     // inside if necessary.
     if (browser.gecko && state.selection.empty && $pos.parentOffset && !$pos.textOffset && $pos.nodeBefore!.marks.length) {
       let sel = view.domSelectionRange()
       for (let node = sel.focusNode, offset = sel.focusOffset; node && node.nodeType == 1 && offset != 0;) {
         let before = offset < 0 ? node.lastChild : node.childNodes[offset - 1]
         if (!before) break
         if (before.nodeType == 3) {
           let sel = view.domSelection()
           if (sel) sel.collapse(before, before.nodeValue!.length)
           break
         } else {
           node = before
           offset = -1
         }
       }
     }
   }
   view.input.composing = true
 }
 scheduleComposeEnd(view, timeoutComposition)
}

function selectionBeforeUneditable(view: EditorView) {
 let {focusNode, focusOffset} = view.domSelectionRange()
 if (!focusNode || focusNode.nodeType != 1 || focusOffset >= focusNode.childNodes.length) return false
 let next = focusNode.childNodes[focusOffset]
 return next.nodeType == 1 && (next as HTMLElement).contentEditable == "false"
}

editHandlers.compositionend = (view, event) => {
 if (view.composing) {
   view.input.composing = false
   view.input.compositionEndedAt = event.timeStamp
   view.input.compositionPendingChanges = view.domObserver.pendingRecords().length ? view.input.compositionID : 0
   view.input.compositionNode = null
   if (view.input.compositionPendingChanges) Promise.resolve().then(() => view.domObserver.flush())
   view.input.compositionID++
   scheduleComposeEnd(view, 20)
 }
}

function scheduleComposeEnd(view: EditorView, delay: number) {
 clearTimeout(view.input.composingTimeout)
 if (delay > -1) view.input.composingTimeout = setTimeout(() => endComposition(view), delay)
}

export function clearComposition(view: EditorView) {
 if (view.composing) {
   view.input.composing = false
   view.input.compositionEndedAt = timestampFromCustomEvent()
 }
 while (view.input.compositionNodes.length > 0) view.input.compositionNodes.pop()!.markParentsDirty()
}

export function findCompositionNode(view: EditorView) {
 let sel = view.domSelectionRange()
 if (!sel.focusNode) return null
 let textBefore = textNodeBefore(sel.focusNode, sel.focusOffset)
 let textAfter = textNodeAfter(sel.focusNode, sel.focusOffset)
 if (textBefore && textAfter && textBefore != textAfter) {
   let descAfter = textAfter.pmViewDesc, lastChanged = view.domObserver.lastChangedTextNode
   if (textBefore == lastChanged || textAfter == lastChanged) return lastChanged
   if (!descAfter || !descAfter.isText(textAfter.nodeValue!)) {
     return textAfter
   } else if (view.input.compositionNode == textAfter) {
     let descBefore = textBefore.pmViewDesc
     if (!(!descBefore || !descBefore.isText(textBefore.nodeValue!)))
       return textAfter
   }
 }
 return textBefore || textAfter
}

function timestampFromCustomEvent() {
 let event = document.createEvent("Event")
 event.initEvent("event", true, true)
 return event.timeStamp
}

/// @internal
export function endComposition(view: EditorView, restarting = false) {
 if (browser.android && view.domObserver.flushingSoon >= 0) return
 view.domObserver.forceFlush()
 clearComposition(view)
 if (restarting || view.docView && view.docView.dirty) {
   let sel = selectionFromDOM(view), cur = view.state.selection
   if (sel && !sel.eq(cur)) view.dispatch(view.state.tr.setSelection(sel))
   else if ((view.markCursor || restarting) && !cur.$from.node(cur.$from.sharedDepth(cur.to)).inlineContent) view.dispatch(view.state.tr.deleteSelection())
   else view.updateState(view.state)
   return true
 }
 return false
}

function captureCopy(view: EditorView, dom: HTMLElement) {
 // The extra wrapper is somehow necessary on IE/Edge to prevent the
 // content from being mangled when it is put onto the clipboard
 if (!view.dom.parentNode) return
 let wrap = view.dom.parentNode.appendChild(document.createElement("div"))
 wrap.appendChild(dom)
 wrap.style.cssText = "position: fixed; left: -10000px; top: 10px"
 let sel = getSelection()!, range = document.createRange()
 range.selectNodeContents(dom)
 // Done because IE will fire a selectionchange moving the selection
 // to its start when removeAllRanges is called and the editor still
 // has focus (which will mess up the editor's selection state).
 view.dom.blur()
 sel.removeAllRanges()
 sel.addRange(range)
 setTimeout(() => {
   if (wrap.parentNode) wrap.parentNode.removeChild(wrap)
   view.focus()
 }, 50)
}

// This is very crude, but unfortunately both these browsers _pretend_
// that they have a clipboard API—all the objects and methods are
// there, they just don't work, and they are hard to test.
const brokenClipboardAPI = (browser.ie && browser.ie_version < 15) ||
     (browser.ios && browser.webkit_version < 604)

handlers.copy = editHandlers.cut = (view, _event) => {
 let event = _event as ClipboardEvent
 let sel = view.state.selection, cut = event.type == "cut"
 if (sel.empty) return

 // IE and Edge's clipboard interface is completely broken
 let data = brokenClipboardAPI ? null : event.clipboardData
 let slice = sel.content(), {dom, text} = serializeForClipboard(view, slice)
 if (data) {
   event.preventDefault()
   data.clearData()
   data.setData("text/html", dom.innerHTML)
   data.setData("text/plain", text)
 } else {
   captureCopy(view, dom)
 }
 if (cut) view.dispatch(view.state.tr.deleteSelection().scrollIntoView().setMeta("uiEvent", "cut"))
}

function sliceSingleNode(slice: Slice) {
 return slice.openStart == 0 && slice.openEnd == 0 && slice.content.childCount == 1 ? slice.content.firstChild : null
}

function capturePaste(view: EditorView, event: ClipboardEvent) {
 if (!view.dom.parentNode) return
 let plainText = view.input.shiftKey || view.state.selection.$from.parent.type.spec.code
 let target = view.dom.parentNode.appendChild(document.createElement(plainText ? "textarea" : "div"))
 if (!plainText) target.contentEditable = "true"
 target.style.cssText = "position: fixed; left: -10000px; top: 10px"
 target.focus()
 let plain = view.input.shiftKey && view.input.lastKeyCode != 45
 setTimeout(() => {
   view.focus()
   if (target.parentNode) target.parentNode.removeChild(target)
   if (plainText) doPaste(view, (target as HTMLTextAreaElement).value, null, plain, event)
   else doPaste(view, target.textContent!, target.innerHTML, plain, event)
 }, 50)
}

export function doPaste(view: EditorView, text: string, html: string | null, preferPlain: boolean, event: ClipboardEvent) {
 let slice = parseFromClipboard(view, text, html, preferPlain, view.state.selection.$from)
 if (view.someProp("handlePaste", f => f(view, event, slice || Slice.empty))) return true
 if (!slice) return false

 let singleNode = sliceSingleNode(slice)
 let tr = singleNode
   ? view.state.tr.replaceSelectionWith(singleNode, preferPlain)
   : view.state.tr.replaceSelection(slice)
 view.dispatch(tr.scrollIntoView().setMeta("paste", true).setMeta("uiEvent", "paste"))
 return true
}

function getText(clipboardData: DataTransfer) {
 let text = clipboardData.getData("text/plain") || clipboardData.getData("Text")
 if (text) return text
 let uris = clipboardData.getData("text/uri-list")
 return uris ? uris.replace(/\r?\n/g, " ") : ""
}

editHandlers.paste = (view, _event) => {
 let event = _event as ClipboardEvent
 // Handling paste from JavaScript during composition is very poorly
 // handled by browsers, so as a dodgy but preferable kludge, we just
 // let the browser do its native thing there, except on Android,
 // where the editor is almost always composing.
 if (view.composing && !browser.android) return
 let data = brokenClipboardAPI ? null : event.clipboardData
 let plain = view.input.shiftKey && view.input.lastKeyCode != 45
 if (data && doPaste(view, getText(data), data.getData("text/html"), plain, event))
   event.preventDefault()
 else
   capturePaste(view, event)
}

export class Dragging {
 constructor(readonly slice: Slice, readonly move: boolean, readonly node?: NodeSelection) {}
}

const dragCopyModifier: keyof DragEvent = browser.mac ? "altKey" : "ctrlKey"

function dragMoves(view: EditorView, event: DragEvent) {
 let moves = view.someProp("dragCopies", test => !test(event))
 return moves != null ? moves : !event[dragCopyModifier]
}

handlers.dragstart = (view, _event) => {
 let event = _event as DragEvent
 let mouseDown = view.input.mouseDown
 if (mouseDown) mouseDown.done()
 if (!event.dataTransfer) return

 let sel = view.state.selection
 let pos = sel.empty ? null : view.posAtCoords(eventCoords(event))
 let node: undefined | NodeSelection
 if (pos && pos.pos >= sel.from && pos.pos <= (sel instanceof NodeSelection ? sel.to - 1: sel.to)) {
   // In selection
 } else if (mouseDown && mouseDown.mightDrag) {
   node = NodeSelection.create(view.state.doc, mouseDown.mightDrag.pos)
 } else if (event.target && (event.target as HTMLElement).nodeType == 1) {
   let desc = view.docView.nearestDesc(event.target as HTMLElement, true)
   if (desc && desc.node.type.spec.draggable && desc != view.docView)
     node = NodeSelection.create(view.state.doc, desc.posBefore)
 }
 let draggedSlice = (node || view.state.selection).content()
 let {dom, text, slice} = serializeForClipboard(view, draggedSlice)
 // Pre-120 Chrome versions clear files when calling `clearData` (#1472)
 if (!event.dataTransfer.files.length || !browser.chrome || browser.chrome_version > 120)
   event.dataTransfer.clearData()
 event.dataTransfer.setData(brokenClipboardAPI ? "Text" : "text/html", dom.innerHTML)
 // See https://github.com/ProseMirror/prosemirror/issues/1156
 event.dataTransfer.effectAllowed = "copyMove"
 if (!brokenClipboardAPI) event.dataTransfer.setData("text/plain", text)
 view.dragging = new Dragging(slice, dragMoves(view, event), node)
}

handlers.dragend = view => {
 let dragging = view.dragging
 window.setTimeout(() => {
   if (view.dragging == dragging)  view.dragging = null
 }, 50)
}

editHandlers.dragover = editHandlers.dragenter = (_, e) => e.preventDefault()

editHandlers.drop = (view, event) => {
 try {
   handleDrop(view, event as DragEvent, view.dragging)
 } finally {
   view.dragging = null
 }
}

function handleDrop(view: EditorView, event: DragEvent, dragging: Dragging | null) {
 if (!event.dataTransfer) return

 let eventPos = view.posAtCoords(eventCoords(event))
 if (!eventPos) return
 let $mouse = view.state.doc.resolve(eventPos.pos)
 let slice = dragging && dragging.slice
 if (slice) {
   view.someProp("transformPasted", f => { slice = f(slice!, view, false) })
 } else {
   slice = parseFromClipboard(view, getText(event.dataTransfer),
                              brokenClipboardAPI ? null : event.dataTransfer.getData("text/html"), false, $mouse)
 }
 let move = !!(dragging && dragMoves(view, event))
 if (view.someProp("handleDrop", f => f(view, event, slice || Slice.empty, move))) {
   event.preventDefault()
   return
 }
 if (!slice) return

 event.preventDefault()
 let insertPos = slice ? dropPoint(view.state.doc, $mouse.pos, slice) : $mouse.pos
 if (insertPos == null) insertPos = $mouse.pos

 let tr = view.state.tr
 if (move) {
   let {node} = dragging as Dragging
   if (node) node.replace(tr)
   else tr.deleteSelection()
 }

 let pos = tr.mapping.map(insertPos)
 let isNode = slice.openStart == 0 && slice.openEnd == 0 && slice.content.childCount == 1
 let beforeInsert = tr.doc
 if (isNode)
   tr.replaceRangeWith(pos, pos, slice.content.firstChild!)
 else
   tr.replaceRange(pos, pos, slice)
 if (tr.doc.eq(beforeInsert)) return

 let $pos = tr.doc.resolve(pos)
 if (isNode && NodeSelection.isSelectable(slice.content.firstChild!) &&
     $pos.nodeAfter && $pos.nodeAfter.sameMarkup(slice.content.firstChild!)) {
   tr.setSelection(new NodeSelection($pos))
 } else {
   let end = tr.mapping.map(insertPos)
   tr.mapping.maps[tr.mapping.maps.length - 1].forEach((_from, _to, _newFrom, newTo) => end = newTo)
   tr.setSelection(selectionBetween(view, $pos, tr.doc.resolve(end)))
 }
 view.focus()
 view.dispatch(tr.setMeta("uiEvent", "drop"))
}

handlers.focus = view => {
 view.input.lastFocus = Date.now()
 if (!view.focused) {
   view.domObserver.stop()
   view.dom.classList.add("ProseMirror-focused")
   view.domObserver.start()
   view.focused = true
   setTimeout(() => {
     if (view.docView && view.hasFocus() && !view.domObserver.currentSelection.eq(view.domSelectionRange()))
       selectionToDOM(view)
   }, 20)
 }
}

handlers.blur = (view, _event) => {
 let event = _event as FocusEvent
 if (view.focused) {
   view.domObserver.stop()
   view.dom.classList.remove("ProseMirror-focused")
   view.domObserver.start()
   if (event.relatedTarget && view.dom.contains(event.relatedTarget as HTMLElement))
     view.domObserver.currentSelection.clear()
   view.focused = false
 }
}

handlers.beforeinput = (view, _event: Event) => {
 let event = _event as InputEvent
 // We should probably do more with beforeinput events, but support
 // is so spotty that I'm still waiting to see where they are going.

 // Very specific hack to deal with backspace sometimes failing on
 // Chrome Android when after an uneditable node.
 if (browser.chrome && browser.android && event.inputType == "deleteContentBackward") {
   view.domObserver.flushSoon()
   let {domChangeCount} = view.input
   setTimeout(() => {
     if (view.input.domChangeCount != domChangeCount) return // Event already had some effect
     // This bug tends to close the virtual keyboard, so we refocus
     view.dom.blur()
     view.focus()
     if (view.someProp("handleKeyDown", f => f(view, keyEvent(8, "Backspace")))) return
     let {$cursor} = view.state.selection as TextSelection
     // Crude approximation of backspace behavior when no command handled it
     if ($cursor && $cursor.pos > 0) view.dispatch(view.state.tr.delete($cursor.pos - 1, $cursor.pos).scrollIntoView())
   }, 50)
 }
}

// Make sure all handlers get registered
for (let prop in editHandlers) handlers[prop] = editHandlers[prop]