import { operation, runInOp } from "../display/operations.js"
import { prepareSelection } from "../display/selection.js"
import { applyTextInput, copyableRanges, handlePaste, hiddenTextarea, setLastCopied } from "./input.js"
import { cursorCoords, posFromMouse } from "../measurement/position_measurement.js"
import { eventInWidget } from "../measurement/widgets.js"
import { simpleSelection } from "../model/selection.js"
import { selectAll, setSelection } from "../model/selection_updates.js"
import { captureRightClick, ie, ie_version, ios, mac, mobile, presto, webkit } from "../util/browser.js"
import { activeElt, removeChildrenAndAdd, selectInput } from "../util/dom.js"
import { e_preventDefault, e_stop, off, on, signalDOMEvent } from "../util/event.js"
import { hasSelection } from "../util/feature_detection.js"
import { Delayed, sel_dontScroll } from "../util/misc.js"
// TEXTAREA INPUT STYLE
export default class TextareaInput {
constructor(cm) {
this.cm = cm
// See input.poll and input.reset
this.prevInput = ""
// Flag that indicates whether we expect input to appear real soon
// now (after some event like 'keypress' or 'input') and are
// polling intensively.
this.pollingFast = false
// Self-resetting timeout for the poller
this.polling = new Delayed()
// Used to work around IE issue with selection being forgotten when focus moves away from textarea
this.hasSelection = false
this.composing = null
this.resetting = false
}
init(display) {
let input = this, cm = this.cm
this.createField(display)
const te = this.textarea
display.wrapper.insertBefore(this.wrapper, display.wrapper.firstChild)
// Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
if (ios) te.style.width = "0px"
on(te, "input", () => {
if (ie && ie_version >= 9 && this.hasSelection) this.hasSelection = null
input.poll()
})
on(te, "paste", e => {
if (signalDOMEvent(cm, e) || handlePaste(e, cm)) return
cm.state.pasteIncoming = +new Date
input.fastPoll()
})
function prepareCopyCut(e) {
if (signalDOMEvent(cm, e)) return
if (cm.somethingSelected()) {
setLastCopied({lineWise: false, text: cm.getSelections()})
} else if (!cm.options.lineWiseCopyCut) {
return
} else {
let ranges = copyableRanges(cm)
setLastCopied({lineWise: true, text: ranges.text})
if (e.type == "cut") {
cm.setSelections(ranges.ranges, null, sel_dontScroll)
} else {
input.prevInput = ""
te.value = ranges.text.join("\n")
selectInput(te)
}
}
if (e.type == "cut") cm.state.cutIncoming = +new Date
}
on(te, "cut", prepareCopyCut)
on(te, "copy", prepareCopyCut)
on(display.scroller, "paste", e => {
if (eventInWidget(display, e) || signalDOMEvent(cm, e)) return
if (!te.dispatchEvent) {
cm.state.pasteIncoming = +new Date
input.focus()
return
}
// Pass the `paste` event to the textarea so it's handled by its event listener.
const event = new Event("paste")
event.clipboardData = e.clipboardData
te.dispatchEvent(event)
})
// Prevent normal selection in the editor (we handle our own)
on(display.lineSpace, "selectstart", e => {
if (!eventInWidget(display, e)) e_preventDefault(e)
})
on(te, "compositionstart", () => {
let start = cm.getCursor("from")
if (input.composing) input.composing.range.clear()
input.composing = {
start: start,
range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})
}
})
on(te, "compositionend", () => {
if (input.composing) {
input.poll()
input.composing.range.clear()
input.composing = null
}
})
}
createField(_display) {
// Wraps and hides input textarea
this.wrapper = hiddenTextarea()
// The semihidden textarea that is focused when the editor is
// focused, and receives input.
this.textarea = this.wrapper.firstChild
}
screenReaderLabelChanged(label) {
// Label for screenreaders, accessibility
if(label) {
this.textarea.setAttribute('aria-label', label)
} else {
this.textarea.removeAttribute('aria-label')
}
}
prepareSelection() {
// Redraw the selection and/or cursor
let cm = this.cm, display = cm.display, doc = cm.doc
let result = prepareSelection(cm)
// Move the hidden textarea near the cursor to prevent scrolling artifacts
if (cm.options.moveInputWithCursor) {
let headPos = cursorCoords(cm, doc.sel.primary().head, "div")
let wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect()
result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
headPos.top + lineOff.top - wrapOff.top))
result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
headPos.left + lineOff.left - wrapOff.left))
}
return result
}
showSelection(drawn) {
let cm = this.cm, display = cm.display
removeChildrenAndAdd(display.cursorDiv, drawn.cursors)
removeChildrenAndAdd(display.selectionDiv, drawn.selection)
if (drawn.teTop != null) {
this.wrapper.style.top = drawn.teTop + "px"
this.wrapper.style.left = drawn.teLeft + "px"
}
}
// Reset the input to correspond to the selection (or to be empty,
// when not typing and nothing is selected)
reset(typing) {
if (this.contextMenuPending || this.composing && typing) return
let cm = this.cm
this.resetting = true
if (cm.somethingSelected()) {
this.prevInput = ""
let content = cm.getSelection()
this.textarea.value = content
if (cm.state.focused) selectInput(this.textarea)
if (ie && ie_version >= 9) this.hasSelection = content
} else if (!typing) {
this.prevInput = this.textarea.value = ""
if (ie && ie_version >= 9) this.hasSelection = null
}
this.resetting = false
}
getField() { return this.textarea }
supportsTouch() { return false }
focus() {
if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt(this.textarea.ownerDocument) != this.textarea)) {
try { this.textarea.focus() }
catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
}
}
blur() { this.textarea.blur() }
resetPosition() {
this.wrapper.style.top = this.wrapper.style.left = 0
}
receivedFocus() { this.slowPoll() }
// Poll for input changes, using the normal rate of polling. This
// runs as long as the editor is focused.
slowPoll() {
if (this.pollingFast) return
this.polling.set(this.cm.options.pollInterval, () => {
this.poll()
if (this.cm.state.focused) this.slowPoll()
})
}
// When an event has just come in that is likely to add or change
// something in the input textarea, we poll faster, to ensure that
// the change appears on the screen quickly.
fastPoll() {
let missed = false, input = this
input.pollingFast = true
function p() {
let changed = input.poll()
if (!changed && !missed) {missed = true; input.polling.set(60, p)}
else {input.pollingFast = false; input.slowPoll()}
}
input.polling.set(20, p)
}
// Read input from the textarea, and update the document to match.
// When something is selected, it is present in the textarea, and
// selected (unless it is huge, in which case a placeholder is
// used). When nothing is selected, the cursor sits after previously
// seen text (can be empty), which is stored in prevInput (we must
// not reset the textarea when typing, because that breaks IME).
poll() {
let cm = this.cm, input = this.textarea, prevInput = this.prevInput
// Since this is called a *lot*, try to bail out as cheaply as
// possible when it is clear that nothing happened. hasSelection
// will be the case when there is a lot of text in the textarea,
// in which case reading its value would be expensive.
if (this.contextMenuPending || this.resetting || !cm.state.focused ||
(hasSelection(input) && !prevInput && !this.composing) ||
cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq)
return false
let text = input.value
// If nothing changed, bail.
if (text == prevInput && !cm.somethingSelected()) return false
// Work around nonsensical selection resetting in IE9/10, and
// inexplicable appearance of private area unicode characters on
// some key combos in Mac (#2689).
if (ie && ie_version >= 9 && this.hasSelection === text ||
mac && /[\uf700-\uf7ff]/.test(text)) {
cm.display.input.reset()
return false
}
if (cm.doc.sel == cm.display.selForContextMenu) {
let first = text.charCodeAt(0)
if (first == 0x200b && !prevInput) prevInput = "\u200b"
if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo") }
}
// Find the part of the input that is actually new
let same = 0, l = Math.min(prevInput.length, text.length)
while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) ++same
runInOp(cm, () => {
applyTextInput(cm, text.slice(same), prevInput.length - same,
null, this.composing ? "*compose" : null)
// Don't leave long text in the textarea, since it makes further polling slow
if (text.length > 1000 || text.indexOf("\n") > -1) input.value = this.prevInput = ""
else this.prevInput = text
if (this.composing) {
this.composing.range.clear()
this.composing.range = cm.markText(this.composing.start, cm.getCursor("to"),
{className: "CodeMirror-composing"})
}
})
return true
}
ensurePolled() {
if (this.pollingFast && this.poll()) this.pollingFast = false
}
onKeyPress() {
if (ie && ie_version >= 9) this.hasSelection = null
this.fastPoll()
}
onContextMenu(e) {
let input = this, cm = input.cm, display = cm.display, te = input.textarea
if (input.contextMenuPending) input.contextMenuPending()
let pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop
if (!pos || presto) return // Opera is difficult.
// Reset the current text selection only if the click is done outside of the selection
// and 'resetSelectionOnContextMenu' option is true.
let reset = cm.options.resetSelectionOnContextMenu
if (reset && cm.doc.sel.contains(pos) == -1)
operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll)
let oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText
let wrapperBox = input.wrapper.offsetParent.getBoundingClientRect()
input.wrapper.style.cssText = "position: static"
te.style.cssText = `position: absolute; width: 30px; height: 30px;
top: ${e.clientY - wrapperBox.top - 5}px; left: ${e.clientX - wrapperBox.left - 5}px;
z-index: 1000; background: ${ie ? "rgba(255, 255, 255, .05)" : "transparent"};
outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);`
let oldScrollY
if (webkit) oldScrollY = te.ownerDocument.defaultView.scrollY // Work around Chrome issue (#2712)
display.input.focus()
if (webkit) te.ownerDocument.defaultView.scrollTo(null, oldScrollY)
display.input.reset()
// Adds "Select all" to context menu in FF
if (!cm.somethingSelected()) te.value = input.prevInput = " "
input.contextMenuPending = rehide
display.selForContextMenu = cm.doc.sel
clearTimeout(display.detectingSelectAll)
// Select-all will be greyed out if there's nothing to select, so
// this adds a zero-width space so that we can later check whether
// it got selected.
function prepareSelectAllHack() {
if (te.selectionStart != null) {
let selected = cm.somethingSelected()
let extval = "\u200b" + (selected ? te.value : "")
te.value = "\u21da" // Used to catch context-menu undo
te.value = extval
input.prevInput = selected ? "" : "\u200b"
te.selectionStart = 1; te.selectionEnd = extval.length
// Re-set this, in case some other handler touched the
// selection in the meantime.
display.selForContextMenu = cm.doc.sel
}
}
function rehide() {
if (input.contextMenuPending != rehide) return
input.contextMenuPending = false
input.wrapper.style.cssText = oldWrapperCSS
te.style.cssText = oldCSS
if (ie && ie_version < 9) display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos)
// Try to detect the user choosing select-all
if (te.selectionStart != null) {
if (!ie || (ie && ie_version < 9)) prepareSelectAllHack()
let i = 0, poll = () => {
if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
te.selectionEnd > 0 && input.prevInput == "\u200b") {
operation(cm, selectAll)(cm)
} else if (i++ < 10) {
display.detectingSelectAll = setTimeout(poll, 500)
} else {
display.selForContextMenu = null
display.input.reset()
}
}
display.detectingSelectAll = setTimeout(poll, 200)
}
}
if (ie && ie_version >= 9) prepareSelectAllHack()
if (captureRightClick) {
e_stop(e)
let mouseup = () => {
off(window, "mouseup", mouseup)
setTimeout(rehide, 20)
}
on(window, "mouseup", mouseup)
} else {
setTimeout(rehide, 50)
}
}
readOnlyChanged(val) {
if (!val) this.reset()
this.textarea.disabled = val == "nocursor"
this.textarea.readOnly = !!val
}
setUneditable() {}
}
TextareaInput.prototype.needsContentAttribute = false
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