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- import { elt, range, removeChildren, removeChildrenAndAdd } from "./dom.js"
- import { ie, ie_version } from "./browser.js"
- // Detect drag-and-drop
- export let dragAndDrop = function() {
- // There is *some* kind of drag-and-drop support in IE6-8, but I
- // couldn't get it to work yet.
- if (ie && ie_version < 9) return false
- let div = elt('div')
- return "draggable" in div || "dragDrop" in div
- }()
- let zwspSupported
- export function zeroWidthElement(measure) {
- if (zwspSupported == null) {
- let test = elt("span", "\u200b")
- removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]))
- if (measure.firstChild.offsetHeight != 0)
- zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8)
- }
- let node = zwspSupported ? elt("span", "\u200b") :
- elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px")
- node.setAttribute("cm-text", "")
- return node
- }
- // Feature-detect IE's crummy client rect reporting for bidi text
- let badBidiRects
- export function hasBadBidiRects(measure) {
- if (badBidiRects != null) return badBidiRects
- let txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"))
- let r0 = range(txt, 0, 1).getBoundingClientRect()
- let r1 = range(txt, 1, 2).getBoundingClientRect()
- removeChildren(measure)
- if (!r0 || r0.left == r0.right) return false // Safari returns null in some cases (#2780)
- return badBidiRects = (r1.right - r0.right < 3)
- }
- // See if "".split is the broken IE version, if so, provide an
- // alternative way to split lines.
- export let splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? string => {
- let pos = 0, result = [], l = string.length
- while (pos <= l) {
- let nl = string.indexOf("\n", pos)
- if (nl == -1) nl = string.length
- let line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl)
- let rt = line.indexOf("\r")
- if (rt != -1) {
- result.push(line.slice(0, rt))
- pos += rt + 1
- } else {
- result.push(line)
- pos = nl + 1
- }
- }
- return result
- } : string => string.split(/\r\n?|\n/)
- export let hasSelection = window.getSelection ? te => {
- try { return te.selectionStart != te.selectionEnd }
- catch(e) { return false }
- } : te => {
- let range
- try {range = te.ownerDocument.selection.createRange()}
- catch(e) {}
- if (!range || range.parentElement() != te) return false
- return range.compareEndPoints("StartToEnd", range) != 0
- }
- export let hasCopyEvent = (() => {
- let e = elt("div")
- if ("oncopy" in e) return true
- e.setAttribute("oncopy", "return;")
- return typeof e.oncopy == "function"
- })()
- let badZoomedRects = null
- export function hasBadZoomedRects(measure) {
- if (badZoomedRects != null) return badZoomedRects
- let node = removeChildrenAndAdd(measure, elt("span", "x"))
- let normal = node.getBoundingClientRect()
- let fromRange = range(node, 0, 1).getBoundingClientRect()
- return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1
- }
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