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