Mercurial
diff .cms/lib/codemirror/src/util/feature_detection.js @ 0:78edf6b517a0 draft
24.10
author | Coffee CMS <info@coffee-cms.ru> |
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date | Fri, 11 Oct 2024 22:40:23 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.cms/lib/codemirror/src/util/feature_detection.js Fri Oct 11 22:40:23 2024 +0000 @@ -0,0 +1,84 @@ +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 +}