Mercurial
comparison .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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-1:000000000000 | 0:78edf6b517a0 |
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1 import { elt, range, removeChildren, removeChildrenAndAdd } from "./dom.js" | |
2 import { ie, ie_version } from "./browser.js" | |
3 | |
4 // Detect drag-and-drop | |
5 export let dragAndDrop = function() { | |
6 // There is *some* kind of drag-and-drop support in IE6-8, but I | |
7 // couldn't get it to work yet. | |
8 if (ie && ie_version < 9) return false | |
9 let div = elt('div') | |
10 return "draggable" in div || "dragDrop" in div | |
11 }() | |
12 | |
13 let zwspSupported | |
14 export function zeroWidthElement(measure) { | |
15 if (zwspSupported == null) { | |
16 let test = elt("span", "\u200b") | |
17 removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")])) | |
18 if (measure.firstChild.offsetHeight != 0) | |
19 zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8) | |
20 } | |
21 let node = zwspSupported ? elt("span", "\u200b") : | |
22 elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px") | |
23 node.setAttribute("cm-text", "") | |
24 return node | |
25 } | |
26 | |
27 // Feature-detect IE's crummy client rect reporting for bidi text | |
28 let badBidiRects | |
29 export function hasBadBidiRects(measure) { | |
30 if (badBidiRects != null) return badBidiRects | |
31 let txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA")) | |
32 let r0 = range(txt, 0, 1).getBoundingClientRect() | |
33 let r1 = range(txt, 1, 2).getBoundingClientRect() | |
34 removeChildren(measure) | |
35 if (!r0 || r0.left == r0.right) return false // Safari returns null in some cases (#2780) | |
36 return badBidiRects = (r1.right - r0.right < 3) | |
37 } | |
38 | |
39 // See if "".split is the broken IE version, if so, provide an | |
40 // alternative way to split lines. | |
41 export let splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? string => { | |
42 let pos = 0, result = [], l = string.length | |
43 while (pos <= l) { | |
44 let nl = string.indexOf("\n", pos) | |
45 if (nl == -1) nl = string.length | |
46 let line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl) | |
47 let rt = line.indexOf("\r") | |
48 if (rt != -1) { | |
49 result.push(line.slice(0, rt)) | |
50 pos += rt + 1 | |
51 } else { | |
52 result.push(line) | |
53 pos = nl + 1 | |
54 } | |
55 } | |
56 return result | |
57 } : string => string.split(/\r\n?|\n/) | |
58 | |
59 export let hasSelection = window.getSelection ? te => { | |
60 try { return te.selectionStart != te.selectionEnd } | |
61 catch(e) { return false } | |
62 } : te => { | |
63 let range | |
64 try {range = te.ownerDocument.selection.createRange()} | |
65 catch(e) {} | |
66 if (!range || range.parentElement() != te) return false | |
67 return range.compareEndPoints("StartToEnd", range) != 0 | |
68 } | |
69 | |
70 export let hasCopyEvent = (() => { | |
71 let e = elt("div") | |
72 if ("oncopy" in e) return true | |
73 e.setAttribute("oncopy", "return;") | |
74 return typeof e.oncopy == "function" | |
75 })() | |
76 | |
77 let badZoomedRects = null | |
78 export function hasBadZoomedRects(measure) { | |
79 if (badZoomedRects != null) return badZoomedRects | |
80 let node = removeChildrenAndAdd(measure, elt("span", "x")) | |
81 let normal = node.getBoundingClientRect() | |
82 let fromRange = range(node, 0, 1).getBoundingClientRect() | |
83 return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1 | |
84 } |