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File: editor/codemirror/src/util/feature_detection.js

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  Classes of Cedric Maenetja   Custom PHP HTML Parser   editor/codemirror/src/util/feature_detection.js   Download  
File: editor/codemirror/src/util/feature_detection.js
Role: Auxiliary data
Content type: text/plain
Description: Auxiliary data
Class: Custom PHP HTML Parser
Process HTML to replace it with parameter values
Author: By
Last change:
Date: 1 year ago
Size: 2,994 bytes
 

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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 }