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