src/Bindings/DomBinding/selection.js
/* globals getSelection */
import { getRelativePosition, fromRelativePosition } from '../../Util/relativePosition.js'
let browserSelection = null
let relativeSelection = null
/**
* @private
*/
export let beforeTransactionSelectionFixer
if (typeof getSelection !== 'undefined') {
beforeTransactionSelectionFixer = function _beforeTransactionSelectionFixer (y, domBinding, transaction, remote) {
if (!remote) {
return
}
relativeSelection = { from: null, to: null, fromY: null, toY: null }
browserSelection = getSelection()
const anchorNode = browserSelection.anchorNode
const anchorNodeType = domBinding.domToType.get(anchorNode)
if (anchorNode !== null && anchorNodeType !== undefined) {
relativeSelection.from = getRelativePosition(anchorNodeType, browserSelection.anchorOffset)
relativeSelection.fromY = anchorNodeType._y
}
const focusNode = browserSelection.focusNode
const focusNodeType = domBinding.domToType.get(focusNode)
if (focusNode !== null && focusNodeType !== undefined) {
relativeSelection.to = getRelativePosition(focusNodeType, browserSelection.focusOffset)
relativeSelection.toY = focusNodeType._y
}
}
} else {
beforeTransactionSelectionFixer = function _fakeBeforeTransactionSelectionFixer () {}
}
/**
* @private
*/
export function afterTransactionSelectionFixer (y, domBinding, transaction, remote) {
if (relativeSelection === null || !remote) {
return
}
const to = relativeSelection.to
const from = relativeSelection.from
const fromY = relativeSelection.fromY
const toY = relativeSelection.toY
let shouldUpdate = false
let anchorNode = browserSelection.anchorNode
let anchorOffset = browserSelection.anchorOffset
let focusNode = browserSelection.focusNode
let focusOffset = browserSelection.focusOffset
if (from !== null) {
let sel = fromRelativePosition(fromY, from)
if (sel !== null) {
let node = domBinding.typeToDom.get(sel.type)
let offset = sel.offset
if (node !== anchorNode || offset !== anchorOffset) {
anchorNode = node
anchorOffset = offset
shouldUpdate = true
}
}
}
if (to !== null) {
let sel = fromRelativePosition(toY, to)
if (sel !== null) {
let node = domBinding.typeToDom.get(sel.type)
let offset = sel.offset
if (node !== focusNode || offset !== focusOffset) {
focusNode = node
focusOffset = offset
shouldUpdate = true
}
}
}
if (shouldUpdate) {
browserSelection.setBaseAndExtent(
anchorNode,
anchorOffset,
focusNode,
focusOffset
)
}
}