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/**
* Utilities for single-line deletion
*/
import { Editor, Range } from 'slate'
import { DOMEditor } from '../plugin/dom-editor'
const doRectsIntersect = (rect: DOMRect, compareRect: DOMRect) => {
const middle = (compareRect.top + compareRect.bottom) / 2
return rect.top <= middle && rect.bottom >= middle
}
const areRangesSameLine = (editor: DOMEditor, range1: Range, range2: Range) => {
const rect1 = DOMEditor.toDOMRange(editor, range1).getBoundingClientRect()
const rect2 = DOMEditor.toDOMRange(editor, range2).getBoundingClientRect()
return doRectsIntersect(rect1, rect2) && doRectsIntersect(rect2, rect1)
}
/**
* A helper utility that returns the end portion of a `Range`
* which is located on a single line.
*
* @param {Editor} editor The editor object to compare against
* @param {Range} parentRange The parent range to compare against
* @returns {Range} A valid portion of the parentRange which is one a single line
*/
export const findCurrentLineRange = (
editor: DOMEditor,
parentRange: Range
): Range => {
const parentRangeBoundary = Editor.range(editor, Range.end(parentRange))
const positions = Array.from(Editor.positions(editor, { at: parentRange }))
let left = 0
let right = positions.length
let middle = Math.floor(right / 2)
if (
areRangesSameLine(
editor,
Editor.range(editor, positions[left]),
parentRangeBoundary
)
) {
return Editor.range(editor, positions[left], parentRangeBoundary)
}
if (positions.length < 2) {
return Editor.range(
editor,
positions[positions.length - 1],
parentRangeBoundary
)
}
while (middle !== positions.length && middle !== left) {
if (
areRangesSameLine(
editor,
Editor.range(editor, positions[middle]),
parentRangeBoundary
)
) {
right = middle
} else {
left = middle
}
middle = Math.floor((left + right) / 2)
}
return Editor.range(editor, positions[left], parentRangeBoundary)
}
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