json-joy
Version:
Collection of libraries for building collaborative editing apps.
30 lines (29 loc) • 1.07 kB
JavaScript
export const getCursorPosition = typeof document !== 'undefined' && document.caretPositionFromPoint
? (x, y) => {
const range = document.caretPositionFromPoint(x, y);
return range ? [range.offsetNode, range.offset] : null;
}
: (x, y) => {
const range = document.caretRangeFromPoint(x, y);
return range ? [range.startContainer, range.startOffset] : null;
};
export const unit = (event) => event.metaKey ? 'vline' : event.altKey || event.ctrlKey ? 'word' : '';
/**
* Save the current browser selection, so that it can be restored later. Returns
* a callback to restore the selection.
*
* @returns Callback to restore the selection.
*/
export const saveSelection = () => {
const selection = window?.getSelection();
if (!selection)
return;
const ranges = [];
for (let i = 0; i < selection.rangeCount; i++)
ranges.push(selection.getRangeAt(i));
return () => {
selection.removeAllRanges();
for (const range of ranges)
selection.addRange(range);
};
};