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14 changes: 8 additions & 6 deletions packages/react-arborist/src/dnd/compute-drop.ts
Original file line number Diff line number Diff line change
Expand Up @@ -60,18 +60,19 @@ function getDropLevel(
hovering: HoverData,
aboveCursor: NodeApi | null,
belowCursor: NodeApi | null,
indent: number
indent: number,
isAboveNodeOpen: boolean
) {
const hoverLevel = Math.round(Math.max(0, hovering.x - indent) / indent);
let min, max;
if (!aboveCursor) {
max = 0;
min = 0;
} else if (!belowCursor) {
max = aboveCursor.level;
max = aboveCursor.level + (isAboveNodeOpen ? 1 : 0);
min = 0;
} else {
max = aboveCursor.level;
max = aboveCursor.level + (isAboveNodeOpen ? 1 : 0);
min = belowCursor.level;
}

Expand Down Expand Up @@ -150,16 +151,17 @@ export function computeDrop(args: Args): ComputedDrop {

/* The above node is an item or a closed folder */
if (isItem(above) || isClosed(above)) {
const level = getDropLevel(hover, above, below, args.indent);
const level = getDropLevel(hover, above, below, args.indent, false);
return {
drop: walkUpFrom(above, level),
cursor: lineCursor(above.rowIndex! + 1, level),
};
}

/* The above node is an open folder */
const level = getDropLevel(hover, above, below, args.indent, true);
return {
drop: dropAt(above?.id, 0),
cursor: lineCursor(above.rowIndex! + 1, above.level + 1),
drop: level === above.level + 1 ? dropAt(above?.id, 0) : walkUpFrom(above, level),
cursor: lineCursor(above.rowIndex! + 1, level),
};
}