1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
/**
* Tree queries the chrome needs — pure walks over the layout tree.
*/
import type { LayoutNode, LayoutTree, PanelsNode, Path } from "@dispatch/layout-contract";
/** The first panels node in the tree (the panel-selection owner), if any. */
export function firstPanelsNode(tree: LayoutTree): { node: PanelsNode; path: Path } | null {
const seen: { node: PanelsNode; path: Path }[] = [];
const visit = (node: LayoutNode, path: Path): void => {
if (seen.length > 0) return;
if (node.kind === "panels") {
seen.push({ node, path });
return;
}
const kids: readonly LayoutNode[] =
node.kind === "split"
? node.children.map((c) => c.node)
: node.kind === "stack"
? node.children.map((c) => c.node)
: [];
for (const [i, child] of kids.entries()) visit(child, [...path, i]);
};
visit(tree.root, []);
return seen[0] ?? null;
}
/**
* The node id of the tree's FIRST collapsible split child — the one the chrome
* top bar's toggle reads/writes (`findById("side")` on the default tree;
* generically the first collapsible child, root-first then titlebar). Falls
* back to a path-derived key when the child's node has no id. Null → the tree
* has nothing collapsible (the toggle button hides).
*/
export function firstCollapsibleNodeId(tree: LayoutTree): string | null {
const visit = (node: LayoutNode, path: Path): string | null => {
if (node.kind === "split") {
for (const [i, child] of node.children.entries()) {
if (!child.collapsible) continue;
if (child.node.id !== undefined) return child.node.id;
return [...path, i].map((s) => String(s)).join(":");
}
}
const kids: readonly LayoutNode[] =
node.kind === "split"
? node.children.map((c) => c.node)
: node.kind === "stack"
? node.children.map((c) => c.node)
: [];
for (const [i, child] of kids.entries()) {
const found = visit(child, [...path, i]);
if (found !== null) return found;
}
return null;
};
const inRoot = visit(tree.root, []);
if (inRoot !== null) return inRoot;
if (tree.titlebar !== undefined) return visit(tree.titlebar, ["titlebar"]);
return null;
}
|
