47 lines
1.5 KiB
TypeScript
47 lines
1.5 KiB
TypeScript
// Tracks open windows and the persisted window id list used to restore
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// windows (and their per-window persisted state) across app launches.
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export function createWindowRegistry<W>(persistence: {
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read: () => unknown
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write: (ids: string[]) => void
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cleanup: (id: string) => void
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}) {
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const windows = new Map<string, W>()
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let quitting = false
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let lastFocusedID: string | undefined
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const persisted = () => {
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const value = persistence.read()
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if (!Array.isArray(value)) return []
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return value.filter((id): id is string => typeof id === "string" && id.length > 0)
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}
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return {
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persisted,
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setQuitting(value = true) {
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quitting = value
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},
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register(id: string, window: W) {
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windows.set(id, window)
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const ids = persisted()
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if (!ids.includes(id)) persistence.write([...ids, id])
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},
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focused(id: string) {
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lastFocusedID = id
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},
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lastFocused() {
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if (!lastFocusedID) return
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return windows.get(lastFocusedID)
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},
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closed(id: string) {
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windows.delete(id)
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if (lastFocusedID === id) lastFocusedID = windows.keys().next().value
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// Only a deliberate close (app keeps running with other windows open)
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// forgets a window. Closing the last window quits the app and fires
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// `closed` before `before-quit`, so treat it as a quit and keep the id
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// for restore on next launch.
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if (quitting || windows.size === 0) return
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persistence.write(persisted().filter((item) => item !== id))
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persistence.cleanup(id)
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},
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}
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}
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