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src/composables/useKfSelection.ts

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+import { computed, ref } from 'vue'
+
+export interface KfSelectionKey {
+  layerId: string
+  kind: 'main' | 'position' | 'rotation'
+  keyframeId: string
+}
+
+const selectedKfs = ref<KfSelectionKey[]>([])
+
+export function kfSelectionKey(k: KfSelectionKey): string {
+  return `${k.layerId}:${k.kind}:${k.keyframeId}`
+}
+
+const selectedKfSet = computed(() => {
+  const s = new Set<string>()
+  for (const k of selectedKfs.value) s.add(kfSelectionKey(k))
+  return s
+})
+
+export function useKfSelection() {
+  return { selectedKfs, selectedKfSet }
+}