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import type {
BoxSelectionChange,
SelectionState,
} from "@/selection/types";
function dedupeIds({ ids }: { ids: string[] }) {
return [...new Set(ids)];
}
function getRangeIds({
orderedIds,
anchorId,
targetId,
}: {
orderedIds: string[];
anchorId: string;
targetId: string;
}) {
const anchorIndex = orderedIds.indexOf(anchorId);
const targetIndex = orderedIds.indexOf(targetId);
if (anchorIndex === -1 || targetIndex === -1) {
return [targetId];
}
const rangeStart = Math.min(anchorIndex, targetIndex);
const rangeEnd = Math.max(anchorIndex, targetIndex);
return orderedIds.slice(rangeStart, rangeEnd + 1);
}
export function replaceSelection({
ids,
anchorId,
}: {
ids: string[];
anchorId?: string | null;
}): SelectionState {
const selectedIds = dedupeIds({ ids });
return {
selectedIds,
anchorId: anchorId ?? selectedIds[selectedIds.length - 1] ?? null,
};
}
export function clearSelection(): SelectionState {
return {
selectedIds: [],
anchorId: null,
};
}
export function pruneSelection({
state,
orderedIds,
}: {
state: SelectionState;
orderedIds: string[];
}): SelectionState {
const validIds = new Set(orderedIds);
const selectedIds = state.selectedIds.filter((id) => validIds.has(id));
const anchorId =
state.anchorId && validIds.has(state.anchorId)
? state.anchorId
: selectedIds[selectedIds.length - 1] ?? null;
const isUnchanged =
selectedIds.length === state.selectedIds.length &&
anchorId === state.anchorId;
if (isUnchanged) {
return state;
}
return {
selectedIds,
anchorId,
};
}
export function isSelected({
state,
id,
}: {
state: SelectionState;
id: string;
}) {
return state.selectedIds.includes(id);
}
export function toggleSelection({
state,
id,
}: {
state: SelectionState;
id: string;
}): SelectionState {
if (isSelected({ state, id })) {
const selectedIds = state.selectedIds.filter((selectedId) => selectedId !== id);
const anchorId =
state.anchorId === id
? selectedIds[selectedIds.length - 1] ?? null
: state.anchorId;
return replaceSelection({
ids: selectedIds,
anchorId,
});
}
return replaceSelection({
ids: [...state.selectedIds, id],
anchorId: id,
});
}
export function selectRange({
state,
orderedIds,
targetId,
isAdditive,
}: {
state: SelectionState;
orderedIds: string[];
targetId: string;
isAdditive: boolean;
}): SelectionState {
const anchorId =
state.anchorId ??
state.selectedIds[state.selectedIds.length - 1] ??
targetId;
const rangeIds = getRangeIds({
orderedIds,
anchorId,
targetId,
});
const selectedIds = isAdditive
? dedupeIds({
ids: [...state.selectedIds, ...rangeIds],
})
: rangeIds;
return replaceSelection({
ids: selectedIds,
anchorId,
});
}
export function applyBoxSelection({
intersectedIds,
initialSelectedIds,
initialAnchorId,
isAdditive,
}: BoxSelectionChange): SelectionState {
const selectedIds = isAdditive
? dedupeIds({
ids: [...initialSelectedIds, ...intersectedIds],
})
: intersectedIds;
const anchorId = isAdditive
? initialAnchorId ?? intersectedIds[intersectedIds.length - 1] ?? null
: intersectedIds[intersectedIds.length - 1] ?? null;
return replaceSelection({
ids: selectedIds,
anchorId,
});
}
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