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TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215import { Replicache } from "replicache";import { ReplicacheMutators } from "src/replicache";import { getSortedSelection } from "components/SelectionManager/selectionState";import { getPageBlocks } from "src/replicache/getBlocks";import { isZoomedBlockRoot, useUIState } from "src/useUIState";import { unfoldBlocks } from "src/utils/foldBlocks";
type BlockData = ReturnType<typeof getPageBlocks>[number];
// A block's real parent for ordering: its list container, or the page for root// blocks (getPageBlocks reports `parent` as the page for every block).let realParent = (b: BlockData) => b.listData?.parent ?? b.parent;
// Index of the last block in the folded section that begins at `headingIndex`// (the heading itself plus every following block whose headingPath includes it).let sectionEnd = (siblings: BlockData[], headingIndex: number) => { let heading = siblings[headingIndex].entityID; let end = headingIndex; while ( end + 1 < siblings.length && siblings[end + 1].headingPath?.includes(heading) ) end++; return end;};
// Move the contiguous run siblings[first..last] up or down by one visible slot// among `siblings`, hopping over any adjacent folded heading section so the run// never lands inside hidden content. `siblings` must be the ordered direct// children of `parent`.let relocateRun = ( rep: Replicache<ReplicacheMutators>, parent: string, siblings: BlockData[], first: number, last: number, direction: "up" | "down", folded: string[],) => { let run = siblings.slice(first, last + 1).map((b) => b.entityID); let anchor: string | null; if (direction === "up") { if (first === 0) return; // already at the top let prev = siblings[first - 1]; // If the block above sits inside a folded section, hop to that section's // heading so we land above it rather than within its hidden content. let foldedAncestor = prev.headingPath?.find((h) => folded.includes(h)); let targetIndex = foldedAncestor ? siblings.findIndex((b) => b.entityID === foldedAncestor) : first - 1; anchor = siblings[targetIndex - 1]?.entityID ?? null; } else { if (last === siblings.length - 1) return; // already at the bottom let next = siblings[last + 1]; // If the next unit is itself a folded heading, hop past its whole section. let targetIndex = next.type === "heading" && folded.includes(next.entityID) ? sectionEnd(siblings, last + 1) : last + 1; anchor = siblings[targetIndex].entityID; } rep.mutate.moveBlocks({ parent, blocks: run, after: anchor });};
// Direct children of `parent` in document order. `parent` is the page for root// blocks or a list item for nested ones.let childrenOf = (allBlocks: BlockData[], page: string, parent: string) => parent === page ? allBlocks.filter((b) => !b.listData || b.listData.depth === 1) : allBlocks.filter((b) => b.listData?.parent === parent);
// When a folded heading is moved, relocate its entire collapsed section (the// heading plus every root block in its range) as one unit. Returns true when it// handled the move.const moveFoldedHeadingSection = async ( rep: Replicache<ReplicacheMutators>, block: BlockData, direction: "up" | "down",): Promise<boolean> => { let folded = useUIState.getState().foldedBlocks; if (block.type !== "heading" || !folded.includes(block.entityID)) return false;
let allBlocks = getPageBlocks(rep, block.parent); let rootBlocks = childrenOf(allBlocks, block.parent, block.parent); let start = rootBlocks.findIndex((b) => b.entityID === block.entityID); if (start === -1) return false; let end = sectionEnd(rootBlocks, start); relocateRun(rep, block.parent, rootBlocks, start, end, direction, folded); return true;};
// Move a multi-block selection up/down as a unit. Only contiguous selections// that share one parent are supported (the shape the selection UI produces);// anything else is left for the caller's single-block paths.const moveMultipleBlocks = async ( rep: Replicache<ReplicacheMutators>, sortedBlocks: BlockData[], direction: "up" | "down",): Promise<boolean> => { let folded = useUIState.getState().foldedBlocks; let page = sortedBlocks[0].parent; let parent = realParent(sortedBlocks[0]); if (!sortedBlocks.every((b) => realParent(b) === parent)) return false;
let allBlocks = getPageBlocks(rep, page); let siblings = childrenOf(allBlocks, page, parent); let selected = new Set(sortedBlocks.map((b) => b.entityID)); let indices = siblings .map((b, i) => (selected.has(b.entityID) ? i : -1)) .filter((i) => i >= 0); if (indices.length === 0) return false; let first = indices[0]; let last = indices[indices.length - 1];
// A selected folded heading carries its hidden section along with it. for (let i = first; i <= last; i++) { let b = siblings[i]; if (b.type === "heading" && folded.includes(b.entityID)) last = Math.max(last, sectionEnd(siblings, i)); } relocateRun(rep, parent, siblings, first, last, direction, folded); return true;};
export const moveBlockUp = async (rep: Replicache<ReplicacheMutators>) => { let [sortedBlocks, siblings] = await getSortedSelection(rep); if (sortedBlocks.length > 1) { await moveMultipleBlocks(rep, sortedBlocks, "up"); return; } let block = sortedBlocks[0]; if (!block || isZoomedBlockRoot(block.entityID)) return; if (await moveFoldedHeadingSection(rep, block, "up")) return; let previousBlock = siblings?.[siblings.findIndex((s) => s.entityID === block.entityID) - 1]; if (previousBlock.entityID === block.listData?.parent) { previousBlock = siblings?.[siblings.findIndex((s) => s.entityID === block.entityID) - 2]; }
if ( previousBlock?.listData && block.listData && block.listData.depth > 1 && !previousBlock.listData.path.find( (f) => f.entity === block.listData?.parent, ) ) { let depth = block.listData.depth; let newParent = previousBlock.listData.path.find( (f) => f.depth === depth - 1, ); if (!newParent) return; unfoldBlocks(rep, [newParent.entity]); rep?.mutate.moveBlock({ block: block.entityID, oldParent: block.listData?.parent, newParent: newParent.entity, position: { type: "end" }, }); } else { rep?.mutate.moveBlockUp({ entityID: block.entityID, parent: block.listData?.parent || block.parent, }); }};
export const moveBlockDown = async ( rep: Replicache<ReplicacheMutators>, permission_set: string,) => { let [sortedBlocks, siblings] = await getSortedSelection(rep); if (sortedBlocks.length > 1) { await moveMultipleBlocks(rep, sortedBlocks, "down"); return; } let block = sortedBlocks[0]; if (!block || isZoomedBlockRoot(block.entityID)) return; if (await moveFoldedHeadingSection(rep, block, "down")) return; let nextBlock = siblings .slice(siblings.findIndex((s) => s.entityID === block.entityID) + 1) .find( (f) => f.listData && block.listData && !f.listData.path.find((f) => f.entity === block.entityID), ); if ( nextBlock?.listData && block.listData && nextBlock.listData.depth === block.listData.depth - 1 ) { unfoldBlocks(rep, [nextBlock.entityID]); rep?.mutate.moveBlock({ block: block.entityID, oldParent: block.listData?.parent, newParent: nextBlock.entityID, position: { type: "first" }, }); } else { // Moving down past a folded heading lands the block inside its hidden // section; unfold it so the moved block stays visible. let visibleNext = siblings[siblings.findIndex((s) => s.entityID === block.entityID) + 1]; if (visibleNext?.type === "heading") unfoldBlocks(rep, [visibleNext.entityID]); rep?.mutate.moveBlockDown({ entityID: block.entityID, parent: block.listData?.parent || block.parent, permission_set: permission_set, }); }};