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import type { CanvasComponent } from "@/types/canvas";
const HIERARCHY_DRAG_DATA_MIME = "application/x-swing-hierarchy-component";
type HierarchyType = "MenuBar" | "Menu" | "MenuItem" | "Panel" | "ToolBar" | "Other";
export type HierarchyDropPosition = "before" | "after" | "inside";
interface HierarchyDropInstruction {
parentId: string | null;
index: number;
}
export interface HierarchyDropTarget {
componentId: string;
position: HierarchyDropPosition;
}
export interface UseHierarchyDragDropOptions {
components: CanvasComponent[];
onMoveComponent: (componentId: string, parentId: string | null, index: number) => void;
}
export interface UseHierarchyDragDropResult {
draggingComponentId: string | null;
dropTarget: HierarchyDropTarget | null;
isDraggableComponent: (componentId: string) => boolean;
handleDragStart: (event: React.DragEvent<HTMLElement>, componentId: string) => void;
handleDragOver: (event: React.DragEvent<HTMLElement>, targetComponentId: string) => void;
handleDrop: (event: React.DragEvent<HTMLElement>, targetComponentId: string) => void;
handleDragEnd: () => void;
}
function toHierarchyType(type: string): HierarchyType {
switch (type) {
case "MenuBar":
case "JMenuBar":
return "MenuBar";
case "Menu":
case "JMenu":
return "Menu";
case "MenuItem":
case "JMenuItem":
return "MenuItem";
case "Panel":
case "JPanel":
return "Panel";
case "ToolBar":
case "JToolBar":
return "ToolBar";
default:
return "Other";
}
}
function isMovableType(type: HierarchyType): boolean {
return type !== "MenuBar" && type !== "ToolBar";
}
function canBeRoot(type: HierarchyType): boolean {
return type !== "Menu" && type !== "MenuItem";
}
function areEqualLists(first: readonly string[], second: readonly string[]): boolean {
if (first.length !== second.length) {
return false;
}
for (let index = 0; index < first.length; index += 1) {
if (first[index] !== second[index]) {
return false;
}
}
return true;
}
function clampIndex(index: number, length: number): number {
return Math.max(0, Math.min(index, length));
}
function getDraggingId(dataTransfer: DataTransfer): string | null {
const dragId =
dataTransfer.getData(HIERARCHY_DRAG_DATA_MIME) || dataTransfer.getData("text/plain");
const trimmedDragId = dragId.trim();
return trimmedDragId.length > 0 ? trimmedDragId : null;
}
function resolveParentId(
componentId: string,
components: CanvasComponent[],
componentsById: Map<string, CanvasComponent>,
): string | null {
const component = componentsById.get(componentId);
if (component?.parentId && componentsById.has(component.parentId)) {
return component.parentId;
}
const explicitParent = components.find((candidate) =>
(candidate.children ?? []).includes(componentId),
);
return explicitParent?.id ?? null;
}
function getOrderedChildIds(
parentId: string,
components: CanvasComponent[],
componentsById: Map<string, CanvasComponent>,
): string[] {
const parent = componentsById.get(parentId);
Iif (!parent) {
return [];
}
const explicitChildren: string[] = [];
for (const childId of parent.children ?? []) {
Eif (componentsById.has(childId) && !explicitChildren.includes(childId)) {
explicitChildren.push(childId);
}
}
const explicitChildIds = new Set(explicitChildren);
const implicitChildren = components
.filter((candidate) => candidate.parentId === parentId && !explicitChildIds.has(candidate.id))
.map((candidate) => candidate.id);
return [...explicitChildren, ...implicitChildren];
}
function getOrderedRootIds(
components: CanvasComponent[],
componentsById: Map<string, CanvasComponent>,
): string[] {
const rootIds: string[] = [];
const seen = new Set<string>();
for (const component of components) {
Iif (seen.has(component.id)) {
continue;
}
if (resolveParentId(component.id, components, componentsById) === null) {
rootIds.push(component.id);
seen.add(component.id);
}
}
return rootIds;
}
function resolveDropPosition(event: React.DragEvent<HTMLElement>): "before" | "after" {
const targetBounds = event.currentTarget.getBoundingClientRect();
return event.clientY >= targetBounds.top + targetBounds.height / 2 ? "after" : "before";
}
function canAcceptChildType(parentType: HierarchyType, childType: HierarchyType): boolean {
if (childType === "MenuBar" || childType === "ToolBar") {
return false;
}
switch (parentType) {
case "MenuBar":
return childType === "Menu";
case "Menu":
return childType === "Menu" || childType === "MenuItem";
case "Panel":
return childType !== "Menu" && childType !== "MenuItem";
case "ToolBar":
return childType !== "Panel" && childType !== "Menu" && childType !== "MenuItem";
default:
return false;
}
}
function canMoveToParent(childType: HierarchyType, parentType: HierarchyType | null): boolean {
if (parentType === null) {
return canBeRoot(childType);
}
return canAcceptChildType(parentType, childType);
}
function isAssignedToParent(component: CanvasComponent, parentId: string | null): boolean {
return parentId === null ? component.parentId == null : component.parentId === parentId;
}
function wouldCreateCycle(
draggedComponentId: string,
targetParentId: string,
components: CanvasComponent[],
componentsById: Map<string, CanvasComponent>,
): boolean {
Iif (draggedComponentId === targetParentId) {
return true;
}
const visited = new Set<string>([draggedComponentId]);
const queue = [draggedComponentId];
while (queue.length > 0) {
const currentId = queue.shift();
Iif (!currentId) {
continue;
}
for (const childId of getOrderedChildIds(currentId, components, componentsById)) {
Eif (childId === targetParentId) {
return true;
}
if (visited.has(childId)) {
continue;
}
visited.add(childId);
queue.push(childId);
}
}
return false;
}
function shouldForceInsideDrop(draggedType: HierarchyType, targetType: HierarchyType): boolean {
return (
(draggedType === "MenuItem" && targetType === "Menu") ||
(draggedType === "Menu" && targetType === "MenuBar")
);
}
function getDropPositionCandidates(
event: React.DragEvent<HTMLElement>,
draggedType: HierarchyType,
targetType: HierarchyType,
allowInside: boolean,
): HierarchyDropPosition[] {
Iif (shouldForceInsideDrop(draggedType, targetType)) {
return ["inside"];
}
Iif (!allowInside) {
return [resolveDropPosition(event)];
}
const targetBounds = event.currentTarget.getBoundingClientRect();
const offsetY = event.clientY - targetBounds.top;
const topThreshold = targetBounds.height * 0.25;
const bottomThreshold = targetBounds.height * 0.75;
Iif (offsetY <= topThreshold) {
return ["before", "inside", "after"];
}
Iif (offsetY >= bottomThreshold) {
return ["after", "inside", "before"];
}
return ["inside", "before", "after"];
}
function resolveDropInstruction(
draggedComponentId: string,
targetComponentId: string,
dropPosition: HierarchyDropPosition,
components: CanvasComponent[],
componentsById: Map<string, CanvasComponent>,
): HierarchyDropInstruction | null {
Iif (draggedComponentId === targetComponentId) {
return null;
}
const draggedComponent = componentsById.get(draggedComponentId);
const targetComponent = componentsById.get(targetComponentId);
Iif (!draggedComponent || !targetComponent) {
return null;
}
const draggedType = toHierarchyType(draggedComponent.type);
const targetType = toHierarchyType(targetComponent.type);
Eif (dropPosition === "inside") {
Iif (!canAcceptChildType(targetType, draggedType)) {
return null;
}
Iif (wouldCreateCycle(draggedComponentId, targetComponent.id, components, componentsById)) {
return null;
}
const targetChildren = getOrderedChildIds(
targetComponent.id,
components,
componentsById,
).filter((childId) => childId !== draggedComponentId);
return { parentId: targetComponent.id, index: targetChildren.length };
}
const targetParentId = resolveParentId(targetComponent.id, components, componentsById);
const targetParent = targetParentId ? componentsById.get(targetParentId) : null;
const targetParentType = targetParent ? toHierarchyType(targetParent.type) : null;
Iif (!canMoveToParent(draggedType, targetParentType)) {
return null;
}
if (
targetParentId &&
wouldCreateCycle(draggedComponentId, targetParentId, components, componentsById)
) {
return null;
}
const siblings = (
targetParentId
? getOrderedChildIds(targetParentId, components, componentsById)
: getOrderedRootIds(components, componentsById)
).filter((childId) => childId !== draggedComponentId);
const targetIndex = siblings.indexOf(targetComponent.id);
Iif (targetIndex < 0) {
return null;
}
return {
parentId: targetParentId,
index: dropPosition === "after" ? targetIndex + 1 : targetIndex,
};
}
function resolveDropForEvent(
event: React.DragEvent<HTMLElement>,
draggedComponentId: string,
targetComponentId: string,
components: CanvasComponent[],
componentsById: Map<string, CanvasComponent>,
): { instruction: HierarchyDropInstruction; position: HierarchyDropPosition } | null {
const draggedComponent = componentsById.get(draggedComponentId);
const targetComponent = componentsById.get(targetComponentId);
Iif (!draggedComponent || !targetComponent) {
return null;
}
const draggedType = toHierarchyType(draggedComponent.type);
const targetType = toHierarchyType(targetComponent.type);
const allowInside =
canAcceptChildType(targetType, draggedType) &&
!wouldCreateCycle(draggedComponentId, targetComponentId, components, componentsById);
const candidatePositions = getDropPositionCandidates(event, draggedType, targetType, allowInside);
for (const candidatePosition of candidatePositions) {
const instruction = resolveDropInstruction(
draggedComponentId,
targetComponentId,
candidatePosition,
components,
componentsById,
);
Eif (instruction) {
return { instruction, position: candidatePosition };
}
}
return null;
}
export function moveComponentInHierarchy(
components: CanvasComponent[],
componentId: string,
nextParentId: string | null,
nextIndex: number,
): CanvasComponent[] {
if (nextParentId && componentId === nextParentId) {
return components;
}
const componentsById = new Map(components.map((component) => [component.id, component]));
const component = componentsById.get(componentId);
const nextParent = nextParentId ? componentsById.get(nextParentId) : null;
if (!component || (nextParentId && !nextParent)) {
return components;
}
const componentType = toHierarchyType(component.type);
const nextParentType = nextParent ? toHierarchyType(nextParent.type) : null;
if (!canMoveToParent(componentType, nextParentType)) {
return components;
}
if (nextParentId && wouldCreateCycle(componentId, nextParentId, components, componentsById)) {
return components;
}
const currentParentId = resolveParentId(componentId, components, componentsById);
const currentChildren = currentParentId
? getOrderedChildIds(currentParentId, components, componentsById)
: [];
Iif (currentParentId && !currentChildren.includes(componentId)) {
return components;
}
const sameParent = currentParentId === nextParentId;
const sourceChildrenWithoutComponent = currentParentId
? currentChildren.filter((childId) => childId !== componentId)
: [];
const rootChildren = getOrderedRootIds(components, componentsById).filter(
(childId) => childId !== componentId,
);
const targetChildrenBeforeInsert = sameParent
? currentParentId
? sourceChildrenWithoutComponent
: rootChildren
: nextParentId
? getOrderedChildIds(nextParentId, components, componentsById).filter(
(childId) => childId !== componentId,
)
: rootChildren;
const insertionIndex = clampIndex(nextIndex, targetChildrenBeforeInsert.length);
const reorderedTargetChildren = [...targetChildrenBeforeInsert];
reorderedTargetChildren.splice(insertionIndex, 0, componentId);
const currentOrder = currentParentId ? currentChildren : getOrderedRootIds(components, componentsById);
const noReorderChange = sameParent && areEqualLists(currentOrder, reorderedTargetChildren);
if (noReorderChange && isAssignedToParent(component, nextParentId)) {
return components;
}
let didChange =
currentParentId === null &&
nextParentId === null &&
!areEqualLists(currentOrder, reorderedTargetChildren);
const updatedComponents = components.map((candidate) => {
if (candidate.id === componentId) {
if (isAssignedToParent(candidate, nextParentId)) {
return candidate;
}
didChange = true;
const nextCandidate = { ...candidate };
if (nextParentId) {
nextCandidate.parentId = nextParentId;
if (nextParent?.type === "Panel") {
nextCandidate.parentOffset = {
x: Math.round(nextCandidate.x - nextParent.x),
y: Math.round(nextCandidate.y - nextParent.y),
};
} else {
delete nextCandidate.parentOffset;
}
} else {
delete nextCandidate.parentId;
delete nextCandidate.parentOffset;
}
return nextCandidate;
}
if (nextParentId && candidate.id === nextParentId) {
Iif (areEqualLists(candidate.children ?? [], reorderedTargetChildren)) {
return candidate;
}
didChange = true;
return {
...candidate,
children: reorderedTargetChildren,
};
}
if (!sameParent && candidate.id === currentParentId) {
Iif (areEqualLists(candidate.children ?? [], sourceChildrenWithoutComponent)) {
return candidate;
}
didChange = true;
return {
...candidate,
children: sourceChildrenWithoutComponent,
};
}
return candidate;
});
Iif (!didChange) {
return components;
}
if (nextParentId) {
return updatedComponents;
}
const reorderedRootComponents = reorderedTargetChildren
.map((id) => updatedComponents.find((candidate) => candidate.id === id))
.filter((candidate): candidate is CanvasComponent => candidate !== undefined);
const reorderedRootIds = new Set(reorderedRootComponents.map((candidate) => candidate.id));
const nonRootComponents = updatedComponents.filter((candidate) => !reorderedRootIds.has(candidate.id));
const updatedComponentsById = new Map(updatedComponents.map((candidate) => [candidate.id, candidate]));
const rootInsertionIndexes = updatedComponents
.map((candidate, index) => ({ candidate, index }))
.filter(
({ candidate }) => resolveParentId(candidate.id, updatedComponents, updatedComponentsById) === null,
)
.map(({ index }) => index);
Iif (rootInsertionIndexes.length === 0) {
return updatedComponents;
}
const nextComponents = [...nonRootComponents];
for (const [rootOrderIndex, insertionIndex] of rootInsertionIndexes.entries()) {
const rootComponent = reorderedRootComponents[rootOrderIndex];
Iif (!rootComponent) {
continue;
}
nextComponents.splice(insertionIndex, 0, rootComponent);
}
return nextComponents;
}
export function useHierarchyDragDrop({
components,
onMoveComponent,
}: UseHierarchyDragDropOptions): UseHierarchyDragDropResult {
const [draggingComponentId, setDraggingComponentId] = useState<string | null>(null);
const [dropTarget, setDropTarget] = useState<HierarchyDropTarget | null>(null);
const componentsById = useMemo(
() => new Map(components.map((component) => [component.id, component])),
[components],
);
const isDraggableComponent = useCallback(
(componentId: string): boolean => {
const component = componentsById.get(componentId);
if (!component) {
return false;
}
return isMovableType(toHierarchyType(component.type));
},
[componentsById],
);
const resetDragState = useCallback(() => {
setDraggingComponentId(null);
setDropTarget(null);
}, []);
const handleDragStart = useCallback(
(event: React.DragEvent<HTMLElement>, componentId: string) => {
if (!isDraggableComponent(componentId)) {
event.preventDefault();
return;
}
event.dataTransfer.effectAllowed = "move";
event.dataTransfer.setData(HIERARCHY_DRAG_DATA_MIME, componentId);
event.dataTransfer.setData("text/plain", componentId);
setDraggingComponentId(componentId);
setDropTarget(null);
},
[isDraggableComponent],
);
const handleDragOver = useCallback(
(event: React.DragEvent<HTMLElement>, targetComponentId: string) => {
const draggedId = getDraggingId(event.dataTransfer) ?? draggingComponentId;
if (!draggedId) {
return;
}
const draggedComponent = componentsById.get(draggedId);
const targetComponent = componentsById.get(targetComponentId);
Iif (!draggedComponent || !targetComponent) {
return;
}
const resolvedDrop = resolveDropForEvent(
event,
draggedId,
targetComponentId,
components,
componentsById,
);
Iif (!resolvedDrop) {
setDropTarget(null);
return;
}
event.preventDefault();
event.dataTransfer.dropEffect = "move";
setDropTarget((previous) => {
Iif (
previous?.componentId === targetComponentId &&
previous.position === resolvedDrop.position
) {
return previous;
}
return {
componentId: targetComponentId,
position: resolvedDrop.position,
};
});
},
[components, componentsById, draggingComponentId],
);
const handleDrop = useCallback(
(event: React.DragEvent<HTMLElement>, targetComponentId: string) => {
const draggedId = getDraggingId(event.dataTransfer) ?? draggingComponentId;
Iif (!draggedId) {
resetDragState();
return;
}
const draggedComponent = componentsById.get(draggedId);
const targetComponent = componentsById.get(targetComponentId);
Iif (!draggedComponent || !targetComponent) {
resetDragState();
return;
}
const resolvedDrop = resolveDropForEvent(
event,
draggedId,
targetComponentId,
components,
componentsById,
);
Iif (!resolvedDrop) {
resetDragState();
return;
}
event.preventDefault();
onMoveComponent(draggedId, resolvedDrop.instruction.parentId, resolvedDrop.instruction.index);
resetDragState();
},
[components, componentsById, draggingComponentId, onMoveComponent, resetDragState],
);
const handleDragEnd = useCallback(() => {
resetDragState();
}, [resetDragState]);
return {
draggingComponentId,
dropTarget,
isDraggableComponent,
handleDragStart,
handleDragOver,
handleDrop,
handleDragEnd,
};
}
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