schlechtenburg/packages/core/lib/use-block-tree.ts

69 lines
1.6 KiB
TypeScript

import {
Ref,
reactive,
inject,
provide,
onUnmounted,
} from 'vue';
import {
BlockTree,
Block,
} from './blocks';
export const BlockTreeSym = Symbol('Schlechtenburg block tree');
export const BlockTreeRegister = Symbol('Schlechtenburg block tree');
export const BlockTreeUnregister = Symbol('Schlechtenburg block tree');
export function useBlockTree() {
const blockTree: Ref<BlockTree|null> = inject(BlockTreeSym, null);
const registerWithParent = inject(BlockTreeRegister, (_: BlockTree) => {});
const unregisterWithParent = inject(BlockTreeUnregister, (_: BlockTree) => {});
const self: BlockTree= reactive({
id: '',
name: '',
icon: '',
children: [],
});
// Provide a registration function to child blocks
provide(BlockTreeRegister, (block: BlockTree) => {
if (self.children.find((child: BlockTree) => child.id === block.id)) {
return;
}
self.children = [
...self.children,
block,
];
});
// Provide an unregistration function to child blocks
provide(BlockTreeUnregister, ({ id }: BlockTree) => {
self.children = self.children.filter((child: BlockTree) => child.id !== id);
});
const register = (block: Block) => {
if (!block.id) {
throw new Error(`Cannot register a block without an id: ${JSON.stringify(block)}`);
}
self.id = block.id;
self.name = block.name;
// Register ourselves at the parent block
registerWithParent(self);
}
// Unregister from parent when we get destroyed
onUnmounted(() => {
if (self.id) {
unregisterWithParent(self);
}
});
return {
blockTree,
register,
};
}