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