90 lines
3.2 KiB
JavaScript
90 lines
3.2 KiB
JavaScript
import { createElement, hydrate, render, __u as _unmount } from 'preact';
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function ContextProvider(props) {
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this.getChildContext = () => props.context;
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return props.children;
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}
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/**
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* Portal component
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* @param {object | null | undefined} props
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*
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* TODO: this could use the "fake root node" trick from the partial hydration demo
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*/
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function Portal(props) {
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const _this = this;
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let container = props._container;
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let wrap = createElement(
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ContextProvider,
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{ context: _this.context },
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props._vnode
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);
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_this.componentWillUnmount = function() {
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let parent = _this._temp.parentNode;
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if (parent) parent.removeChild(_this._temp);
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_unmount(_this._wrap);
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};
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// When we change container we should clear our old container and
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// indicate a new mount.
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if (_this._container && _this._container !== container) {
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_this.componentWillUnmount();
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// if (_this._temp.parentNode) _this._container.removeChild(_this._temp);
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// _unmount(_this._wrap);
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_this._hasMounted = false;
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}
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// When props.vnode is undefined/false/null we are dealing with some kind of
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// conditional vnode. This should not trigger a render.
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if (props._vnode) {
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if (!_this._hasMounted) {
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// Create a placeholder that we can use to insert into.
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_this._temp = document.createTextNode('');
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// temporarily store the current children of the container to restore them after render
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_this._children = container._children;
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// Hydrate existing nodes to keep the dom intact, when rendering
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// wrap into the container.
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hydrate('', container);
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// Append to the container (this matches React's behavior)
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container.appendChild(_this._temp);
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// At this point we have mounted and should set our container.
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_this._hasMounted = true;
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_this._container = container;
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// Render our wrapping element into temp.
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render(wrap, container, _this._temp);
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// restore the previous children of the container
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container._children = _this._children;
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// store the children of the new vnode to be used in subsequent re-renders
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_this._children = _this._temp._children;
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} else {
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// When we have mounted and the vnode is present it means the
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// props have changed or a parent is triggering a rerender.
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// This implies we only need to call render. But we need to keep
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// the old tree around, otherwise will treat the vnodes as new and
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// will wrongly call `componentDidMount` on them
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container._children = _this._children;
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render(wrap, container);
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_this._children = container._children;
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}
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}
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// When we come from a conditional render, on a mounted
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// portal we should clear the DOM.
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else if (_this._hasMounted) {
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_this.componentWillUnmount();
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// if (_this._temp.parentNode) _this._container.removeChild(_this._temp);
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// _unmount(_this._wrap);
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}
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// Set the wrapping element for future unmounting.
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_this._wrap = wrap;
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}
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/**
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* Create a `Portal` to continue rendering the vnode tree at a different DOM node
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* @param {import('./internal').VNode} vnode The vnode to render
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* @param {import('./internal').PreactElement} container The DOM node to continue rendering in to.
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*/
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export function createPortal(vnode, container) {
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return createElement(Portal, { _vnode: vnode, _container: container });
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}
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