Initial version
This commit is contained in:
476
tp-tree-nav.js
Normal file
476
tp-tree-nav.js
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@@ -0,0 +1,476 @@
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/**
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@license
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Copyright (c) 2025 trading_peter
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This program is available under Apache License Version 2.0
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*/
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import { LitElement, html, css, svg } from 'lit';
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import { virtualize } from '@lit-labs/virtualizer/virtualize.js';
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class TpTreeNav extends LitElement {
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static get styles() {
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return [
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css`
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:host {
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display: block;
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position: relative;
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--tp-tree-indent: 16px;
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--tp-tree-row-height: 28px;
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}
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.tree {
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width: 100%;
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height: 100%;
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}
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.row {
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display: flex;
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align-items: center;
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height: var(--tp-tree-row-height);
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box-sizing: border-box;
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padding: 0 8px;
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cursor: default;
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user-select: none;
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}
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.row:hover {
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background: var(--tp-tree-hover-bg, rgba(0,0,0,0.04));
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}
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.row:active {
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background: var(--tp-tree-active-bg, rgba(0,0,0,0.06));
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}
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.indent {
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width: calc(var(--tp-tree-indent) * var(--depth));
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flex: 0 0 auto;
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}
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.chevron-btn {
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width: 24px;
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height: 24px;
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display: flex;
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align-items: center;
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justify-content: center;
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flex: 0 0 auto;
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cursor: pointer;
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transition: transform 120ms ease;
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}
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.chevron-btn[hidden] {
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visibility: hidden;
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}
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.chevron-btn.expanded {
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transform: rotate(90deg);
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}
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.icon {
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margin-right: 6px;
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width: 18px;
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height: 18px;
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flex: 0 0 auto;
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}
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.label {
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flex: 1 1 auto;
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overflow: hidden;
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text-overflow: ellipsis;
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white-space: nowrap;
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}
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.context-menu-overlay {
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position: absolute;
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inset: 0;
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pointer-events: none;
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}
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.context-menu {
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position: absolute;
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min-width: 180px;
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background: var(--tp-tree-menu-bg, #fff);
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color: inherit;
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border: 1px solid var(--tp-tree-menu-border, rgba(0,0,0,0.1));
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border-radius: 6px;
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box-shadow: 0 6px 18px rgba(0,0,0,0.18);
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padding: 4px 0;
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pointer-events: auto;
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z-index: 10;
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}
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.menu-item {
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width: 100%;
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display: flex;
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align-items: center;
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gap: 8px;
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background: none;
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border: none;
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padding: 8px 12px;
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cursor: pointer;
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text-align: left;
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box-sizing: border-box;
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font: inherit;
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}
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.menu-item:hover {
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background: var(--tp-tree-menu-hover-bg, rgba(0,0,0,0.06));
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}
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.menu-icon {
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width: 16px;
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height: 16px;
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flex: 0 0 auto;
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}
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`
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];
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}
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render() {
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const items = this._flattenNodes();
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return html`
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<div class="tree">
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${virtualize({
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items,
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renderItem: (item) => this._renderItem(item),
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keyFunction: (item) => item.key,
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})}
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</div>
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${this._renderContextMenu()}
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`;
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}
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static get properties() {
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return {
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roots: { type: Array },
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defaultActions: { type: Array },
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renderNode: { type: Function },
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beforeContextMenu: { type: Function },
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};
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}
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static get chevron() {
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return svg`<path fill="var(--tp-icon-color)" d="M8.59,16.58L13.17,12L8.59,7.41L10,6L16,12L10,18L8.59,16.58Z" />`;
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}
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static get folder() {
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return svg`<path fill="var(--tp-icon-color)" d="M10,4H4C2.89,4 2,4.89 2,6V18A2,2 0 0,0 4,20H20A2,2 0 0,0 22,18V8C22,6.89 21.1,6 20,6H12L10,4Z" />`;
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}
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static get file() {
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return svg`<path fill="var(--tp-icon-color)" d="M13,9V3.5L18.5,9M6,2C4.89,2 4,2.89 4,4V20A2,2 0 0,0 6,22H18A2,2 0 0,0 20,20V8L14,2H6Z" />`;
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}
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static get defaultIcons() {
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return {
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chevron: TpTreeNav.chevron,
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folder: TpTreeNav.folder,
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file: TpTreeNav.file,
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};
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}
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constructor() {
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super();
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this.roots = [];
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this.defaultActions = [];
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this.renderNode = null;
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this.beforeContextMenu = null;
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this._contextMenu = null;
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this._outsideHandler = null;
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this._keyHandler = null;
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}
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disconnectedCallback() {
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super.disconnectedCallback();
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this._removeOutsideHandlers();
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}
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_flattenNodes() {
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const results = [];
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const roots = Array.isArray(this.roots) ? this.roots : [];
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const walk = (nodes, depth, path) => {
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if (!Array.isArray(nodes)) return;
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nodes.forEach((node, index) => {
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const slug = node?.slug ?? `${index}`;
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const nextPath = [...path, slug];
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const states = Array.isArray(node?.states) ? node.states : [];
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const hasChildren = Array.isArray(node?.children) && node.children.length > 0;
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const expanded = states.includes('expanded');
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results.push({
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node,
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depth,
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path: nextPath,
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hasChildren,
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expanded,
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key: nextPath.join('/'),
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});
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if (hasChildren && expanded) {
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walk(node.children, depth + 1, nextPath);
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}
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});
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};
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walk(roots, 0, []);
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return results;
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}
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_renderItem(item) {
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const { node, depth, hasChildren, expanded } = item;
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const icon = this._resolveIcon(node?.icon);
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const custom = this.renderNode?.(node, {
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depth,
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states: Array.isArray(node?.states) ? node.states : [],
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path: item.path,
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hasChildren,
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});
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if (custom) {
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return custom;
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}
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return html`
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<div
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class="row"
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part="row"
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style="--depth: ${depth}"
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@click=${(e) => this._onRowClick(item, e)}
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@contextmenu=${(e) => this._onContextMenu(item, e)}
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>
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<div class="indent"></div>
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<div
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class="chevron-btn ${expanded ? 'expanded' : ''}"
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part="chevron"
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?hidden=${!hasChildren}
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@click=${(e) => this._onChevronClick(item, e)}
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>
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<tp-icon class="icon" part="chevron-icon" .icon=${TpTreeNav.chevron}></tp-icon>
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</div>
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${icon ? html`<tp-icon class="icon" part="icon" .icon=${icon}></tp-icon>` : html`<span class="icon" part="icon" aria-hidden="true"></span>`}
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<div class="label" part="label">${node?.label ?? ''}</div>
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</div>
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`;
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}
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_onRowClick(item, originalEvent) {
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const ev = new CustomEvent('node-click', {
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detail: { node: item.node, path: item.path, originalEvent },
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bubbles: true,
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composed: true,
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cancelable: true,
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});
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this.dispatchEvent(ev);
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}
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_onChevronClick(item, originalEvent) {
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originalEvent.stopPropagation();
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this._dispatchAction('toggle', item, 'chevron', originalEvent);
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}
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async _onContextMenu(item, originalEvent) {
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originalEvent.preventDefault();
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const contextEvent = new CustomEvent('node-context', {
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detail: { node: item.node, path: item.path, originalEvent },
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bubbles: true,
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composed: true,
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cancelable: true,
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});
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this.dispatchEvent(contextEvent);
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if (contextEvent.defaultPrevented) return;
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const baseActions = this._mergeActions(
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this.defaultActions,
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this._normalizeActions(item.node?.actions)
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);
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const maybeModified = this.beforeContextMenu
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? this.beforeContextMenu(item.node, baseActions)
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: baseActions;
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const actions = await Promise.resolve(maybeModified);
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if (actions === false) return;
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const rect = this.getBoundingClientRect();
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const x = originalEvent.clientX - rect.left;
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const y = originalEvent.clientY - rect.top;
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this._contextMenu = { x, y, item, actions: Array.isArray(actions) ? actions : baseActions };
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this.requestUpdate();
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this._attachOutsideHandlers();
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}
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_dispatchAction(action, item, source, originalEvent) {
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const ev = new CustomEvent('node-action', {
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detail: { action, node: item.node, path: item.path, source, originalEvent },
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bubbles: true,
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composed: true,
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cancelable: true,
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});
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this.dispatchEvent(ev);
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}
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_renderContextMenu() {
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if (!this._contextMenu) return null;
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const { x, y, item, actions } = this._contextMenu;
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return html`
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<div class="context-menu-overlay">
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<div class="context-menu" part="context-menu" style="left:${x}px; top:${y}px;">
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${actions.map((action) => html`
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<button
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class="menu-item"
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part="context-menu-item"
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@click=${(e) => this._onMenuAction(action, item, e)}
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>
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${action?.icon ? html`<tp-icon class="menu-icon" part="context-menu-icon" .icon=${this._resolveIcon(action.icon)}></tp-icon>` : html`<span class="menu-icon" part="context-menu-icon" aria-hidden="true"></span>`}
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<span>${action?.label ?? ''}</span>
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</button>
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`)}
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</div>
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</div>
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`;
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}
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_onMenuAction(action, item, originalEvent) {
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originalEvent.stopPropagation();
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this._dispatchAction(action?.action, item, 'context-menu', originalEvent);
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this._closeContextMenu();
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}
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_attachOutsideHandlers() {
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if (this._outsideHandler) return;
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this._outsideHandler = (e) => {
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const menu = this.shadowRoot?.querySelector('.context-menu');
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if (menu && e.composedPath().includes(menu)) return;
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this._closeContextMenu();
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};
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this._keyHandler = (e) => {
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if (e.key === 'Escape') {
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this._closeContextMenu();
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}
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};
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window.addEventListener('pointerdown', this._outsideHandler, true);
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window.addEventListener('keydown', this._keyHandler, true);
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}
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_removeOutsideHandlers() {
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if (this._outsideHandler) {
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window.removeEventListener('pointerdown', this._outsideHandler, true);
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this._outsideHandler = null;
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}
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if (this._keyHandler) {
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window.removeEventListener('keydown', this._keyHandler, true);
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this._keyHandler = null;
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}
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}
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_closeContextMenu() {
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this._contextMenu = null;
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this.requestUpdate();
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this._removeOutsideHandlers();
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}
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_normalizeActions(actions) {
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if (!actions) return [];
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if (Array.isArray(actions)) return actions;
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if (typeof actions === 'object') return Object.values(actions);
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return [];
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}
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_mergeActions(defaults = [], nodeActions = []) {
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const map = new Map();
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const add = (list) => {
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list?.forEach((a) => {
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if (a && a.action) {
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map.set(a.action, a);
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}
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});
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};
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add(defaults);
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add(nodeActions);
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return Array.from(map.values());
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}
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_resolveIcon(icon) {
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if (!icon) return null;
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if (typeof icon === 'string') {
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return TpTreeNav.defaultIcons[icon] ?? null;
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}
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return icon;
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}
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getNodesWithState(state) {
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const matches = [];
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this._walkNodes(this.roots, [], (node, path) => {
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if (Array.isArray(node?.states) && node.states.includes(state)) {
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matches.push({ node, path });
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}
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});
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return matches;
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}
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clearState(state) {
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const { nodes } = this._mapTree(this.roots, (node) => {
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const states = Array.isArray(node?.states)
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? node.states.filter((s) => s !== state)
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: [];
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const changed = (node.states?.length ?? 0) !== states.length;
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return changed ? { ...node, states } : node;
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});
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return nodes;
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}
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applyStateIf(state, predicate) {
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if (typeof predicate !== 'function') return this.roots;
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const { nodes } = this._mapTree(this.roots, (node, path) => {
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const states = Array.isArray(node?.states) ? [...node.states] : [];
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if (predicate(node, path) && !states.includes(state)) {
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states.push(state);
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return { ...node, states };
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}
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return node;
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});
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return nodes;
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}
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_walkNodes(nodes, path, visitor) {
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if (!Array.isArray(nodes)) return;
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nodes.forEach((node, index) => {
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const slug = node?.slug ?? `${index}`;
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const nextPath = [...path, slug];
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visitor(node, nextPath);
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if (Array.isArray(node?.children) && node.children.length) {
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this._walkNodes(node.children, nextPath, visitor);
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}
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});
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}
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_mapTree(nodes, mapper, path = []) {
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if (!Array.isArray(nodes)) return { nodes: [], changed: false };
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let changed = false;
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const mapped = nodes.map((node, index) => {
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const slug = node?.slug ?? `${index}`;
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const nextPath = [...path, slug];
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const mappedNode = mapper(node, nextPath) ?? node;
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const { nodes: childNodes, changed: childChanged } = this._mapTree(
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node?.children,
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mapper,
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nextPath
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);
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const children = childChanged ? childNodes : node?.children;
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const nodeChanged = mappedNode !== node || childChanged;
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if (nodeChanged) {
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changed = true;
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return { ...mappedNode, children };
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}
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return mappedNode;
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});
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return { nodes: mapped, changed };
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}
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}
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window.customElements.define('tp-tree-nav', TpTreeNav);
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