[Draft] feat: ew browse view

blocks/canvas/canvas.css

@@ -0,0 +1,57 @@
+:root {
+  --ew-canvas-header-height: 48px;
+}
+
+html:has(aside.panel[data-position="before"]:not([hidden])) ew-canvas-header::part(toggle-before) {
+  display: none;
+}
+
+html:has(aside.panel[data-position="after"]:not([hidden])) ew-canvas-header::part(toggle-after) {
+  display: none;
+}
+
+.fragment-content:has(nx-chat) {
+  height: 100%;
+
+  & .section {
+    height: 100%;
+  }
+
+  & .block-content {
+    height: 100%;
+  }
+}
+
+nx-chat {
+  height: 100%;
+}
+
+/* Layout / content / split: one visible editor set; split uses WYSIWYG | gutter | doc; inactive uses [hidden] */
+.nx-canvas-editor-mount {
+  display: flex;
+  flex-direction: column;
+  flex: 1;
+  min-height: 0;
+  gap: 0;
+  height: calc(100vh - var(--ew-canvas-header-height) - var(--s2-nav-height));
+}
+
+ew-editor-doc {
+  display: block;
+  flex: 1;
+  min-height: 0;
+  max-height: calc(100vh - var(--ew-canvas-header-height) - var(--s2-nav-height));
+  overflow-y: auto;
+}
+
+ew-editor-wysiwyg,
+ew-editor-doc {
+  contain: layout;
+  overflow: hidden;
+}
+
+ew-editor-doc[hidden],
+ew-editor-wysiwyg[hidden] {
+  display: none !important;
+}
+

blocks/canvas/canvas.js

@@ -0,0 +1,232 @@
+import { getNx } from '../../scripts/utils.js';
+import { editorSelectChange } from './editor-utils/editor-utils.js';
+import './ew-canvas-header/ew-canvas-header.js';
+import './ew-editor-doc/ew-editor-doc.js';
+import './ew-editor-wysiwyg/ew-editor-wysiwyg.js';
+import {
+  syncEditorSplitLayout,
+  finalizeSplitEditorMountOrder,
+  installEditorSplitDrag,
+  removeSplitGutter,
+} from './ew-editor-split/ew-editor-split.js';
+
+const { loadStyle, hashChange } = await import(`${getNx()}/utils/utils.js`);
+const { getPanelStore, openPanel } = await import(`${getNx()}/utils/panel.js`);
+
+const style = await loadStyle(import.meta.url);
+document.adoptedStyleSheets = [...document.adoptedStyleSheets, style];
+
+function buildCanvasDocPath(state) {
+  const { org, site, path } = state || {};
+  if (!org || !site || !path) return null;
+  return `${org}/${site}/${path}`;
+}
+
+const CANVAS_EDITOR_VIEW_KEY = 'nx-canvas-editor-view';
+
+function normalizeCanvasEditorView(view) {
+  if (view === 'content') return 'content';
+  if (view === 'split') return 'split';
+  return 'layout';
+}
+
+function notifyCanvasEditorActive(mountRoot, view) {
+  const v = normalizeCanvasEditorView(view);
+  mountRoot.dispatchEvent(new CustomEvent('nx-canvas-editor-active', {
+    bubbles: false,
+    detail: { view: v },
+  }));
+}
+
+function readPersistedCanvasEditorView() {
+  try {
+    return normalizeCanvasEditorView(sessionStorage.getItem(CANVAS_EDITOR_VIEW_KEY));
+  } catch {
+    return 'layout';
+  }
+}
+
+function persistCanvasEditorView(view) {
+  try {
+    sessionStorage.setItem(CANVAS_EDITOR_VIEW_KEY, normalizeCanvasEditorView(view));
+  } catch {
+    /* ignore if browser disallows session storage */
+  }
+}
+
+function canvasEditorMountRoot(block) {
+  return block.querySelector('.default-content') || block;
+}
+
+function canvasHeaderApplyTarget(block) {
+  return block.querySelector('.nx-canvas-editor-mount')
+    || block.querySelector('.default-content')
+    || block;
+}
+
+function removeCanvasEditors(mountRoot) {
+  removeSplitGutter(mountRoot);
+  mountRoot.querySelector('ew-editor-doc')?.remove();
+  mountRoot.querySelector('ew-editor-wysiwyg')?.remove();
+}
+
+function ensureNxEditorDoc(mountRoot) {
+  let el = mountRoot.querySelector('ew-editor-doc');
+  if (!el) {
+    el = document.createElement('ew-editor-doc');
+    mountRoot.append(el);
+  }
+  return el;
+}
+
+function ensureNxEditorWysiwyg(mountRoot) {
+  let frame = mountRoot.querySelector('ew-editor-wysiwyg');
+  if (!frame) {
+    frame = document.createElement('ew-editor-wysiwyg');
+    mountRoot.append(frame);
+  }
+  return frame;
+}
+
+function editorCtxFromHashState(state, fullPath) {
+  return { org: state.org, repo: state.site, path: fullPath };
+}
+
+function syncCanvasEditorsToHash({ mountRoot, header, state }) {
+  header.undoAvailable = false;
+  header.redoAvailable = false;
+  const fullPath = buildCanvasDocPath(state);
+  if (!fullPath) {
+    removeCanvasEditors(mountRoot);
+    return;
+  }
+  const ctx = editorCtxFromHashState(state, fullPath);
+  ensureNxEditorWysiwyg(mountRoot).ctx = ctx;
+  ensureNxEditorDoc(mountRoot).ctx = ctx;
+  finalizeSplitEditorMountOrder(mountRoot);
+  notifyCanvasEditorActive(mountRoot, header.editorView);
+  syncEditorSplitLayout({ mountRoot, view: header.editorView });
+}
+
+async function syncToolPanelViews(toolPanel, { org, site }) {
+  const key = org && site ? `${org}/${site}` : null;
+  if (key === toolPanel.dataset.extKey) return;
+  toolPanel.dataset.extKey = key ?? '';
+
+  if (!key) {
+    toolPanel.views = [];
+    return;
+  }
+
+  const { getCanvasToolPanelViews } = await import('./ew-panel-extensions/helpers.js');
+  const views = await getCanvasToolPanelViews({ org, site });
+  if (toolPanel.dataset.extKey !== key) return;
+  toolPanel.views = views;
+}
+
+const CANVAS_PANELS = {
+  before: {
+    width: '400px',
+    getContent: async () => {
+      await import(`${getNx()}/blocks/chat/chat.js`);
+      return document.createElement('nx-chat');
+    },
+  },
+  after: {
+    width: '400px',
+    getContent: async () => {
+      await import('./ew-tool-panel/tool-panel.js');
+      return document.createElement('ew-tool-panel');
+    },
+  },
+};
+
+function hashState() {
+  const [org, site] = window.location.hash.slice(2).split('/');
+  return { org: org || undefined, site: site || undefined };
+}
+
+async function openCanvasPanel(position, { preferredViewId } = {}) {
+  const config = CANVAS_PANELS[position];
+  if (!config) return;
+  const store = getPanelStore();
+  const width = store[position]?.width ?? config.width;
+  const aside = await openPanel({ position, width, getContent: config.getContent });
+  if (position === 'after') {
+    const toolPanel = aside?.querySelector('ew-tool-panel');
+    if (toolPanel) {
+      await syncToolPanelViews(toolPanel, hashState());
+      await toolPanel.updateComplete;
+      if (preferredViewId && toolPanel.views?.some((v) => v.id === preferredViewId)) {
+        await toolPanel.showView(preferredViewId);
+      }
+    }
+  }
+}
+
+function installCanvasHeader(block) {
+  const header = document.createElement('ew-canvas-header');
+  header.editorView = readPersistedCanvasEditorView();
+  header.addEventListener('nx-canvas-open-panel', (e) => {
+    openCanvasPanel(e.detail.position, { preferredViewId: e.detail.viewId });
+  });
+  header.addEventListener('nx-canvas-editor-view', (e) => {
+    const view = normalizeCanvasEditorView(e.detail?.view);
+    persistCanvasEditorView(view);
+    const applyTarget = canvasHeaderApplyTarget(block);
+    notifyCanvasEditorActive(applyTarget, view);
+    syncEditorSplitLayout({ mountRoot: canvasEditorMountRoot(block), view });
+  });
+  header.addEventListener('nx-canvas-undo', () => {
+    canvasEditorMountRoot(block).querySelector('ew-editor-doc')?.undo();
+  });
+  header.addEventListener('nx-canvas-redo', () => {
+    canvasEditorMountRoot(block).querySelector('ew-editor-doc')?.redo();
+  });
+  block.before(header);
+  return header;
+}
+
+export default async function decorate(block) {
+  const header = installCanvasHeader(block);
+
+  const mountRoot = canvasEditorMountRoot(block);
+  mountRoot.classList.add('nx-canvas-editor-mount');
+  syncEditorSplitLayout({ mountRoot, view: header.editorView });
+  installEditorSplitDrag(mountRoot);
+
+  mountRoot.addEventListener('nx-editor-undo-state', (e) => {
+    header.undoAvailable = e.detail?.canUndo ?? false;
+    header.redoAvailable = e.detail?.canRedo ?? false;
+  });
+
+  hashChange.subscribe((state) => {
+    syncCanvasEditorsToHash({ mountRoot, header, state });
+    const toolPanel = document.querySelector('aside.panel[data-position="after"] ew-tool-panel');
+    if (toolPanel) syncToolPanelViews(toolPanel, state);
+  });
+
+  const store = getPanelStore();
+  if (store.before && !store.before.fragment) openCanvasPanel('before');
+  if (store.after && !store.after.fragment) openCanvasPanel('after');
+
+  // Only NodeSelection (explicit block handle click) in doc mode qualifies as intentional context.
+  // wysiwyg has no block-select equivalent yet — see docs/canvas-events.md.
+  const CANVAS_CHAT_KEY = 'canvas-selection';
+  editorSelectChange.subscribe(({
+    blockIndex, blockName, proseIndex, innerText, source, explicit,
+  }) => {
+    if (source !== 'doc' || !explicit) return;
+    const detail = blockIndex >= 0 && blockName
+      ? {
+        key: CANVAS_CHAT_KEY,
+        id: CANVAS_CHAT_KEY,
+        label: blockName,
+        blockName,
+        proseIndex,
+        innerText,
+      }
+      : { key: CANVAS_CHAT_KEY };
+    document.dispatchEvent(new CustomEvent('nx-add-to-chat', { detail }));
+  });
+}

blocks/canvas/editor-utils/blocks.js

@@ -0,0 +1,107 @@
+function getTableBlockName(tableNode) {
+  const firstRow = tableNode.firstChild;
+  if (!firstRow) return '';
+  const firstCell = firstRow.firstChild;
+  if (!firstCell) return '';
+  const raw = firstCell.textContent?.trim() ?? '';
+  const match = raw.match(/^([a-zA-Z0-9_\s-]+)(?:\s*\([^)]*\))?$/);
+  return match ? match[1].trim().toLowerCase() : raw.toLowerCase();
+}
+
+function isSamePosition(from, to, dropPosition) {
+  return from === to || (to === from + 1 && dropPosition === 'before')
+    || (to === from - 1 && dropPosition === 'after');
+}
+
+export function getBlockPositions(view) {
+  if (!view?.state?.doc) return [];
+  const positions = [];
+  const { doc } = view.state;
+  doc.descendants((node, pos) => {
+    if (node.type.name === 'table') {
+      const blockName = getTableBlockName(node);
+      if (blockName === 'metadata') return;
+      positions.push(pos);
+    }
+  });
+  return positions;
+}
+
+export function getActiveBlockIndex(view) {
+  if (!view?.state) return -1;
+  const { state } = view;
+  const cursorPos = state.selection.from;
+  const positions = getBlockPositions(view);
+  for (let i = 0; i < positions.length; i += 1) {
+    const start = positions[i];
+    const node = state.doc.nodeAt(start);
+    if (node && cursorPos >= start && cursorPos < start + node.nodeSize) return i;
+  }
+  return -1;
+}
+
+export function moveBlock(view, fromIndex, toIndex, dropPosition) {
+  if (!view) return;
+  if (isSamePosition(fromIndex, toIndex, dropPosition)) return;
+
+  const { doc } = view.state;
+  const positions = getBlockPositions(view);
+
+  if (fromIndex >= positions.length || toIndex >= positions.length) return;
+
+  const fromBlockPos = positions[fromIndex];
+  const fromBlockNode = doc.nodeAt(fromBlockPos);
+  const toBlockPos = positions[toIndex];
+  const toBlockNode = doc.nodeAt(toBlockPos);
+
+  if (!fromBlockNode || !toBlockNode) return;
+
+  const fromBlockSize = fromBlockNode.nodeSize;
+  const toBlockSize = toBlockNode.nodeSize;
+
+  const insertPos = dropPosition === 'before'
+    ? toBlockPos
+    : toBlockPos + toBlockSize;
+  const adjustedInsertPos = insertPos > fromBlockPos
+    ? insertPos - fromBlockSize
+    : insertPos;
+
+  view.dispatch(
+    view.state.tr
+      .delete(fromBlockPos, fromBlockPos + fromBlockSize)
+      .insert(adjustedInsertPos, fromBlockNode),
+  );
+}
+
+export function moveSection(view, fromSectionIndex, toSectionIndex, dropPosition) {
+  if (!view) return;
+  if (isSamePosition(fromSectionIndex, toSectionIndex, dropPosition)) return;
+
+  const { doc, schema } = view.state;
+
+  const sections = [[]];
+  doc.forEach((node) => {
+    if (node.type === schema.nodes.horizontal_rule) {
+      sections.push([]);
+    } else {
+      sections[sections.length - 1].push(node);
+    }
+  });
+
+  if (fromSectionIndex >= sections.length || toSectionIndex >= sections.length) return;
+
+  const reordered = [...sections];
+  const [moved] = reordered.splice(fromSectionIndex, 1);
+  let insertIdx = dropPosition === 'before' ? toSectionIndex : toSectionIndex + 1;
+  if (insertIdx > fromSectionIndex) insertIdx -= 1;
+  reordered.splice(insertIdx, 0, moved);
+
+  const hrNode = schema.nodes.horizontal_rule.create();
+  const newNodes = [];
+  reordered.forEach((sectionNodes, i) => {
+    if (i > 0) newNodes.push(hrNode);
+    newNodes.push(...sectionNodes);
+  });
+
+  view.dispatch(view.state.tr.replaceWith(0, doc.content.size, newNodes));
+}