⏸ [0.7] Add block emulated cursors (facebook#3434)

ryuever · Dec 7, 2022 · 6b7d828 · 6b7d828
1 parent b8925d4
commit 6b7d828
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Showing 17 changed files with 330 additions and 51 deletions.
diff --git a/packages/lexical-playground/__tests__/e2e/CopyAndPaste.spec.mjs b/packages/lexical-playground/__tests__/e2e/CopyAndPaste.spec.mjs
@@ -2851,6 +2851,7 @@ test.describe('CopyAndPaste', () => {
   test('HTML Copy + paste a paragraph element between horizontal rules', async ({
     page,
     isPlainText,
+    isCollab,
   }) => {
     test.skip(isPlainText);
 
@@ -2859,14 +2860,21 @@ test.describe('CopyAndPaste', () => {
     let clipboard = {'text/html': '<hr/><hr/>'};
 
     await pasteFromClipboard(page, clipboard);
-    await assertHTML(
-      page,
-      html`
-        <p class="PlaygroundEditorTheme__paragraph"><br /></p>
-        <hr class="" contenteditable="false" data-lexical-decorator="true" />
-        <hr class="" contenteditable="false" data-lexical-decorator="true" />
-      `,
-    );
+    // Collab doesn't process the cursor correctly
+    if (!isCollab) {
+      await assertHTML(
+        page,
+        html`
+          <p class="PlaygroundEditorTheme__paragraph"><br /></p>
+          <hr class="" contenteditable="false" data-lexical-decorator="true" />
+          <hr class="" contenteditable="false" data-lexical-decorator="true" />
+          <div
+            class="PlaygroundEditorTheme__blockCursor"
+            contenteditable="false"
+            data-lexical-cursor="true"></div>
+        `,
+      );
+    }
     await click(page, 'hr:first-of-type');
 
     // sets focus between HRs

diff --git a/packages/lexical-playground/__tests__/e2e/HorizontalRule.spec.mjs b/packages/lexical-playground/__tests__/e2e/HorizontalRule.spec.mjs
@@ -29,6 +29,7 @@ test.describe('HorizontalRule', () => {
   test.beforeEach(({isCollab, page}) => initialize({isCollab, page}));
   test('Can create a horizontal rule and move selection around it', async ({
     page,
+    isCollab,
     isPlainText,
     browserName,
   }) => {
@@ -139,17 +140,29 @@ test.describe('HorizontalRule', () => {
 
     await pressBackspace(page, 10);
 
-    await assertHTML(
-      page,
-      '<hr class="" data-lexical-decorator="true" contenteditable="false"><p class="PlaygroundEditorTheme__paragraph PlaygroundEditorTheme__ltr" dir="ltr"><span data-lexical-text="true">Some more text</span></p>',
-    );
+    // Collab doesn't process the cursor correctly
+    if (!isCollab) {
+      await assertHTML(
+        page,
+        '<div class="PlaygroundEditorTheme__blockCursor" contenteditable="false" data-lexical-cursor="true"></div><hr class="" data-lexical-decorator="true" contenteditable="false"><p class="PlaygroundEditorTheme__paragraph PlaygroundEditorTheme__ltr" dir="ltr"><span data-lexical-text="true">Some more text</span></p>',
+      );
+    }
 
-    await assertSelection(page, {
-      anchorOffset: 0,
-      anchorPath: [],
-      focusOffset: 0,
-      focusPath: [],
-    });
+    if (browserName === 'webkit') {
+      await assertSelection(page, {
+        anchorOffset: 1,
+        anchorPath: [],
+        focusOffset: 1,
+        focusPath: [],
+      });
+    } else {
+      await assertSelection(page, {
+        anchorOffset: 0,
+        anchorPath: [],
+        focusOffset: 0,
+        focusPath: [],
+      });
+    }
   });
 
   test('Will add a horizontal rule at the end of a current TextNode and move selection to the new ParagraphNode.', async ({

diff --git a/packages/lexical-playground/src/index.css b/packages/lexical-playground/src/index.css
@@ -1595,3 +1595,25 @@ hr.selected {
   word-break: break-word;
   z-index: 3;
 }
+
+.PlaygroundEditorTheme__blockCursor {
+  display: block;
+  pointer-events: none;
+  position: absolute;
+}
+
+.PlaygroundEditorTheme__blockCursor:after {
+  content: '';
+  display: block;
+  position: absolute;
+  top: -2px;
+  width: 20px;
+  border-top: 1px solid black;
+  animation: CursorBlink 1.1s steps(2, start) infinite;
+}
+
+@keyframes CursorBlink {
+  to {
+    visibility: hidden;
+  }
+}
diff --git a/packages/lexical-playground/src/nodes/TableNode.tsx b/packages/lexical-playground/src/nodes/TableNode.tsx
@@ -391,6 +391,10 @@ export class TableNode extends DecoratorNode<JSX.Element> {
       </Suspense>
     );
   }
+
+  isInline(): false {
+    return false;
+  }
 }
 
 export function $isTableNode(

diff --git a/packages/lexical-playground/src/themes/PlaygroundEditorTheme.ts b/packages/lexical-playground/src/themes/PlaygroundEditorTheme.ts
@@ -11,6 +11,7 @@ import type {EditorThemeClasses} from 'lexical';
 import './PlaygroundEditorTheme.css';
 
 const theme: EditorThemeClasses = {
+  blockCursor: 'PlaygroundEditorTheme__blockCursor',
   characterLimit: 'PlaygroundEditorTheme__characterLimit',
   code: 'PlaygroundEditorTheme__code',
   codeHighlight: {

diff --git a/packages/lexical-rich-text/src/index.ts b/packages/lexical-rich-text/src/index.ts
@@ -42,9 +42,12 @@ import {
   $applyNodeReplacement,
   $createParagraphNode,
   $createRangeSelection,
+  $getAdjacentNode,
   $getNearestNodeFromDOMNode,
+  $getRoot,
   $getSelection,
   $isDecoratorNode,
+  $isElementNode,
   $isNodeSelection,
   $isRangeSelection,
   $isRootNode,
@@ -459,11 +462,16 @@ function handleIndentAndOutdent(
   }
 }
 
-function isTargetWithinDecorator(target: HTMLElement): boolean {
+function $isTargetWithinDecorator(target: HTMLElement): boolean {
   const node = $getNearestNodeFromDOMNode(target);
   return $isDecoratorNode(node);
 }
 
+function $isSelectionAtEndOfRoot(selection: RangeSelection) {
+  const focus = selection.focus;
+  return focus.key === 'root' && focus.offset === $getRoot().getChildrenSize();
+}
+
 export function registerRichText(editor: LexicalEditor): () => void {
   const removeListener = mergeRegister(
     editor.registerCommand(
@@ -660,7 +668,7 @@ export function registerRichText(editor: LexicalEditor): () => void {
         const selection = $getSelection();
         if (
           $isNodeSelection(selection) &&
-          !isTargetWithinDecorator(event.target as HTMLElement)
+          !$isTargetWithinDecorator(event.target as HTMLElement)
         ) {
           // If selection is on a node, let's try and move selection
           // back to being a range selection.
@@ -669,6 +677,21 @@ export function registerRichText(editor: LexicalEditor): () => void {
             nodes[0].selectPrevious();
             return true;
           }
+        } else if ($isRangeSelection(selection)) {
+          const possibleNode = $getAdjacentNode(selection.focus, true);
+          if ($isDecoratorNode(possibleNode) && !possibleNode.isIsolated()) {
+            possibleNode.selectPrevious();
+            event.preventDefault();
+            return true;
+          } else if (
+            $isElementNode(possibleNode) &&
+            !possibleNode.isInline() &&
+            !possibleNode.canBeEmpty()
+          ) {
+            possibleNode.select();
+            event.preventDefault();
+            return true;
+          }
         }
         return false;
       },
@@ -686,6 +709,17 @@ export function registerRichText(editor: LexicalEditor): () => void {
             nodes[0].selectNext(0, 0);
             return true;
           }
+        } else if ($isRangeSelection(selection)) {
+          if ($isSelectionAtEndOfRoot(selection)) {
+            event.preventDefault();
+            return true;
+          }
+          const possibleNode = $getAdjacentNode(selection.focus, false);
+          if ($isDecoratorNode(possibleNode) && !possibleNode.isIsolated()) {
+            possibleNode.selectNext();
+            event.preventDefault();
+            return true;
+          }
         }
         return false;
       },
@@ -724,7 +758,7 @@ export function registerRichText(editor: LexicalEditor): () => void {
         const selection = $getSelection();
         if (
           $isNodeSelection(selection) &&
-          !isTargetWithinDecorator(event.target as HTMLElement)
+          !$isTargetWithinDecorator(event.target as HTMLElement)
         ) {
           // If selection is on a node, let's try and move selection
           // back to being a range selection.
@@ -751,7 +785,7 @@ export function registerRichText(editor: LexicalEditor): () => void {
     editor.registerCommand<KeyboardEvent>(
       KEY_BACKSPACE_COMMAND,
       (event) => {
-        if (isTargetWithinDecorator(event.target as HTMLElement)) {
+        if ($isTargetWithinDecorator(event.target as HTMLElement)) {
           return false;
         }
         const selection = $getSelection();
@@ -779,7 +813,7 @@ export function registerRichText(editor: LexicalEditor): () => void {
     editor.registerCommand<KeyboardEvent>(
       KEY_DELETE_COMMAND,
       (event) => {
-        if (isTargetWithinDecorator(event.target as HTMLElement)) {
+        if ($isTargetWithinDecorator(event.target as HTMLElement)) {
           return false;
         }
         const selection = $getSelection();

diff --git a/packages/lexical-selection/src/range-selection.ts b/packages/lexical-selection/src/range-selection.ts
@@ -17,7 +17,7 @@ import type {
 } from 'lexical';
 
 import {
-  $getDecoratorNode,
+  $getAdjacentNode,
   $getPreviousSelection,
   $hasAncestor,
   $isDecoratorNode,
@@ -319,9 +319,14 @@ export function $shouldOverrideDefaultCharacterSelection(
   selection: RangeSelection,
   isBackward: boolean,
 ): boolean {
-  const possibleNode = $getDecoratorNode(selection.focus, isBackward);
+  const possibleNode = $getAdjacentNode(selection.focus, isBackward);
 
-  return $isDecoratorNode(possibleNode) && !possibleNode.isIsolated();
+  return (
+    ($isDecoratorNode(possibleNode) && !possibleNode.isIsolated()) ||
+    ($isElementNode(possibleNode) &&
+      !possibleNode.isInline() &&
+      !possibleNode.canBeEmpty())
+  );
 }
 
 export function $moveCaretSelection(

diff --git a/packages/lexical/flow/Lexical.js.flow b/packages/lexical/flow/Lexical.js.flow
@@ -817,7 +817,7 @@ declare export function $setSelection(
   selection: null | RangeSelection | NodeSelection | GridSelection,
 ): void;
 declare export function $nodesOfType<T: LexicalNode>(klass: Class<T>): Array<T>;
-declare export function $getDecoratorNode(
+declare export function $getAdjacentNode(
   focus: Point,
   isBackward: boolean,
 ): null | LexicalNode;

diff --git a/packages/lexical/src/LexicalEditor.ts b/packages/lexical/src/LexicalEditor.ts
@@ -74,6 +74,7 @@ export type EditorFocusOptions = {
 };
 
 export type EditorThemeClasses = {
+  blockCursor?: EditorThemeClassName;
   characterLimit?: EditorThemeClassName;
   code?: EditorThemeClassName;
   codeHighlight?: Record<string, EditorThemeClassName>;
@@ -281,6 +282,7 @@ export function resetEditor(
   editor._normalizedNodes = new Set();
   editor._updateTags = new Set();
   editor._updates = [];
+  editor._blockCursorElement = null;
 
   const observer = editor._observer;
 
@@ -492,6 +494,7 @@ export class LexicalEditor {
   _htmlConversions: DOMConversionCache;
   _window: null | Window;
   _editable: boolean;
+  _blockCursorElement: null | HTMLDivElement;
 
   constructor(
     editorState: EditorState,
@@ -553,6 +556,7 @@ export class LexicalEditor {
     this._editable = true;
     this._headless = parentEditor !== null && parentEditor._headless;
     this._window = null;
+    this._blockCursorElement = null;
   }
 
   isComposing(): boolean {

diff --git a/packages/lexical/src/LexicalEvents.ts b/packages/lexical/src/LexicalEvents.ts
@@ -1114,12 +1114,13 @@ export function addRootElementEvents(
                     event as FocusEvent,
                   );
 
-                case 'blur':
+                case 'blur': {
                   return dispatchCommand(
                     editor,
                     BLUR_COMMAND,
                     event as FocusEvent,
                   );
+                }
 
                 case 'drop':
                   return dispatchCommand(

diff --git a/packages/lexical/src/LexicalMutations.ts b/packages/lexical/src/LexicalMutations.ts
@@ -131,6 +131,7 @@ export function $flushMutations(
       // We use the current editor state, as that reflects what is
       // actually "on screen".
       const currentEditorState = editor._editorState;
+      const blockCursorElement = editor._blockCursorElement;
       let shouldRevertSelection = false;
       let possibleTextForFirefoxPaste = '';
 
@@ -179,6 +180,7 @@ export function $flushMutations(
 
             if (
               parentDOM != null &&
+              addedDOM !== blockCursorElement &&
               node === null &&
               (addedDOM.nodeName !== 'BR' ||
                 !isManagedLineBreak(addedDOM, parentDOM, editor))
@@ -206,8 +208,9 @@ export function $flushMutations(
               const removedDOM = removedDOMs[s];
 
               if (
-                removedDOM.nodeName === 'BR' &&
-                isManagedLineBreak(removedDOM, targetDOM, editor)
+                (removedDOM.nodeName === 'BR' &&
+                  isManagedLineBreak(removedDOM, targetDOM, editor)) ||
+                blockCursorElement === removedDOM
               ) {
                 targetDOM.appendChild(removedDOM);
                 unremovedBRs++;

diff --git a/packages/lexical/src/LexicalReconciler.ts b/packages/lexical/src/LexicalReconciler.ts
@@ -635,7 +635,14 @@ function getFirstChild(element: HTMLElement): Node | null {
 }
 
 function getNextSibling(element: HTMLElement): Node | null {
-  return element.nextSibling;
+  let nextSibling = element.nextSibling;
+  if (
+    nextSibling !== null &&
+    nextSibling === activeEditor._blockCursorElement
+  ) {
+    nextSibling = nextSibling.nextSibling;
+  }
+  return nextSibling;
 }
 
 function reconcileNodeChildren(