feat: switch between basic shapes (#9270)

* feat: switch between basic shapes

* add tab for testing

* style tweaks

* only show hint when a new node is created

* fix panel state

* refactor

* combine captures into one

* keep original font size

* switch multi

* switch different types altogether

* use tab only

* fix font size atom

* do not switch from active tool change

* prefer generic when mixed

* provide an optional direction when shape switching

* adjust panel bg & shadow

* redraw to correctly position text

* remove redundant code

* only tab to switch if focusing on app container

* limit which linear elements can be switched

* add shape switch to command palette

* remove hint

* cache initial panel position

* bend line to elbow if needed

* remove debug logic

* clean switch of arrows using app state

* safe conversion between line, sharp, curved, and elbow

* cache linear when panel shows up

* type safe element conversion

* rename type

* respect initial type when switching between linears

* fix elbow segment indexing

* use latest linear

* merge converted elbow points if too close

* focus on panel after click

* set roudness to null to fix drag points offset for elbows

* remove Mutable

* add arrowBoundToElement check

* make it dependent on one signle state

* unmount when not showing

* simpler types, tidy up code

* can change linear when it's linear + non-generic

* fix popup component lifecycle

* move constant to CLASSES

* DRY out type detection

* file & variable renaming

* refactor

* throw in not-prod instead

* simplify

* semi-fix bindings on `generic` type conversion

---------

Co-authored-by: dwelle <5153846+dwelle@users.noreply.github.com>

packages/common/src/constants.ts

@@ -119,6 +119,7 @@ export const CLASSES = {
   SHAPE_ACTIONS_MENU: "App-menu__left",
   ZOOM_ACTIONS: "zoom-actions",
   SEARCH_MENU_INPUT_WRAPPER: "layer-ui__search-inputWrapper",
+  CONVERT_ELEMENT_TYPE_POPUP: "ConvertElementTypePopup",
 };
 
 export const CJK_HAND_DRAWN_FALLBACK_FONT = "Xiaolai";

packages/element/src/binding.ts

@@ -81,7 +81,6 @@ import type {
   NonDeletedSceneElementsMap,
   ExcalidrawTextElement,
   ExcalidrawArrowElement,
-  OrderedExcalidrawElement,
   ExcalidrawElbowArrowElement,
   FixedPoint,
   FixedPointBinding,
@@ -710,29 +709,32 @@ const calculateFocusAndGap = (
 
 // Supports translating, rotating and scaling `changedElement` with bound
 // linear elements.
-// Because scaling involves moving the focus points as well, it is
-// done before the `changedElement` is updated, and the `newSize` is passed
-// in explicitly.
 export const updateBoundElements = (
   changedElement: NonDeletedExcalidrawElement,
   scene: Scene,
   options?: {
     simultaneouslyUpdated?: readonly ExcalidrawElement[];
     newSize?: { width: number; height: number };
-    changedElements?: Map<string, OrderedExcalidrawElement>;
+    changedElements?: Map<string, ExcalidrawElement>;
   },
 ) => {
+  if (!isBindableElement(changedElement)) {
+    return;
+  }
+
   const { newSize, simultaneouslyUpdated } = options ?? {};
   const simultaneouslyUpdatedElementIds = getSimultaneouslyUpdatedElementIds(
     simultaneouslyUpdated,
   );
 
-  if (!isBindableElement(changedElement)) {
+  let elementsMap: ElementsMap = scene.getNonDeletedElementsMap();
-    return;
+  if (options?.changedElements) {
+    elementsMap = new Map(elementsMap) as typeof elementsMap;
+    options.changedElements.forEach((element) => {
+      elementsMap.set(element.id, element);
+    });
   }
 
-  const elementsMap = scene.getNonDeletedElementsMap();
-
   boundElementsVisitor(elementsMap, changedElement, (element) => {
     if (!isLinearElement(element) || element.isDeleted) {
       return;
@@ -836,6 +838,25 @@ export const updateBoundElements = (
   });
 };
 
+export const updateBindings = (
+  latestElement: ExcalidrawElement,
+  scene: Scene,
+  options?: {
+    simultaneouslyUpdated?: readonly ExcalidrawElement[];
+    newSize?: { width: number; height: number };
+    zoom?: AppState["zoom"];
+  },
+) => {
+  if (isLinearElement(latestElement)) {
+    bindOrUnbindLinearElements([latestElement], true, [], scene, options?.zoom);
+  } else {
+    updateBoundElements(latestElement, scene, {
+      ...options,
+      changedElements: new Map([[latestElement.id, latestElement]]),
+    });
+  }
+};
+
 const doesNeedUpdate = (
   boundElement: NonDeleted<ExcalidrawLinearElement>,
   changedElement: ExcalidrawBindableElement,

packages/element/src/newElement.ts

@@ -44,7 +44,6 @@ import type {
   ExcalidrawIframeElement,
   ElementsMap,
   ExcalidrawArrowElement,
-  FixedSegment,
   ExcalidrawElbowArrowElement,
 } from "./types";
 
@@ -478,7 +477,7 @@ export const newArrowElement = <T extends boolean>(
     endArrowhead?: Arrowhead | null;
     points?: ExcalidrawArrowElement["points"];
     elbowed?: T;
-    fixedSegments?: FixedSegment[] | null;
+    fixedSegments?: ExcalidrawElbowArrowElement["fixedSegments"] | null;
   } & ElementConstructorOpts,
 ): T extends true
   ? NonDeleted<ExcalidrawElbowArrowElement>

packages/element/src/typeChecks.ts

@@ -119,6 +119,20 @@ export const isElbowArrow = (
   return isArrowElement(element) && element.elbowed;
 };
 
+export const isSharpArrow = (
+  element?: ExcalidrawElement,
+): element is ExcalidrawArrowElement => {
+  return isArrowElement(element) && !element.elbowed && !element.roundness;
+};
+
+export const isCurvedArrow = (
+  element?: ExcalidrawElement,
+): element is ExcalidrawArrowElement => {
+  return (
+    isArrowElement(element) && !element.elbowed && element.roundness !== null
+  );
+};
+
 export const isLinearElementType = (
   elementType: ElementOrToolType,
 ): boolean => {
@@ -271,6 +285,10 @@ export const isBoundToContainer = (
   );
 };
 
+export const isArrowBoundToElement = (element: ExcalidrawArrowElement) => {
+  return !!element.startBinding || !!element.endBinding;
+};
+
 export const isUsingAdaptiveRadius = (type: string) =>
   type === "rectangle" ||
   type === "embeddable" ||

packages/element/src/types.ts

@@ -412,3 +412,11 @@ export type NonDeletedSceneElementsMap = Map<
 export type ElementsMapOrArray =
   | readonly ExcalidrawElement[]
   | Readonly<ElementsMap>;
+
+export type ConvertibleGenericTypes = "rectangle" | "diamond" | "ellipse";
+export type ConvertibleLinearTypes =
+  | "line"
+  | "sharpArrow"
+  | "curvedArrow"
+  | "elbowArrow";
+export type ConvertibleTypes = ConvertibleGenericTypes | ConvertibleLinearTypes;

packages/excalidraw/actions/actionToggleShapeSwitch.tsx

@@ -0,0 +1,34 @@
+import type { ExcalidrawElement } from "@excalidraw/element/types";
+
+import {
+  getConversionTypeFromElements,
+  convertElementTypePopupAtom,
+} from "../components/ConvertElementTypePopup";
+import { editorJotaiStore } from "../editor-jotai";
+import { CaptureUpdateAction } from "../store";
+
+import { register } from "./register";
+
+export const actionToggleShapeSwitch = register({
+  name: "toggleShapeSwitch",
+  label: "labels.shapeSwitch",
+  icon: () => null,
+  viewMode: true,
+  trackEvent: {
+    category: "shape_switch",
+    action: "toggle",
+  },
+  keywords: ["change", "switch", "swap"],
+  perform(elements, appState, _, app) {
+    editorJotaiStore.set(convertElementTypePopupAtom, {
+      type: "panel",
+    });
+
+    return {
+      captureUpdate: CaptureUpdateAction.NEVER,
+    };
+  },
+  checked: (appState) => appState.gridModeEnabled,
+  predicate: (elements, appState, props) =>
+    getConversionTypeFromElements(elements as ExcalidrawElement[]) !== null,
+});

packages/excalidraw/actions/types.ts

@@ -140,7 +140,8 @@ export type ActionName =
   | "linkToElement"
   | "cropEditor"
   | "wrapSelectionInFrame"
-  | "toggleLassoTool";
+  | "toggleLassoTool"
+  | "toggleShapeSwitch";
 
 export type PanelComponentProps = {
   elements: readonly ExcalidrawElement[];
@@ -195,7 +196,8 @@ export interface Action {
           | "menu"
           | "collab"
           | "hyperlink"
-          | "search_menu";
+          | "search_menu"
+          | "shape_switch";
         action?: string;
         predicate?: (
           appState: Readonly<AppState>,

packages/excalidraw/components/App.tsx

@@ -100,6 +100,7 @@ import {
   arrayToMap,
   type EXPORT_IMAGE_TYPES,
   randomInteger,
+  CLASSES,
 } from "@excalidraw/common";
 
 import {
@@ -431,7 +432,7 @@ import {
 } from "../components/hyperlink/Hyperlink";
 
 import { Fonts } from "../fonts";
-import { editorJotaiStore } from "../editor-jotai";
+import { editorJotaiStore, type WritableAtom } from "../editor-jotai";
 import { ImageSceneDataError } from "../errors";
 import {
   getSnapLinesAtPointer,
@@ -467,6 +468,12 @@ import { LassoTrail } from "../lasso";
 
 import { EraserTrail } from "../eraser";
 
+import ConvertElementTypePopup, {
+  getConversionTypeFromElements,
+  convertElementTypePopupAtom,
+  convertElementTypes,
+} from "./ConvertElementTypePopup";
+
 import { activeConfirmDialogAtom } from "./ActiveConfirmDialog";
 import BraveMeasureTextError from "./BraveMeasureTextError";
 import { ContextMenu, CONTEXT_MENU_SEPARATOR } from "./ContextMenu";
@@ -498,7 +505,6 @@ import type { ExportedElements } from "../data";
 import type { ContextMenuItems } from "./ContextMenu";
 import type { FileSystemHandle } from "../data/filesystem";
 import type { ExcalidrawElementSkeleton } from "../data/transform";
-
 import type {
   AppClassProperties,
   AppProps,
@@ -815,6 +821,15 @@ class App extends React.Component<AppProps, AppState> {
     );
   }
 
+  updateEditorAtom = <Value, Args extends unknown[], Result>(
+    atom: WritableAtom<Value, Args, Result>,
+    ...args: Args
+  ): Result => {
+    const result = editorJotaiStore.set(atom, ...args);
+    this.triggerRender();
+    return result;
+  };
+
   private onWindowMessage(event: MessageEvent) {
     if (
       event.origin !== "https://player.vimeo.com" &&
@@ -1583,6 +1598,9 @@ class App extends React.Component<AppProps, AppState> {
 
     const firstSelectedElement = selectedElements[0];
 
+    const showShapeSwitchPanel =
+      editorJotaiStore.get(convertElementTypePopupAtom)?.type === "panel";
+
     return (
       <div
         className={clsx("excalidraw excalidraw-container", {
@@ -1857,6 +1875,9 @@ class App extends React.Component<AppProps, AppState> {
                           />
                         )}
                         {this.renderFrameNames()}
+                        {showShapeSwitchPanel && (
+                          <ConvertElementTypePopup app={this} />
+                        )}
                       </ExcalidrawActionManagerContext.Provider>
                       {this.renderEmbeddables()}
                     </ExcalidrawElementsContext.Provider>
@@ -2138,7 +2159,7 @@ class App extends React.Component<AppProps, AppState> {
   };
 
   private openEyeDropper = ({ type }: { type: "stroke" | "background" }) => {
-    editorJotaiStore.set(activeEyeDropperAtom, {
+    this.updateEditorAtom(activeEyeDropperAtom, {
       swapPreviewOnAlt: true,
       colorPickerType:
         type === "stroke" ? "elementStroke" : "elementBackground",
@@ -4157,6 +4178,40 @@ class App extends React.Component<AppProps, AppState> {
           return;
         }
 
+        // Shape switching
+        if (event.key === KEYS.ESCAPE) {
+          this.updateEditorAtom(convertElementTypePopupAtom, null);
+        } else if (
+          event.key === KEYS.TAB &&
+          (document.activeElement === this.excalidrawContainerRef?.current ||
+            document.activeElement?.classList.contains(
+              CLASSES.CONVERT_ELEMENT_TYPE_POPUP,
+            ))
+        ) {
+          event.preventDefault();
+
+          const conversionType =
+            getConversionTypeFromElements(selectedElements);
+
+          if (
+            editorJotaiStore.get(convertElementTypePopupAtom)?.type === "panel"
+          ) {
+            if (
+              convertElementTypes(this, {
+                conversionType,
+                direction: event.shiftKey ? "left" : "right",
+              })
+            ) {
+              this.store.shouldCaptureIncrement();
+            }
+          }
+          if (conversionType) {
+            this.updateEditorAtom(convertElementTypePopupAtom, {
+              type: "panel",
+            });
+          }
+        }
+
         if (
           event.key === KEYS.ESCAPE &&
           this.flowChartCreator.isCreatingChart
@@ -4615,7 +4670,7 @@ class App extends React.Component<AppProps, AppState> {
         event[KEYS.CTRL_OR_CMD] &&
         (event.key === KEYS.BACKSPACE || event.key === KEYS.DELETE)
       ) {
-        editorJotaiStore.set(activeConfirmDialogAtom, "clearCanvas");
+        this.updateEditorAtom(activeConfirmDialogAtom, "clearCanvas");
       }
 
       // eye dropper
@@ -6364,7 +6419,11 @@ class App extends React.Component<AppProps, AppState> {
           focus: false,
         })),
       }));
-      editorJotaiStore.set(searchItemInFocusAtom, null);
+      this.updateEditorAtom(searchItemInFocusAtom, null);
+    }
+
+    if (editorJotaiStore.get(convertElementTypePopupAtom)) {
+      this.updateEditorAtom(convertElementTypePopupAtom, null);
     }
 
     // since contextMenu options are potentially evaluated on each render,

packages/excalidraw/components/CommandPalette/CommandPalette.tsx

@@ -11,6 +11,8 @@ import {
   isWritableElement,
 } from "@excalidraw/common";
 
+import { actionToggleShapeSwitch } from "@excalidraw/excalidraw/actions/actionToggleShapeSwitch";
+
 import type { MarkRequired } from "@excalidraw/common/utility-types";
 
 import {
@@ -410,6 +412,14 @@ function CommandPaletteInner({
             actionManager.executeAction(actionToggleSearchMenu);
           },
         },
+        {
+          label: t("labels.shapeSwitch"),
+          category: DEFAULT_CATEGORIES.elements,
+          icon: boltIcon,
+          perform: () => {
+            actionManager.executeAction(actionToggleShapeSwitch);
+          },
+        },
         {
           label: t("labels.changeStroke"),
           keywords: ["color", "outline"],

packages/excalidraw/components/ConvertElementTypePopup.scss

@@ -0,0 +1,18 @@
+@import "../css//variables.module.scss";
+
+.excalidraw {
+  .ConvertElementTypePopup {
+    display: flex;
+    flex-wrap: wrap;
+    justify-content: center;
+    gap: 0.2rem;
+    border-radius: 0.5rem;
+    background: var(--island-bg-color);
+    box-shadow: var(--shadow-island);
+    padding: 0.5rem;
+
+    &:focus {
+      outline: none;
+    }
+  }
+}

packages/excalidraw/components/Stats/Angle.tsx

@@ -11,8 +11,10 @@ import type Scene from "@excalidraw/element/Scene";
 
 import { angleIcon } from "../icons";
 
+import { updateBindings } from "../../../element/src/binding";
+
 import DragInput from "./DragInput";
-import { getStepSizedValue, isPropertyEditable, updateBindings } from "./utils";
+import { getStepSizedValue, isPropertyEditable } from "./utils";
 
 import type { DragInputCallbackType } from "./DragInput";
 import type { AppState } from "../../types";

packages/excalidraw/components/Stats/utils.ts

@@ -1,13 +1,8 @@
 import { pointFrom, pointRotateRads } from "@excalidraw/math";
 
-import {
-  bindOrUnbindLinearElements,
-  updateBoundElements,
-} from "@excalidraw/element/binding";
 import { getBoundTextElement } from "@excalidraw/element/textElement";
 import {
   isFrameLikeElement,
-  isLinearElement,
   isTextElement,
 } from "@excalidraw/element/typeChecks";
 
@@ -27,6 +22,8 @@ import type {
 
 import type Scene from "@excalidraw/element/Scene";
 
+import { updateBindings } from "../../../element/src/binding";
+
 import type { AppState } from "../../types";
 
 export type StatsInputProperty =
@@ -194,19 +191,3 @@ export const getAtomicUnits = (
     });
   return _atomicUnits;
 };
-
-export const updateBindings = (
-  latestElement: ExcalidrawElement,
-  scene: Scene,
-  options?: {
-    simultaneouslyUpdated?: readonly ExcalidrawElement[];
-    newSize?: { width: number; height: number };
-    zoom?: AppState["zoom"];
-  },
-) => {
-  if (isLinearElement(latestElement)) {
-    bindOrUnbindLinearElements([latestElement], true, [], scene, options?.zoom);
-  } else {
-    updateBoundElements(latestElement, scene, options);
-  }
-};

packages/excalidraw/data/restore.ts

@@ -29,6 +29,7 @@ import { bumpVersion } from "@excalidraw/element/mutateElement";
 import { getContainerElement } from "@excalidraw/element/textElement";
 import { detectLineHeight } from "@excalidraw/element/textMeasurements";
 import {
+  isArrowBoundToElement,
   isArrowElement,
   isElbowArrow,
   isFixedPointBinding,
@@ -594,8 +595,7 @@ export const restoreElements = (
   return restoredElements.map((element) => {
     if (
       isElbowArrow(element) &&
-      element.startBinding == null &&
+      !isArrowBoundToElement(element) &&
-      element.endBinding == null &&
       !validateElbowPoints(element.points)
     ) {
       return {

packages/excalidraw/editor-jotai.ts

@@ -1,10 +1,15 @@
 // eslint-disable-next-line no-restricted-imports
-import { atom, createStore, type PrimitiveAtom } from "jotai";
+import {
+  atom,
+  createStore,
+  type PrimitiveAtom,
+  type WritableAtom,
+} from "jotai";
 import { createIsolation } from "jotai-scope";
 
 const jotai = createIsolation();
 
-export { atom, PrimitiveAtom };
+export { atom, PrimitiveAtom, WritableAtom };
 export const { useAtom, useSetAtom, useAtomValue, useStore } = jotai;
 export const EditorJotaiProvider: ReturnType<
   typeof createIsolation

packages/excalidraw/locales/en.json

@@ -165,7 +165,9 @@
     "unCroppedDimension": "Uncropped dimension",
     "copyElementLink": "Copy link to object",
     "linkToElement": "Link to object",
-    "wrapSelectionInFrame": "Wrap selection in frame"
+    "wrapSelectionInFrame": "Wrap selection in frame",
+    "tab": "Tab",
+    "shapeSwitch": "Switch shape"
   },
   "elementLink": {
     "title": "Link to object",

packages/excalidraw/types.ts

@@ -714,6 +714,7 @@ export type AppClassProperties = {
   excalidrawContainerValue: App["excalidrawContainerValue"];
 
   onPointerUpEmitter: App["onPointerUpEmitter"];
+  updateEditorAtom: App["updateEditorAtom"];
 };
 
 export type PointerDownState = Readonly<{

packages/excalidraw/wysiwyg/textWysiwyg.tsx

@@ -80,6 +80,8 @@ const getTransform = (
   return `translate(${translateX}px, ${translateY}px) scale(${zoom.value}) rotate(${degree}deg)`;
 };
 
+type SubmitHandler = () => void;
+
 export const textWysiwyg = ({
   id,
   onChange,
@@ -106,7 +108,7 @@ export const textWysiwyg = ({
   excalidrawContainer: HTMLDivElement | null;
   app: App;
   autoSelect?: boolean;
-}) => {
+}): SubmitHandler => {
   const textPropertiesUpdated = (
     updatedTextElement: ExcalidrawTextElement,
     editable: HTMLTextAreaElement,
@@ -186,7 +188,6 @@ export const textWysiwyg = ({
         }
 
         maxWidth = getBoundTextMaxWidth(container, updatedTextElement);
-
         maxHeight = getBoundTextMaxHeight(
           container,
           updatedTextElement as ExcalidrawTextElementWithContainer,
@@ -735,4 +736,6 @@ export const textWysiwyg = ({
   excalidrawContainer
     ?.querySelector(".excalidraw-textEditorContainer")!
     .appendChild(editable);
+
+  return handleSubmit;
 };