Refactor binding suggestions

packages/element/src/binding.ts

@@ -398,6 +398,51 @@ export const getSuggestedBindingsForArrows = (
   );
 };
 
+export const maybeSuggestBindingsForLinearElementAtCoords = (
+  linearElement: NonDeleted<ExcalidrawLinearElement>,
+  /** scene coords */
+  pointerCoords: {
+    x: number;
+    y: number;
+  }[],
+  scene: Scene,
+  zoom: AppState["zoom"],
+  // During line creation the start binding hasn't been written yet
+  // into `linearElement`
+  oppositeBindingBoundElement?: ExcalidrawBindableElement | null,
+): ExcalidrawBindableElement[] => {
+  if (!pointerCoords.length) {
+    return [];
+  }
+
+  const suggestedBindings = pointerCoords.reduce(
+    (acc: NonDeleted<ExcalidrawBindableElement>[], coords) => {
+      const hoveredBindableElement = getHoveredElementForBinding(
+        coords,
+        scene.getNonDeletedElements(),
+        scene.getNonDeletedElementsMap(),
+        zoom,
+        isElbowArrow(linearElement),
+        isElbowArrow(linearElement),
+      );
+      if (
+        hoveredBindableElement != null &&
+        !isLinearElementSimpleAndAlreadyBound(
+          linearElement,
+          oppositeBindingBoundElement?.id,
+          hoveredBindableElement,
+        )
+      ) {
+        acc.push(hoveredBindableElement);
+      }
+      return acc;
+    },
+    [],
+  );
+
+  return suggestedBindings;
+};
+
 export const maybeBindLinearElement = (
   linearElement: NonDeleted<ExcalidrawLinearElement>,
   appState: AppState,

packages/element/src/linearElementEditor.ts

@@ -39,6 +39,7 @@ import {
   bindOrUnbindLinearElement,
   getHoveredElementForBinding,
   isBindingEnabled,
+  maybeSuggestBindingsForLinearElementAtCoords,
 } from "./binding";
 import {
   getElementAbsoluteCoords,
@@ -245,18 +246,13 @@ export class LinearElementEditor {
     app: AppClassProperties,
     scenePointerX: number,
     scenePointerY: number,
-    maybeSuggestBinding: (
-      element: NonDeleted<ExcalidrawLinearElement>,
-      pointSceneCoords: { x: number; y: number }[],
-    ) => void,
     linearElementEditor: LinearElementEditor,
-    scene: Scene,
-  ): LinearElementEditor | null {
+  ): Pick<AppState, keyof AppState> | null {
     if (!linearElementEditor) {
       return null;
     }
     const { elementId } = linearElementEditor;
-    const elementsMap = scene.getNonDeletedElementsMap();
+    const elementsMap = app.scene.getNonDeletedElementsMap();
     const element = LinearElementEditor.getElement(elementId, elementsMap);
     if (!element) {
       return null;
@@ -309,7 +305,7 @@ export class LinearElementEditor {
 
         LinearElementEditor.movePoints(
           element,
-          scene,
+          app.scene,
           new Map([
             [
               selectedIndex,
@@ -337,7 +333,7 @@ export class LinearElementEditor {
 
         LinearElementEditor.movePoints(
           element,
-          scene,
+          app.scene,
           new Map(
             selectedPointsIndices.map((pointIndex) => {
               const newPointPosition: LocalPoint =
@@ -369,10 +365,11 @@ export class LinearElementEditor {
 
       const boundTextElement = getBoundTextElement(element, elementsMap);
       if (boundTextElement) {
-        handleBindTextResize(element, scene, false);
+        handleBindTextResize(element, app.scene, false);
       }
 
       // suggest bindings for first and last point if selected
+      let suggestedBindings: ExcalidrawBindableElement[] = [];
       if (isBindingElement(element, false)) {
         const coords: { x: number; y: number }[] = [];
 
@@ -404,11 +401,16 @@ export class LinearElementEditor {
         }
 
         if (coords.length) {
-          maybeSuggestBinding(element, coords);
+          suggestedBindings = maybeSuggestBindingsForLinearElementAtCoords(
+            element,
+            coords,
+            app.scene,
+            app.state.zoom,
+          );
         }
       }
 
-      return {
+      const newLinearElementEditor = {
         ...linearElementEditor,
         selectedPointsIndices,
         segmentMidPointHoveredCoords:
@@ -427,6 +429,15 @@ export class LinearElementEditor {
             : -1,
         isDragging: true,
       };
+
+      return {
+        ...app.state,
+        editingLinearElement: app.state.editingLinearElement
+          ? newLinearElementEditor
+          : null,
+        selectedLinearElement: newLinearElementEditor,
+        suggestedBindings,
+      };
     }
 
     return null;

packages/excalidraw/components/App.tsx

@@ -104,7 +104,11 @@ import {
   Emitter,
 } from "@excalidraw/common";
 
-import { getCommonBounds, getElementAbsoluteCoords } from "@excalidraw/element";
+import {
+  getCommonBounds,
+  getElementAbsoluteCoords,
+  maybeSuggestBindingsForLinearElementAtCoords,
+} from "@excalidraw/element";
 
 import {
   bindOrUnbindLinearElement,
@@ -112,7 +116,6 @@ import {
   fixBindingsAfterDeletion,
   getHoveredElementForBinding,
   isBindingEnabled,
-  isLinearElementSimpleAndAlreadyBound,
   maybeBindLinearElement,
   shouldEnableBindingForPointerEvent,
   updateBoundElements,
@@ -299,7 +302,6 @@ import type { ElementUpdate } from "@excalidraw/element";
 import type { LocalPoint, Radians } from "@excalidraw/math";
 
 import type {
-  ExcalidrawBindableElement,
   ExcalidrawElement,
   ExcalidrawFreeDrawElement,
   ExcalidrawGenericElement,
@@ -5961,11 +5963,15 @@ class App extends React.Component<AppProps, AppState> {
       // and point
       const { newElement } = this.state;
       if (isBindingElement(newElement, false)) {
-        this.maybeSuggestBindingsForLinearElementAtCoords(
+        this.setState({
+          suggestedBindings: maybeSuggestBindingsForLinearElementAtCoords(
             newElement,
             [scenePointer],
+            this.scene,
+            this.state.zoom,
             this.state.startBoundElement,
-        );
+          ),
+        });
       } else {
         this.maybeSuggestBindingAtCursor(scenePointer, false);
       }
@@ -8251,31 +8257,19 @@ class App extends React.Component<AppProps, AppState> {
           return;
         }
 
-        const newLinearElementEditor = LinearElementEditor.handlePointDragging(
+        const newState = LinearElementEditor.handlePointDragging(
           event,
           this,
           pointerCoords.x,
           pointerCoords.y,
-          (element, pointsSceneCoords) => {
-            this.maybeSuggestBindingsForLinearElementAtCoords(
-              element,
-              pointsSceneCoords,
-            );
-          },
           linearElementEditor,
-          this.scene,
         );
-        if (newLinearElementEditor) {
+        if (newState) {
           pointerDownState.lastCoords.x = pointerCoords.x;
           pointerDownState.lastCoords.y = pointerCoords.y;
           pointerDownState.drag.hasOccurred = true;
 
-          this.setState({
-            editingLinearElement: this.state.editingLinearElement
-              ? newLinearElementEditor
-              : null,
-            selectedLinearElement: newLinearElementEditor,
-          });
+          this.setState(newState);
 
           return;
         }
@@ -8754,11 +8748,15 @@ class App extends React.Component<AppProps, AppState> {
 
           if (isBindingElement(newElement, false)) {
             // When creating a linear element by dragging
-            this.maybeSuggestBindingsForLinearElementAtCoords(
+            this.setState({
+              suggestedBindings: maybeSuggestBindingsForLinearElementAtCoords(
                 newElement,
                 [pointerCoords],
+                this.scene,
+                this.state.zoom,
                 this.state.startBoundElement,
-            );
+              ),
+            });
           }
         } else {
           pointerDownState.lastCoords.x = pointerCoords.x;
@@ -10285,49 +10283,6 @@ class App extends React.Component<AppProps, AppState> {
     });
   };
 
-  private maybeSuggestBindingsForLinearElementAtCoords = (
-    linearElement: NonDeleted<ExcalidrawLinearElement>,
-    /** scene coords */
-    pointerCoords: {
-      x: number;
-      y: number;
-    }[],
-    // During line creation the start binding hasn't been written yet
-    // into `linearElement`
-    oppositeBindingBoundElement?: ExcalidrawBindableElement | null,
-  ): void => {
-    if (!pointerCoords.length) {
-      return;
-    }
-
-    const suggestedBindings = pointerCoords.reduce(
-      (acc: NonDeleted<ExcalidrawBindableElement>[], coords) => {
-        const hoveredBindableElement = getHoveredElementForBinding(
-          coords,
-          this.scene.getNonDeletedElements(),
-          this.scene.getNonDeletedElementsMap(),
-          this.state.zoom,
-          isElbowArrow(linearElement),
-          isElbowArrow(linearElement),
-        );
-        if (
-          hoveredBindableElement != null &&
-          !isLinearElementSimpleAndAlreadyBound(
-            linearElement,
-            oppositeBindingBoundElement?.id,
-            hoveredBindableElement,
-          )
-        ) {
-          acc.push(hoveredBindableElement);
-        }
-        return acc;
-      },
-      [],
-    );
-
-    this.setState({ suggestedBindings });
-  };
-
   private clearSelection(hitElement: ExcalidrawElement | null): void {
     this.setState((prevState) => ({
       selectedElementIds: makeNextSelectedElementIds({}, prevState),