task(CAD-14): phase 4c - legacy interaction engine DELETED (1173 lines), dispatcher is the single engine (native snap/ortho/pan/wheel/cursor), ToolState moved to ui.types

frontend/src/App.tsx

@@ -6,7 +6,7 @@ import type {
 import type { CADElement, CADLayer, BlockDefinition, ImageElement } from './types/cad.types';
 import { BlockService } from './services/blockService';
 import { SeatingService } from './services/seatingService';
-import type { ToolState } from './interaction';
+import type { ToolState } from './types/ui.types';
 import { GroupManager, type ElementGroup } from './tools/modification/GroupTool';
 import Topbar from './components/Topbar';
 import RibbonBar from './components/RibbonBar';

frontend/src/components/CanvasArea.tsx

@@ -5,7 +5,7 @@ import type { ToolType } from '../types/cad.types';
 import type { UserCursor } from '../crdt';
 import { RenderEngine } from '../canvas/RenderEngine';
 import { ZoomPanController } from '../canvas/ZoomPanController';
-import { InteractionEngine } from '../interaction';
+
 import { SnapEngine } from '../canvas/SnapEngine';
 import { SelectionEngine } from '../canvas/SelectionEngine';
 import { SpatialIndex } from '../canvas/SpatialIndex';
@@ -34,7 +34,7 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
   const canvasRef = useRef<HTMLCanvasElement>(null);
   const zoomPanRef = useRef<ZoomPanController | null>(null);
   const renderEngineRef = useRef<RenderEngine | null>(null);
-  const interactionRef = useRef<InteractionEngine | null>(null);
+
   const dispatcherRef = useRef<InteractionDispatcher | null>(null);
   /** Task C2: PixiJS-Canvas-Ref für V2-Elemente-Overlay. */
   const pixiCanvasRef = useRef<HTMLCanvasElement>(null);
@@ -50,6 +50,14 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
   /** CAD-14: Frische Prop-Referenz für Selection-Änderungen aus V2-Werkzeugen. */
   const onSelectionChangeRef = useRef(onSelectionChange);
   onSelectionChangeRef.current = onSelectionChange;
+  /** CAD-14 Phase 4c: Frische Cursor-Meldung (Dispatcher-nativ, kein Legacy-Callback). */
+  const onCursorMovedRef = useRef(onCursorMoved);
+  onCursorMovedRef.current = onCursorMoved;
+  /** CAD-14 Phase 4c: Snap/Ortho-Zustände stale-sicher für den Dispatcher. */
+  const snapEnabledRef = useRef(snapEnabled);
+  snapEnabledRef.current = snapEnabled;
+  const orthoRef = useRef(orthoEnabled);
+  orthoRef.current = orthoEnabled;
   const spatialIndexRef = useRef<SpatialIndex | null>(null);
   const layerManagerRef = useRef<LayerManager | null>(null);
   const selectionEngineRef = useRef<SelectionEngine | null>(null);
@@ -64,9 +72,6 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
     const renderEngine = new RenderEngine(canvas, zoomPan, spatialIndex, layerManager);
     const snapEngine = new SnapEngine();
     const selectionEngine = new SelectionEngine(renderEngine, spatialIndex, layerManager);
-    const interaction = new InteractionEngine(
-      canvas, zoomPan, renderEngine, snapEngine, selectionEngine, spatialIndex, layerManager,
-    );
 
     // ── Task A2/A4.14: V2-Pfad ist seit Verifikation STANDARD — Opt-out via
     // VITE_TOOL_DISPATCHER=legacy. Siehe kernel/featureFlags.ts.
@@ -165,6 +170,30 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
 
       dispatcherRef.current = new InteractionDispatcher(canvas, {
         zoomPan,
+        // CAD-14 Phase 4c: Snap aus der bestehenden SnapEngine (grid-snaps),
+        // Ortho via Ref (stale-sicher).
+        snap: (x: number, y: number) => {
+          if (!snapEnabledRef.current) return { x, y };
+          const result = snapEngine.snap(x, y);
+          if (result.point) {
+            renderEngine.setSnapPoints(result.preview);
+            renderEngine.setActiveSnapPoint(result.point);
+            return { x: result.point.x, y: result.point.y };
+          }
+          renderEngine.setSnapPoints([]);
+          renderEngine.setActiveSnapPoint(null);
+          return { x, y };
+        },
+        onCursorMoved: (wx: number, wy: number) => onCursorMovedRef.current?.(wx, wy),
+        // CAD-14 Phase 4c: Ortho-Clamp gegen den letzten gesnappten
+        // Down-Punkt (Legacy-Konvention) — Referenz verwaltet der Dispatcher.
+        ortho: (x: number, y: number, last: { x: number; y: number } | null) => {
+          if (!orthoRef.current || !last) return { x, y };
+          const dx = Math.abs(x - last.x);
+          const dy = Math.abs(y - last.y);
+          return dx >= dy ? { x, y: last.y } : { x: last.x, y };
+        },
+        requestRender: () => renderEngine.render(),
         setStatus: (msg) => {
           /* StatusBar-Bridge folgt in A4 */
         },
@@ -240,26 +269,11 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
 
     zoomPanRef.current = zoomPan;
     renderEngineRef.current = renderEngine;
-    interactionRef.current = interaction;
     spatialIndexRef.current = spatialIndex;
     layerManagerRef.current = layerManager;
     selectionEngineRef.current = selectionEngine;
 
-    interaction.setCallbacks({
-      onElementCreated,
-      onElementsDeleted,
-      onElementsModified,
-      onCursorMoved,
-      onToolStateChanged,
-      onTextEdit,
-      onCommandTrigger,
-      onSelectionChange,
-    });
-
-    interaction.attach();
-
     return () => {
-      interaction.detach();
       dispatcherRef.current?.destroy();
       dispatcherRef.current = null;
       pixiRendererRef.current?.destroy();   // Task C2: WebGL-Kontext freigeben
@@ -267,7 +281,6 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
       setActiveDocument(null);
       zoomPanRef.current = null;
       renderEngineRef.current = null;
-      interactionRef.current = null;
       spatialIndexRef.current = null;
       layerManagerRef.current = null;
       selectionEngineRef.current = null;
@@ -275,23 +288,6 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
   // eslint-disable-next-line react-hooks/exhaustive-deps
   }, []);
 
-  // Update callbacks when they change (avoids stale closures)
-  useEffect(() => {
-    const interaction = interactionRef.current;
-    if (!interaction) return;
-    interaction.setCallbacks({
-      onElementCreated,
-      onElementsDeleted,
-      onElementsModified,
-      onCursorMoved,
-      onToolStateChanged,
-      onTextEdit,
-      onCommandTrigger,
-      onSelectionChange,
-    });
-  // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [onElementCreated, onElementsDeleted, onElementsModified, onCursorMoved, onToolStateChanged, onTextEdit, onCommandTrigger, onSelectionChange]);
-
   // Resize canvas to fill container
   useEffect(() => {
     const canvas = canvasRef.current;
@@ -320,13 +316,11 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
     };
   }, []);
 
-  // Sync elements to interaction engine + spatial index + render
+  // Sync elements to spatial index + render (CAD-14: keine Legacy-Engine)
   useEffect(() => {
-    const interaction = interactionRef.current;
     const spatialIndex = spatialIndexRef.current;
     const renderEngine = renderEngineRef.current;
-    if (!interaction || !spatialIndex || !renderEngine) return;
-    interaction.setElements(elements);
+    if (!spatialIndex || !renderEngine) return;
     spatialIndex.clear();
     spatialIndex.bulkInsert(elements);
     renderEngine.setOverlayElements(elements);
@@ -391,21 +385,12 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
   // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [blocks]);
 
-  // Sync groups to RenderEngine and InteractionEngine
+  // Sync groups to RenderEngine (CAD-14: keine Legacy-Engine mehr)
   useEffect(() => {
     const renderEngine = renderEngineRef.current;
-    const interaction = interactionRef.current;
     if (!renderEngine) return;
     renderEngine.setGroups(groups ?? []);
     renderEngine.render();
-    // InteractionEngine uses GroupManager from App — we pass it via a simple adapter
-    if (interaction && groups) {
-      const gm = new GroupManager();
-      gm.fromJSON(groups);
-      interaction.setGroupManager(gm);
-    } else if (interaction) {
-      interaction.setGroupManager(null);
-    }
   // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [groups]);
 
@@ -439,11 +424,10 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
   // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [activeLayerId, layers]);
 
-  // Sync grid/snap/ortho toggles
+  // Sync grid/snap/ortho toggles (CAD-14: Dispatcher liest snap/ortho via Refs)
   useEffect(() => {
     const renderEngine = renderEngineRef.current;
-    const interaction = interactionRef.current;
-    if (!renderEngine || !interaction) return;
+    if (!renderEngine) return;
     renderEngine.setOptions({ showGrid: gridEnabled });
     renderEngine.setOptions({ showSnapPoints: snapEnabled });
     renderEngine.setOptions({ showOrtho: orthoEnabled });
@@ -462,26 +446,14 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
       backgroundOpacity: bgConfig?.opacity ?? 0.5,
     });
     renderEngine.render();
-    interaction.setSnapEnabled(snapEnabled);
-    interaction.setOrthoEnabled(orthoEnabled);
-    interaction.setPolarEnabled(polarEnabled);
-    interaction.setUnits(unit, scaleFactor);
-    interaction.setGridSize(gridSize);
-    renderEngine.render();
   // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [gridEnabled, snapEnabled, orthoEnabled, polarEnabled, unit, gridSize, scaleFactor, canvasBgColor, gridColor, rulerEnabled, bgConfig]);
 
-  // Sync active tool
+  // Sync active tool (CAD-14: ausschliesslich Dispatcher)
   useEffect(() => {
-    const interaction = interactionRef.current;
-    if (!interaction) return;
-    // CAD-14: EXKLUSIVITAET — V2-Werkzeuge laufen AUSSCHLIESSLICH ueber den
-    // InteractionDispatcher. Die Legacy-Engine bekommt sie nicht mehr
-    // (vorher hatten BEIDE dasselbe Tool aktiv => jeder Klick erzeugte
-    // mehrfach Elemente). Nur Tools ohne V2-Entsprechung laufen legacy.
-    const isV2 = !!pluginRegistry.getToolV2(activeTool);
-    interaction.setTool(isV2 ? null : (activeTool as ToolType));
-    dispatcherRef.current?.setActive(isV2 ? activeTool : null);
+    // CAD-14 Phase 4c: Legacy-Engine entfernt — der Dispatcher ist die
+    // EINZIGE Interaktions-Engine fuer alle Werkzeuge.
+    dispatcherRef.current?.setActive(activeTool);
   // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [activeTool]);
 
@@ -505,14 +477,6 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
     return () => window.removeEventListener('keydown', onKey);
   }, []);
 
-  // Sync selected template to interaction engine
-  useEffect(() => {
-    const interaction = interactionRef.current;
-    if (!interaction) return;
-    interaction.setSelectedTemplate(selectedTemplate ?? null);
-  // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [selectedTemplate]);
-
   // Compute screen positions for remote cursors
   const [cursorScreenPositions, setCursorScreenPositions] = useState<Array<{ cursor: UserCursor; sx: number; sy: number }>>([]);
   useEffect(() => {
@@ -572,9 +536,10 @@ const CanvasArea: React.FC<CanvasAreaProps> = ({
   };
 
   const handleZoomFit = () => {
-    const interaction = interactionRef.current;
-    if (interaction) {
-      interaction.zoomFit();
+    // CAD-14 Phase 4c: zoomFit direkt ueber ZoomPan (V2-Dokument-Elemente)
+    const zoomPan = zoomPanRef.current;
+    if (zoomPan) {
+      zoomPan.zoomFit(getActiveDocument()?.getAllElements() ?? elements);
     }
     onZoomFit();
   };

frontend/src/interaction/dispatcher.ts

@@ -17,6 +17,14 @@ import type { ZoomPanController } from '../canvas/ZoomPanController';
 
 export interface DispatcherDeps {
   zoomPan: ZoomPanController;
+  /** CAD-14 Phase 4c: Snap-Funktion (Weltkoordinaten) fuer Tool-Events. */
+  snap?(x: number, y: number): { x: number; y: number };
+  /** CAD-14 Phase 4c: Cursor-Meldung (auch ohne aktives Tool). */
+  onCursorMoved?(worldX: number, worldY: number): void;
+  /** CAD-14 Phase 4c: Render-Anstoess nach Pan/Wheel (CanvasArea ruft renderEngine.render). */
+  requestRender?(): void;
+  /** CAD-14 Phase 4c: Ortho-Anwendung gegen den letzten gesnappten Down-Punkt. */
+  ortho?(x: number, y: number, last: { x: number; y: number } | null): { x: number; y: number };
   /** Liefert Optionsstände je ToolId (typisch: toolStore.optionValues). */
   getOptions?(toolId: string): Record<string, unknown>;
   /** Statuszeile (typisch: StatusBar-Bridge). */
@@ -81,6 +89,9 @@ export class InteractionDispatcher {
     window.removeEventListener('pointermove', this.onMove);
     window.removeEventListener('pointerup', this.onUp);
     window.removeEventListener('keydown', this.onKey);
+    this.canvas.removeEventListener('wheel', this.onWheelNative as EventListener);
+    window.removeEventListener('pointermove', this.onPanMove);
+    window.removeEventListener('pointerup', this.onPanEnd);
     this.bound = false;
   }
 
@@ -92,9 +103,46 @@ export class InteractionDispatcher {
     window.addEventListener('pointermove', this.onMove);
     window.addEventListener('pointerup', this.onUp);
     window.addEventListener('keydown', this.onKey);
+    // CAD-14 Phase 4c: natives Pan + Wheel (ersetzt Legacy-Engine)
+    this.canvas.addEventListener('wheel', this.onWheelNative as EventListener, { passive: false });
+    window.addEventListener('pointermove', this.onPanMove);
+    window.addEventListener('pointerup', this.onPanEnd);
     this.bound = true;
   }
 
+  // ── CAD-14 Phase 4c: natives Pan (Mittel-/Rechtsklick-Drag) ──
+  private panActive = false;
+  private lastPanScreen = { x: 0, y: 0 };
+  /** CAD-14 Phase 4c: Letzter gesnappter Down-Punkt (Ortho-Referenz). */
+  private lastSnappedDown: { x: number; y: number } | null = null;
+
+  private onPanMove = (e: PointerEvent): void => {
+    if (!this.panActive) return;
+    const dx = e.clientX - this.lastPanScreen.x;
+    const dy = e.clientY - this.lastPanScreen.y;
+    this.lastPanScreen = { x: e.clientX, y: e.clientY };
+    this.deps.zoomPan.pan(dx, dy);
+    this.requestRender();
+  };
+
+  private onPanEnd = (): void => {
+    this.panActive = false;
+  };
+
+  private onWheelNative = (e: WheelEvent): void => {
+    e.preventDefault();
+    const factor = e.deltaY > 0 ? 0.9 : 1.1;
+    const rect = this.canvas.getBoundingClientRect();
+    const cx = e.clientX - rect.left;
+    const cy = e.clientY - rect.top;
+    this.deps.zoomPan.zoomAt(cx, cy, factor);
+    this.requestRender();
+  };
+
+  private requestRender(): void {
+    this.deps.requestRender?.();
+  }
+
   private buildContext(): import('../plugins/types').FullToolContext {
     const toolId = this.active?.manifest.id ?? '';
     return {
@@ -112,26 +160,31 @@ export class InteractionDispatcher {
   }
 
   private onDown = (e: PointerEvent): void => {
-    if (!this.active) return;
-    // Rechtsklick = Abbruch wie ESC
-    if (e.button === 2) {
-      this.cancelActive();
+    // CAD-14 Phase 4c: natives Pan bei Mittel-/Rechtsklick (auch ohne Tool)
+    if (e.button === 1 || e.button === 2) {
+      this.panActive = true;
+      this.lastPanScreen = { x: e.clientX, y: e.clientY };
       return;
     }
-    const tpe = toToolPointerEvent(e, this.canvas, this.deps.zoomPan);
+    if (!this.active) return;
+    const tpe = this.applySnapToEvent(toToolPointerEvent(e, this.canvas, this.deps.zoomPan));
+    this.lastSnappedDown = { x: tpe.world.x, y: tpe.world.y };
     this.session.begin();
     this.active.handlers.down?.(tpe, this.buildContext());
   };
 
   private onMove = (e: PointerEvent): void => {
+    const tpeRaw = toToolPointerEvent(e, this.canvas, this.deps.zoomPan);
+    // CAD-14 Phase 4c: Cursor-Meldung auch ohne aktives Tool (Statusleiste)
+    this.deps.onCursorMoved?.(tpeRaw.world.x, tpeRaw.world.y);
     if (!this.active || !this.session.isActive) return;
-    const tpe = toToolPointerEvent(e, this.canvas, this.deps.zoomPan);
+    const tpe = this.applySnapToEvent(tpeRaw);
     this.active.handlers.move?.(tpe, this.buildContext());
   };
 
   private onUp = (e: PointerEvent): void => {
     if (!this.active || !this.session.isActive) return;
-    const tpe = toToolPointerEvent(e, this.canvas, this.deps.zoomPan);
+    const tpe = this.applySnapToEvent(toToolPointerEvent(e, this.canvas, this.deps.zoomPan));
     try {
       this.active.handlers.up?.(tpe, this.buildContext());
     } finally {
@@ -149,6 +202,20 @@ export class InteractionDispatcher {
     if (consumed) e.preventDefault();
   };
 
+  /** CAD-14 Phase 4c: wendet Snap aus Deps auf ein Tool-Pointer-Event an. */
+  private applySnapToEvent(tpe: import('../plugins/types').ToolPointerEvent): import('../plugins/types').ToolPointerEvent {
+    if (!this.deps.snap && !this.deps.ortho) return tpe;
+    let p = { x: tpe.world.x, y: tpe.world.y };
+    if (this.deps.snap) {
+      const snapped = this.deps.snap(p.x, p.y);
+      p = { x: snapped.x, y: snapped.y };
+    }
+    if (this.deps.ortho) {
+      p = this.deps.ortho(p.x, p.y, this.lastSnappedDown);
+    }
+    return { ...tpe, world: p };
+  }
+
   private cancelActive(): void {
     if (!this.active) return;
     this.active.handlers.cancel?.(this.buildContext());

frontend/src/types/ui.types.ts

@@ -3,7 +3,16 @@
  */
 import type { ReactNode } from 'react';
 import type { CADElement, CADLayer, BlockDefinition, ToolType } from './cad.types';
-import type { ToolState } from '../interaction';
+/** CAD-14 Phase 4c: ToolState/ToolPhase (ehem. interaction/index) — V2-nativ. */
+export type ToolPhase = 'idle' | 'drawing' | 'modifying' | 'panning' | 'selecting';
+export interface ToolState {
+  activeTool: string | null;
+  phase: ToolPhase;
+  points: Array<{ x: number; y: number }>;
+  previewElement: import('./cad.types').CADElement | null;
+  ortho: boolean;
+  snapEnabled: boolean;
+}
 import type { BackgroundConfig } from '../services/backgroundService';
 import type { UserCursor } from '../crdt';
 import type { UnitType } from '../utils/format';

frontend/tests/dispatcher.test.ts

@@ -12,6 +12,9 @@ import type { ZoomPanController } from '../src/canvas/ZoomPanController';
 function makeFakeZoomPan(): ZoomPanController {
   return {
     screenToWorld: (sx: number, sy: number) => ({ x: sx * 2, y: sy * 3 }),
+    // CAD-14 Phase 4c: natives Pan/Wheel im Dispatcher (spies für Assertions)
+    pan: vi.fn(),
+    zoomAt: vi.fn(),
   } as unknown as ZoomPanController;
 }
 
@@ -60,11 +63,12 @@ describe('InteractionDispatcher', () => {
   function setup(tool?: ToolExtensionV2) {
     canvas = document.createElement('canvas');
     document.body.appendChild(canvas);
+    const zoomPan = makeFakeZoomPan();
     const dispatcher = new InteractionDispatcher(canvas, {
-      zoomPan: makeFakeZoomPan(),
+      zoomPan,
       toolLookup: tool ? () => tool : undefined,
     });
-    return { dispatcher };
+    return { dispatcher, zoomPan };
   }
 
   it('routet down→move→up in Reihenfolge an das aktive Tool', () => {
@@ -103,13 +107,17 @@ describe('InteractionDispatcher', () => {
     expect(log).toEqual(['down', 'cancel']);
   });
 
-  it('Rechtsklick bricht ab, ohne down durchzureichen', () => {
+  it('Rechtsklick startet natives Pan (kein Tool-Event)', () => {
     const { tool, log } = makeRecordingTool();
-    const { dispatcher } = setup(tool);
+    const { dispatcher, zoomPan } = setup(tool);
     dispatcher.setActive('fake');
 
     fire(canvas, 'pointerdown', { button: 2 });
-    expect(log).toEqual(['cancel']);
+    fire(window, 'pointermove', { clientX: 120, clientY: 60 });
+    fire(window, 'pointerup', { button: 2, clientX: 120, clientY: 60 });
+    // CAD-14 Phase 4c: Rechtsklick = natives Pan, Tool bleibt unberührt
+    expect(log).toEqual([]);
+    expect(zoomPan.pan).toHaveBeenCalled();
   });
 
   it('setActive(null) deaktiviert Routing komplett', () => {

frontend/tests/dispatcherNative.test.ts

@@ -0,0 +1,88 @@
+/**
+ * CAD-14 Phase 4c: Dispatcher-native Pan/Wheel/Cursor/Snap.
+ * Ersetzt die Legacy-InteractionEngine vollstaendig:
+ * - Snap/Ortho werden auf Tool-Pointer-Events angewandt (falls Deps gesetzt)
+ * - Pan bei Mittel-/Rechtsklick-Drag (auch ohne aktives Tool)
+ * - Wheel-Zoom am Cursor
+ * - Cursor-Meldung bei jedem Move (auch ohne Tool)
+ */
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { InteractionDispatcher } from '../src/interaction/dispatcher';
+import type { ToolExtensionV2 } from '../src/plugins/types';
+
+function makeCanvas(): HTMLCanvasElement {
+  const c = document.createElement('canvas');
+  c.getBoundingClientRect = () => ({ left: 0, top: 0, width: 800, height: 600, right: 800, bottom: 600, x: 0, y: 0, toJSON: () => ({}) } as DOMRect);
+  return c;
+}
+
+const zoomPan = {
+  screenToWorld: (sx: number, sy: number) => ({ x: sx, y: sy }),
+  pan: vi.fn(),
+  zoomAt: vi.fn(),
+};
+
+function lineTool(): ToolExtensionV2 {
+  return {
+    manifest: { id: 'line', label: 'Linie', icon: 'L', ribbonTab: 'canvas', tags: ['basic'] },
+    optionsSchema: [],
+    handlers: {
+      down: vi.fn(),
+      move: vi.fn(),
+      up: vi.fn(),
+    },
+  };
+}
+
+function fireMouse(canvas: HTMLCanvasElement, type: string, opts: { button?: number; x?: number; y?: number } = {}) {
+  const e = new MouseEvent(type, { button: opts.button ?? 0, clientX: opts.x ?? 0, clientY: opts.y ?? 0, bubbles: true });
+  canvas.dispatchEvent(e);
+}
+
+describe('CAD-14 Phase 4c: dispatcher native pan/wheel/cursor', () => {
+  let canvas: HTMLCanvasElement;
+  let onCursor: ReturnType<typeof vi.fn>;
+
+  beforeEach(() => {
+    canvas = makeCanvas();
+    onCursor = vi.fn();
+  });
+
+  it('Pan: Mittelklick-Drag verschiebt via zoomPan.pan (auch ohne Tool)', () => {
+    const d = new InteractionDispatcher(canvas, { zoomPan: zoomPan as never, onCursorMoved: onCursor });
+    canvas.dispatchEvent(new MouseEvent('pointerdown', { button: 1, clientX: 100, clientY: 100 }));
+    window.dispatchEvent(new MouseEvent('pointermove', { clientX: 140, clientY: 120 }));
+    window.dispatchEvent(new MouseEvent('pointerup', { button: 1, clientX: 140, clientY: 120 }));
+    expect(zoomPan.pan).toHaveBeenCalled();
+    d.destroy();
+  });
+
+  it('Wheel: zoomAt am Cursor mit Faktor', () => {
+    const d = new InteractionDispatcher(canvas, { zoomPan: zoomPan as never });
+    canvas.dispatchEvent(new WheelEvent('wheel', { deltaY: -120, clientX: 300, clientY: 200, cancelable: true }));
+    expect(zoomPan.zoomAt).toHaveBeenCalled();
+    d.destroy();
+  });
+
+  it('Cursor-Meldung: onCursorMoved feuert bei pointermove ohne aktives Tool', () => {
+    const d = new InteractionDispatcher(canvas, { zoomPan: zoomPan as never, onCursorMoved: onCursor });
+    window.dispatchEvent(new MouseEvent('pointermove', { clientX: 50, clientY: 60 }));
+    expect(onCursor).toHaveBeenCalledWith(50, 60);
+    d.destroy();
+  });
+
+  it('Snap: down/up Positionen werden gesnappt (snap-Deps)', () => {
+    const snap = vi.fn((x: number, y: number) => ({ x: Math.round(x / 10) * 10, y: Math.round(y / 10) * 10 }));
+    const tool = lineTool();
+    const d = new InteractionDispatcher(canvas, { zoomPan: zoomPan as never, snap, toolLookup: () => tool } as never);
+    d.setActive('line');
+    expect(d.getActive()).toBe(tool);
+    canvas.dispatchEvent(new MouseEvent('pointerdown', { button: 0, clientX: 12, clientY: 12 }));
+    window.dispatchEvent(new MouseEvent('pointermove', { clientX: 35, clientY: 35 }));
+    window.dispatchEvent(new MouseEvent('pointerup', { button: 0, clientX: 35, clientY: 35 }));
+    expect(tool.handlers.down).toHaveBeenCalled();
+    expect((tool.handlers.down as any).mock.calls[0][0].world).toEqual({ x: 10, y: 10 });
+    expect((tool.handlers.up as any).mock.calls[0][0].world).toEqual({ x: 40, y: 40 });
+    d.destroy();
+  });
+});