Fixed panning/dragging interations (the ones that include pressing po…

…inter down) in FireFox (#343)
statelyai · Feb 1, 2022 · 632f950 · 632f950
1 parent 42d1303
commit 632f950
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diff --git a/.changeset/healthy-lies-jump.md b/.changeset/healthy-lies-jump.md
@@ -0,0 +1,5 @@
+---
+'xstate-viz-app': patch
+---
+
+Fixed panning/dragging interations (the ones that include pressing pointer down) in FireFox.
diff --git a/src/dragSessionTracker.ts b/src/dragSessionTracker.ts
@@ -141,7 +141,7 @@ export const dragSessionTracker = dragSessionModel.createMachine(
         ref!.current!.releasePointerCapture(session!.pointerId),
       setSessionData: assign({
         session: (ctx, ev: any) => {
-          if (ev.pointerId && ev.point)
+          if ('pointerId' in ev && ev.point)
             return {
               pointerId: ev.pointerId,
               point: ev.point,