planning

node_modules/dnd-core/lib/reducers/dragOffset.js

@@ -0,0 +1,32 @@
+import { INIT_COORDS, BEGIN_DRAG, HOVER, END_DRAG, DROP, } from '../actions/dragDrop';
+import { areCoordsEqual } from '../utils/equality';
+const initialState = {
+    initialSourceClientOffset: null,
+    initialClientOffset: null,
+    clientOffset: null,
+};
+export function reduce(state = initialState, action) {
+    const { payload } = action;
+    switch (action.type) {
+        case INIT_COORDS:
+        case BEGIN_DRAG:
+            return {
+                initialSourceClientOffset: payload.sourceClientOffset,
+                initialClientOffset: payload.clientOffset,
+                clientOffset: payload.clientOffset,
+            };
+        case HOVER:
+            if (areCoordsEqual(state.clientOffset, payload.clientOffset)) {
+                return state;
+            }
+            return {
+                ...state,
+                clientOffset: payload.clientOffset,
+            };
+        case END_DRAG:
+        case DROP:
+            return initialState;
+        default:
+            return state;
+    }
+}