Implement Drag & Drop of checks

src/module/actor/actor-prepared-data.ts

@@ -58,6 +58,10 @@ interface DS4ActorPreparedDataDataRolling {
 
 export type Check = keyof typeof DS4.i18n.checks;
 
+export function isCheck(value: string): value is Check {
+    return Object.keys(DS4.i18n.checks).includes(value);
+}
+
 type DS4ActorPreparedDataDataChecks = {
     [key in Check]: number;
 };

src/module/actor/sheets/actor-sheet.ts

@@ -1,9 +1,11 @@
 import { ModifiableDataBaseTotal } from "../../common/common-data";
 import { DS4 } from "../../config";
+import { getCanvas } from "../../helpers";
 import { DS4Item } from "../../item/item";
 import { DS4ItemData } from "../../item/item-data";
 import notifications from "../../ui/notifications";
 import { DS4Actor } from "../actor";
+import { isCheck } from "../actor-prepared-data";
 
 /**
  * The base Sheet class for all DS4 Actors
@@ -27,6 +29,10 @@ export class DS4ActorSheet extends ActorSheet<ActorSheet.Data<DS4Actor>> {
                 ".special-creature-abilities",
             ],
             tabs: [{ navSelector: ".sheet-tabs", contentSelector: ".sheet-body", initial: "values" }],
+            dragDrop: [
+                { dragSelector: ".item-list .item", dropSelector: null },
+                { dragSelector: ".ds4-check", dropSelector: null },
+            ],
             width: 650,
         });
     }
@@ -240,6 +246,27 @@ export class DS4ActorSheet extends ActorSheet<ActorSheet.Data<DS4Actor>> {
         this.actor.rollCheck(check);
     }
 
+    /** @override */
+    _onDragStart(event: DragEvent): void {
+        const target = event.currentTarget as HTMLElement;
+        if (!(target instanceof HTMLElement)) return super._onDragStart(event);
+
+        const check = target.dataset.check;
+        if (!check) return super._onDragStart(event);
+
+        if (!isCheck(check)) throw new Error(game.i18n.format("DS4.ErrorCannotDragMissingCheck", { check }));
+
+        const dragData = {
+            actorId: this.actor.id,
+            sceneId: this.actor.isToken ? getCanvas().scene?.id : null,
+            tokenId: this.actor.isToken ? this.actor.token?.id : null,
+            type: "Check",
+            data: check,
+        };
+
+        event.dataTransfer?.setData("text/plain", JSON.stringify(dragData));
+    }
+
     /** @override */
     protected async _onDropItem(
         event: DragEvent,