add drag state to item grid

src/renderer/components/item-list/helpers/get-dragged-items.ts

@@ -0,0 +1,69 @@
+import {
+    ItemListStateActions,
+    ItemListStateItem,
+} from '/@/renderer/components/item-list/helpers/item-list-state';
+import {
+    Album,
+    AlbumArtist,
+    Artist,
+    LibraryItem,
+    Playlist,
+    Song,
+} from '/@/shared/types/domain-types';
+
+/**
+ * Converts domain data to ItemListStateItem format
+ */
+const convertToItemListItem = (
+    data: Album | AlbumArtist | Artist | Playlist | Song,
+    itemType: LibraryItem,
+): ItemListStateItem => {
+    return {
+        _serverId: data._serverId,
+        id: data.id,
+        itemType,
+    };
+};
+
+/**
+ * Gets the items that should be dragged based on the current data and selection state.
+ * If the current item is already selected, drag all selected items.
+ * Otherwise, select and drag only the current item.
+ *
+ * @param data - The item data to drag (Album, AlbumArtist, Artist, Playlist, or Song)
+ * @param itemType - The type of library item
+ * @param internalState - The item list state actions (optional)
+ * @param updateSelection - Whether to update the selection state (default: true)
+ * @returns Array of ItemListItem objects that should be dragged
+ */
+export const getDraggedItems = (
+    data: Album | AlbumArtist | Artist | Playlist | Song | undefined,
+    itemType: LibraryItem,
+    internalState?: ItemListStateActions,
+    updateSelection: boolean = true,
+): ItemListStateItem[] => {
+    if (!data || !internalState) {
+        return [];
+    }
+
+    // Convert data to ItemListStateItem format
+    const draggedItem = convertToItemListItem(data, itemType);
+
+    const previouslySelected = internalState.getSelected();
+    const isDraggingSelectedItem = previouslySelected.some((selected) => selected.id === data.id);
+
+    const draggedItems: ItemListStateItem[] = [];
+
+    if (isDraggingSelectedItem) {
+        // If dragging a selected item, drag all selected items
+        draggedItems.push(...previouslySelected);
+    } else {
+        // If dragging an unselected item, select it and drag only it
+        if (updateSelection) {
+            internalState.setSelected([draggedItem]);
+        }
+        draggedItems.push(draggedItem);
+    }
+
+    return draggedItems;
+};