Make grinder use item slots (& misc eject-button changes) (#7197)

Content.Shared/Containers/ItemSlot/ItemSlotEvents.cs

@@ -0,0 +1,32 @@
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Containers.ItemSlots;
+
+/// <summary>
+///     Used for various "eject this item" buttons.
+/// </summary>
+[Serializable, NetSerializable]
+public sealed class ItemSlotButtonPressedEvent : BoundUserInterfaceMessage
+{
+    /// <summary>
+    ///     The name of the slot/container from which to insert or eject an item.
+    /// </summary>
+    public string SlotId;
+
+    /// <summary>
+    ///     Whether to attempt to insert an item into the slot, if there is not already one inside.
+    /// </summary>
+    public bool TryInsert;
+
+    /// <summary>
+    ///     Whether to attempt to eject the item from the slot, if it has one.
+    /// </summary>
+    public bool TryEject;
+
+    public ItemSlotButtonPressedEvent(string slotId, bool tryEject = true, bool tryInsert = true)
+    {
+        SlotId = slotId;
+        TryEject = tryEject;
+        TryInsert = tryInsert;
+    }
+}