diff --git a/README.md b/README.md
index 3a4a643..a0b35c3 100644
--- a/README.md
+++ b/README.md
@@ -339,6 +339,9 @@ You can, of course, also implement GUIs for other inventory types:
 val dropperGui = gui(Component.text("Title"), 9, InventoryType.DROPPER) {
     // You can also set multiple indexes at once
     set(listOf(1, 3, 4, 5, 7), ItemStack(Material.GRAY_STAINED_GLASS_PANE))
+
+    // You can also cancel all clicks that occur while the GUI is open
+    onClick { isCancelled = true }
 }
 player.openInventory(dropperGui)
 ```
diff --git a/src/main/kotlin/gg/flyte/twilight/gui/GUI.kt b/src/main/kotlin/gg/flyte/twilight/gui/GUI.kt
index 407c640..acbb9c3 100644
--- a/src/main/kotlin/gg/flyte/twilight/gui/GUI.kt
+++ b/src/main/kotlin/gg/flyte/twilight/gui/GUI.kt
@@ -30,6 +30,7 @@ class GUI(val title: Component, val size: Int, val type: InventoryType, val cont
     lateinit var viewer: Player
 
     private val clickEvent = event<InventoryClickEvent> {
+        if (inventory == this@GUI.inventory) slotAction[-1]?.invoke(this)
         if (clickedInventory != this@GUI.inventory) return@event
         slotAction[slot]?.invoke(this)
     }
@@ -40,6 +41,13 @@ class GUI(val title: Component, val size: Int, val type: InventoryType, val cont
         }
     }
 
+    /**
+     * Set the action to be executed when the player clicks on any slot while the GUI is open.
+     */
+    fun onClick(action: InventoryClickEvent.() -> Unit) {
+        slotAction[-1] = action
+    }
+
     @JvmName("setSlot")
     fun set(slot: Int, item: ItemStack, action: InventoryClickEvent.() -> Unit = {}) {
         inventory.setItem(slot, item)