add item dropping outside of inventory

src/graphics/ui/elements/InventoryView.cpp

@@ -1,5 +1,7 @@
 #include "InventoryView.hpp"
 
+#include <iostream>
+
 #include <glm/glm.hpp>
 #include <utility>
 
@@ -19,6 +21,7 @@
 #include "items/Inventories.hpp"
 #include "items/Inventory.hpp"
 #include "items/ItemDef.hpp"
+#include "items/ItemStack.hpp"
 #include "logic/scripting/scripting.hpp"
 #include "maths/voxmaths.hpp"
 #include "objects/Player.hpp"
@@ -610,6 +613,33 @@ void InventoryView::setPos(const glm::vec2& pos) {
     Container::setPos(pos - origin);
 }
 
+void InventoryView::clickedOutside(Mousecode button) {
+    // root is the id of the main inventory
+    if (getId() != "root") {
+        return;
+    }
+    int mode;
+    if (button == Mousecode::BUTTON_1) {
+        mode = 0;
+    } else if (button == Mousecode::BUTTON_2) {
+        mode = 1;
+    } else if (button == Mousecode::BUTTON_3) {
+        mode = 2;
+    } else {
+        return;
+    };
+    auto exchangeSlot = std::dynamic_pointer_cast<SlotView>(
+        gui.get(SlotView::EXCHANGE_SLOT_NAME));
+    if (exchangeSlot == nullptr) {
+        return;
+    }
+    ItemStack& grabbed = exchangeSlot->getStack();
+    if (grabbed.isEmpty()) {
+        return;
+    }
+    scripting::on_inventory_clicked_outside(exchangeSlot->getInventoryId(), 0, mode);
+}
+
 void InventoryView::setOrigin(const glm::vec2& origin) {
     this->origin = origin;
 }

src/graphics/ui/elements/InventoryView.hpp

@@ -143,6 +143,8 @@ namespace gui {
 
         void setSelected(int index);
 
+        void clickedOutside(Mousecode button) override;
+
         void bind(
             const std::shared_ptr<Inventory>& inventory,
             const Content* content

src/graphics/ui/elements/UINode.hpp

@@ -207,6 +207,9 @@ namespace gui {
         virtual void onFocus();
         virtual void doubleClick(int x, int y);
         virtual void click(int x, int y);
+        virtual void clickedOutside(Mousecode button) {
+            // Empty for all UINodes, except InventoryView
+        }
         virtual void clicked(Mousecode button);
         virtual void mouseMove(int x, int y) {};
         virtual void mouseRelease(int x, int y);