add updatefunc to slot, which will be emited every interaction with it

src/frontend/InventoryView.cpp

@@ -31,6 +31,7 @@ SlotLayout::SlotLayout(
     glm::vec2 position,
     bool background,
     bool itemSource,
+    slotcallback updateFunc,
     slotcallback shareFunc,
     slotcallback rightClick
 ) 
@@ -38,6 +39,7 @@ SlotLayout::SlotLayout(
       position(position),
       background(background),
       itemSource(itemSource),
+      updateFunc(updateFunc),
       shareFunc(shareFunc),
       rightClick(rightClick) {}
 
@@ -218,6 +220,9 @@ void SlotView::clicked(gui::GUI* gui, mousecode button) {
             if (layout.shareFunc) {
                 layout.shareFunc(layout.index, stack);
             }
+            if (layout.updateFunc) {
+                layout.updateFunc(layout.index, stack);
+            }
             return;
         }
         if (!layout.itemSource && stack.accepts(grabbed)) {
@@ -236,6 +241,9 @@ void SlotView::clicked(gui::GUI* gui, mousecode button) {
     } else if (button == mousecode::BUTTON_2) {
         if (layout.rightClick) {
             layout.rightClick(inventoryid, stack);
+            if (layout.updateFunc) {
+                layout.updateFunc(layout.index, stack);
+            }
             return;
         }
         if (layout.itemSource)
@@ -258,6 +266,9 @@ void SlotView::clicked(gui::GUI* gui, mousecode button) {
             }
         }
     }
+    if (layout.updateFunc) {
+        layout.updateFunc(layout.index, stack);
+    }
 }
 
 void SlotView::onFocus(gui::GUI* gui) {
@@ -384,10 +395,13 @@ static slotcallback readSlotFunc(InventoryView* view, gui::UiXmlReader& reader,
 static void readSlot(InventoryView* view, gui::UiXmlReader& reader, xml::xmlelement element) {
     int index = element->attr("index", "0").asInt();
     bool itemSource = element->attr("item-source", "false").asBool();
-    SlotLayout layout(index, glm::vec2(), true, itemSource, nullptr, nullptr);
+    SlotLayout layout(index, glm::vec2(), true, itemSource, nullptr, nullptr, nullptr);
     if (element->has("pos")) {
         layout.position = element->attr("pos").asVec2();
     }
+    if (element->has("updatefunc")) {
+        layout.updateFunc = readSlotFunc(view, reader, element, "updatefunc");
+    }
     if (element->has("sharefunc")) {
         layout.shareFunc = readSlotFunc(view, reader, element, "sharefunc");
     }
@@ -421,10 +435,13 @@ static void readSlotsGrid(InventoryView* view, gui::UiXmlReader& reader, xml::xm
         count = rows * cols;
     }
     bool itemSource = element->attr("item-source", "false").asBool();
-    SlotLayout layout(-1, glm::vec2(), true, itemSource, nullptr, nullptr);
+    SlotLayout layout(-1, glm::vec2(), true, itemSource, nullptr, nullptr, nullptr);
     if (element->has("pos")) {
         layout.position = element->attr("pos").asVec2();
     }
+    if (element->has("updatefunc")) {
+        layout.updateFunc = readSlotFunc(view, reader, element, "updatefunc");
+    }
     if (element->has("sharefunc")) {
         layout.shareFunc = readSlotFunc(view, reader, element, "sharefunc");
     }

src/frontend/InventoryView.h

@@ -43,6 +43,7 @@ struct SlotLayout {
     glm::vec2 position;
     bool background;
     bool itemSource;
+    slotcallback updateFunc;
     slotcallback shareFunc;
     slotcallback rightClick;
     int padding = 0;
@@ -51,6 +52,7 @@ struct SlotLayout {
                glm::vec2 position, 
                bool background,
                bool itemSource,
+               slotcallback updateFunc,
                slotcallback shareFunc,
                slotcallback rightClick);
 };

src/frontend/hud.cpp

@@ -145,7 +145,7 @@ std::shared_ptr<InventoryView> Hud::createContentAccess() {
         accessInventory->getSlot(id-1).set(ItemStack(id, 1));
     }
 
-    SlotLayout slotLayout(-1, glm::vec2(), false, true, 
+    SlotLayout slotLayout(-1, glm::vec2(), false, true, nullptr,
     [=](uint, ItemStack& item) {
         auto copy = ItemStack(item);
         inventory->move(copy, indices);
@@ -165,7 +165,7 @@ std::shared_ptr<InventoryView> Hud::createContentAccess() {
 std::shared_ptr<InventoryView> Hud::createHotbar() {
     auto inventory = player->getInventory();
 
-    SlotLayout slotLayout(-1, glm::vec2(), false, false, nullptr, nullptr);
+    SlotLayout slotLayout(-1, glm::vec2(), false, false, nullptr, nullptr, nullptr);
     InventoryBuilder builder;
     builder.addGrid(10, 10, glm::vec2(), 4, true, slotLayout);
     auto view = builder.build();
@@ -185,7 +185,7 @@ Hud::Hud(Engine* engine, LevelFrontend* frontend, Player* player)
 {
     interaction = std::make_unique<InventoryInteraction>();
     grabbedItemView = std::make_shared<SlotView>(
-        SlotLayout(-1, glm::vec2(), false, false, nullptr, nullptr)
+        SlotLayout(-1, glm::vec2(), false, false, nullptr, nullptr, nullptr)
     );
     grabbedItemView->bind(
         0,