MUTATIONOFJB: Implement scroll buttons.

3 files changed, 21 insertions, 3 deletions

diff --git a/engines/mutationofjb/gui.cpp b/engines/mutationofjb/gui.cpp
index 3c8cc66aa8..41ef94af25 100644
--- a/engines/mutationofjb/gui.cpp
+++ b/engines/mutationofjb/gui.cpp
@@ -251,6 +251,10 @@ void Gui::onButtonClicked(ButtonWidget *button) {
 	if (buttonId <= BUTTON_PICKUP) {
 		const ActionInfo::Action actions[] = {ActionInfo::Walk, ActionInfo::Talk, ActionInfo::Look, ActionInfo::Use, ActionInfo::PickUp};
 		_game.setCurrentAction(actions[buttonId]);
+	} else if (buttonId == BUTTON_SCROLL_LEFT) {
+		_game.getGameData().getInventory().scrollLeft();
+	} else if (buttonId == BUTTON_SCROLL_RIGHT) {
+		_game.getGameData().getInventory().scrollRight();
 	}
 }
 
diff --git a/engines/mutationofjb/inventory.cpp b/engines/mutationofjb/inventory.cpp
index 2fa7f2ca95..2d7ba285f2 100644
--- a/engines/mutationofjb/inventory.cpp
+++ b/engines/mutationofjb/inventory.cpp
@@ -81,6 +81,18 @@ void Inventory::renameItem(const Common::String &oldName, const Common::String &
 	}
 }
 
+void Inventory::scrollLeft() {
+	if (_items.size() > VISIBLE_ITEMS) {
+		rotateItemsRight(1);
+	}
+}
+
+void Inventory::scrollRight() {
+	if (_items.size() > VISIBLE_ITEMS) {
+		rotateItemsLeft(1);
+	}
+}
+
 void Inventory::rotateItemsRight(uint n) {
 	if (_items.size() < 2) {
 		return;
@@ -121,7 +133,7 @@ void Inventory::reverseItems(uint from, uint to) {
 
 	const uint size = to - from + 1;
 	for (uint i = 0; i < size / 2; ++i) {
-		SWAP(_items[i], _items[size - i - 1]);
+		SWAP(_items[from + i], _items[to - i]);
 	}
 }
 
diff --git a/engines/mutationofjb/inventory.h b/engines/mutationofjb/inventory.h
index c22422def2..79a0d7583d 100644
--- a/engines/mutationofjb/inventory.h
+++ b/engines/mutationofjb/inventory.h
@@ -52,12 +52,14 @@ public:
 	void removeAllItems();
 	void renameItem(const Common::String &oldName, const Common::String &newName);
 
-	void rotateItemsRight(uint n);
-	void rotateItemsLeft(uint n);
+	void scrollLeft();
+	void scrollRight();
 
 	void setObserver(InventoryObserver *observer);
 
 private:
+	void rotateItemsRight(uint n);
+	void rotateItemsLeft(uint n);
 	void reverseItems(uint from, uint to);
 
 	Items _items;