/// <summary>
/// Swap <see cref="UIItem"/>s from one <see cref="UIInventory"/> to the other.
/// </summary>
private void SwapUIItems(UIItem uiItem, bool fromPlayer, EventArg3 <Item, Trader, Trader> tradeEvent)
{
// Check if the trade was successful:
// (I know this is a very ugly way of doing it, but I don't want to introduce new EventArg(s) with boolean as their return type...)
// If we are transfering the item FROM the player, then the player shouldn't have the item in the inventory if the trade was successful and vice versa for the merchant.
if ((fromPlayer && !PlayerController.Player.Inventory.Items.Contains(uiItem.Item)) || (!fromPlayer && PlayerController.Player.Inventory.Items.Contains(uiItem.Item)))
{
//Remove the old UIItem:
if (fromPlayer)
{
uiPlayerInventory.ItemGrid.RemoveUIElement(uiItem);
}
else
{
uiMerchantInventory.ItemGrid.RemoveUIElement(uiItem);
}
//Assign a new instance to the reference that looks the same etc.:
uiItem = new UIItem(new Transform(uiItem.Transform.Size), uiItem.Sprite, screen, uiItem.Item);
//Swap the Trader references in the EventArg:
tradeEvent.SetArguments(
tradeEvent.Arg1, //Keep the item reference
tradeEvent.Arg3, //Switch reference
tradeEvent.Arg2); //Switch reference
//Create a new event list where the new swapped trade event and an entirely new EventArg3 can be created.
EventArgList onButtonClickEvents = new EventArgList(
tradeEvent,
new EventArg3 <UIItem, bool, EventArg3 <Item, Trader, Trader> >(SwapUIItems, uiItem, !fromPlayer /* We want to trigger the opposite reaction */, tradeEvent)
);
//Create the purchase/sell button whether or not it came from the player's inventory.
if (fromPlayer)
{
uiItem.CreatePurchaseButton(onButtonClickEvents);
}
else if (uiItem.Item.CanSell)
{
uiItem.CreateSellButton(onButtonClickEvents);
}
//Add the new UIItem to the right grid:
if (fromPlayer)
{
uiMerchantInventory.ItemGrid.AddUIElement(uiItem);
}
else
{
uiPlayerInventory.ItemGrid.AddUIElement(uiItem);
}
}
}