Java:允许我的广告资源中的放弃操作？

Question

对于我的游戏,我实施了一个库存系统.单击屏幕时,a MousePressedEvent将通过layers游戏中的所有对象传递给所有继承EventListener(My EventListener)的对象.该EventListener级工作正常,并使用它,如下图所示,我已经成功地让我的库存,这样你可以删除一个槽物品,将它们放回.然而,我想要做的是能够将它们从任何包含项目的插槽中取出,并将它们放在任何其他插槽中(只要目标插槽为空).我认为我所拥有的将允许这样做,因为在if声明中我没有检查如果选择了插槽,我将其添加到插槽中.但这实际上并不奏效.有任何想法吗？

Slot.java课堂代码:

public boolean onMousePressed(MousePressedEvent e) {
    Point p = new Point(Mouse.getX(), Mouse.getY());
    if (!this.getBounds().contains(p)) return false;
    boolean left = (e.getButton() == MouseEvent.BUTTON1);
    boolean right = (e.getButton() == MouseEvent.BUTTON3);
    boolean hasItems = (items.size() > 0);
    if (this.getBounds().contains(p)){
        if (right && !selected && hasItems){
            select(true);
            s = new Slot(new Vector2i(Mouse.getX(), Mouse.getY()));
            addComponent(s);
            s.add(items.get(0));
            remove(items.get(items.size() - 1));
        } else if (right && selected){
            s.add(items.get(0));
            remove(items.get(items.size() - 1));
            if (items.size() == 0) {
                setBackgroundImage(ImageUtil.getImage("/ui/panels/inventory/slot.png"));
                selected = false;
                return true;
            }
            return true;
        } else if ((left || right) && s==null) {
            return true;
        } else if (left && s != null){ //If left clicked, add to the slot from s regardless of if we are selected.
            add(s.getItems().get(0));
            s.remove(s.getItems().get(s.getItems().size() - 1));
            if (s.getItems().size() == 0){
                s.setBackgroundImage(ImageUtil.getImage("/ui/panels/inventory/slot.png"));
                removeComponent(s);
                s = null;
                selected = false;
                return true;
            }
        }
    }
    return false;
}

在伪代码中:

If (Mouse is clicked) :
  if (the mouse isn't the bounds of the slot) return false (alert we haven't handled the event)
  if (we contain the mouse cursor) :
    if (right is pressed and we aren't selected) :
      select
      create a temporary slot at the mouse location
      remove item from this slot
      add it to the temporary slot
      return true
    else if (right is pressed and we are selected) :
      add item to temporary slot
      remove item from selected slot
      return true
    else if (we press left or right while temporary slot is null) :
      return true (tell the dispatcher we have handled the event)
    //This following else if statement is supposed to add an item to a clicked slot whether that slot is selected or not, but doesn't work
    else if (left is pressed and temporary slot isn't null) :
      add the item to the clicked slot
      remove it from the temporary one
      return true
  return false if none of the above applies

谢谢 :)

Answer 1

通过在每个语句中添加打印行else if，我发现当我尝试将临时槽中的项目添加到另一个槽中时，临时槽为空。这是因为，创建临时槽时，它是由您第一次选择的槽实例创建的，因此您尝试添加的槽无法访问临时槽。为了解决这个问题，我将临时槽作为每个实例的变量移动，将其设为静态。代码现在工作正常