JLayeredPane和MouseAdapter问题

Question

我目前正在尝试为一个名为Carcassone的游戏创建一个应用程序，但是我在将JLayeredPane与MouseAdapters结合使用时遇到了问题。

目前，我有一个JLayeredPane，它包含一个带有GridLayout的JPanel，用作游戏板。GridLayout的每个单元格都包含一个JPanel，其中包含一个JLabel，用于表示电路板上的图块。(一个空的磁贴就是一个带有黑色方块的JLabel )。

我在JLayeredPane中添加了一个自定义鼠标适配器(TileMouseAdapter)，它允许用户在游戏板上移动磁贴(鼠标按下-拖动-释放)或旋转磁贴(鼠标单击)。(要测试单击“下一平铺”按钮并在出现的平铺上移动，单击“提交”按钮后，如果是有效移动，则平铺将不再可拖动)。在我添加下一部分之前，这一切都工作得很好。

现在，我想向屏幕顶部的JLayeredPane添加一个单独的JPanel。这一部分应该放置玩家可以放置在瓷砖上的游戏棋子。我还希望JPanel能够容纳游戏棋子，这样玩家就可以将棋子拖到瓷砖上。但是，当我创建此面板并将其添加到JLayeredPane中时，上一节中的鼠标适配器不再正常工作。例如，如果您单击磁贴的底部，它将不再识别您正在单击磁贴。如果您单击每个磁贴的上半部分，它将仅选择磁贴。此外，如果您单击磁贴的底部，有时它会选择下面的磁贴。即，似乎选择瓦片的机制似乎向上移动了大约半个瓦片。有人能想出这个问题的解释/可能的解决方法吗？谢谢!

下面的代码是我用来创建包含棋盘JPanel (myBoardPanel)和游戏棋子面板(makeMeeplePanel())的JLayeredPane的代码。

        private JLayeredPane makeBoardPanel() {
    JLayeredPane layeredPane = new JLayeredPane();
    layeredPane.setLayout(new BorderLayout());
    myBoardPanel = new CarcassoneBoardPanel(layeredPane);
    layeredPane.add(makeMeeplePanel(), BorderLayout.NORTH, JLayeredPane.DEFAULT_LAYER);
    layeredPane.add(myBoardPanel, BorderLayout.CENTER, JLayeredPane.DEFAULT_LAYER);

    TileMouseAdapter tileMouseAdapter = new TileMouseAdapter(layeredPane);
    //MeepleMouseAdapter meepleMouseAdapter = new MeepleMouseAdapter(layeredPane);

    layeredPane.addMouseListener(tileMouseAdapter);
    layeredPane.addMouseMotionListener(tileMouseAdapter);
    //layeredPane.addMouseListener(meepleMouseAdapter);
    //layeredPane.addMouseMotionListener(meepleMouseAdapter);
    return layeredPane; 
}

这是我为游戏板定制的鼠标适配器：

    package gui;
    import java.awt.Component;
    import java.awt.event.MouseAdapter;
    import java.awt.event.MouseEvent;
    import javax.swing.JLayeredPane;
    import javax.swing.JPanel;

    import tiles.*;

    public class TileMouseAdapter extends MouseAdapter {
private JLayeredPane myLayeredPane;
private CarcassoneBoardPanel myBoard;
private Tile dragLabel;
private JPanel clickedPanel;


public TileMouseAdapter(JLayeredPane layeredPane) {
    myLayeredPane = layeredPane;
    myBoard = (CarcassoneBoardPanel) layeredPane.getComponents()[1];
}

private void reset() {
    if (dragLabel != null) {
        myLayeredPane.remove(dragLabel);
        myLayeredPane.revalidate();
        myLayeredPane.repaint();
    }
    dragLabel = null;
    clickedPanel = null;
} 

@Override
public void mouseClicked(MouseEvent event) {
    clickedPanel = (JPanel) myBoard.getComponentAt(event.getPoint());
    if (clickedPanel == null) {
        reset();
        return;
    }
    Component[] components = clickedPanel.getComponents();
    if (!(components[0] instanceof Tile) || components[0] instanceof EmptyTile || !((Tile) components[0]).isDraggable()) {
        return;
    }

    dragLabel = (Tile) components[0];
    dragLabel.rotate();
    clickedPanel.revalidate();
    clickedPanel.repaint();
    reset();
}

@Override 
public void mousePressed(MouseEvent event) {
    clickedPanel = (JPanel) myBoard.getComponentAt(event.getPoint());
    System.out.println(event.getPoint());
    if (clickedPanel == null) {
        reset();
        return;
    }
    Component[] components = clickedPanel.getComponents();
    if (!(components[0] instanceof Tile) || (components[0] instanceof EmptyTile) || !((Tile) components[0]).isDraggable()) {
        return;
    }
    dragLabel = (Tile) components[0];
    clickedPanel.remove(dragLabel);
    clickedPanel.add(new EmptyTile(dragLabel.getRow(), dragLabel.getCol()));
    clickedPanel.revalidate();
    clickedPanel.repaint();

    int x = event.getPoint().x - dragLabel.getWidth() / 2;
    int y = event.getPoint().y - dragLabel.getHeight() / 2;
    dragLabel.setLocation(x, y);
    try {
        myLayeredPane.add(dragLabel, JLayeredPane.DRAG_LAYER);
        myLayeredPane.repaint();
    } catch (IllegalArgumentException e) {
        //TODO: deal with this? 
        //gives error for some unknown reason, but doesnt effect anything? ignore...dumb error cus jswing sucks
    }
}

@Override
public void mouseDragged(MouseEvent event) {
    if (dragLabel == null) {
        return;
    }
    int x = event.getPoint().x - dragLabel.getWidth() / 2;
    int y = event.getPoint().y - dragLabel.getHeight() / 2;
    dragLabel.setLocation(x, y);
    myLayeredPane.revalidate();
}

@Override
public void mouseReleased(MouseEvent event) {
    //TODO: make sure cannot place tile on already occupied panel...
    if (dragLabel == null || !dragLabel.isDraggable()) {
        return;
    }
    myLayeredPane.remove(dragLabel);
    myLayeredPane.revalidate();
    myLayeredPane.repaint();


    JPanel droppedPanel = (JPanel) myBoard.getComponentAt(event.getPoint());
    if (droppedPanel == null) {
        clickedPanel.removeAll();
        clickedPanel.add(dragLabel);
        clickedPanel.revalidate();
        reset();
        return;
    }

    dragLabel.setPosition(((Tile) droppedPanel.getComponents()[0]).getRow(), ((Tile) droppedPanel.getComponents()[0]).getCol());
    droppedPanel.removeAll();
    droppedPanel.add(dragLabel);
    droppedPanel.revalidate();
    reset();
}

}

如果您需要更多信息/代码，请让我知道。这是我第一次使用这个网站，所以很抱歉如果我没有提供足够的解释，等等…谢谢!

Answer 1

你的问题在这里：

@Override
public void mouseClicked(MouseEvent event) {
    clickedPanel = (JPanel) myBoard.getComponentAt(event.getPoint());

event.getPoint()将返回一个相对于注册了鼠标侦听器的layeredPane的Point。myBoard.getComponentAt()将在相对于myBoard组件的位置返回组件，该组件位于layeredPane.getComponents()[1]的分层窗格中。