Question

所以，我正在尝试这样做，以便当选择“名字”或“姓氏”并在palettePane中按下鼠标时，带有我的名字或姓氏的标签出现在mouseX或mouseY上。这是我得到的，我很难过。有什么想法吗？

这是设置：

public class benNameFunc extends JPanel implements ActionListener, MouseListener{




private final JRadioButton firstName;


private final JRadioButton lastName;



private final JButton deleteButton;

private JLabel firstNameLabel;

 int x; 
 int y;

int firstOrLast = 1;

public benNameFunc(){

    lastName = new JRadioButton("Last Name");
    lastName.setPreferredSize(new Dimension(100, 50));
    lastName.setForeground(Color.RED);
    lastName.setActionCommand("last");
    lastName.setSelected(false);

    firstName = new JRadioButton("First Name");
    firstName.setPreferredSize(new Dimension(100, 50));
    firstName.setForeground(Color.RED);
    firstName.setActionCommand("first");
    firstName.setSelected(true);


    JPanel palettePane = new JPanel(new BorderLayout());
    palettePane.setPreferredSize(new Dimension (800, 500));

    add(palettePane, BorderLayout.CENTER);

    firstNameLabel = new JLabel("Ben");     
    firstNameLabel.setPreferredSize(new Dimension(100, 10));
    firstNameLabel.setForeground(Color.WHITE);
    firstNameLabel.setVisible(true);
    palettePane.add(firstNameLabel);

    buttonPane.setBackground(Color.BLACK);

     firstName.addActionListener(this);
     lastName.addActionListener(this);
     deleteButton.addActionListener(this);

     palettePane.addMouseListener(this);



}

然后是动作代码：

public void actionPerformed(ActionEvent e) {

    if (e.getActionCommand() == "first") {
        firstOrLast = 1;
    } else if (e.getActionCommand() == "last") {
        firstOrLast = 2;
    } else if (e.getSource() == deleteButton){
        firstOrLast = 3;
    }

}


public void mousePressed(MouseEvent e) {


    x = e.getX(); 
    y = e.getY();

    switch (firstOrLast) {
    case 1:  
        firstNameLabel.setLocation(x, y);

    break;
    case 2: 

    break;
    case 3:

    break;
    default: 
    break;
}

...

Answer 1

palettePane目前处于布局管理器的控制之下，这意味着当重新验证容器时，任何更改位置的尝试都很可能会失败或被取代...将它的布局管理器设置为{{1} }
当您想要自己进行布局控制时，使用null无济于事。相反，您需要使用组件preferredSize方法代替... setSize
您的firstNameLabel.setSize(firstNameLabel.getPreferredSize());比较错误...

例如，你正在......

String

你应该做什么......

if (e.getActionCommand() == "first") {
    firstOrLast = 1;
} else if (e.getActionCommand() == "last") {
    firstOrLast = 2;
} else if (e.getSource() == deleteButton) {
    firstOrLast = 3;
}

<强>买者

if (e.getActionCommand().equals("first")) { firstOrLast = 1; } else if (e.getActionCommand().equals("last")) { firstOrLast = 2; } else if (e.getSource() == deleteButton) { firstOrLast = 3; }布局非常难以解决问题。请确保这实际上是您想要做的。

示例

null

尝试使用Mouselistener为JPanel添加标签

1 个答案: