Question

我遇到问题，我实施了BorderLayout JPanel。如果我尝试在北区移动按钮作为示例，它将保留在默认位置。这是我的代码：

public class Window extends JFrame{


Panel pan = new Panel();
JPanel container, north,south, west;
public JButton ip,print,cancel,start,ok;
JTextArea timeStep;
JLabel legend;
double time;
double temperature=0.0;

public static void main(String[] args) {
    new Window();

}

public Window()
{
    System.out.println("je suis là");
    this.setSize(700,400);
    this.setLocationRelativeTo(null);
    this.setResizable(true);
    this.setTitle("Assignment2 - CPU temperature");
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    container = new JPanel(new BorderLayout());


    north = new JPanel();
    ip = new JButton ("New");
    ip.setPreferredSize(new Dimension(100,50));
    ip.setLocation(0, 0);
    north.add(ip);
    print = new JButton ("Print");
    north.add(print);

    north.add(new JLabel("Time Step (in s): "));
    timeStep = new JTextArea("10",1,5);
    north.add(timeStep);
    start = new JButton("OK");
    ListenForButton lForButton = new ListenForButton();
    start.addActionListener(lForButton);
    north.add(start);


    south = new JPanel();
    legend = new JLabel("Legends are here");
    south.add(legend);

    west = new JPanel();
    JLabel temp = new JLabel("°C");
    west.add(temp);

    container.add(north, BorderLayout.NORTH);
    container.add(west,BorderLayout.WEST);
    container.add(pan, BorderLayout.CENTER);
    container.add(south, BorderLayout.SOUTH);

    this.setContentPane(container);
    this.setVisible(true);
}

我想要例如我的＆＃34; New＆＃34;按钮位于窗口的左上角，写入＆＃34; ip.setLocation（0,0）;＆＃34;

Window

它默认保留在中心..

有什么想法吗？

Answer 1

Oracle Documentation about BorderLayout

边框布局布置一个容器，安排并调整其大小适合五个地区的组成部分：北，南，东，西，和中心。

解决方案

private void getData(Query ref){
    ref.addChildEventListener(new ChildEventListener() {
        @Override
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {
            Log.i(TAG, "onChildAdded");
        }

        @Override
        public void onChildChanged(DataSnapshot dataSnapshot, String s) {
            Log.i(TAG, "onChildChanged");
        }

        @Override
        public void onChildRemoved(DataSnapshot dataSnapshot) {
            Log.i(TAG, "onChildRemoved");
        }

        @Override
        public void onChildMoved(DataSnapshot dataSnapshot, String s) {
            Log.i(TAG, "onChildMoved");
        }

        @Override
        public void onCancelled(FirebaseError firebaseError) {
            Log.i(TAG, "onCancelled");
        }
    });
}

北面板现在由以下两部分组成：

north = new JPanel(); north.setLayout(new BorderLayout()); ip = new JButton ("New"); ip.setPreferredSize(new Dimension(100,50)); print = new JButton ("Print"); north.add(ip, BorderLayout.WEST); JPanel centerPanel = new JPanel(); centerPanel.add(print); centerPanel.add(new JLabel("Time Step (in s): ")); timeStep = new JTextArea("10",1,5); centerPanel.add(timeStep); start = new JButton("OK"); centerPanel.add(start); north.add(centerPanel, BorderLayout.CENTER);（ip）和JButton（centerPanel）包含其余组件。

输出

Answer 2

您要做的是使用AbsoluteLayout而不是BorderLayout，BorderLayout使用Cardinal方向在窗格上设置对象，例如North，East，South，West和Center 。您可能希望查看用于BorderLayout的JavaDoc。

例如，您需要将north面板设置为BorderLayout()

north.setLayout(new BorderLayout());

BorderLayout，无法设置手动位置 - SWING Java

2 个答案:

Oracle Documentation about BorderLayout

解决方案

输出