如何让 GridBagLayout 定位到左上角

Question

我正在尝试让 gridbaglayout 从我的 JFrame 的左上角开始。我试图在 JFrame 中使用面板来解决问题。它不起作用，它给我的结果和以前一样。我得到了我想放在左上角的面板，它从中间开始，一直在左边。 GUI problem picture 这是我的 class 和代码。

public class GraphMatchApp extends JApplet implements ActionListener
{
    private JFrame mFrame;
    private JPanel mBusinessPanel;
    private JPanel mItemsPanel;
    private JTabbedPane mTabbedPane;
    private JPanel mFramePanel;
    GridBagConstraints  mGridBagConstaints;


    public GraphMatchApp()
    {
        prepairMainFrame();
        prepairBusinessPanel();
        mGridBagConstaints.fill = GridBagConstraints.HORIZONTAL;
        mGridBagConstaints.weightx = 0.5;
        mGridBagConstaints.gridx = 0;
        mGridBagConstaints.gridy = 0;
        mGridBagConstaints.anchor = GridBagConstraints.FIRST_LINE_START;
        mFramePanel.add(mBusinessPanel,mGridBagConstaints);
        mFrame.setVisible(true);
    }
    public void prepairMainFrame()
    {
        mFrame = new JFrame();
        mFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        mFrame.setTitle("Test");

        mFrame.setSize(400,200);
        mFramePanel = new JPanel();
        mFramePanel.setLayout(new GridBagLayout());
        mFrame.add(mFramePanel, BorderLayout.LINE_START);
        mGridBagConstaints = new GridBagConstraints();
    }
    public void prepairBusinessPanel()
    {
        mBusinessPanel = new JPanel();
        Border border = BorderFactory.createEtchedBorder();
        border = BorderFactory.createTitledBorder(border,"What is your ?");
        mBusinessPanel.setBorder(border);
        JRadioButton logisticsButton = new JRadioButton("Logistics");
        logisticsButton.setMnemonic(KeyEvent.VK_L);
        logisticsButton.setActionCommand("SelectionLogistics");
        logisticsButton.setSelected(false);

        JRadioButton healthCareButton = new JRadioButton("Health care");
        healthCareButton.setMnemonic(KeyEvent.VK_H);
        healthCareButton.setActionCommand("SelectionHealthCare");
        healthCareButton.setSelected(false);

        JRadioButton transportationButton = new JRadioButton("Transp");
        transportationButton.setMnemonic(KeyEvent.VK_T);
        transportationButton.setActionCommand("SelectionTransportation");
        transportationButton.setSelected(false);

        ButtonGroup group = new ButtonGroup();
        group.add(logisticsButton);
        group.add(healthCareButton);
        group.add(transportationButton);

        logisticsButton.addActionListener(this);
        healthCareButton.addActionListener(this);
        transportationButton.addActionListener(this);

        mBusinessPanel.add(logisticsButton);
        mBusinessPanel.add(healthCareButton);
        mBusinessPanel.add(transportationButton);
    }
    public static void main( String[] args )
    {
        new GraphMatchApp();
    }

Answer 1

在您的构造函数中，设置 mGridBagConstaints.weighty = 0.5;

然后面板只占用帧可用 space 的一半。

如何让 GridBagLayout 定位到左上角

How to get GridBagLayout to position top left corner

java

user-interface

swing

jpanel

jframe