Question

以下是我正在使用的完整相关代码：

    JPanel songDetails = new JPanel(new GridBagLayout() ); 

    GridBagConstraints constraints = new GridBagConstraints();   
        constraints.fill = GridBagConstraints.BOTH; 
        constraints.weightx = 1.0; 
        constraints.gridx = 0; 
        constraints.gridy = 0;  

    for(int i = 0; i < songOptions.length; i++, constraints.gridx++){ 
        songDetails.add(this.buttons[i],constraints);
    }

    constraints.gridy = 1; 

    for(int i = 0; i < songInfo.length; i++, constraints.gridy++){ 

        constraints.gridwidth = 1; 
        constraints.gridx = 0; 
        songDetails.add(this.labels[i],constraints); 

        constraints.gridwidth = GridBagConstraints.REMAINDER; 
        constraints.gridx = 1; 
        songDetails.add(this.fields[i],constraints); 
    }


    JList<Song> list = new JList<Song>(this.lib); //data has type Object[] 
        list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        list.setLayoutOrientation(JList.VERTICAL);
        list.setVisibleRowCount(5);


    JScrollPane listScroller = new JScrollPane();
        listScroller.setViewportView(list);

    constraints.fill = GridBagConstraints.BOTH; 
    constraints.weightx = 1.0; 
    constraints.gridheight = GridBagConstraints.RELATIVE; 
    constraints.gridwidth = GridBagConstraints.REMAINDER; 
    constraints.gridx = 0; 
    constraints.gridy = 0;   
    constraints.anchor = GridBagConstraints.NORTHWEST;
    setLayout(new GridBagLayout());
        add(listScroller,constraints); 
        constraints.gridy++; 
        add(songDetails, constraints);

在main中，我按如下方式初始化帧：

    SongLib myLibrary = new SongLib("Song Library", pathName );
        myLibrary.setVisible(true);
        myLibrary.setSize(300, 250);// Sets the Frame Size
        myLibrary.setMinimumSize(new Dimension(300,250));
        myLibrary.setResizable(true);//Makes the size not fixed
        myLibrary.setLocationRelativeTo(null); // Make the Frame appear centered
        myLibrary.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//Tells program to exit when the 'x'(close) button is pressed

我的问题是，当我展开框架时，它会水平扩展（宽度），但不会垂直扩展。我认为改变填充值会对我有用，但事实并非如此。此外，如果可能在发生此更改时更改字体大小。

如果它不会太复杂，我还想让用户能够改变每个帧的相对大小。我认为需要一些动作监听器。如果是的话我会稍后再看，但是如果有什么东西我会忽略它会非常感激！

Answer 1

请注意您的代码：

GridBagConstraints constraints = new GridBagConstraints();   
    constraints.fill = GridBagConstraints.BOTH; 
    constraints.weightx = 1.0;   // *********
    constraints.gridx = 0; 
    constraints.gridy = 0;

你没有为GridBagConstraints设置重量，只是权重。设置它，它将垂直扩展。

如，

GridBagConstraints constraints = new GridBagConstraints();   
    constraints.fill = GridBagConstraints.BOTH; 
    constraints.weightx = 1.0; 
    constraints.weighty = 1.0;  // ***** added *****
    constraints.gridx = 0; 
    constraints.gridy = 0;

Answer 2

随着扩展问题的解决，我仍然可以告诉你，更改字体需要一个像这样的监听器：

myLibrary.addComponentListener(new java.awt.event.ComponentAdapter() 
    {
        public void componentResized(ComponentEvent e)
        {
            //Call method that changes the font of each object
        }
    });

我不太确定你改变每个帧的相对大小是什么意思（？）但如果你的意思是你的框架内的每个组件，我建议先做一些研究，然后再做（如有必要）发布一个新问题。

窗口大小更改时扩展框架以填充空间

2 个答案: