JScrollPane無法正確伸展​​GridBagLayout中的水平距離

Question

我已經看到關於此主題的其他帖子，但他們發現的解決方案並不適用於我。我正在設置加權值，並使用c.fill = GridBagConstraints.BOTH約束。

我包含了我的全部GUI代碼，以防萬一我的錯誤來自GridBagLayout以外的其他東西。

我希望右側的可滾動文本塊擴展GUI內的剩餘空間，並且我已經設置了所有應該歸因於該變量的變量，但仍然無法正常工作。我究竟做錯了什麼？

我的結果：

import java.awt.*; 
import javax.swing.*; 

public class TestCode extends JFrame { 
    JTextArea textArea = new JTextArea(); 
    JComboBox <String> typeComboBox; 
    JTextField searchField; 
    JTextField fileField; 

    public TestCode(){ 

     setTitle ("GUI Test"); 
     setSize (600, 300); 
     setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); 
     setVisible (true); 

     JScrollPane scrollPane = new JScrollPane(textArea); 

     JButton readButton = new JButton("Read File"); 
     JButton displayButton = new JButton("Display"); 
     JButton searchButton = new JButton("Search"); 


     searchField = new JTextField(10); 
     fileField = new JTextField(15); 

     typeComboBox = new JComboBox <String>(); 
     typeComboBox.addItem("Index"); 
     typeComboBox.addItem("Type"); 
     typeComboBox.addItem("Name"); 




     JPanel container = new JPanel(); 
      container.setLayout(new GridBagLayout()); 
      container.setPreferredSize(new Dimension(250, 100)); 
     JPanel filePanel = new JPanel(); 
      filePanel.setLayout(new BoxLayout(filePanel, BoxLayout.Y_AXIS)); 
      filePanel.add(new JLabel("Source file", SwingConstants.LEFT)); 
       JPanel filePanelTop = new JPanel(); 
        filePanelTop.setLayout(new FlowLayout(FlowLayout.LEFT)); 
        filePanelTop.add(fileField); 
       JPanel filePanelBottom = new JPanel(); 
        filePanelBottom.setLayout(new FlowLayout(FlowLayout.RIGHT)); 
        filePanelBottom.add(readButton); 
        filePanelBottom.add(displayButton); 
      filePanel.add(filePanelTop); 
      filePanel.add(filePanelBottom); 
      filePanel.setMaximumSize(filePanel.getPreferredSize()); 
      filePanel.setBorder(BorderFactory.createTitledBorder("Import File")); 
     JPanel searchPanel = new JPanel(); 
      searchPanel.setLayout(new BoxLayout(searchPanel, BoxLayout.Y_AXIS)); 
      searchPanel.add(new JLabel("Search target", SwingConstants.LEFT)); 
       JPanel searchPanelTop = new JPanel(); 
        searchPanelTop.setLayout(new FlowLayout(FlowLayout.LEFT)); 
        searchPanelTop.add(searchField); 
        searchPanelTop.add(typeComboBox); 
      searchPanel.add(searchPanelTop); 
      searchPanel.add(searchButton); 
      searchPanel.setMaximumSize(searchPanel.getPreferredSize()); 
      searchPanel.setBorder(BorderFactory.createTitledBorder("Search Objects")); 

      GridBagConstraints c = new GridBagConstraints(); 
      c.gridx = 0; 
      c.gridy = 0; 
      container.add(filePanel, c); 
      c.gridx = 0; 
      c.gridy = 1; 
      container.add(searchPanel, c); 
      c.gridx = 1; 
      c.gridy = 0; 
      c.weightx = 1.0; 
      c.weighty = 1.0; 
      c.gridwidth = GridBagConstraints.REMAINDER; 
      c.gridheight = GridBagConstraints.REMAINDER; 
      c.fill = GridBagConstraints.BOTH; 
      c.anchor = GridBagConstraints.NORTHWEST; 
      container.add(scrollPane, c); 

     add(container, BorderLayout.WEST); 

     validate(); 

    } // end method toString 

    public static void main(String[] args){ 
     TestCode run = new TestCode(); 
    } 
} // end class Treasure 

Answer 1

//add(container, BorderLayout.WEST); 
add(container); 

西contrains組件以它們的優選寬度。默認情況下，CENTER允許組件擴展以填充可用空間。

此外，您的代碼的主要結構是錯誤的。您應該先將所有組件添加到幀中，然後調用：

frame.pack(); 
frame.setVisible(true); 

然後不需要驗證（）。