Java GridBag佈局不正常

Question

我有兩個表格和兩個按鈕。我想要table-1在第一列和3個單位的寬度，然後我希望表格右側的兩個按鈕更窄（寬度爲1單位），我想要頂部的按鈕1和頂部的按鈕2底端。現在在這些按鈕的右邊，我想要另一個表格（表格-2）再寬達3個單位。爲了實現這一點，我使用了以下約束：

 //table1 
     c = new GridBagConstraints(0, 0, 3, 2, 1, 1, 
       GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, 
       new Insets(0, 0, 0, 0), 0, 0); 
     c.fill = GridBagConstraints.BOTH; 
     outerPanel.add(all_app_scrollpane, c); 

     //button1 
     c = new GridBagConstraints(3, 0, 1, 1, 1, 1, 
       GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, 
       new Insets(0, 0, 0, 0), 0, 0); 
     outerPanel.add(addButton, c); 

     //button2 
     c = new GridBagConstraints(3, 1, 1, 1, 1, 1, 
       GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, 
       new Insets(0, 0, 0, 0), 0, 0); 
     outerPanel.add(removeButton, c); 

     //table2 
     c = new GridBagConstraints(4, 0, 3, 2, 1, 1, 
       GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, 
       new Insets(0, 0, 0, 0), 0, 0); 
     c.fill = GridBagConstraints.BOTH; 
     outerPanel.add(curr_app_scrollpane, c); 

讓我們來看看table1的GridBagCOnstraints。據我所知，第一個參數指出它將從0列開始，並將是3列寬（第三個參數）。 然後button1將從第三列開始，並將是一列寬。但我認爲我知道錯誤，因爲結果與我預期的截然不同。

我想這些按鈕更窄和表寬得多。我怎樣才能做到這一點？我想用GridBag來完成這個任務，因爲這個小面板只是一個非常複雜的GUI的一小部分，整個GUI都是使用gridbag設計的。所以我不想改變編碼風格。

Answer 1

您必須設置佈局的增長設置（weightx），以便只有左側和右側列正在增長。

像這樣：

contentPane.setLayout(new GridBagLayout()); 
    ((GridBagLayout)contentPane.getLayout()).columnWidths = new int[] {0, 0, 0, 0}; 
    ((GridBagLayout)contentPane.getLayout()).rowHeights = new int[] {0, 0, 10, 0, 0, 0}; 
    ((GridBagLayout)contentPane.getLayout()).columnWeights = new double[] {1.0, 0.0, 1.0, 1.0E-4}; 
    ((GridBagLayout)contentPane.getLayout()).rowWeights = new double[] {1.0, 0.0, 0.0, 0.0, 1.0, 1.0E-4}; 

    //---- leftBtn ---- 
    leftBtn.setText("left Button"); 
    contentPane.add(leftBtn, new GridBagConstraints(0, 0, 1, 5, 0.0, 0.0, 
     GridBagConstraints.CENTER, GridBagConstraints.BOTH, 
     new Insets(0, 0, 0, 0), 0, 0)); 

    //---- rightBtn ---- 
    rightBtn.setText("right Button"); 
    contentPane.add(rightBtn, new GridBagConstraints(2, 0, 1, 5, 0.0, 0.0, 
     GridBagConstraints.CENTER, GridBagConstraints.BOTH, 
     new Insets(0, 0, 0, 0), 0, 0)); 

    //---- addBtn ---- 
    addBtn.setText("add Button"); 
    contentPane.add(addBtn, new GridBagConstraints(1, 1, 1, 1, 0.0, 0.0, 
     GridBagConstraints.CENTER, GridBagConstraints.BOTH, 
     new Insets(0, 0, 0, 0), 0, 0)); 

    //---- remBtn ---- 
    remBtn.setText("rem Button"); 
    contentPane.add(remBtn, new GridBagConstraints(1, 3, 1, 1, 0.0, 0.0, 
     GridBagConstraints.CENTER, GridBagConstraints.BOTH, 
     new Insets(0, 0, 0, 0), 0, 0)); 

因此給出了：

問候弗洛裏安

編輯：下面一個從IDE截圖，與按鍵之間的額外空間：

Answer 2

在button1和button2上，將它們的weightx減小到0.0。事情是這樣的：

import java.awt.Component; 
import java.awt.GridBagConstraints; 
import java.awt.GridBagLayout; 
import java.util.Vector; 

import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.JScrollPane; 
import javax.swing.JTable; 
import javax.swing.SwingUtilities; 
import javax.swing.table.DefaultTableModel; 

public class Test4 { 

    protected void initUI() { 
     JFrame frame = new JFrame("test"); 
     JPanel panel = new JPanel(new GridBagLayout()); 
     GridBagConstraints gbc = new GridBagConstraints(); 
     gbc.fill = GridBagConstraints.BOTH; 
     gbc.weightx = 0.5; 
     gbc.weighty = 1.0; 
     gbc.gridheight = 2; 
     panel.add(getTable(), gbc); 
     gbc.gridx = 2; 
     panel.add(getTable(), gbc); 

     GridBagConstraints gbc2 = new GridBagConstraints(); 
     gbc2.fill = GridBagConstraints.NONE; 
     gbc2.anchor = GridBagConstraints.CENTER; 
     gbc2.gridx = 1; 
     gbc2.weighty = 1.0; 
     panel.add(new JButton("Button 1"), gbc2); 
     gbc2.gridy = 1; 
     panel.add(new JButton("Button 2"), gbc2); 
     frame.add(panel); 
     frame.pack(); 
     frame.setVisible(true); 
    } 

    private Component getTable() { 
     Vector<Vector<String>> data = new Vector<Vector<String>>(); 
     for (int i = 0; i < 10; i++) { 
      Vector<String> row = new Vector<String>(); 
      for (int j = 0; j < 3; j++) { 
       row.add("Cell (" + i + "," + j + ")"); 
      } 
      data.add(row); 
     } 
     Vector<String> columns = new Vector<String>(); 
     columns.add("Column 1"); 
     columns.add("Column 2"); 
     columns.add("Column 3"); 
     DefaultTableModel model = new DefaultTableModel(data, columns); 
     JTable table = new JTable(model); 
     JScrollPane scroll = new JScrollPane(table); 
     scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED); 
     scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED); 
     return scroll; 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       new Test4().initUI(); 
      } 
     }); 
    } 
} 

很抱歉的約束重用，這是不好的可讀性。