为面板/框架添加大量不同的摆动对象的有效方法.(JAVA)

Question

正如标题所说,我正在努力做到.

我有一种有效的方法可以将几个相同的swing对象发布到一个帧中,方法是将它们存储在一个数组中并使用for循环添加它们,如下所示:

JLabel[] contrllabels= new JLabel[8];
contrllabels[0] = new JLabel("SCF Type: ");
contrllabels[1] = new JLabel("Units: ");
contrllabels[2] = new JLabel("Spherical Harmonics: ");
contrllabels[3] = new JLabel("Molecular Charge: ");
contrllabels[4] = new JLabel("PP: ");
contrllabels[5] = new JLabel("DFT Type: ");
contrllabels[6] = new JLabel("Max Iterations: ");
contrllabels[7] = new JLabel("Mult: ");


for(int i = 0;i<contrllabels.length;i++){
    c.gridy = i;
    frame.add(contrllabels[i],c);
}

但是如果有几种不同类型的摆动物体呢？我有几个组合框和文本字段,我希望以类似的方式添加到框架中.我使用gridbaglayout所以如果我不使用for循环,我最终会得到很多不必要的代码,因为每次我想要添加不同的对象时都会给出约束新值.

是否有一个引用数组的东西指向这些不同的对象,然后我可以迭代通过添加到框架？就像是

JTextField tf = new JTextField(5);
JComboBox cb = new JComboBox("example");

Swing[] array = {tf,cb}

for(int i = 0;i<array.length;i++){
    c.gridy = i;
    frame.add(array[i],c);
}

我知道这样的数组不存在,但有没有办法实现这样的事情？它将大大减少我的代码中的行数,并减少它的混乱.

谢谢

Answer 1

您可以使用常见超类型的数组或集合,例如JComponent的数组或ArrayList.我很好奇你是否正在使用GridBagConstraints的并行数组来处理正在添加的每个组件 - 呃.我经常使用组件数组,但通常它们是组件,如JLabel/JTextField对或JRadioButtons集群.

顺便说一句,为了我的钱,我尽可能地避免使用GridBagLayout,而是使用更加编码器友好的布局来嵌套容器.

例如,这个小GUI是使用FlowLayout,BoxLayout,BorderLayout和GridLayout的组合制作的:

保存整个GUI的大型JPanel使用BorderLayout,中间的JTextArea放置BorderLayout.CENTER,顶部的Provider JLabel和JTextField位于FlowLayout JPanel中,整体放置BorderLayout.NORTH,底部按钮位于JPanel中使用GridLayout(1,0,5,0),它在另一个使用FlowLayout的JPanel中保存,它放在GUI BorderLayout.SOUTH中,右边的东西在使用JPanel的BoxLayout中.

例如:

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Window;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.UIManager;
import javax.swing.UIManager.LookAndFeelInfo;
import javax.swing.UnsupportedLookAndFeelException;

@SuppressWarnings("serial")
public class GetLetterTextGui extends JPanel {
   private static final int TA_ROWS = 20;
   private static final int TA_COLS = 35;
   private static final int PROVIDER_FIELD_COLS = 10;
   private static final String GUI_TITLE = "Get Letter Text";
   private JList letterList;
   private JTextArea textarea = new JTextArea(TA_ROWS, TA_COLS);
   private JTextField providerField = new JTextField(PROVIDER_FIELD_COLS);
   private JCheckBox addValedictionChkBox = new JCheckBox("Add Valediction", true);

   public GetLetterTextGui() {
      letterList = new JList(new String[]{"Fe", "Fi", "Fo", "Fum"});

      providerField.setText("John Smith, MD");

      textarea.setWrapStyleWord(true);
      textarea.setLineWrap(true);

      JPanel northPanel = new JPanel();
      northPanel.add(new JLabel("Provider:"));
      northPanel.add(providerField);

      JPanel southPanel = new JPanel();
      JPanel btnPanel = new JPanel(new GridLayout(1, 0, 5, 0));
      btnPanel.add(new JButton("Copy to Clipboard"));
      btnPanel.add(new JButton("Clear"));
      btnPanel.add(new JButton(new ExitAction()));
      southPanel.add(btnPanel);

      JPanel eastPanel = new JPanel();
      eastPanel.setLayout(new BoxLayout(eastPanel, BoxLayout.PAGE_AXIS));
      eastPanel.add(new JScrollPane(letterList));
      eastPanel.add(new JPanel() {{add(addValedictionChkBox);}});

      int eb = 0;
      setBorder(BorderFactory.createEmptyBorder(eb, eb, eb, eb));
      setLayout(new BorderLayout(eb, eb));
      add(northPanel, BorderLayout.PAGE_START);
      add(eastPanel, BorderLayout.LINE_END);
      add(new JScrollPane(textarea), BorderLayout.CENTER);
      add(southPanel, BorderLayout.PAGE_END);
   }


   private class ExitAction extends AbstractAction {
      private final Object MNEMONIC = new Integer(KeyEvent.VK_X);

      public ExitAction() {
         super("Exit");
         putValue(MNEMONIC_KEY, MNEMONIC);
      }

      @Override
      public void actionPerformed(ActionEvent evt) {
         Window win = SwingUtilities.getWindowAncestor(GetLetterTextGui.this);
         win.dispose();
      }
   }

   private static void createAndShowGui() {
      GetLetterTextGui mainPanel = new GetLetterTextGui();

      JFrame frame = new JFrame(GUI_TITLE);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      try {
         for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
               UIManager.setLookAndFeel(info.getClassName());
               break;
            }
         }

         SwingUtilities.invokeLater(new Runnable() {
            public void run() {
               createAndShowGui();
            }
         });

      } catch (ClassNotFoundException e) {
         e.printStackTrace();
      } catch (InstantiationException e) {
         e.printStackTrace();
      } catch (IllegalAccessException e) {
         e.printStackTrace();
      } catch (UnsupportedLookAndFeelException e) {
         e.printStackTrace();
      }
   }
}