java - 在 JFileChooser 上使用 JComboBox 列出以组合框第一行文本开头的所有文件

Question

我设法在 JFileChooser 上获得删除按钮。我弄清楚了按钮应该放在哪里。在此过程中，我通过弄乱 getComponents() 方法发现，在其中搜索文件的 JTextField 并将其替换为 JComboBox。计划是让它列出以第一行中的文本开头的所有文件，这是唯一可以在 JComboBox 上编辑的文件，否则它是不可编辑的，并且可以选择另一行，它将把第一行的项目文本设置为该项目的文本。 (并且还更新了JCombobBox，尽管我认为我还没有实现该部分，尽管一个简单的方法调用应该可以做到这一点，但是，无论如何，我在Java编程论坛上尝试了posting这个。

它显示了其中的项目，但不让它随着键入而更新。相反，它显示目录中的所有项目。另外，当我选择一个项目时，它会删除第一行并将第一行的文本设置为该项目。然而，它现在使第一行无法编辑，我认为或者做了一些古怪的事情。

它删除了第一行，因为开发 JComboBox 类的杰出人士懒得创建 setItmeAt(Object item, int index) 方法，而只创建 getItemAt(int索引)。因此，我必须获取该项目的文本，将其放入变量中，删除第一行的项目，然后在第一行读取包含所选项目文本的项目。

我担心我的代码可能太长，所以我把它缩短了，尽管今天这样做在 Java 编程论坛上没有得到任何结果，因为问题出在 JComboBox 和文件上类和东西。

package addressbook.gui;

import javax.swing.JFileChooser;
import java.io.File;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JOptionPane;
import javax.swing.JComboBox;
import javax.swing.event.DocumentListener;
import javax.swing.event.DocumentEvent;
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Window;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.util.ArrayList;
import java.util.List;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JTextField;
import javax.swing.MutableComboBoxModel;
import javax.swing.SwingUtilities;
import javax.swing.plaf.basic.BasicComboBoxEditor;
import javax.swing.plaf.basic.BasicComboBoxRenderer;
import javax.swing.plaf.basic.BasicComboPopup;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

public class FileChooserWithDelete extends JFileChooser
{

   private String textFieldString;
   private JIntelligentComboBox comboBox;
   private DefaultComboBoxModel dcm;

   public FileChooserWithDelete()
   {
      super("./");
      dcm = new DefaultComboBoxModel();


      java.io.File f = getCurrentDirectory();

      java.io.File[] files = f.listFiles();

      for (int i =0; i < files.length; i++)
      {

         dcm.addElement(new Object[] {files[i].getName(), "", 0});

      }


      JButton delete = new JButton("Delete");
      delete.setToolTipText("Delete file");

      comboBox = new JIntelligentComboBox(dcm);


      addPropertyChangeListener(
            new PropertyChangeListener() {
               public void propertyChange(PropertyChangeEvent evt) {
                  if (JFileChooser.DIRECTORY_CHANGED_PROPERTY.equals(evt.getPropertyName())) {
                     JFileChooser chooser = (JFileChooser) evt.getSource();
                     java.io.File oldDir = (java.io.File) evt.getOldValue();
                     java.io.File newDir = (java.io.File) evt.getNewValue();

                     java.io.File curDir = chooser.getCurrentDirectory();
                     System.out.println(curDir.getName());


                     dcm.removeAllElements();



                     java.io.File[] moreFiles = curDir.listFiles();

                     System.out.println("Obama is a loser!");


                     for (int i =0; i < moreFiles.length; i++)
                     {



                        dcm.addElement(new Object[] {moreFiles[i].getName(), "", 0});


                     }


                     comboBox.init();


                  }
               }
            });




      java.awt.Container cont = (java.awt.Container) (getComponents()[3]);

      java.awt.Container cont2 = (java.awt.Container) (cont.getComponents()[3]);
      java.awt.Container cont3 = (java.awt.Container) (cont.getComponents()[0]);

      cont3.remove(1);

      cont3.add(comboBox, 1);





      delete.addActionListener(
            new ActionListener()
            {




               public void actionPerformed(ActionEvent e)
               {

                  File f= getSelectedFile();

                  java.awt.Container cont = (java.awt.Container) (getComponents()[3]);

                  java.awt.Container cont2 = (java.awt.Container) (cont.getComponents()[3]);
                  java.awt.Container cont3 = (java.awt.Container) (cont.getComponents()[0]);
                  //javax.swing.JTextField jtf = (javax.swing.JTextField) (cont3.getComponents()[1]);

                  String text = (String) comboBox.getItemAt(0);

                  if (f == null)
                     f = new File("./" + text);



                  int option =  JOptionPane.showConfirmDialog(null, "Are you sure you wnat to delete?", "Delete file " + f.getName() + "?", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

                  if (option == JOptionPane.YES_OPTION)
                  {

                     if (!f.exists() || text == null)
                     {
                        JOptionPane.showMessageDialog(null, "File doesn't exist.", "Could not find file.", JOptionPane.ERROR_MESSAGE);
                        cancelSelection();

                     }

                     else
                     {
                        f.delete();

                        cancelSelection();
                     }





                  }
               }});



      cont2.setLayout(new java.awt.FlowLayout());


      //((java.awt.Container) (getComponents()[3])).add(delete);
      cont2.add(delete);

      //cont2.add(delete);





   }




   protected class JIntelligentComboBox extends JComboBox {

      private List<Object> itemBackup = new ArrayList<Object>();

      public JIntelligentComboBox(MutableComboBoxModel aModel) {
         super(aModel);
         init();
      }

      private void init() {
         this.setRenderer(new searchRenderer());
         this.setEditor(new searchComboBoxEditor());
         this.setEditable(true);
         int size = this.getModel().getSize();
         Object[] tmp = new Object[this.getModel().getSize()];
         for (int i = 0; i < size; i++) {
            tmp[i] = this.getModel().getElementAt(i);
            itemBackup.add(tmp[i]);
         }
         this.removeAllItems();
         this.getModel().addElement(new Object[]{"", "", 0});
         for (int i = 0; i < tmp.length; i++) {
            this.getModel().addElement(tmp[i]);
         }
         final JTextField jtf = (JTextField) this.getEditor().getEditorComponent();
         jtf.addKeyListener(
               new KeyAdapter() {

                  @Override
                  public void keyReleased(KeyEvent e) {
                     searchAndListEntries(jtf.getText());
                  }
               });
      }

      @Override
      public MutableComboBoxModel getModel() {
         return (MutableComboBoxModel) super.getModel();
      }

      private void searchAndListEntries(Object searchFor) {
         List<Object> found = new ArrayList<Object>();
         for (int i = 0; i < this.itemBackup.size(); i++) {
            Object tmp = this.itemBackup.get(i);
            if (tmp == null || searchFor == null) {
               continue;
            }
            Object[] o = (Object[]) tmp;
            String s = (String) o[0];

            /*
            if (s.matches("(?i).*" + searchFor + ".*")) {
               found.add(new Object[]{
                      ((Object[]) tmp)[0], searchFor, ((Object[]) tmp)[2]
                  });
            }
         }

         */

            if (s.startsWith((String) searchFor))
               found.add(new Object[] {((Object[]) tmp) [0],  searchFor, ((Object[]) tmp) [2]});}

         this.removeAllItems();
         this.getModel().addElement(new Object[]{searchFor, searchFor, 0});
         for (int i = 0; i < found.size(); i++) {
            this.getModel().addElement(found.get(i));
         }
         this.setPopupVisible(true);
         // http://stackoverflow.com/questions/7605995
         BasicComboPopup popup =
            (BasicComboPopup) this.getAccessibleContext().getAccessibleChild(0);
         Window popupWindow = SwingUtilities.windowForComponent(popup);
         Window comboWindow = SwingUtilities.windowForComponent(this);

         if (comboWindow.equals(popupWindow)) {
            Component c = popup.getParent();
            Dimension d = c.getPreferredSize();
            c.setPreferredSize(d);

         } 
         else {
            popupWindow.pack();
         }
      }

      class searchRenderer extends BasicComboBoxRenderer {

         @Override
         public Component getListCellRendererComponent(JList list,
             Object value, int index, boolean isSelected, boolean cellHasFocus) {
            if (index == 0) {
               setText("");
               return this;
            }
            Object[] v = (Object[]) value;
            String s = (String) v[0];
            String lowerS = s.toLowerCase();
            String sf = (String) v[1];
            String lowerSf = sf.toLowerCase();
            List<String> notMatching = new ArrayList<String>();

            if (!sf.equals("")) {
               int fs = -1;
               int lastFs = 0;
               while ((fs = lowerS.indexOf(lowerSf, (lastFs == 0) ? -1 : lastFs)) > -1) {
                  notMatching.add(s.substring(lastFs, fs));
                  lastFs = fs + sf.length();
               }
               notMatching.add(s.substring(lastFs));
            }
            String html = "";
            if (notMatching.size() > 1) {
               html = notMatching.get(0);
               int start = html.length();
               int sfl = sf.length();
               for (int i = 1; i < notMatching.size(); i++) {
                  String t = notMatching.get(i);
                  html += "<b style=\"color: black;\">"
                     + s.substring(start, start + sfl) + "</b>" + t;
                  start += sfl + t.length();
               }
            }
            this.setText("<html><head></head><body style=\"color: gray;\">"
               + html + "</body></head>");
            return this;
         }
      }

      class searchComboBoxEditor extends BasicComboBoxEditor {

         public searchComboBoxEditor() {
            super();
         }

         @Override
         public void setItem(Object anObject) {
            if (anObject == null) {
               super.setItem(anObject);
            } 


            else {
               Object[] o = (Object[]) anObject;
               super.setItem(o[0]);
            }


         }

         @Override
         public Object getItem() {
            return new Object[]{super.getItem(), super.getItem(), 0};
         }
      }
   }

   public JTextField getComboBoxTextField()
   {

      final JTextField jtf = (JTextField) comboBox.getEditor().getEditorComponent();

      return jtf;

   }

    public static void main(String[] args)
   {

     FileChooserWithDelete fcwd = new FileChooserWithDelete();

   fcwd.showOpenDialog(null);


}  
}

Java 编程论坛页面的链接是 here .

Answer 1

您也许能够调整所检查的方法here 。对于通知，您可以利用现有的 JFileChooser 事件，如 here 所示。 。或者，您可以定义自己的 PropertyChangeEvent，如 here 所示。 .