禁用JFileChooser中的打开按钮？

Question

public class MyFileChooser extends JFileChooser {

  private final JFrame mainFrame;

  public MyFileChooser(JFrame mainFrame) {
    this.mainFrame = mainFrame;
    setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
  }

  @Override
  public void approveSelection() {
    if (/* directory is valid */) {
      super.approveSelection();
      return;
    }
    JOptionPane.showMessageDialog(mainFrame, "Invalid directory", "Error", JOptionPane.ERROR_MESSAGE);
  }

}

Answer 1

当检测到文件/目录上的任何选择更改时，可以通过调用chooser.setControlButtonsareShow（false）来隐藏接受/取消按钮：

myChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
myChooser.addPropertyChangeListener(new PropertyChangeListener() {
  public void propertyChange(PropertyChangeEvent evt) {
        if (JFileChooser.SELECTED_FILE_CHANGED_PROPERTY.equals(evt.getPropertyName())) {
            File file = (File) evt.getNewValue();
            if (file != null && file.isFile()) {    // your condition                  
                myChooser.setControlButtonsAreShown(false);
            }
            else if ( file != null ) {
                System.out.println(file.getName());
                myChooser.setControlButtonsAreShown(true);
            }
        }

        myChooser.repaint();
    }
});

但这可能会让用户感到困惑，最好是自定义FileFilter，只显示您需要的文件/目录：

public static class MyDirectoryFilter extends javax.swing.filechooser.FileFilter {
  @Override
  public boolean accept( File file ) {
    return file.isDirectory() && customeCondition(file) ;
  }

  @Override
  public String getDescription() {
    return "this only my custom dir";
  }
}

myChooser.setFileFilter( new MyDirectoryFilter () );

编辑：我找到了禁用按钮的方法，通过迭代组件并获得打开按钮的句柄:http://www.coderanch.com/t/468663/gui/java/disabiling-enable-level-button-folder

myChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
myChooser.addPropertyChangeListener(new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent evt) {
    if (JFileChooser.SELECTED_FILE_CHANGED_PROPERTY.equals(evt.getPropertyName())) {
           File file = (File) evt.getNewValue();

           if (file != null && file.isFile()) { 
                setOpenButtonState(myChooser, false);

           }
           else if ( file != null ) {
                setOpenButtonState(myChooser, true);
                System.out.println(file.getName());
           }
        }

        myChooser.repaint();
    }
});

public static void setOpenButtonState(Container c, boolean flag) {
    int len = c.getComponentCount();
    for (int i = 0; i < len; i++) {
      Component comp = c.getComponent(i);

      if (comp instanceof JButton) {
        JButton b = (JButton) comp;

        if ( "Open".equals(b.getText()) ) {
            b.setEnabled(flag);
        }

      } else if (comp instanceof Container) {
          setOpenButtonState((Container) comp, flag);
      }
    }     
}