我有一个 DefaultMutableTreeNodes 的 JTree,我想过滤它们。
当我进行过滤时,我想保留任何符合我的条件或有符合我的条件的子节点的节点。
在这里,我包含了代码供您参考。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Enumeration;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.border.EmptyBorder;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
import javax.swing.tree.TreeModel;
public class FilteredJTreeExample extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel contentPane;
private JTextField textField;
private JTree tree;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
FilteredJTreeExample frame = new FilteredJTreeExample();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the frame.
*/
public FilteredJTreeExample() {
//setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new BorderLayout(0, 0));
setContentPane(contentPane);
JPanel panel = new JPanel();
contentPane.add(panel, BorderLayout.NORTH);
GridBagLayout gbl_panel = new GridBagLayout();
gbl_panel.columnWidths = new int[]{34, 116, 0};
gbl_panel.rowHeights = new int[]{22, 0};
gbl_panel.columnWeights = new double[]{0.0, 1.0, Double.MIN_VALUE};
gbl_panel.rowWeights = new double[]{0.0, Double.MIN_VALUE};
panel.setLayout(gbl_panel);
JLabel lblFilter = new JLabel("Search:");
GridBagConstraints gbc_lblFilter = new GridBagConstraints();
gbc_lblFilter.anchor = GridBagConstraints.WEST;
gbc_lblFilter.insets = new Insets(0, 0, 0, 5);
gbc_lblFilter.gridx = 0;
gbc_lblFilter.gridy = 0;
panel.add(lblFilter, gbc_lblFilter);
JScrollPane scrollPane = new JScrollPane();
contentPane.add(scrollPane, BorderLayout.CENTER);
tree = new JTree();
tree.setEditable( true );
tree.setShowsRootHandles( false );
tree.setInvokesStopCellEditing(true);
scrollPane.setViewportView(tree);
textField = new JTextField();
GridBagConstraints gbc_textField = new GridBagConstraints();
gbc_textField.fill = GridBagConstraints.HORIZONTAL;
gbc_textField.anchor = GridBagConstraints.NORTH;
gbc_textField.gridx = 1;
gbc_textField.gridy = 0;
panel.add(textField, gbc_textField);
textField.setColumns(10);
textField.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
TreeModel model = tree.getModel();
tree.setModel(null);
tree.setModel(model);
}
});
tree.setCellRenderer(new DefaultTreeCellRenderer() {
private JLabel lblNull = new JLabel();
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean arg2, boolean arg3, boolean arg4, int arg5, boolean arg6) {
Component c = super.getTreeCellRendererComponent(tree, value, arg2, arg3, arg4, arg5, arg6);
DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
if (matchesFilter(node)) {
c.setForeground(Color.BLACK);
return c;
}
else if (containsMatchingChild(node)) {
c.setForeground(Color.GRAY);
return c;
}
else {
return lblNull;
}
}
private boolean matchesFilter(DefaultMutableTreeNode node) {
return node.toString().contains(textField.getText());
}
private boolean containsMatchingChild(DefaultMutableTreeNode node) {
Enumeration<DefaultMutableTreeNode> e = node.breadthFirstEnumeration();
boolean isMatched = false;
while (e.hasMoreElements()) {
DefaultMutableTreeNode nextElement = e.nextElement();
if (matchesFilter(nextElement)) {
isMatched = true;
}
}
return isMatched;
}
});
}
}
输出:
当我将搜索文本输入为“颜色”并单击 Enter 时。它仅显示 JTree 和 Colors 节点。
问题:
我想展示颜色的孩子。即蓝色、紫色等,
我发现的另一个问题是在执行搜索操作后,鼠标向上滚动不起作用而向下滚动工作正常。它可以通过搜索“e”并缩小框架并向下和向上滚动鼠标来复制。
注意:我使用的是 Ubuntu 14.04 LTS。
有任何想法吗?