2016-07-14 77 views
2

我有一個DefaultMutableTreeNodes的JTree,我想過濾它們。過濾器jtree - 保持與標準匹配的節點的所有節點和子節點

當我做一個過濾器時,我想保留任何符合我的標準或有符合我的標準的孩子的節點。

這裏我包含了供您參考的代碼。

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; 
      } 
     }); 
    } 
} 

輸出:

enter image description here

當我輸入搜索文本 「色」,並點擊進入。它只顯示JTree和顏色節點。

問題:

  1. 我要顯示的顏色的兒童。即藍,紫等,

  2. 我發現的另一個問題是執行搜索操作後,鼠標向上滾動不工作,而向下滾動工作正常。它可以通過搜索「e」並縮小框架並使鼠標向下滾動來進行復制。

注意:我使用Ubuntu 14.04 LTS。

任何想法?

+0

關於1.,你可以做'int r = 0; while(r Marco13

+0

@ Marco13:我已經有一個展開全部動作,這裏沒有顯示。我的問題是,我無法匹配符合標準的父母的孩子。在這裏,我想顯示JTree>顏色>藍紫色紅色黃色。 – Tamil

+0

@ Marco13:回答問題2:輸入「e」(做一個輸入按鈕)並將框架縮小爲僅顯示3條記錄,並向下滾動,您可以看到另外3條記錄。但是你向上滾動,以前的記錄沒有顯示。這將發生在鼠標滾動上(左鍵單擊按鈕旁邊)。如果我們拖動右側的滾動條,它的工作正常。 – Tamil

回答

2

您還需要一種方法,其中包含一個節點,其中一個父母(祖先)包含所需的字符串。例如,

private boolean containsMatchingParent(DefaultMutableTreeNode node) 
{ 
    DefaultMutableTreeNode current = node; 
    while (current != null) 
    { 
     if (matchesFilter(current)) 
     { 
      return true; 
     } 
     current = (DefaultMutableTreeNode) current.getParent(); 
    } 
    return false; 
} 

(以與containsMatchingChild相同的方式使用)。

2

更改matchesFilter()到:

private boolean matchesFilter(DefaultMutableTreeNode node) 
{ 
    TreeNode parent = node; 
    while (parent != null) 
    { 
     if (parent.toString().contains(textField.getText())) 
     { 
      return true; 
     } 
     parent = parent.getParent(); 

    } 

    return false; 
} 

,將返回的顏色,所以你將能夠擴大colors節點。