JTree中怎么使每个叶节点的图标不一样

[fengsheng168]

JTree中怎么使每个叶节点的图标不一样,像qq中那样每个人有不同的头像？？？请给个参考代码谢谢

[chengyongyuan1111]

实现TreeCellRender类应该就可以了。给你几个程序你参考一下。应该可以做出来，加油

// TestTree3.java
// A simple test to see how we can build a tree and customize its icons
//
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.tree.*;

public class TestTree3 extends JFrame {

  JTree tree;
  DefaultTreeModel treeModel;

  public TestTree3( ) {
    super("Tree Test Example");
    setSize(200, 150);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    // Add our own customized tree icons.
    UIManager.put("Tree.leafIcon", new ImageIcon("world.gif"));
    UIManager.put("Tree.openIcon", new ImageIcon("door.open.gif"));
    UIManager.put("Tree.closedIcon", new ImageIcon("door.closed.gif"));
    UIManager.put("Tree.expandedIcon", new ImageIcon("unlocked.gif"));
    UIManager.put("Tree.collapsedIcon", new ImageIcon("locked.gif"));
  }

  public void init( ) {
    // Build the hierarchy of containers and objects.
    String[] schoolyard = {"School", "Playground", "Parking Lot", "Field"};
    String[] mainstreet = {"Grocery", "Shoe Shop", "Five & Dime", "Post Office"};
    String[] highway = {"Gas Station", "Convenience Store"};
    String[] housing = {"Victorian_blue", "Faux Colonial", "Victorian_white"};
    String[] housing2 = {"Mission", "Ranch", "Condo"};
    Hashtable homeHash = new Hashtable( );
    homeHash.put("Residential 1", housing);
    homeHash.put("Residential 2", housing2);

    Hashtable cityHash = new Hashtable( );
    cityHash.put("School grounds", schoolyard);
    cityHash.put("Downtown", mainstreet);
    cityHash.put("Highway", highway);
    cityHash.put("Housing", homeHash);

    Hashtable worldHash = new Hashtable( );
    worldHash.put("My First VRML World", cityHash);
    
    // Build our tree out of our big hashtable.
    tree = new JTree(worldHash);

    // Pick an angled line style.
    tree.putClientProperty("JTree.lineStyle", "Angled");
    getContentPane( ).add(tree, BorderLayout.CENTER);
  }

  public static void main(String args[]) {
    TestTree3 tt = new TestTree3( );
    tt.init( );
    tt.setVisible(true);
  }

}

// IconAndTipRenderer.java
// A renderer for our XML cells
//
import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;

public class IconAndTipRenderer extends JLabel implements TreeCellRenderer {

  Color backColor = new Color(0xFF, 0xCC, 0xFF);
  Icon openIcon, closedIcon, leafIcon;
  String tipText = "";

  public IconAndTipRenderer(Icon open, Icon closed, Icon leaf) {
    openIcon = open;
    closedIcon = closed;
    leafIcon = leaf;
    setBackground(backColor);
    setForeground(Color.black);
  }

  public Component getTreeCellRendererComponent(JTree tree, Object value,
                                                boolean selected,
                                                boolean expanded, boolean leaf,
                                                int row, boolean hasFocus) {
    setText(value.toString( ));
    if (selected) {
      setOpaque(true);
    }
    else {
      setOpaque(false);
    }

    // Try to find an IconAndTipCarrier version of the current node.
    IconAndTipCarrier itc = null;
    if (value instanceof DefaultMutableTreeNode) {
      Object uo = ((DefaultMutableTreeNode)value).getUserObject( );
      if (uo instanceof IconAndTipCarrier) {
        itc = (IconAndTipCarrier)uo;
      }
    }
    else if (value instanceof IconAndTipCarrier) {
      itc = (IconAndTipCarrier)value;
    }
    if ((itc != null) && (itc.getIcon( ) != null)) {
      // Great! Use itc's values to customize this label.
      setIcon(itc.getIcon( ));
      tipText = itc.getToolTipText( );
    }
    else {
      // Hmmm, nothing available, so rely on the defaults.
      tipText = " ";
      if (expanded) {
        setIcon(openIcon);
      }
      else if (leaf) {
        setIcon(leafIcon);
      }
      else {
        setIcon(closedIcon);
      }
    }
    return this;
  }

  // Override the default to send back different strings for folders and leaves.
  public String getToolTipText( ) {
    return tipText;
  }
}

希望楼主给我加分哦。我还没有得过分呢，鼓励一下嘛，呵呵

[jackkui]

TreeCellRenderer 就是用来描述树节点的外观的，你只要把TreeCellRenderer自己定制一下应该将就可以，如何定制，可以参考2楼的朋友的代码。

[hahe7788]

import java.awt.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.tree.*;

public class TestTree3 extends JFrame {

JTree tree;
DefaultTreeModel treeModel;

public TestTree3( ) {
super("Tree Test Example");
setSize(200, 150);
setDefaultCloseOperation(EXIT_ON_CLOSE);

// Add our own customized tree icons.
UIManager.put("Tree.leafIcon", new ImageIcon("world.gif"));
UIManager.put("Tree.openIcon", new ImageIcon("door.open.gif"));
UIManager.put("Tree.closedIcon", new ImageIcon("door.closed.gif"));
UIManager.put("Tree.expandedIcon", new ImageIcon("unlocked.gif"));
UIManager.put("Tree.collapsedIcon", new ImageIcon("locked.gif"));
}

public void init( ) {
// Build the hierarchy of containers and objects.
String[] schoolyard = {"School", "Playground", "Parking Lot", "Field"};
String[] mainstreet = {"Grocery", "Shoe Shop", "Five & Dime", "Post Office"};
String[] highway = {"Gas Station", "Convenience Store"};
String[] housing = {"Victorian_blue", "Faux Colonial", "Victorian_white"};
String[] housing2 = {"Mission", "Ranch", "Condo"};
Hashtable homeHash = new Hashtable( );
homeHash.put("Residential 1", housing);
homeHash.put("Residential 2", housing2);

Hashtable cityHash = new Hashtable( );
cityHash.put("School grounds", schoolyard);
cityHash.put("Downtown", mainstreet);
cityHash.put("Highway", highway);
cityHash.put("Housing", homeHash);

Hashtable worldHash = new Hashtable( );
worldHash.put("My First VRML World", cityHash);

// Build our tree out of our big hashtable.
tree = new JTree(worldHash);

// Pick an angled line style.
tree.putClientProperty("JTree.lineStyle", "Angled");
getContentPane( ).add(tree, BorderLayout.CENTER);
}

public static void main(String args[]) {
TestTree3 tt = new TestTree3( );
tt.init( );
tt.setVisible(true);
}

}

[hahe7788]

import java.awt.*;
import javax.swing.*;
import javax.swing.tree.*;

public class IconAndTipRenderer extends JLabel implements TreeCellRenderer {

Color backColor = new Color(0xFF, 0xCC, 0xFF);
Icon openIcon, closedIcon, leafIcon;
String tipText = "";

public IconAndTipRenderer(Icon open, Icon closed, Icon leaf) {
openIcon = open;
closedIcon = closed;
leafIcon = leaf;
setBackground(backColor);
setForeground(Color.black);
}

public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean selected,
boolean expanded, boolean leaf,
int row, boolean hasFocus) {
setText(value.toString( ));
if (selected) {
setOpaque(true);
}
else {
setOpaque(false);
}

// Try to find an IconAndTipCarrier version of the current node.
IconAndTipCarrier itc = null;
if (value instanceof DefaultMutableTreeNode) {
Object uo = ((DefaultMutableTreeNode)value).getUserObject( );
if (uo instanceof IconAndTipCarrier) {
itc = (IconAndTipCarrier)uo;
}
}
else if (value instanceof IconAndTipCarrier) {
itc = (IconAndTipCarrier)value;
}
if ((itc != null) && (itc.getIcon( ) != null)) {
// Great! Use itc's values to customize this label.
setIcon(itc.getIcon( ));
tipText = itc.getToolTipText( );
}
else {
// Hmmm, nothing available, so rely on the defaults.
tipText = " ";
if (expanded) {
setIcon(openIcon);
}
else if (leaf) {
setIcon(leafIcon);
}
else {
setIcon(closedIcon);
}
}
return this;
}

// Override the default to send back different strings for folders and leaves.
public String getToolTipText( ) {
return tipText;
}
}

[hahe7788]

LZ要的是不是这样............自己看看能否可以用

[fengsheng168]

看的不是很明白，能不能给个简单的代码，或者注释详细一点，不好意思，刚学，谢谢

[fengsheng168]

这两天有事没上，谢谢各位的帮助，我想要的是可以象qq一样更改图标，应该怎么做那？？？比如说男的是个q哥哥头像，女的就是个q妹妹头像，应该怎么实现？每次都定制treeCellRenderer？？

[xuzhenqinandy]

你可以继承这个DefaultTreeCellRenderer类

public class SmsTreeRenderer extends DefaultTreeCellRenderer
{
//这些你要男或女的图片对象
Icon localIcon;

Icon inBoxIcon;

public SmsTreeRenderer(Icon localIcon, Icon inBoxIcon)
{
this.localIcon = localIcon;
this.inBoxIcon = inBoxIcon;
}

public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded,
boolean leaf, int row, boolean hasFocus)
{

super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
if (这里判断是否为男)
{
//加男图片
setIcon(localIcon);
} else {
//加女图片
setIcon(inBoxIcon);
}

return this;
}

}


具体使用：
创建树对象，设置树对象方法smsTree.setCellRenderer(new SmsTreeRenderer(new ImageIcon("男图片"), new ImageIcon("女图片"));

[hanfengthinker]

顶楼上的

[fengsheng168]

谢谢各位了，散过分了。。。。。