Source Code : MultiLine Tree Example

Java Is Open Source Programming Language You Can Download From Java and Java Libraries From http://www.oracle.com. Click Here to download
We provide this code related to title for you to solve your developing problem easily. Libraries which is import in this program you can download from http://www.oracle.com. Click Here or search from google with Libraries Name you get jar file related it

MultiLine Tree Example

// Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html

/* (swing1.1beta3) */


import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.plaf.ColorUIResource;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeCellRenderer;


/**
 * @version 1.0 11/09/98
 */
public class MultiLineTreeExample extends JFrame {
  public MultiLineTreeExample() {
    super("Multi-Line JTree Example");

    String[] strs = { "swing", // 0
        "package", // 1
        "java.awt.swing
" + "com.sun.java.swing", // 2
        "javax.swing", // 3
        "JTree" }; // 4

    DefaultMutableTreeNode[] nodes = new DefaultMutableTreeNode[strs.length];
    for (int i = 0; i < strs.length; i++) {
      nodes[i] = new DefaultMutableTreeNode(strs[i]);
    }
    nodes[0].add(nodes[1]);
    nodes[1].add(nodes[2]);
    nodes[1].add(nodes[3]);
    nodes[0].add(nodes[4]);

    JTree tree = new JTree(nodes[0]);
    tree.setCellRenderer(new MultiLineCellRenderer());
    JScrollPane sp = new JScrollPane();
    sp.getViewport().add(tree);
    getContentPane().add(sp, BorderLayout.CENTER);
  }

  public static void main(String args[]) {
    try {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
    } catch (Exception evt) {}

    MultiLineTreeExample frame = new MultiLineTreeExample();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    frame.setSize(300, 150);
    frame.setVisible(true);
  }
}

class MultiLineCellRenderer extends JPanel implements TreeCellRenderer {
  protected JLabel icon;

  protected TreeTextArea text;

  public MultiLineCellRenderer() {
    setLayout(new BoxLayout(this, BoxLayout.X_AXIS));
    icon = new JLabel() {
      public void setBackground(Color color) {
        if (color instanceof ColorUIResource)
          color = null;
        super.setBackground(color);
      }
    };
    add(icon);
    add(Box.createHorizontalStrut(4));
    add(text = new TreeTextArea());
  }

  public Component getTreeCellRendererComponent(JTree tree, Object value,
      boolean isSelected, boolean expanded, boolean leaf, int row,
      boolean hasFocus) {
    String stringValue = tree.convertValueToText(value, isSelected,
        expanded, leaf, row, hasFocus);
    setEnabled(tree.isEnabled());
    text.setText(stringValue);
    text.setSelect(isSelected);
    text.setFocus(hasFocus);
    if (leaf) {
      icon.setIcon(UIManager.getIcon("Tree.leafIcon"));
    } else if (expanded) {
      icon.setIcon(UIManager.getIcon("Tree.openIcon"));
    } else {
      icon.setIcon(UIManager.getIcon("Tree.closedIcon"));
    }
    return this;
  }

  public Dimension getPreferredSize() {
    Dimension iconD = icon.getPreferredSize();
    Dimension textD = text.getPreferredSize();
    int height = iconD.height < textD.height ? textD.height : iconD.height;
    return new Dimension(iconD.width + textD.width, height);
  }

  public void setBackground(Color color) {
    if (color instanceof ColorUIResource)
      color = null;
    super.setBackground(color);
  }

  class TreeTextArea extends JTextArea {
    Dimension preferredSize;

    TreeTextArea() {
      setLineWrap(true);
      setWrapStyleWord(true);
      setOpaque(true);
    }

    public void setBackground(Color color) {
      if (color instanceof ColorUIResource)
        color = null;
      super.setBackground(color);
    }

    public void setPreferredSize(Dimension d) {
      if (d != null) {
        preferredSize = d;
      }
    }

    public Dimension getPreferredSize() {
      return preferredSize;
    }

    public void setText(String str) {
      FontMetrics fm = getToolkit().getFontMetrics(getFont());
      BufferedReader br = new BufferedReader(new StringReader(str));
      String line;
      int maxWidth = 0, lines = 0;
      try {
        while ((line = br.readLine()) != null) {
          int width = SwingUtilities.computeStringWidth(fm, line);
          if (maxWidth < width) {
            maxWidth = width;
          }
          lines++;
        }
      } catch (IOException ex) {
        ex.printStackTrace();
      }
      lines = (lines < 1) ? 1 : lines;
      int height = fm.getHeight() * lines;
      setPreferredSize(new Dimension(maxWidth + 6, height));
      super.setText(str);
    }

    void setSelect(boolean isSelected) {
      Color bColor;
      if (isSelected) {
        bColor = UIManager.getColor("Tree.selectionBackground");
      } else {
        bColor = UIManager.getColor("Tree.textBackground");
      }
      super.setBackground(bColor);
    }

    void setFocus(boolean hasFocus) {
      if (hasFocus) {
        Color lineColor = UIManager
            .getColor("Tree.selectionBorderColor");
        setBorder(BorderFactory.createLineBorder(lineColor));
      } else {
        setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
      }
    }
  }
}

           
       

Thank with us