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Check List Example

Check List Example
 
// Example from http://www.crionics.com/products/opensource/faq/swing_ex/SwingExamples.html
//File:CheckListExample.java
/* (swing1.1.1beta2) */


import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Enumeration;

import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTree;
import javax.swing.ListCellRenderer;
import javax.swing.ListModel;
import javax.swing.ListSelectionModel;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
import javax.swing.plaf.ColorUIResource;
import javax.swing.plaf.metal.MetalIconFactory;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeCellRenderer;

/**
 * @version 1.0 04/24/99
 */
public class CheckListExample extends JFrame {

  public CheckListExample() {
    super("CheckList Example");
    String[] strs = { "swing", "home", "basic", "metal", "JList" };

    final JList list = new JList(createData(strs));

    // set "home" icon
    Icon icon = MetalIconFactory.getFileChooserHomeFolderIcon();
    ((CheckableItem) list.getModel().getElementAt(1)).setIcon(icon);

    list.setCellRenderer(new CheckListRenderer());
    list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    list.setBorder(new EmptyBorder(0, 4, 0, 0));
    list.addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        int index = list.locationToIndex(e.getPoint());
        CheckableItem item = (CheckableItem) list.getModel()
            .getElementAt(index);
        item.setSelected(!item.isSelected());
        Rectangle rect = list.getCellBounds(index, index);
        list.repaint(rect);
      }
    });
    JScrollPane sp = new JScrollPane(list);

    final JTextArea textArea = new JTextArea(3, 10);
    JScrollPane textPanel = new JScrollPane(textArea);
    JButton printButton = new JButton("print");
    printButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        ListModel model = list.getModel();
        int n = model.getSize();
        for (int i = 0; i < n; i++) {
          CheckableItem item = (CheckableItem) model.getElementAt(i);
          if (item.isSelected()) {
            textArea.append(item.toString());
            textArea.append(System.getProperty("line.separator"));
          }
        }
      }
    });
    JButton clearButton = new JButton("clear");
    clearButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textArea.setText("");
      }
    });
    JPanel panel = new JPanel(new GridLayout(2, 1));
    panel.add(printButton);
    panel.add(clearButton);

    getContentPane().add(sp, BorderLayout.CENTER);
    getContentPane().add(panel, BorderLayout.EAST);
    getContentPane().add(textPanel, BorderLayout.SOUTH);
  }

  private CheckableItem[] createData(String[] strs) {
    int n = strs.length;
    CheckableItem[] items = new CheckableItem[n];
    for (int i = 0; i < n; i++) {
      items[i] = new CheckableItem(strs[i]);
    }
    return items;
  }

  class CheckableItem {
    private String str;

    private boolean isSelected;

    private Icon icon;

    public CheckableItem(String str) {
      this.str = str;
      isSelected = false;
    }

    public void setSelected(boolean b) {
      isSelected = b;
    }

    public boolean isSelected() {
      return isSelected;
    }

    public String toString() {
      return str;
    }

    public void setIcon(Icon icon) {
      this.icon = icon;
    }

    public Icon getIcon() {
      return icon;
    }
  }

  class CheckListRenderer extends CheckRenderer implements ListCellRenderer {
    Icon commonIcon;

    public CheckListRenderer() {
      check.setBackground(UIManager.getColor("List.textBackground"));
      label.setForeground(UIManager.getColor("List.textForeground"));
      commonIcon = UIManager.getIcon("Tree.leafIcon");
    }

    public Component getListCellRendererComponent(JList list, Object value,
        int index, boolean isSelected, boolean hasFocus) {
      setEnabled(list.isEnabled());
      check.setSelected(((CheckableItem) value).isSelected());
      label.setFont(list.getFont());
      label.setText(value.toString());
      label.setSelected(isSelected);
      label.setFocus(hasFocus);
      Icon icon = ((CheckableItem) value).getIcon();
      if (icon == null) {
        icon = commonIcon;
      }
      label.setIcon(icon);
      return this;
    }
  }

  public static void main(String args[]) {
    try {
        UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
    } catch (Exception evt) {}
  
    CheckListExample frame = new CheckListExample();
    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

class CheckRenderer extends JPanel implements TreeCellRenderer {
  protected JCheckBox check;

  protected TreeLabel label;

  public CheckRenderer() {
    setLayout(null);
    add(check = new JCheckBox());
    add(label = new TreeLabel());
    check.setBackground(UIManager.getColor("Tree.textBackground"));
    label.setForeground(UIManager.getColor("Tree.textForeground"));
  }

  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());
    check.setSelected(((CheckNode) value).isSelected());
    label.setFont(tree.getFont());
    label.setText(stringValue);
    label.setSelected(isSelected);
    label.setFocus(hasFocus);
    if (leaf) {
      label.setIcon(UIManager.getIcon("Tree.leafIcon"));
    } else if (expanded) {
      label.setIcon(UIManager.getIcon("Tree.openIcon"));
    } else {
      label.setIcon(UIManager.getIcon("Tree.closedIcon"));
    }
    return this;
  }

  public Dimension getPreferredSize() {
    Dimension d_check = check.getPreferredSize();
    Dimension d_label = label.getPreferredSize();
    return new Dimension(d_check.width + d_label.width,
        (d_check.height < d_label.height ? d_label.height
            : d_check.height));
  }

  public void doLayout() {
    Dimension d_check = check.getPreferredSize();
    Dimension d_label = label.getPreferredSize();
    int y_check = 0;
    int y_label = 0;
    if (d_check.height < d_label.height) {
      y_check = (d_label.height - d_check.height) / 2;
    } else {
      y_label = (d_check.height - d_label.height) / 2;
    }
    check.setLocation(0, y_check);
    check.setBounds(0, y_check, d_check.width, d_check.height);
    label.setLocation(d_check.width, y_label);
    label.setBounds(d_check.width, y_label, d_label.width, d_label.height);
  }

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

  public class TreeLabel extends JLabel {
    boolean isSelected;

    boolean hasFocus;

    public TreeLabel() {
    }

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

    public void paint(Graphics g) {
      String str;
      if ((str = getText()) != null) {
        if (0 < str.length()) {
          if (isSelected) {
            g.setColor(UIManager
                .getColor("Tree.selectionBackground"));
          } else {
            g.setColor(UIManager.getColor("Tree.textBackground"));
          }
          Dimension d = getPreferredSize();
          int imageOffset = 0;
          Icon currentI = getIcon();
          if (currentI != null) {
            imageOffset = currentI.getIconWidth()
                + Math.max(0, getIconTextGap() - 1);
          }
          g.fillRect(imageOffset, 0, d.width - 1 - imageOffset,
              d.height);
          if (hasFocus) {
            g.setColor(UIManager
                .getColor("Tree.selectionBorderColor"));
            g.drawRect(imageOffset, 0, d.width - 1 - imageOffset,
                d.height - 1);
          }
        }
      }
      super.paint(g);
    }

    public Dimension getPreferredSize() {
      Dimension retDimension = super.getPreferredSize();
      if (retDimension != null) {
        retDimension = new Dimension(retDimension.width + 3,
            retDimension.height);
      }
      return retDimension;
    }

    public void setSelected(boolean isSelected) {
      this.isSelected = isSelected;
    }

    public void setFocus(boolean hasFocus) {
      this.hasFocus = hasFocus;
    }
  }
}

class CheckNode extends DefaultMutableTreeNode {

  public final static int SINGLE_SELECTION = 0;

  public final static int DIG_IN_SELECTION = 4;

  protected int selectionMode;

  protected boolean isSelected;

  public CheckNode() {
    this(null);
  }

  public CheckNode(Object userObject) {
    this(userObject, true, false);
  }

  public CheckNode(Object userObject, boolean allowsChildren,
      boolean isSelected) {
    super(userObject, allowsChildren);
    this.isSelected = isSelected;
    setSelectionMode(DIG_IN_SELECTION);
  }

  public void setSelectionMode(int mode) {
    selectionMode = mode;
  }

  public int getSelectionMode() {
    return selectionMode;
  }

  public void setSelected(boolean isSelected) {
    this.isSelected = isSelected;

    if ((selectionMode == DIG_IN_SELECTION) && (children != null)) {
      Enumeration e = children.elements();
      while (e.hasMoreElements()) {
        CheckNode node = (CheckNode) e.nextElement();
        node.setSelected(isSelected);
      }
    }
  }

  public boolean isSelected() {
    return isSelected;
  }

  // If you want to change "isSelected" by CellEditor,
  /*
   * public void setUserObject(Object obj) { if (obj instanceof Boolean) {
   * setSelected(((Boolean)obj).booleanValue()); } else {
   * super.setUserObject(obj); } }
   */

}


           
         
  










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