登录站点

用户名

密码

OpenSwing--JComboBox 下拉树(JTreeComboBox)

1已有 3755 次阅读  2010-07-29 00:15   标签OpenSwing 

 

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.plaf.*;

import javax.swing.plaf.basic.*;

import javax.swing.plaf.metal.*;

import javax.swing.tree.*;

 

import com.sun.java.swing.plaf.motif.*;

import com.sun.java.swing.plaf.windows.*;

 

/**

 * <p>Title: OpenSwing</p>

 * <p>Description: 树形下拉列表框</p>

 * <p>Copyright: Copyright (c) 2004</p>

 * <p>Company: </p>

 * @author  <a href="mailto:rockis@msn.com">zhanglei</a>

 *  && <a href="mailto:sunkingxie@hotmail.com">SunKing</a>

 * @version 1.0

 */

public class JTreeComboBox extends JComboBox{

    /**

     * 显示用的树

     */

    private JTree tree;

 

    public JTreeComboBox(){

        this(new JTree());

    }

 

    public JTreeComboBox(JTree tree){

        this.setTree(tree);

    }

 

    /**

     * 设置树

     * @param tree JTree

     */

    public void setTree(JTree tree){

        this.tree = tree;

        if(tree != null){

            this.setSelectedItem(tree.getSelectionPath());

            this.setRenderer(new JTreeComboBoxRenderer());

        }

        this.updateUI();

    }

 

    /**

     * 取得树

     * @return JTree

     */

    public JTree getTree(){

        return tree;

    }

 

    /**

     * 设置当前选择的树路径

     * @param o Object

     */

    public void setSelectedItem(Object o){

        tree.setSelectionPath((TreePath)o);

        getModel().setSelectedItem(o);

    }

 

    public void updateUI(){

        ComboBoxUI cui = (ComboBoxUI)UIManager.getUI(this);

        if(cui instanceof MetalComboBoxUI){

            cui = new MetalJTreeComboBoxUI();

        } else if(cui instanceof MotifComboBoxUI){

            cui = new MotifJTreeComboBoxUI();

        } else {

            cui = new WindowsJTreeComboBoxUI();

        }

        setUI(cui);

    }

 

    // UI Inner classes -- one for each supported Look and Feel

    class MetalJTreeComboBoxUI extends MetalComboBoxUI{

        protected ComboPopup createPopup(){

            return new TreePopup(comboBox);

        }

    }

 

    class WindowsJTreeComboBoxUI extends WindowsComboBoxUI{

        protected ComboPopup createPopup(){

            return new TreePopup(comboBox);

        }

    }

 

    class MotifJTreeComboBoxUI extends MotifComboBoxUI{

        protected ComboPopup createPopup(){

            return new TreePopup(comboBox);

        }

    }

    /**

     * <p>Title: OpenSwing</p>

     * <p>Description: 树形结构而来的DefaultListCellRenderer </p>

     * <p>Copyright: Copyright (c) 2004</p>

     * <p>Company: </p>

     * @author <a href="mailto:sunkingxie@hotmail.com">SunKing</a>

     * @version 1.0

     */

    class JTreeComboBoxRenderer extends DefaultListCellRenderer{

        public Component getListCellRendererComponent(JList list, Object value,

            int index, boolean isSelected, boolean cellHasFocus){

            if(value != null){

                TreePath path = (TreePath)value;

                TreeNode node = (TreeNode)path.getLastPathComponent();

                value = node;

                TreeCellRenderer r = tree.getCellRenderer();

                JLabel lb = (JLabel)r.getTreeCellRendererComponent(

                    tree, value, isSelected, false, node.isLeaf(), index,

                    cellHasFocus);

                return lb;

            }

            return super.getListCellRendererComponent(list, value, index,

                isSelected, cellHasFocus);

        }

    }

 

    /**

     * 测试

     */

    public static void main(String args[]){

    JFrame frame = new JFrame("JTreeComboBox");

    final JTreeComboBox box = new JTreeComboBox(new JTree());

    box.setPreferredSize(new Dimension(300, 28));

    frame.getContentPane().add(box);

    frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    frame.pack();

    frame.setVisible(true);

    }

}

 

/**

 * <p>Title: JTreeComboBox</p>

 * <p>Description: TreePopup</p>

 * <p>Copyright: Copyright (c) 2004</p>

 * <p>Company: </p>

 * @author  <a href="mailto:rockis@msn.com">zhanglei</a>

 *  && <a href="mailto:sunkingxie@hotmail.com">SunKing</a>

 * @version 1.0

 */

class TreePopup extends JPopupMenu implements ComboPopup{

    protected JTreeComboBox comboBox;

    protected JScrollPane scrollPane;

 

    protected MouseMotionListener mouseMotionListener;

    protected MouseListener mouseListener;

    private MouseListener treeSelectListener = new MouseAdapter(){

        public void mouseReleased(MouseEvent e){

            JTree tree = (JTree)e.getSource();

            TreePath tp = tree.getPathForLocation(e.getPoint().x,

                                                  e.getPoint().y);

            if(tp == null){

                return;

            }

            comboBox.setSelectedItem(tp);

            togglePopup();

            MenuSelectionManager.defaultManager().clearSelectedPath();

        }

    };

 

    public TreePopup(JComboBox comboBox){

        this.comboBox = (JTreeComboBox)comboBox;

        setBorder(BorderFactory.createLineBorder(Color.black));

        setLayout(new BorderLayout());

        setLightWeightPopupEnabled(comboBox.isLightWeightPopupEnabled());

        JTree tree = this.comboBox.getTree();

        if(tree != null){

            scrollPane = new JScrollPane(tree);

            scrollPane.setBorder(null);

            add(scrollPane, BorderLayout.CENTER);

            tree.addMouseListener(treeSelectListener);

        }

    }

 

    public void show(){

        updatePopup();

        show(comboBox, 0, comboBox.getHeight());

        comboBox.getTree().requestFocus();

    }

 

    public void hide(){

        setVisible(false);

        comboBox.firePropertyChange("popupVisible", true, false);

    }

 

    protected JList list = new JList();

    public JList getList(){

        return list;

    }

 

    public MouseMotionListener getMouseMotionListener(){

        if(mouseMotionListener == null){

            mouseMotionListener = new MouseMotionAdapter(){};

        }

        return mouseMotionListener;

    }

 

    public KeyListener getKeyListener(){

        return null;

    }

 

    public void uninstallingUI(){}

 

    /**

     * Implementation of ComboPopup.getMouseListener().

     *

     * @return a <code>MouseListener</code> or null

     * @see ComboPopup#getMouseListener

     */

    public MouseListener getMouseListener(){

        if(mouseListener == null){

            mouseListener = new InvocationMouseHandler();

        }

        return mouseListener;

    }

 

    protected void togglePopup(){

        if(isVisible()){

            hide();

        } else{

            show();

        }

    }

    protected void updatePopup(){

        setPreferredSize(new Dimension(comboBox.getSize().width, 200));

        Object selectedObj = comboBox.getSelectedItem();

        if(selectedObj != null){

            TreePath tp = (TreePath)selectedObj;

            ((JTreeComboBox)comboBox).getTree().setSelectionPath(tp);

        }

    }

 

    protected class InvocationMouseHandler extends MouseAdapter{

        public void mousePressed(MouseEvent e){

            if(!SwingUtilities.isLeftMouseButton(e) || !comboBox.isEnabled()){

                return;

            }

            if(comboBox.isEditable()){

                Component comp = comboBox.getEditor().getEditorComponent();

                if((!(comp instanceof JComponent)) ||

                   ((JComponent)comp).isRequestFocusEnabled()){

                    comp.requestFocus();

                }

            } else if(comboBox.isRequestFocusEnabled()){

                comboBox.requestFocus();

            }

            togglePopup();

        }

    }

}

 

 

文章出处《OpenSwing》,版权归属原作者所有,共享出来方便大家查阅

 

 


分享 举报