package com.example.client.utils;
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import java.awt.BorderLayout;
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import java.awt.Color;
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import java.awt.Component;
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import java.awt.Dimension;
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import java.awt.event.KeyListener;
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import java.awt.event.MouseAdapter;
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import java.awt.event.MouseEvent;
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import java.awt.event.MouseListener;
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import java.awt.event.MouseMotionAdapter;
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import java.awt.event.MouseMotionListener;
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import javax.swing.BorderFactory;
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import javax.swing.DefaultListCellRenderer;
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import javax.swing.JComboBox;
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import javax.swing.JComponent;
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import javax.swing.JLabel;
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import javax.swing.JList;
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import javax.swing.JPopupMenu;
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import javax.swing.JScrollPane;
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import javax.swing.JTree;
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import javax.swing.MenuSelectionManager;
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import javax.swing.SwingUtilities;
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import javax.swing.UIManager;
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import javax.swing.plaf.ComboBoxUI;
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import javax.swing.plaf.basic.ComboPopup;
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import javax.swing.plaf.metal.MetalComboBoxUI;
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import javax.swing.tree.TreeCellRenderer;
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import javax.swing.tree.TreeNode;
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import javax.swing.tree.TreePath;
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/**
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* 下拉树工具类
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* 2019年9月16日15:20:18
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* @author Administrator
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*
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*/
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@SuppressWarnings("serial")
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public class DownTheTree extends JComboBox{
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/**
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* 显示用的树
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*/
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private JTree tree;
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public DownTheTree() {
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this(new JTree());
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}
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public DownTheTree(JTree tree) {
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this.setTree(tree);
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}
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/**
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* 设置树
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*
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* @param tree
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* JTree
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*/
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public void setTree(JTree tree) {
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this.tree = tree;
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if (tree != null) {
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this.setSelectedItem(tree.getSelectionPath());
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this.setRenderer(new JTreeComboBoxRenderer());
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}
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this.updateUI();
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}
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/**
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* 取得树
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*
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* @return JTree
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*/
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public JTree getTree() {
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return tree;
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}
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/**
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* 设置当前选择的树路径
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*
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* @param o
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* Object
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*/
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public void setSelectedItem(Object o) {
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tree.setSelectionPath((TreePath) o);
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getModel().setSelectedItem(o);
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}
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public void updateUI() {
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ComboBoxUI cui = (ComboBoxUI) UIManager.getUI(this);
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if (cui instanceof MetalComboBoxUI) {
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cui = new MetalJTreeComboBoxUI();
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}
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setUI(cui);
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}
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// UI Inner classes -- one for each supported Look and Feel
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class MetalJTreeComboBoxUI extends MetalComboBoxUI {
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protected ComboPopup createPopup() {
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return new TreePopup(comboBox);
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}
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}
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/**
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*
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* Description: 树形结构而来的DefaultListCellRenderer
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*/
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class JTreeComboBoxRenderer extends DefaultListCellRenderer {
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public Component getListCellRendererComponent(JList list, Object value,
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int index, boolean isSelected, boolean cellHasFocus) {
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if (value != null) {
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TreePath path = (TreePath) value;
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TreeNode node = (TreeNode) path.getLastPathComponent();
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value = node;
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TreeCellRenderer r = tree.getCellRenderer();
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JLabel lb = (JLabel) r.getTreeCellRendererComponent(tree,
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value, isSelected, false, node.isLeaf(), index,
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cellHasFocus);
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return lb;
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}
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return super.getListCellRendererComponent(list, value, index,
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isSelected, cellHasFocus);
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}
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}
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/**
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* 测试
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*/
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/* public static void main(String args[]) {
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JFrame frame = new JFrame("JTreeComboBox 例子");
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frame.setSize(400, 320);
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Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
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frame.setLocation((d.width - frame.getSize().width) / 2,
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(d.height - frame.getSize().height) / 2);
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frame.getContentPane().setLayout(new FlowLayout());
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final DownTheTree box = new DownTheTree(new JTree());
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box.setPreferredSize(new Dimension(300, 21));
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frame.getContentPane().add(box);
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frame.setVisible(true);
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}*/
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}
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/**
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* <p>
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* Description: TreePopup
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* </p>
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*/
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@SuppressWarnings("serial")
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class TreePopup extends JPopupMenu implements ComboPopup {
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protected DownTheTree comboBox;
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protected JScrollPane scrollPane;
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protected MouseMotionListener mouseMotionListener;
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protected MouseListener mouseListener;
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private MouseListener treeSelectListener = new MouseAdapter() {
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public void mouseReleased(MouseEvent e) {
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JTree tree = (JTree) e.getSource();
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TreePath tp = tree.getPathForLocation(e.getPoint().x,
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e.getPoint().y);
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if (tp == null) {
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return;
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}
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comboBox.setSelectedItem(tp);
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togglePopup();
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MenuSelectionManager.defaultManager().clearSelectedPath();
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}
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};
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public TreePopup(JComboBox comboBox) {
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this.comboBox = (DownTheTree) comboBox;
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setBorder(BorderFactory.createLineBorder(Color.black));
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setLayout(new BorderLayout());
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setLightWeightPopupEnabled(comboBox.isLightWeightPopupEnabled());
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JTree tree = this.comboBox.getTree();
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if (tree != null) {
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scrollPane = new JScrollPane(tree);
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scrollPane.setBorder(null);
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add(scrollPane, BorderLayout.CENTER);
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tree.addMouseListener(treeSelectListener);
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}
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}
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public void show() {
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updatePopup();
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show(comboBox, 0, comboBox.getHeight());
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comboBox.getTree().requestFocus();
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}
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public void hide() {
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setVisible(false);
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comboBox.firePropertyChange("popupVisible", true, false);
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}
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protected JList list = new JList();
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public JList getList() {
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return list;
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}
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public MouseMotionListener getMouseMotionListener() {
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if (mouseMotionListener == null) {
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mouseMotionListener = new MouseMotionAdapter() {
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};
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}
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return mouseMotionListener;
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}
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public KeyListener getKeyListener() {
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return null;
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}
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public void uninstallingUI() {
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}
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/**
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* Implementation of ComboPopup.getMouseListener().
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*
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* @return a <code>MouseListener</code> or null
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* @see ComboPopup#getMouseListener
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*/
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public MouseListener getMouseListener() {
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if (mouseListener == null) {
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mouseListener = new InvocationMouseHandler();
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}
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return mouseListener;
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}
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protected void togglePopup() {
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if (isVisible()) {
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hide();
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} else {
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show();
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}
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}
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protected void updatePopup() {
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setPreferredSize(new Dimension(comboBox.getSize().width, 200));
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Object selectedObj = comboBox.getSelectedItem();
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if (selectedObj != null) {
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TreePath tp = (TreePath) selectedObj;
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((DownTheTree) comboBox).getTree().setSelectionPath(tp);
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}
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}
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protected class InvocationMouseHandler extends MouseAdapter {
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public void mousePressed(MouseEvent e) {
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if (!SwingUtilities.isLeftMouseButton(e) || !comboBox.isEnabled()) {
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return;
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}
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if (comboBox.isEditable()) {
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Component comp = comboBox.getEditor().getEditorComponent();
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if ((!(comp instanceof JComponent))
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|| ((JComponent) comp).isRequestFocusEnabled()) {
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comp.requestFocus();
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}
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} else if (comboBox.isRequestFocusEnabled()) {
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comboBox.requestFocus();
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}
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togglePopup();
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}
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}
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}
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