package com.connor.zf.util;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;
import javax.swing.ComboBoxModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;

import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Combo;
 
public class JAutoCompleteComboBox extends JComboBox {
	 
	private AutoCompleter completer;
 
	public JAutoCompleteComboBox() {
		super();
		addCompleter();
	}
 
	public JAutoCompleteComboBox(ComboBoxModel cm) {
		super(cm);
		addCompleter();
	}
 
	public JAutoCompleteComboBox(Object[] items) {
		super(items);
		addCompleter();
	}
 
	public JAutoCompleteComboBox(List v) {
		super((Vector) v);
		addCompleter();
	}
 
	private void addCompleter() {
		setEditable(true);
		completer = new AutoCompleter(this);
	}
 
	public void autoComplete(String str) {
		this.completer.autoComplete(str, str.length());
	}
 
	public String getText() {
		return ((JTextField) getEditor().getEditorComponent()).getText();
	}
 
	public void setText(String text) {
		((JTextField) getEditor().getEditorComponent()).setText(text);
	}
 
	public boolean containsItem(String itemString) {
		for (int i = 0; i < this.getModel().getSize(); i++) {
			String _item = " " + this.getModel().getElementAt(i);
			if (_item.equals(itemString))
				return true;
		}
		return false;
	}
	
 
	public static void main(String[] args) {
		JFrame frame = new JFrame();
		Object[] items = new Object[] { "", "abc ", "aab ", "aba ", "hpp ",
				"pp ", "hlp " };
		DefaultComboBoxModel model = new DefaultComboBoxModel();
		JAutoCompleteComboBox cmb = new JAutoCompleteComboBox();
		cmb.addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
				String actionCommand2 = e.getActionCommand();
				System.out.println("操作名："+actionCommand2);
				System.out.println("当前选中值1："+cmb.getText());
				System.out.println("当前选中值2："+cmb.getSelectedItem().toString());
			}
		});
		cmb.addItem("");
		cmb.addItem("成品");
		cmb.addItem("半成品");
		cmb.addItem("零件");
		cmb.addItem("啊");
		cmb.addItem("哈");
		model.addElement("");
		model.addElement("abc ");
		model.addElement("aab ");
		model.addElement("aba ");
		model.addElement("hpp ");
		model.addElement("pp ");
		model.addElement("hlp ");
		frame.getContentPane().add(cmb);
		frame.setSize(400, 80);
		frame.setVisible(true);
//		try {
//			Thread.sleep(1*1000);
//			System.out.println(cmb.getText());
//		} catch (InterruptedException e) {
//			// TODO Auto-generated catch block
//			e.printStackTrace();
//		}
	}
	class AutoCompleter implements KeyListener, ItemListener {
		 
		private JComboBox owner = null;
		private JTextField editor = null;
		private ComboBoxModel model = null;
	 
		public AutoCompleter(JComboBox comboBox) {
			owner = comboBox;
			editor = (JTextField) comboBox.getEditor().getEditorComponent();
			editor.addKeyListener(this);
//			editor.getDocument().addDocumentListener(new DocumentListener() {
//				
//				@Override
//				public void removeUpdate(DocumentEvent e) {
//					System.out.println("删除");
//					int caretPosition = editor.getCaretPosition();
//					String str = editor.getText();
//					autoComplete(str, caretPosition);
//				}
//				
//				@Override
//				public void insertUpdate(DocumentEvent e) {
//					System.out.println("新增");
//				}
//				
//				@Override
//				public void changedUpdate(DocumentEvent e) {
//					System.out.println("修改");
//				}
//			});
			model = comboBox.getModel();
	 
			owner.addItemListener(this);
		}
	 
		public void keyTyped(KeyEvent e) {
		}
	 
		public void keyPressed(KeyEvent e) {
		}
	 
		public void keyReleased(KeyEvent e) {
			char ch = e.getKeyChar();
//			if (ch == KeyEvent.CHAR_UNDEFINED || Character.isISOControl(ch)
//					|| ch == KeyEvent.VK_DELETE)
//				return;
//			System.out.println("str="+str);
//			System.out.println("caretPosition="+caretPosition);
//			if (str.length() == 0)
//				return;
			
//			if(ch == KeyEvent.VK_ENTER) {
//				System.out.println("执行检索");
//				int caretPosition = editor.getCaretPosition();
//				String str = editor.getText();
//				autoComplete(str, caretPosition);
//			}
			
			new Thread(new Runnable() {
				
				@Override
				public void run() {
					// TODO Auto-generated method stub
					try {
						Thread.sleep(500);
						int caretPosition = editor.getCaretPosition();
						String str = editor.getText();
						autoComplete(str, caretPosition);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}).start();
		}
		
		/**
		 * 自动完成。根据输入的内容，在列表中找到相似的项目.
		 */
		protected void autoComplete(String strf, int caretPosition) {
			System.out.println("当前光标下标："+caretPosition);
			Object[] opts;
			opts = getMatchingOptions(strf.substring(0, caretPosition));
			if (owner != null) {
				model = new DefaultComboBoxModel(opts);
				owner.setModel(model);
			}
			if (opts.length > 0) {
				String str = opts[0].toString();
				try {
					
					editor.setCaretPosition(caretPosition);
				}catch (Exception e) {
				}
				if (owner != null) {
					try {
						owner.showPopup();
					} catch (Exception ex) {
						ex.printStackTrace();
					}
				}
			}
		}
	 
		/**
		 * 
		 * 找到相似的项目, 并且将之排列到数组的最前面。
		 * 
		 * @param str
		 * @return 返回所有项目的列表。
		 */
		protected Object[] getMatchingOptions(String str) {
//			System.out.println("str2="+str);
			List v = new Vector();
			List v1 = new Vector();
			if("".equals(str)) {
				boolean hasempty = false;
				for (int k = 0; k < model.getSize(); k++) {
					Object itemObj = model.getElementAt(k);
					if (itemObj != null) {
						String item = itemObj.toString();
						if(!"".equals(item))
							item = item.toLowerCase();
						if (item.equals(str)) {
							hasempty = true;
							v.add(model.getElementAt(k));
						}else {
							v1.add(model.getElementAt(k));
						}
					} else {
						hasempty = true;
						v1.add(model.getElementAt(k));
					}
				}
				if(!hasempty) {
					v.add("");
				}
			}else {
				
				for (int k = 0; k < model.getSize(); k++) {
					Object itemObj = model.getElementAt(k);
					if (itemObj != null) {
						String item = itemObj.toString().toLowerCase();
						if (item.startsWith(str.toLowerCase()))
							v.add(model.getElementAt(k));
						else
							v1.add(model.getElementAt(k));
					} else
						v1.add(model.getElementAt(k));
				}
			}
			for (int i = 0; i < v1.size(); i++) {
				v.add(v1.get(i));
			}
			if (v.isEmpty())
				v.add(str);
			return v.toArray();
		}
	 
		public void itemStateChanged(ItemEvent event) {
			if (event.getStateChange() == ItemEvent.SELECTED) {
				int caretPosition = editor.getCaretPosition();
				if (caretPosition != -1) {
					try {
						editor.moveCaretPosition(caretPosition);
					} catch (IllegalArgumentException ex) {
						ex.printStackTrace();
					}
				}
			}
		}
	}
}