autotextfield.java

CRMS客户关系管理系统(JAVA版）,这是一个客户关系管理系统。

package crms.ui;

import java.util.*;
import javax.swing.*;
import java.awt.event.*;



public class AutoTextField extends JTextField implements KeyListener {
	public static final int DEFAULT_MIN_COMPARE_LENGTH = 2;

	protected List search_list = null;
	protected int min_compare_length = DEFAULT_MIN_COMPARE_LENGTH;

	protected boolean automatic = false;
	protected boolean completeEnabled = true;

	public AutoTextField() {
		this(null, DEFAULT_MIN_COMPARE_LENGTH);
	}

	public AutoTextField(List search_list, int min_compare_length) {
		super();

		this.addKeyListener( this );
		setSearchList(search_list);
	}

	// property functions
	public void setSearchList(List new_list) {
		search_list = new_list;

		/*
		System.out.println("Found staff:");
		for (int i=0; i < search_list.size(); i++)
			System.out.println(search_list.get(i));
		*/
	}
	public List getSearchList() {
		return search_list;
	}
	public void setMinCompareLength(int new_length) {
		min_compare_length = new_length;
	}
	public int getMinCompareLength() {
		return min_compare_length;
	}

	/** Determine whether the current text display has been automatically completed 
	 *
	 * @return Current automatic completion status
     */
	public boolean isAutomatic() {
		return automatic;
	}


	protected void autoComplete(String search) {
		if (search_list == null) { return; }
		if (search.length() < min_compare_length) { return; } 

		//completeEnabled = false;

		for (int i = 0; i < search_list.size(); i++) {
			String compare = (String)search_list.get(i);
			if (compare.startsWith(search)) {
				int cpos = search.length();
				setText(compare);
				setCaretPosition(cpos);
				setSelectionStart(cpos);
				setSelectionEnd(compare.length());

				automatic = true;

				break;
			}
		}
		//completeEnabled = true;
	}
		


	// required functions to satisfy the KeyListener class
	public void keyTyped(KeyEvent e) { }

	/** Handle the key press event, invalidating the auto completion status.  This is significant
	 * if you are trying to determine whether or not the current text is automatic or not.
	 * The logic here is that if the user has pressed a key then it is no longer under automatic control.
	 */
	public void keyPressed(KeyEvent e) { 
		automatic = false;
	}

	// trigger off the auto complete search function
	public void keyReleased(KeyEvent e) { 
		char c = e.getKeyChar();
		if (completeEnabled && (Character.isDigit(c) || Character.isLetter(c))) {
			// only allow up to selection start for the compare characters
			// fixes bug where the user types really quickly
			String search = this.getText().substring(0, getSelectionStart());
			autoComplete(search);
		}
	}
}