实现思路：
定义了个快捷键ctrl+/ ，当按此键时，会出现一个弹出窗口，采用JWINDOW来实现。
选择代码段便用了JList来实现。
下面直接上代码。
package org.swan.mybatis.ui.common;
import java.awt.Color;
import java.awt.Component;
import java.awt.Point;
import java.awt.Window;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;
import javax.swing.text.Caret;
import javax.swing.text.JTextComponent;
@SuppressWarnings("serial")
public class MyCodeAssistant extends JDialog{
/**
* 代码填充后，把光标直接定义到此位置
*/
public static final String CURSOR = "&CURSOR;";
public static final String SELECT = "$0";
JTextComponent component;
JWindow tipWin = null;
private JList<ReplacePair> list = new JList<>(new DefaultListModel<ReplacePair>());
public void bind(final JTextComponent component,final Window window)
{
this.tipWin =new JWindow(window);
list.setCellRenderer(new InnerListCellRenderer());
list.setBackground(new Color(255,255,220));
tipWin.getContentPane().add(new JScrollPane(list));
tipWin.setSize(400, 200);
tipWin.addFocusListener(new FocusListener() {
@Override
public void focusLost(FocusEvent e) {
tipWin.setVisible(false);
}
@Override
public void focusGained(FocusEvent e) {
}
});
list.getInputMap().put(KeyStroke.getKeyStroke((char)KeyEvent.VK_ENTER), "keyenter");
list.getInputMap().put(KeyStroke.getKeyStroke((char)KeyEvent.VK_ESCAPE), "esc");
list.getActionMap().put("keyenter", new SelectTip(list));
list.getActionMap().put("esc",new CloseTip());
this.component = component;
ActionMap map = component.getActionMap();
InputMap im = component.getInputMap();
im.put(KeyStroke.getKeyStroke(‘/‘,InputEvent.ALT_MASK), "tip");
map.put("tip", new ShowTip());
map.put("tipesc", new CloseTip());
map.put("tipup", new TipUpper(list));
map.put("tipdown", new TipDown(list));
map.put("tipenter", new SelectTip(list));
}
public static ReplacePair newPair(String pattern,String value)
{
return new ReplacePair(pattern, value);
}
public void setStringList(List<String> list)
{
((DefaultListModel<ReplacePair>)this.list.getModel()).clear();
for (String string : list) {
((DefaultListModel<ReplacePair>)this.list.getModel()).addElement(new ReplacePair("^.*$", string));
}
}
public void addString(String str)
{
((DefaultListModel<ReplacePair>)list.getModel()).addElement(new ReplacePair("^.*$",str));
}
public void setList(List<ReplacePair> list)
{
this.list.setListData(list.toArray(new ReplacePair[0]));
}
public void addList(ReplacePair pair)
{
((DefaultListModel<ReplacePair>)(list.getModel())).addElement(pair);
}
class CloseTip extends AbstractAction
{
@Override
public void actionPerformed(ActionEvent e) {
component.getInputMap().remove(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE,0));
component.getInputMap().remove(KeyStroke.getKeyStroke(KeyEvent.VK_UP,0));
component.getInputMap().remove(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN,0));
component.getInputMap().remove(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER,0));
tipWin.setVisible(false);
}
}
class ShowTip extends AbstractAction {
@Override
public void actionPerformed(ActionEvent e) {
Point p1 = component.getLocationOnScreen();
Point p2 = component.getCaret().getMagicCaretPosition();
if(p2==null)
p2 = new Point(0,0);
p1.translate(p2.x, p2.y);
p1.translate(0,component.getFont().getSize()+3);
tipWin.setLocation(p1);
list.setSelectedIndex(0);
component.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE,0),"tipesc");
component.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_UP,0),"tipup");
component.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN,0),"tipdown");
component.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER,0),"tipenter");
tipWin.setVisible(true);
component.requestFocus();
}
}
class SelectTip extends AbstractAction {
private JList<ReplacePair> list;
public SelectTip(JList<ReplacePair> list)
{
this.list = list;
}
@Override
public void actionPerformed(ActionEvent e) {
ReplacePair selectPair = list.getSelectedValue();
String selectStr = "";
if(selectPair == null)
{
if(list.getModel().getSize()>0)
selectPair = list.getModel().getElementAt(0);
else
return;
}
selectStr = getPairString(selectPair);
int offset = selectStr.length();
if(selectStr.indexOf(CURSOR)!=-1)//处理光标问题
{
offset = selectStr.indexOf(CURSOR);
selectStr = selectStr.replaceAll(CURSOR, "");
}
Caret caret = component.getCaret();
StringBuilder sb = new StringBuilder(component.getText());
int pos = caret.getDot();
if(component.getSelectedText()!=null)
{
pos = component.getSelectionStart();
sb.replace(component.getSelectionStart(), component.getSelectionEnd(), selectStr);
}else
sb.insert(pos, selectStr);
component.setText(sb.toString());
caret.setDot(pos + offset);
tipWin.setVisible(false);
component.getInputMap().remove(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE,0));
component.getInputMap().remove(KeyStroke.getKeyStroke(KeyEvent.VK_UP,0));
component.getInputMap().remove(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN,0));
component.getInputMap().remove(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER,0));
}
}
class TipUpper extends AbstractAction {
private JList<ReplacePair> list;
public TipUpper(JList<ReplacePair> list)
{
this.list = list;
}
@Override
public void actionPerformed(ActionEvent e) {
int pos = list.getSelectedIndex();
if (list.getModel().getSize() > 0) {
if (pos > 0)
list.setSelectedIndex(pos - 1);
else {
list.setSelectedIndex(list.getModel().getSize() - 1);
}
}
}
}
class TipDown extends AbstractAction {
private JList<ReplacePair> list;
public TipDown(JList<ReplacePair> list)
{
this.list = list;
}
@Override
public void actionPerformed(ActionEvent e) {
int pos = list.getSelectedIndex();
if (list.getModel().getSize() > 0) {
if (pos < list.getModel().getSize() - 1)
list.setSelectedIndex(pos + 1);
else
list.setSelectedIndex(0);
}
}
}
private String getPairString(ReplacePair v) {
String disLabel = "";
if(v.getTarget()!=null)
{
String tmpStr = component.getSelectedText();
if(tmpStr == null) tmpStr = "";
disLabel = tmpStr.replaceAll(v.getPattern(), v.getTarget());
}
return disLabel;
}
class InnerListCellRenderer extends DefaultListCellRenderer
{
@Override
public Component getListCellRendererComponent(JList<?> list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
ReplacePair v = (ReplacePair)value;
String disLabel= "";
disLabel = getPairString(v);
disLabel = disLabel.replaceAll(CURSOR, "");
if(disLabel.equals(""))
disLabel = " ";
Component component = super.getListCellRendererComponent(list, disLabel, index, isSelected, cellHasFocus);
if(component instanceof JLabel)
((JLabel)component).setToolTipText(disLabel);
return component;
}
}
static class ReplacePair
{
private String pattern;
private String target;
protected ReplacePair(String pattern, String target) {
this.pattern = pattern;
this.target = target;
}
public String getPattern() {
return pattern;
}
public void setPattern(String pattern) {
this.pattern = pattern;
}
public String getTarget() {
return target;
}
public void setTarget(String target) {
this.target = target;
}
}
public static void main(String[] args) {
JFrame jf = new JFrame();
jf.setSize(400,400);
JTextArea ta = new JTextArea();
jf.add(ta);
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MyCodeAssistant myAssistant= new MyCodeAssistant();
myAssistant.bind(ta,jf);
List<String> list = new ArrayList<String>();
list.add("333333333");
list.add("11"+MyCodeAssistant.CURSOR+"11");
list.add("222"+MyCodeAssistant.SELECT+"2222"+MyCodeAssistant.CURSOR+"22");
list.add("12"+MyCodeAssistant.SELECT+"3456"+MyCodeAssistant.CURSOR+"789");
ReplacePair pair = new MyCodeAssistant.ReplacePair("(.*)\\s(.*)", "$2 $1");
myAssistant.setStringList(list);
myAssistant.addList(pair);
}
}
原文地址：http://blog.csdn.net/fswan/article/details/24701453
