Java 如何在JTextArea中键入时显示自动完成?
我需要在用户在Java 如何在JTextArea中键入时显示自动完成?,java,swing,tooltip,jtextarea,Java,Swing,Tooltip,Jtextarea,我需要在用户在JTextArea中键入时显示建议(自动完成),有点像手机T9 我不知道如何在myTextAreaKeyTyped()事件中执行此操作 此应用程序是一个打字助手。它显示键盘上不存在的字符变体。 例如,您按“A”,它显示:1、Á:2、À:3…,如果您按1、2或3,“A”将被替换。 已经完成了,但是变量显示在我的JFrame底部的JLabel中,因为我不知道如何执行此操作 你能帮帮我吗?提前感谢。这里有一个小片段可以让你获得灵感。您可能需要重新组织一点代码,使其更易于维护,但它应该为您
JTextArea
中键入时显示建议(自动完成),有点像手机T9
我不知道如何在myTextAreaKeyTyped()事件中执行此操作
此应用程序是一个打字助手。它显示键盘上不存在的字符变体。
例如,您按“A”,它显示:1、Á:2、À:3…,如果您按1、2或3,“A”将被替换。
已经完成了,但是变量显示在我的JFrame
底部的JLabel
中,因为我不知道如何执行此操作
你能帮帮我吗?提前感谢。这里有一个小片段可以让你获得灵感。您可能需要重新组织一点代码,使其更易于维护,但它应该为您提供要点
基本上,我们监听关键事件(我认为监听文档事件与此无关,例如,如果用户粘贴了一些文本,我不希望出现“建议”面板),当插入符号后面至少有2个字符时,我们使用包含建议列表的弹出菜单提出一些建议(这里的建议真的没有意义,但将其与措辞结合起来不会太难)。至于你提到的捷径,这样做应该不会太难
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Point;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JTextArea;
import javax.swing.ListSelectionModel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.BadLocationException;
public class Test {
public class SuggestionPanel {
private JList list;
private JPopupMenu popupMenu;
private String subWord;
private final int insertionPosition;
public SuggestionPanel(JTextArea textarea, int position, String subWord, Point location) {
this.insertionPosition = position;
this.subWord = subWord;
popupMenu = new JPopupMenu();
popupMenu.removeAll();
popupMenu.setOpaque(false);
popupMenu.setBorder(null);
popupMenu.add(list = createSuggestionList(position, subWord), BorderLayout.CENTER);
popupMenu.show(textarea, location.x, textarea.getBaseline(0, 0) + location.y);
}
public void hide() {
popupMenu.setVisible(false);
if (suggestion == this) {
suggestion = null;
}
}
private JList createSuggestionList(final int position, final String subWord) {
Object[] data = new Object[10];
for (int i = 0; i < data.length; i++) {
data[i] = subWord + i;
}
JList list = new JList(data);
list.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
list.setSelectedIndex(0);
list.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
insertSelection();
}
}
});
return list;
}
public boolean insertSelection() {
if (list.getSelectedValue() != null) {
try {
final String selectedSuggestion = ((String) list.getSelectedValue()).substring(subWord.length());
textarea.getDocument().insertString(insertionPosition, selectedSuggestion, null);
return true;
} catch (BadLocationException e1) {
e1.printStackTrace();
}
hideSuggestion();
}
return false;
}
public void moveUp() {
int index = Math.min(list.getSelectedIndex() - 1, 0);
selectIndex(index);
}
public void moveDown() {
int index = Math.min(list.getSelectedIndex() + 1, list.getModel().getSize() - 1);
selectIndex(index);
}
private void selectIndex(int index) {
final int position = textarea.getCaretPosition();
list.setSelectedIndex(index);
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
textarea.setCaretPosition(position);
};
});
}
}
private SuggestionPanel suggestion;
private JTextArea textarea;
protected void showSuggestionLater() {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
showSuggestion();
}
});
}
protected void showSuggestion() {
hideSuggestion();
final int position = textarea.getCaretPosition();
Point location;
try {
location = textarea.modelToView(position).getLocation();
} catch (BadLocationException e2) {
e2.printStackTrace();
return;
}
String text = textarea.getText();
int start = Math.max(0, position - 1);
while (start > 0) {
if (!Character.isWhitespace(text.charAt(start))) {
start--;
} else {
start++;
break;
}
}
if (start > position) {
return;
}
final String subWord = text.substring(start, position);
if (subWord.length() < 2) {
return;
}
suggestion = new SuggestionPanel(textarea, position, subWord, location);
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
textarea.requestFocusInWindow();
}
});
}
private void hideSuggestion() {
if (suggestion != null) {
suggestion.hide();
}
}
protected void initUI() {
final JFrame frame = new JFrame();
frame.setTitle("Test frame on two screens");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new BorderLayout());
textarea = new JTextArea(24, 80);
textarea.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 1));
textarea.addKeyListener(new KeyListener() {
@Override
public void keyTyped(KeyEvent e) {
if (e.getKeyChar() == KeyEvent.VK_ENTER) {
if (suggestion != null) {
if (suggestion.insertSelection()) {
e.consume();
final int position = textarea.getCaretPosition();
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
textarea.getDocument().remove(position - 1, 1);
} catch (BadLocationException e) {
e.printStackTrace();
}
}
});
}
}
}
}
@Override
public void keyReleased(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_DOWN && suggestion != null) {
suggestion.moveDown();
} else if (e.getKeyCode() == KeyEvent.VK_UP && suggestion != null) {
suggestion.moveUp();
} else if (Character.isLetterOrDigit(e.getKeyChar())) {
showSuggestionLater();
} else if (Character.isWhitespace(e.getKeyChar())) {
hideSuggestion();
}
}
@Override
public void keyPressed(KeyEvent e) {
}
});
panel.add(textarea, BorderLayout.CENTER);
frame.add(panel);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (UnsupportedLookAndFeelException e) {
e.printStackTrace();
}
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Test().initUI();
}
});
}
}
导入java.awt.BorderLayout;
导入java.awt.Color;
导入java.awt.Point;
导入java.awt.event.KeyEvent;
导入java.awt.event.KeyListener;
导入java.awt.event.MouseAdapter;
导入java.awt.event.MouseEvent;
导入javax.swing.BorderFactory;
导入javax.swing.JFrame;
导入javax.swing.JList;
导入javax.swing.JPanel;
导入javax.swing.jpopmenu;
导入javax.swing.JTextArea;
导入javax.swing.ListSelectionModel;
导入javax.swing.SwingUtilities;
导入javax.swing.UIManager;
导入javax.swing.UnsupportedLookAndFeelException;
导入javax.swing.text.BadLocationException;
公开课考试{
公共类建议面板{
私人名单;
私有JPOppMenu弹出菜单;
私有字符串子字;
私有最终int插入位置;
公共建议面板(JTextArea textarea、int位置、字符串子词、点位置){
this.insertionPosition=位置;
this.subWord=子词;
popupMenu=新的JPopupMenu();
popupMenu.removeAll();
弹出菜单.setOpaque(false);
popupMenu.Setboorder(空);
添加(list=createSuggestionList(位置,子词),BorderLayout.CENTER);
显示(textarea,location.x,textarea.getBaseline(0,0)+location.y);
}
公共空间隐藏(){
popupMenu.setVisible(假);
如果(建议==此){
建议=无效;
}
}
私有JList createSuggestionList(最终整型位置,最终字符串子字){
对象[]数据=新对象[10];
对于(int i=0;i0){
如果(!Character.isWhitespace(text.charAt(start))){
开始--;
}否则{
启动++;
打破
}
}
如果(开始>位置){
返回;
}
最后一个字符串子单词=text.substring(开始,位置);
if(子字长度()<2){
返回;
}
建议=新建议pa