我想创建一个自动建议文本框，它将在每个键释放事件中查询数据库。那部分很简单，但我想给它一个漂亮的视觉效果。类似于我们在 Facebook 搜索等网站上看到的自动建议文本框。
如何制作这样的界面？
一个天真的想法是在文本框下方放置一个 JList，并在找到一个时将其设置为可见。
有更好的想法或标准的做法吗？
问问题
88950 次
7 回答
47
@syb0rg 的答案更简单，因为它使用了第 3 方库。
但是我使用了另一种方法：
它使用一个名为的自定义类，该类AutoSuggestor接受 a JTextField，它Window的一个ArrayList<String>单词来检查输入的单词，背景颜色和文本颜色，建议焦点颜色以及不透明度值。通过传递JTextField引用DocumentListener添加了 a ，它将检查输入的单词以及是否显示建议以及如果是则显示什么建议。当输入一个单词时，DocumentListener将触发wordTyped(String wordTyped)当前输入的单词或（至少输入了多少个单词）的方法，wordTyped(..)该单词将与AutoSuggestors classes 字典中的那些进行检查，这是一个基本ArrayList的String可以即时设置，如下例所示：
（现在您必须使用鼠标并单击要自动完成的单词，或者使用DOWN横向建议和文本字段并在使用向下ENTER键遍历时选择建议。我尚未实现）：UP
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import javax.swing.AbstractAction;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JWindow;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;
import javax.swing.border.LineBorder;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
/**
* @author David
*/
public class Test {
public Test() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextField f = new JTextField(10);
AutoSuggestor autoSuggestor = new AutoSuggestor(f, frame, null, Color.WHITE.brighter(), Color.BLUE, Color.RED, 0.75f) {
@Override
boolean wordTyped(String typedWord) {
//create list for dictionary this in your case might be done via calling a method which queries db and returns results as arraylist
ArrayList<String> words = new ArrayList<>();
words.add("hello");
words.add("heritage");
words.add("happiness");
words.add("goodbye");
words.add("cruel");
words.add("car");
words.add("war");
words.add("will");
words.add("world");
words.add("wall");
setDictionary(words);
//addToDictionary("bye");//adds a single word
return super.wordTyped(typedWord);//now call super to check for any matches against newest dictionary
}
};
JPanel p = new JPanel();
p.add(f);
frame.add(p);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Test();
}
});
}
}
class AutoSuggestor {
private final JTextField textField;
private final Window container;
private JPanel suggestionsPanel;
private JWindow autoSuggestionPopUpWindow;
private String typedWord;
private final ArrayList<String> dictionary = new ArrayList<>();
private int currentIndexOfSpace, tW, tH;
private DocumentListener documentListener = new DocumentListener() {
@Override
public void insertUpdate(DocumentEvent de) {
checkForAndShowSuggestions();
}
@Override
public void removeUpdate(DocumentEvent de) {
checkForAndShowSuggestions();
}
@Override
public void changedUpdate(DocumentEvent de) {
checkForAndShowSuggestions();
}
};
private final Color suggestionsTextColor;
private final Color suggestionFocusedColor;
public AutoSuggestor(JTextField textField, Window mainWindow, ArrayList<String> words, Color popUpBackground, Color textColor, Color suggestionFocusedColor, float opacity) {
this.textField = textField;
this.suggestionsTextColor = textColor;
this.container = mainWindow;
this.suggestionFocusedColor = suggestionFocusedColor;
this.textField.getDocument().addDocumentListener(documentListener);
setDictionary(words);
typedWord = "";
currentIndexOfSpace = 0;
tW = 0;
tH = 0;
autoSuggestionPopUpWindow = new JWindow(mainWindow);
autoSuggestionPopUpWindow.setOpacity(opacity);
suggestionsPanel = new JPanel();
suggestionsPanel.setLayout(new GridLayout(0, 1));
suggestionsPanel.setBackground(popUpBackground);
addKeyBindingToRequestFocusInPopUpWindow();
}
private void addKeyBindingToRequestFocusInPopUpWindow() {
textField.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0, true), "Down released");
textField.getActionMap().put("Down released", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent ae) {//focuses the first label on popwindow
for (int i = 0; i < suggestionsPanel.getComponentCount(); i++) {
if (suggestionsPanel.getComponent(i) instanceof SuggestionLabel) {
((SuggestionLabel) suggestionsPanel.getComponent(i)).setFocused(true);
autoSuggestionPopUpWindow.toFront();
autoSuggestionPopUpWindow.requestFocusInWindow();
suggestionsPanel.requestFocusInWindow();
suggestionsPanel.getComponent(i).requestFocusInWindow();
break;
}
}
}
});
suggestionsPanel.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0, true), "Down released");
suggestionsPanel.getActionMap().put("Down released", new AbstractAction() {
int lastFocusableIndex = 0;
@Override
public void actionPerformed(ActionEvent ae) {//allows scrolling of labels in pop window (I know very hacky for now :))
ArrayList<SuggestionLabel> sls = getAddedSuggestionLabels();
int max = sls.size();
if (max > 1) {//more than 1 suggestion
for (int i = 0; i < max; i++) {
SuggestionLabel sl = sls.get(i);
if (sl.isFocused()) {
if (lastFocusableIndex == max - 1) {
lastFocusableIndex = 0;
sl.setFocused(false);
autoSuggestionPopUpWindow.setVisible(false);
setFocusToTextField();
checkForAndShowSuggestions();//fire method as if document listener change occured and fired it
} else {
sl.setFocused(false);
lastFocusableIndex = i;
}
} else if (lastFocusableIndex <= i) {
if (i < max) {
sl.setFocused(true);
autoSuggestionPopUpWindow.toFront();
autoSuggestionPopUpWindow.requestFocusInWindow();
suggestionsPanel.requestFocusInWindow();
suggestionsPanel.getComponent(i).requestFocusInWindow();
lastFocusableIndex = i;
break;
}
}
}
} else {//only a single suggestion was given
autoSuggestionPopUpWindow.setVisible(false);
setFocusToTextField();
checkForAndShowSuggestions();//fire method as if document listener change occured and fired it
}
}
});
}
private void setFocusToTextField() {
container.toFront();
container.requestFocusInWindow();
textField.requestFocusInWindow();
}
public ArrayList<SuggestionLabel> getAddedSuggestionLabels() {
ArrayList<SuggestionLabel> sls = new ArrayList<>();
for (int i = 0; i < suggestionsPanel.getComponentCount(); i++) {
if (suggestionsPanel.getComponent(i) instanceof SuggestionLabel) {
SuggestionLabel sl = (SuggestionLabel) suggestionsPanel.getComponent(i);
sls.add(sl);
}
}
return sls;
}
private void checkForAndShowSuggestions() {
typedWord = getCurrentlyTypedWord();
suggestionsPanel.removeAll();//remove previos words/jlabels that were added
//used to calcualte size of JWindow as new Jlabels are added
tW = 0;
tH = 0;
boolean added = wordTyped(typedWord);
if (!added) {
if (autoSuggestionPopUpWindow.isVisible()) {
autoSuggestionPopUpWindow.setVisible(false);
}
} else {
showPopUpWindow();
setFocusToTextField();
}
}
protected void addWordToSuggestions(String word) {
SuggestionLabel suggestionLabel = new SuggestionLabel(word, suggestionFocusedColor, suggestionsTextColor, this);
calculatePopUpWindowSize(suggestionLabel);
suggestionsPanel.add(suggestionLabel);
}
public String getCurrentlyTypedWord() {//get newest word after last white spaceif any or the first word if no white spaces
String text = textField.getText();
String wordBeingTyped = "";
if (text.contains(" ")) {
int tmp = text.lastIndexOf(" ");
if (tmp >= currentIndexOfSpace) {
currentIndexOfSpace = tmp;
wordBeingTyped = text.substring(text.lastIndexOf(" "));
}
} else {
wordBeingTyped = text;
}
return wordBeingTyped.trim();
}
private void calculatePopUpWindowSize(JLabel label) {
//so we can size the JWindow correctly
if (tW < label.getPreferredSize().width) {
tW = label.getPreferredSize().width;
}
tH += label.getPreferredSize().height;
}
private void showPopUpWindow() {
autoSuggestionPopUpWindow.getContentPane().add(suggestionsPanel);
autoSuggestionPopUpWindow.setMinimumSize(new Dimension(textField.getWidth(), 30));
autoSuggestionPopUpWindow.setSize(tW, tH);
autoSuggestionPopUpWindow.setVisible(true);
int windowX = 0;
int windowY = 0;
windowX = container.getX() + textField.getX() + 5;
if (suggestionsPanel.getHeight() > autoSuggestionPopUpWindow.getMinimumSize().height) {
windowY = container.getY() + textField.getY() + textField.getHeight() + autoSuggestionPopUpWindow.getMinimumSize().height;
} else {
windowY = container.getY() + textField.getY() + textField.getHeight() + autoSuggestionPopUpWindow.getHeight();
}
autoSuggestionPopUpWindow.setLocation(windowX, windowY);
autoSuggestionPopUpWindow.setMinimumSize(new Dimension(textField.getWidth(), 30));
autoSuggestionPopUpWindow.revalidate();
autoSuggestionPopUpWindow.repaint();
}
public void setDictionary(ArrayList<String> words) {
dictionary.clear();
if (words == null) {
return;//so we can call constructor with null value for dictionary without exception thrown
}
for (String word : words) {
dictionary.add(word);
}
}
public JWindow getAutoSuggestionPopUpWindow() {
return autoSuggestionPopUpWindow;
}
public Window getContainer() {
return container;
}
public JTextField getTextField() {
return textField;
}
public void addToDictionary(String word) {
dictionary.add(word);
}
boolean wordTyped(String typedWord) {
if (typedWord.isEmpty()) {
return false;
}
//System.out.println("Typed word: " + typedWord);
boolean suggestionAdded = false;
for (String word : dictionary) {//get words in the dictionary which we added
boolean fullymatches = true;
for (int i = 0; i < typedWord.length(); i++) {//each string in the word
if (!typedWord.toLowerCase().startsWith(String.valueOf(word.toLowerCase().charAt(i)), i)) {//check for match
fullymatches = false;
break;
}
}
if (fullymatches) {
addWordToSuggestions(word);
suggestionAdded = true;
}
}
return suggestionAdded;
}
}
class SuggestionLabel extends JLabel {
private boolean focused = false;
private final JWindow autoSuggestionsPopUpWindow;
private final JTextField textField;
private final AutoSuggestor autoSuggestor;
private Color suggestionsTextColor, suggestionBorderColor;
public SuggestionLabel(String string, final Color borderColor, Color suggestionsTextColor, AutoSuggestor autoSuggestor) {
super(string);
this.suggestionsTextColor = suggestionsTextColor;
this.autoSuggestor = autoSuggestor;
this.textField = autoSuggestor.getTextField();
this.suggestionBorderColor = borderColor;
this.autoSuggestionsPopUpWindow = autoSuggestor.getAutoSuggestionPopUpWindow();
initComponent();
}
private void initComponent() {
setFocusable(true);
setForeground(suggestionsTextColor);
addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent me) {
super.mouseClicked(me);
replaceWithSuggestedText();
autoSuggestionsPopUpWindow.setVisible(false);
}
});
getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true), "Enter released");
getActionMap().put("Enter released", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent ae) {
replaceWithSuggestedText();
autoSuggestionsPopUpWindow.setVisible(false);
}
});
}
public void setFocused(boolean focused) {
if (focused) {
setBorder(new LineBorder(suggestionBorderColor));
} else {
setBorder(null);
}
repaint();
this.focused = focused;
}
public boolean isFocused() {
return focused;
}
private void replaceWithSuggestedText() {
String suggestedWord = getText();
String text = textField.getText();
String typedWord = autoSuggestor.getCurrentlyTypedWord();
String t = text.substring(0, text.lastIndexOf(typedWord));
String tmp = t + text.substring(text.lastIndexOf(typedWord)).replace(typedWord, suggestedWord);
textField.setText(tmp + " ");
}
}
就目前而言，IMO 唯一可能需要的补充是：
- UP弹出自动建议框中项目的关键焦点可遍历性，以便我们可以向上移动。
如果有任何问题让我知道，我会看看我能做什么。但似乎运行良好（触摸木头）。
于 2013-01-07T10:33:20.400 回答
31
一个非常简单的方法是使用GlazedList自动完成的实现。启动和运行非常容易。你可以在这里找到它。
您可以在 JComboBox 上安装自动完成功能，只需一行 Glazed 代码，如下所示：
JComboBox comboBox = new JComboBox();
Object[] elements = new Object[] {"Cat", "Dog", "Lion", "Mouse"};
AutoCompleteSupport.install(comboBox, GlazedLists.eventListOf(elements));
还SwingX支持自动完成，可能比GlazedList. 你写的SwingX只是AutoCompleteDecorator.decorate(comboBox);
于 2013-01-06T21:50:22.163 回答
2
要使用 TextAutoCompleter 类，您需要下载 jar 文件 AutoCompleter.jar 并将其添加到项目的库文件夹中，这里是下载链接：http: //download1689.mediafire.com/4grrthscpsug/7pwzgefiomu392o/AutoCompleter.jar -Nawin
//在Main类中编写如下代码
package autocomplete;
import com.mxrck.autocompleter.TextAutoCompleter;
import java.sql.SQLException;
import javax.swing.JFrame;
import javax.swing.JTextField;
public class AutoComplete {
JFrame f=new JFrame();
JTextField t1;
AutoComplete() throws ClassNotFoundException, SQLException{
f.setSize(500,500);
f.setLocation(500,100);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setLayout(null);
f.setVisible(true);
t1=new JTextField();
t1.setBounds(50,80,200,20);
f.add(t1);
TextAutoCompleter complete=new TextAutoCompleter(t1);
DBConn conn=new DBConn();
conn.connection();
conn.retrieve();
while(conn.rs.next()){
complete.addItem(conn.rs.getString("number"));
}
}
public static void main(String[] args) throws ClassNotFoundException,
SQLException{
new AutoComplete();
}
}
//Create seperate class for database connection and write the following code
package autocomplete;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class DBConn {
Connection con; ResultSet rs;PreparedStatement stat;
public void connection() throws ClassNotFoundException, SQLException{
String url="jdbc:mysql://localhost:3306/";
String driver="com.mysql.jdbc.Driver";
String db="demo";
String username="root";
String password="root";
stat =null;
Class.forName(driver);
con=(Connection)DriverManager.getConnection
(url+db,username,password);
System.out.println("Connecttion SuccessFul");
}
public void retrieve() throws SQLException{
Statement stmt=con.createStatement();
String query="select number from phone";
rs = stmt.executeQuery(query);
System.out.println("retrieve succesfully");
}
}
于 2015-09-17T15:15:18.760 回答
2
我为该键添加了功能，并为该UP键添加了功能ESC以隐藏弹出窗口。除此之外，您还可以在构造一个AutoSuggestor对象时指定回调函数，选择从列表中的建议时会调用。
import javax.swing.border.LineBorder
import java.util.ArrayList
import javax.swing.event.DocumentListener
import java.awt.*
import java.awt.event.*
import javax.swing.*
import javax.swing.event.DocumentEvent
/**
* Author of the original version: David @ https://stackoverflow.com/users/1133011/david-kroukamp
*/
class Test {
init {
val frame = JFrame()
frame.defaultCloseOperation = JFrame.EXIT_ON_CLOSE
val f = JTextField(10)
val autoSuggestor = object : AutoSuggestor(f, frame, ArrayList(), Color.WHITE.brighter(), Color.BLUE, Color.RED, 0.75f) {
override fun wordTyped(typedWord: String?): Boolean {
//create list for dictionary this in your case might be done via calling a method which queries db and returns results as arraylist
val words = ArrayList<String>()
words.add("hello")
words.add("heritage")
words.add("happiness")
words.add("goodbye")
words.add("cruel")
words.add("car")
words.add("war")
words.add("will")
words.add("world")
words.add("wall")
setDictionary(words)
//addToDictionary("bye");//adds a single word
return super.wordTyped(typedWord)//now call super to check for any matches against newest dictionary
}
}
val p = JPanel()
p.add(f)
frame.add(p)
frame.pack()
frame.isVisible = true
}
companion object {
@JvmStatic
fun main(args: Array<String>) {
SwingUtilities.invokeLater { Test() }
}
}
}
internal open class AutoSuggestor(val textField: JTextField, val container: Window, words: ArrayList<String>, popUpBackground: Color, private val suggestionsTextColor: Color, private val suggestionFocusedColor: Color, opacity: Float, private val callback: (String) -> Unit = {}) {
private val suggestionsPanel: JPanel
val autoSuggestionPopUpWindow: JWindow
private var typedWord: String? = null
private val dictionary = ArrayList<String>()
private var currentIndexOfSpace: Int = 0
private var tW: Int = 0
private var tH: Int = 0
private val documentListener = object : DocumentListener {
override fun insertUpdate(de: DocumentEvent) {
checkForAndShowSuggestions()
}
override fun removeUpdate(de: DocumentEvent) {
checkForAndShowSuggestions()
}
override fun changedUpdate(de: DocumentEvent) {
checkForAndShowSuggestions()
}
}
val addedSuggestionLabels: ArrayList<SuggestionLabel>
get() {
val sls = ArrayList<SuggestionLabel>()
for (i in 0 until suggestionsPanel.componentCount) {
if (suggestionsPanel.getComponent(i) is SuggestionLabel) {
val sl = suggestionsPanel.getComponent(i) as SuggestionLabel
sls.add(sl)
}
}
return sls
}
//get newest word after last white space if any or the first word if no white spaces
val currentlyTypedWord: String
get() {
val text = textField.text
var wordBeingTyped = ""
if (text.contains(" ")) {
val tmp = text.lastIndexOf(" ")
if (tmp >= currentIndexOfSpace) {
currentIndexOfSpace = tmp
wordBeingTyped = text.substring(text.lastIndexOf(" "))
}
} else {
wordBeingTyped = text
}
return wordBeingTyped.trim { it <= ' ' }
}
init {
this.textField.document.addDocumentListener(documentListener)
setDictionary(words)
typedWord = ""
currentIndexOfSpace = 0
tW = 0
tH = 0
autoSuggestionPopUpWindow = JWindow(container)
autoSuggestionPopUpWindow.opacity = opacity
suggestionsPanel = JPanel()
suggestionsPanel.layout = GridLayout(0, 1)
suggestionsPanel.background = popUpBackground
addFocusListenersToHandleVisibilityOfPopUpWindow()
addKeyBindingToRequestFocusInPopUpWindow()
}
private fun addFocusListenersToHandleVisibilityOfPopUpWindow() {
textField.addFocusListener(object:FocusListener {
override fun focusLost(e: FocusEvent?) {
var focusOnPopUp = false
for (i in 0 until suggestionsPanel.componentCount) {
if (suggestionsPanel.getComponent(i) is SuggestionLabel) {
val label = suggestionsPanel.getComponent(i) as SuggestionLabel
if (label.isFocused)
focusOnPopUp = true
}
}
if (!focusOnPopUp && !shouldShowPopUpWindow) {
autoSuggestionPopUpWindow.isVisible = false
}
}
override fun focusGained(e: FocusEvent?) {
shouldShowPopUpWindow = false
}
})
}
private fun addKeyBindingToRequestFocusInPopUpWindow() {
textField.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0, true), "Escape released")
textField.actionMap.put("Escape released", object : AbstractAction() {
override fun actionPerformed(ae: ActionEvent) {// Hide the popwindow
shouldShowPopUpWindow = false
autoSuggestionPopUpWindow.isVisible = false
}
})
textField.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0, true), "Down released")
textField.actionMap.put("Down released", object : AbstractAction() {
override fun actionPerformed(ae: ActionEvent) {//focuses the first label on popwindow
for (i in 0 until suggestionsPanel.componentCount) {
if (suggestionsPanel.getComponent(i) is SuggestionLabel) {
(suggestionsPanel.getComponent(i) as SuggestionLabel).isFocused = true
autoSuggestionPopUpWindow.toFront()
autoSuggestionPopUpWindow.requestFocusInWindow()
suggestionsPanel.requestFocusInWindow()
suggestionsPanel.getComponent(i).requestFocusInWindow()
break
}
}
}
})
textField.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0, true), "Up released")
textField.actionMap.put("Up released", object : AbstractAction() {
override fun actionPerformed(ae: ActionEvent) {//focuses the last label on popwindow
for (i in 0 until suggestionsPanel.componentCount) {
val reverseIndex = suggestionsPanel.componentCount-1 - i
if (suggestionsPanel.getComponent(reverseIndex) is SuggestionLabel) {
(suggestionsPanel.getComponent(reverseIndex) as SuggestionLabel).isFocused = true
autoSuggestionPopUpWindow.toFront()
autoSuggestionPopUpWindow.requestFocusInWindow()
suggestionsPanel.requestFocusInWindow()
suggestionsPanel.getComponent(reverseIndex).requestFocusInWindow()
break
}
}
}
})
suggestionsPanel.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0, true), "Escape released")
suggestionsPanel.actionMap.put("Escape released", object : AbstractAction() {
override fun actionPerformed(ae: ActionEvent) {// Hide the popwindow
shouldShowPopUpWindow = false
autoSuggestionPopUpWindow.isVisible = false
}
})
suggestionsPanel.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0, true), "Up released")
suggestionsPanel.actionMap.put("Up released", object : AbstractAction() {
override fun actionPerformed(ae: ActionEvent) {//allows scrolling of labels in pop window (I know very hacky for now :))
val sls = addedSuggestionLabels
val max = sls.size
var indexOfFocusedSuggestion = -1
for (i in 0 until max) {
val sl = sls[i]
if ( sl.isFocused )
indexOfFocusedSuggestion = i
}
if (indexOfFocusedSuggestion - 1 < 0) {
sls[indexOfFocusedSuggestion].isFocused = false
autoSuggestionPopUpWindow.isVisible = false
setFocusToTextField()
checkForAndShowSuggestions()//fire method as if document listener change occured and fired it
}
else {
sls[indexOfFocusedSuggestion].isFocused = false
sls[indexOfFocusedSuggestion-1].isFocused = true
autoSuggestionPopUpWindow.toFront()
autoSuggestionPopUpWindow.requestFocusInWindow()
suggestionsPanel.requestFocusInWindow()
suggestionsPanel.getComponent(indexOfFocusedSuggestion-1).requestFocusInWindow()
}
}
})
suggestionsPanel.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0, true), "Down released")
suggestionsPanel.actionMap.put("Down released", object : AbstractAction() {
override fun actionPerformed(ae: ActionEvent) {//allows scrolling of labels in pop window (I know very hacky for now :))
val sls = addedSuggestionLabels
val max = sls.size
var indexOfFocusedSuggestion = -1
for (i in 0 until max) {
val sl = sls[i]
if ( sl.isFocused )
indexOfFocusedSuggestion = i
}
if (indexOfFocusedSuggestion + 1 >= max) {
sls[indexOfFocusedSuggestion].isFocused = false
autoSuggestionPopUpWindow.isVisible = false
setFocusToTextField()
checkForAndShowSuggestions()//fire method as if document listener change occured and fired it
}
else {
sls[indexOfFocusedSuggestion].isFocused = false
sls[indexOfFocusedSuggestion+1].isFocused = true
autoSuggestionPopUpWindow.toFront()
autoSuggestionPopUpWindow.requestFocusInWindow()
suggestionsPanel.requestFocusInWindow()
suggestionsPanel.getComponent(indexOfFocusedSuggestion+1).requestFocusInWindow()
}
}
})
}
private fun setFocusToTextField() {
container.toFront()
container.requestFocusInWindow()
textField.requestFocusInWindow()
}
var shouldShowPopUpWindow = false
private fun checkForAndShowSuggestions() {
typedWord = currentlyTypedWord
suggestionsPanel.removeAll()//remove previos words/jlabels that were added
//used to calcualte size of JWindow as new Jlabels are added
tW = 0
tH = 0
val added = wordTyped(typedWord)
if (!added) {
if (autoSuggestionPopUpWindow.isVisible) {
autoSuggestionPopUpWindow.isVisible = false
}
} else {
shouldShowPopUpWindow = true
showPopUpWindow()
setFocusToTextField()
}
}
protected fun addWordToSuggestions(word: String) {
val suggestionLabel = SuggestionLabel(word, suggestionFocusedColor, suggestionsTextColor, this, callback)
calculatePopUpWindowSize(suggestionLabel)
suggestionsPanel.add(suggestionLabel)
}
private fun calculatePopUpWindowSize(label: JLabel) {
//so we can size the JWindow correctly
if (tW < label.preferredSize.width) {
tW = label.preferredSize.width
}
tH += label.preferredSize.height
}
private fun showPopUpWindow() {
autoSuggestionPopUpWindow.contentPane.add(suggestionsPanel)
autoSuggestionPopUpWindow.minimumSize = Dimension(textField.width, 30)
autoSuggestionPopUpWindow.setSize(tW, tH)
autoSuggestionPopUpWindow.isVisible = true
var windowX = 0
var windowY = 0
windowX = container.getX() + textField.x + 5
if (suggestionsPanel.height > autoSuggestionPopUpWindow.minimumSize.height) {
windowY = container.getY() + textField.y + textField.height + autoSuggestionPopUpWindow.minimumSize.height
} else {
windowY = container.getY() + textField.y + textField.height + autoSuggestionPopUpWindow.height
}
autoSuggestionPopUpWindow.setLocation(windowX, windowY)
autoSuggestionPopUpWindow.minimumSize = Dimension(textField.width, 30)
autoSuggestionPopUpWindow.revalidate()
autoSuggestionPopUpWindow.repaint()
}
fun setDictionary(words: ArrayList<String>?) {
dictionary.clear()
if (words == null) {
return //so we can call constructor with null value for dictionary without exception thrown
}
for (word in words) {
dictionary.add(word)
}
}
fun addToDictionary(word: String) {
dictionary.add(word)
}
open fun wordTyped(typedWord: String?): Boolean {
if (typedWord!!.isEmpty()) {
return false
}
var suggestionAdded = false
for (word in dictionary) {//get words in the dictionary which we added
var fullyMatches = word.length >= typedWord.length
for (i in 0 until typedWord.length) {//each string in the word
if (word.length > i && !typedWord.toLowerCase().startsWith(word.toLowerCase()[i].toString(), i)) {//check for match
fullyMatches = false
break
}
}
if (fullyMatches) {
addWordToSuggestions(word)
suggestionAdded = true
}
}
return suggestionAdded
}
}
internal class SuggestionLabel(string: String, private val suggestionBorderColor: Color, private val suggestionsTextColor: Color, private val autoSuggestor: AutoSuggestor, private val callback: (String) -> Unit) : JLabel(string) {
var isFocused = false
set(focused) {
if (focused) {
border = LineBorder(suggestionBorderColor)
} else {
border = null
}
repaint()
field = focused
}
private val autoSuggestionsPopUpWindow: JWindow
private val textField: JTextField
init {
this.textField = autoSuggestor.textField
this.autoSuggestionsPopUpWindow = autoSuggestor.autoSuggestionPopUpWindow
initComponent()
}
private fun initComponent() {
isFocusable = true
foreground = suggestionsTextColor
addMouseListener(object : MouseAdapter() {
override fun mouseClicked(me: MouseEvent) {
super.mouseClicked(me)
replaceWithSuggestedText()
autoSuggestionsPopUpWindow.isVisible = false
}
})
getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0, true), "Enter released")
actionMap.put("Enter released", object : AbstractAction() {
override fun actionPerformed(ae: ActionEvent) {
replaceWithSuggestedText()
autoSuggestionsPopUpWindow.isVisible = false
}
})
getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0, true), "Escape released")
actionMap.put("Escape released", object : AbstractAction() {
override fun actionPerformed(ae: ActionEvent) {// Hide the popwindow
autoSuggestionsPopUpWindow.isVisible = false
}
})
}
private fun replaceWithSuggestedText() {
val suggestedWord = text
val text = textField.text
val typedWord = autoSuggestor.currentlyTypedWord
val t = text.substring(0, text.lastIndexOf(typedWord))
val tmp = t + text.substring(text.lastIndexOf(typedWord)).replace(typedWord, suggestedWord)
textField.text = tmp
callback(tmp)
}
}
注意：上面是用 Kotlin 编写的，但是如果你真的想要 Java 代码，你可以很容易地将它转换回 Java。
于 2019-02-25T12:13:20.593 回答
1
我想在我的 AVR 汇编器 IDE 中自动完成编辑器，所以我编写了一个与 Eclipse 中的自动完成功能类似的实现（CTRL-SPACE 激活、带有滚动条的下拉列表、光标键 + 鼠标导航）。它没有外部依赖，只是一个类。它应该适用于所有 JTextComponent 子类；您可以在 src/test 文件夹中找到一个使用示例。
于 2017-01-28T21:53:14.107 回答
0
将此行添加到第一个答案的私有 void addKeyBindingToRequestFocusInPopUpWindow() 以实现 UP 密钥。他的回答很完美。
//here I have to do my code for up key
//---------------------------------------------------------------------
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
textField.getInputMap(JComponent.WHEN_FOCUSED).put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0, true), "Up released");
textField.getActionMap().put("Up released", new AbstractAction() {
@Override
public void actionPerformed(ActionEvent ae) {//focuses the first label on popwindow
for (int i = suggestionsPanel.getComponentCount()-1; i >=0; i--) {
if (suggestionsPanel.getComponent(i) instanceof SuggestionLabel) {
((SuggestionLabel) suggestionsPanel.getComponent(i)).setFocused(true);
autoSuggestionPopUpWindow.toFront();
autoSuggestionPopUpWindow.requestFocusInWindow();
suggestionsPanel.requestFocusInWindow();
suggestionsPanel.getComponent(i).requestFocusInWindow();
break;
}
}
}
});
suggestionsPanel.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT).put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0, true), "Up released");
suggestionsPanel.getActionMap().put("Up released", new AbstractAction() {
//######int lastFocusableIndex = 0;
int lastFocusableIndex = 0;
//lastFocusableIndex=lastFocusableIndex___;
@Override
public void actionPerformed(ActionEvent ae) {//allows scrolling of labels in pop window (I know very hacky for now :))
ArrayList<SuggestionLabel> sls = getAddedSuggestionLabels();
int max = sls.size();
lastFocusableIndex=lastFocusableIndex___;
System.out.println("UP UP UP UP");//***//
System.out.println("max = "+String.valueOf(max));//***//
System.out.println("lastFocusableIndex = "+String.valueOf(lastFocusableIndex));//***//
System.out.println("UP UP UP UP");//***//
if (max > 1) {//more than 1 suggestion
for (int i = max-1; i >=0; i--) {
SuggestionLabel sl = sls.get(i);
if (sl.isFocused()) {
if (lastFocusableIndex == 0) {
lastFocusableIndex = max - 1;
lastFocusableIndex___=lastFocusableIndex;
sl.setFocused(false);
autoSuggestionPopUpWindow.setVisible(false);
setFocusToTextField();
checkForAndShowSuggestions();//fire method as if document listener change occured and fired it
} else {
sl.setFocused(false);
lastFocusableIndex = i;
lastFocusableIndex___=lastFocusableIndex;
}
} else if (lastFocusableIndex > i) {
if (i < max ) {
sl.setFocused(true);
autoSuggestionPopUpWindow.toFront();
autoSuggestionPopUpWindow.requestFocusInWindow();
suggestionsPanel.requestFocusInWindow();
suggestionsPanel.getComponent(i).requestFocusInWindow();
lastFocusableIndex = i;
lastFocusableIndex___=lastFocusableIndex;
break;
}
}
}
} else {//only a single suggestion was given
autoSuggestionPopUpWindow.setVisible(false);
setFocusToTextField();
checkForAndShowSuggestions();//fire method as if document listener change occured and fired it
}
}
});
于 2017-02-10T07:45:18.800 回答
0
我在项目中使用的一种工作方法是将 JTextField 放在 JComboBox 的顶部，并在您使用文档侦听器在 JTextField 中键入时打开底层组合框。您可能想要一个自定义组合框模型来更有效地更改项目，因为我认为默认模型只允许一次添加一个项目，这可能会影响性能。打开组合框我认为有一种方法可以显示它，如果你得到它的 UI。当我尝试在项目打开时更改项目时，我遇到了几个滚动错误，因此您可能需要关闭它，更改项目并重新显示。对于键盘的东西，您可以在 JTextField 中捕捉键盘按键并适当地调用 JComboBox。
于 2017-08-19T09:40:10.223 回答