我正在开发一个 Java Swing 应用程序。该应用程序允许用户使用基本命令行。例如,用户只需输入 <strong>add "Something to be added."</strong>
即可添加事件.我想强调<strong>add</strong>
当用户键入此命令时。任何人都可以实现 jTextField 吗?
最佳答案
一个想法是使用 StyleDocument
和 DocumentFilter
这个其实是基于这个question ,但我不确定是否可以尝试使用 JTextField
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultHighlighter.DefaultHighlightPainter;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.DocumentFilter;
import javax.swing.text.DocumentFilter.FilterBypass;
import javax.swing.text.JTextComponent;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
public class TextFieldHighlighter {
public static void main(String[] args) {
new TextFieldHighlighter();
}
public TextFieldHighlighter() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JTextField field = new JTextField(new DefaultStyledDocument(), null, 20);
((AbstractDocument) field.getDocument()).setDocumentFilter(new HighlightDocumentFilter(field));
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
frame.add(field);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class HighlightDocumentFilter extends DocumentFilter {
private DefaultHighlightPainter highlightPainter = new DefaultHighlightPainter(Color.YELLOW);
private JTextComponent field;
private SimpleAttributeSet background;
public HighlightDocumentFilter(JTextComponent field) {
this.field = field;
background = new SimpleAttributeSet();
StyleConstants.setBackground(background, Color.RED);
}
@Override
public void insertString(FilterBypass fb, int offset, String text, AttributeSet attr) throws BadLocationException {
super.insertString(fb, offset, text, attr);
}
@Override
public void remove(FilterBypass fb, int offset, int length) throws BadLocationException {
super.remove(fb, offset, length);
}
@Override
public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
String match = "and";
super.replace(fb, offset, length, text, attrs);
int startIndex = offset - match.length();
if (startIndex >= 0) {
String last = fb.getDocument().getText(startIndex, match.length()).trim();
if (last.equalsIgnoreCase(match)) {
field.getHighlighter().addHighlight(startIndex, startIndex + match.length(), highlightPainter);
}
}
}
}
}
关于java - 在 jTextField 中设置突出显示颜色,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19399904/