如何使用
RichTextFX突出显示textarea的一部分?我是否需要将JAR文件添加到项目库中?
请指导我完成整个程序.
最佳答案 是的,您必须将jar添加到项目的构建路径中.
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import org.fxmisc.richtext.CodeArea;
import org.fxmisc.richtext.LineNumberFactory;
import org.fxmisc.richtext.StyleSpans;
import org.fxmisc.richtext.StyleSpansBuilder;
import org.fxmisc.richtext.demo.JavaKeywords;
public class MainFX extends Application {
private CodeArea codeArea = new CodeArea();
private String exampleString = "This is a WARNING for an INFO! Please stay tuned";
private static final String[] KEYWORDS = new String[] { "INFO", "WARNING" };
/* This keyword could get another color by css */
private static final String[] DEBUG_KEYWORD = new String[] { "DEBUG" };
private static final String KEYWORD_PATTERN = "\\b("
+ String.join("|", KEYWORDS) + ")\\b";
private static final String PAREN_PATTERN = "\\(|\\)";
private static final String BRACE_PATTERN = "\\{|\\}";
private static final String BRACKET_PATTERN = "\\[|\\]";
private static final String SEMICOLON_PATTERN = "\\;";
private static final String STRING_PATTERN = "\"([^\"]|\\\")*\"";
private static final Pattern PATTERN = Pattern.compile("(?<KEYWORD>"
+ KEYWORD_PATTERN + ")" + "|(?<PAREN>" + PAREN_PATTERN + ")"
+ "|(?<BRACE>" + BRACE_PATTERN + ")" + "|(?<BRACKET>"
+ BRACKET_PATTERN + ")" + "|(?<SEMICOLON>" + SEMICOLON_PATTERN
+ ")" + "|(?<STRING>" + STRING_PATTERN + ")");
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) {
primaryStage.setTitle("Richtext demo");
String stylesheet = JavaKeywords.class.getResource("java-keywords.css")
.toExternalForm();
IntFunction<String> format = (digits -> " %" + digits + "d ");
codeArea.setParagraphGraphicFactory(LineNumberFactory.get(codeArea,
format, stylesheet));
codeArea.textProperty().addListener((obs, oldText, newText) -> {
codeArea.setStyleSpans(0, computeHighlighting(newText));
});
codeArea.replaceText(0, 0, exampleString);
Scene scene = new Scene(new StackPane(codeArea), 600, 400);
scene.getStylesheets().add(stylesheet);
primaryStage.setScene(scene);
primaryStage.show();
}
/**
* For Content highlighting
*/
private static StyleSpans<Collection<String>> computeHighlighting(
String text) {
Matcher matcher = PATTERN.matcher(text);
int lastKwEnd = 0;
StyleSpansBuilder<Collection<String>> spansBuilder = new StyleSpansBuilder<>();
while (matcher.find()) {
String styleClass = matcher.group("KEYWORD") != null ? "keyword"
: matcher.group("PAREN") != null ? "paren" : matcher
.group("BRACE") != null ? "brace" : matcher
.group("BRACKET") != null ? "bracket" : matcher
.group("SEMICOLON") != null ? "semicolon" : matcher
.group("STRING") != null ? "string" : null; /* never happens */
assert styleClass != null;
spansBuilder.add(Collections.emptyList(), matcher.start()
- lastKwEnd);
spansBuilder.add(Collections.singleton(styleClass), matcher.end()
- matcher.start());
lastKwEnd = matcher.end();
}
spansBuilder.add(Collections.emptyList(), text.length() - lastKwEnd);
return spansBuilder.create();
}
}
和DEBUG的CSS:
.debug {-fx-fill: #8346F2;-fx-font-weight: bold;}
有关详细信息,请参阅this demo.