java - 必须自动突出显示从文本字段到文本区域的特定字符串

Question

我现在想知道如何自动突出显示文本区域中的文本。我进一步研究并找到了一种方法来做到这一点，但是我不确定它如何在用户输入搜索后仍然可以自动突出显示字符串。

注意:忽略单选按钮

这是我在单击搜索按钮时在操作事件中尝试的方法

 @FXML
 private void searchButton(ActionEvent actionEvent){
    String key = keyField.getText();
    String field = textField.getText();
    System.out.println(key);
    System.out.println(field);

        textField.getText();
        if (textField.getText().equals(key)) {
            textField.setStyle("-fx-highlight-fill: yellow; -fx-highlight-text-fill: black; -fx-font-size: 12px; ");
            textField.setEditable(false);
            textField.addEventFilter(MouseEvent.ANY, new EventHandler<MouseEvent>() {
                @Override
                public void handle(MouseEvent t) {
                    t.consume();
                }
            });

            Platform.runLater(new Runnable() {
                @Override
                public void run() {
                    textField.selectRange(13, 18);
                }
            });
        }

    ToggleGroup group = new ToggleGroup();
    rabinKarpp.setToggleGroup(group);
    kmp.setToggleGroup(group);
    naive.setToggleGroup(group);

    ArrayList indexes = new ArrayList();
    if (rabinKarpp.isSelected()){
        indexes = RabinKarp.process(field, key);
    }
    else if (kmp.isSelected()){
        indexes = KMPAlgo.process(field, key);
    }
    else if (naive.isSelected()){
        indexes = NaiveAlgo.process(field, key);
    }
    else if(!naive.isSelected() && !kmp.isSelected() && !rabinKarpp.isSelected()) {
        Alert alert = new Alert(Alert.AlertType.WARNING, "Select an algorithm first before proceeding.",ButtonType.OK);
        alert.showAndWait();
    }

}

预期的输出应该是突出显示“大家好”中的“hello”，但我仍然不知道如何做到这一点。

编辑:

代码现在看起来像这样，但遗憾的是亮点仍然不会出现。

@FXML protected void searchButton(ActionEvent actionEvent){

    String key = keyField.getText();
    String field = textField.getText();
    System.out.println(key);
    System.out.println(field);

    ToggleGroup group = new ToggleGroup();
    rabinKarpp.setToggleGroup(group);
    kmp.setToggleGroup(group);
    naive.setToggleGroup(group);

    ArrayList indexes = new ArrayList();
    if (rabinKarpp.isSelected()){
        indexes = RabinKarp.process(field, key);
    }
    else if (kmp.isSelected()){
        indexes = KMPAlgo.process(field, key);
    }
    else if (naive.isSelected()){
        indexes = NaiveAlgo.process(field, key);
    }
    else if(!naive.isSelected() && !kmp.isSelected() && !rabinKarpp.isSelected()) {
        Alert alert = new Alert(Alert.AlertType.WARNING, "Select an algorithm first before proceeding.",ButtonType.OK);
        alert.showAndWait();
    }
}

@Override
public void initialize(URL url, ResourceBundle resourceBundle) {
    List<List<Integer>> locations = new ArrayList();
    keyField.textProperty().addListener((o, oldValue, newValue) -> {
        Pattern pattern = Pattern.compile(newValue);
        Matcher matcher = pattern.matcher(textField.getText());

        locations.clear();
        if (newValue.isEmpty()) {
            // no highlighting for the empty search string
            textField.deselect();
        } else {
            int index = textField.getText().indexOf(newValue);
            if (index < 0) {
                // text not found
                textField.deselect();
            } else {
                while(matcher.find())
                {
                    List<Integer> tempList = new ArrayList<>();
                    tempList.add(matcher.start());
                    tempList.add(matcher.end());

                    locations.add(tempList);
                }
            }
        }
    });
    AtomicInteger currentIndex = new AtomicInteger(-1);
    downButton.setOnAction((t) -> {
        if(currentIndex.get() >= -1 && currentIndex.get() < locations.size() - 1)
        {
            textField.selectRange(locations.get(currentIndex.incrementAndGet()).get(0), locations.get(currentIndex.get()).get(1));
        }
    });

    upButton.setOnAction((t) -> {
        if(currentIndex.get() > 0 && currentIndex.get() <= locations.size())
        {
            textField.selectRange(locations.get(currentIndex.decrementAndGet()).get(0), locations.get(currentIndex.get()).get(1));
        }
    });
}

Answer 1

只需监听 TextField 的 text 属性即可实现此目的。请注意，您只能使用 TextArea 选择单个范围。如果您需要突出显示多个出现的情况，您可能需要使用 TextFlow 及其 rangeShape 方法，如 @Slaw 所建议。

@Override
public void start(Stage stage) throws IOException {
    TextArea textArea = new TextArea();
    VBox.setVgrow(textArea, Priority.ALWAYS);
    Random random = new Random();
    for (int l = 0; l < 10; l++) {
        for (int i = 0; i < 300; i++) {
            textArea.appendText(Character.toString('a' + random.nextInt('z'- 'a' + 1)));
        }
        textArea.appendText("\n");
    }

    TextField textField = new TextField();
    textField.textProperty().addListener((o, oldValue, newValue) -> {
        if (newValue.isEmpty()) {
            // no highlighting for the empty search string
            textArea.deselect();
        } else {
            int index = textArea.getText().indexOf(newValue);
            if (index < 0) {
                // text not found
                textArea.deselect();
            } else {
                // select first occurance
                textArea.selectRange(index, index + newValue.length());
            }
        }
    });

    Scene scene = new Scene(new VBox(textArea, textField));

    stage.setScene(scene);
    stage.show();
}

使用 fxml 注册监听器的正确位置是 initialize 方法。