我有一个可编辑的JavaFX ComboBox。 用户必须只能
如何过滤掉所有其他键,修饰符等?
我已经阅读并使用了Key_Pressed,Key_Released之类的事件处理程序,但我无法找到实现上述目标的直接方法。
我使用的是Mac OS Yosemite,Java 8,最新版本的JavaFX和
public static final EventType<KeyEvent> KEY_TYPED
根本不起作用。
下面的代码是我的尝试。变量typedText存储所需的值。
comboBox.addEventHandler(KeyEvent.KEY_RELEASED, new EventHandler<KeyEvent>() {
private final String[] allowedItems = new String[]{"a","b","c","d","e","f",
"g","h","i","j","k","l","m","n","o","p","q","r",
"s","t","u","v","w","x","y","z"," ","(",")"};
private final List data = Arrays.asList(allowedItems);
private String tempInput;
public boolean containsCaseInsensitive(String s, List<String> l){
for (String string : l) {
if (string.equalsIgnoreCase(s)){
return true;
}
}
return false;
}
public void handle(KeyEvent event) {
boolean b;
b = event.isShiftDown();
if (b) {
if (event.getText().equals("(")) {
tempInput = "(";
} else if (event.getText().equals(")")){
tempInput = ")";
}
} else {
tempInput = event.getCode().toString().toLowerCase();
}
System.out.println("tempInput:"+tempInput);
if (containsCaseInsensitive(tempInput, data)) {
typedText = tempInput;
System.out.println("typedText:"+typedText);
}
}
});
}
答案 0 :(得分:1)
您可以获取编辑器,它是您的案例中的TextField,并向其添加TextFormatter,从而限制输入。
选项卡开箱即用,但“输入”按键是另一回事,我只是请求此示例中的焦点。通常你会导航到焦点遍历列表中的下一个项目,但是在JavaFX中还没有面向未来的api。
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.control.TextField;
import javafx.scene.control.TextFormatter;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
public class ComboBoxSample extends Application {
@Override
public void start(Stage stage) {
ComboBox<String> comboBox = new ComboBox<>();
comboBox.setEditable(true);
comboBox.getItems().addAll("A", "B", "C", "D", "E");
comboBox.setValue("A");
// restrict input
TextField textField = comboBox.getEditor();
TextFormatter<String> formatter = new TextFormatter<String>(change -> {
change.setText(change.getText().replaceAll("[^a-z ()]", ""));
return change;
});
textField.setTextFormatter(formatter);
// dummy textfield to jump to on ENTER press
TextField dummyTextField = new TextField();
comboBox.addEventFilter(KeyEvent.KEY_PRESSED, e -> {
if( e.getCode() == KeyCode.ENTER) {
dummyTextField.requestFocus();
e.consume();
}
});
HBox root = new HBox();
root.getChildren().addAll(comboBox, dummyTextField);
Scene scene = new Scene(root, 450, 250);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}