我改进了之前的 TextField 验证实现，这次使用绑定制作了一个真正的自定义控件，并进行了实时验证。它可以与 FXML 一起使用，而无需更多 Java 代码。
import javafx.beans.binding.BooleanBinding;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.ReadOnlyBooleanProperty;
import javafx.beans.property.ReadOnlyIntegerProperty;
import javafx.beans.property.ReadOnlyStringProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.control.TextField;
import javafx.scene.effect.BlurType;
import javafx.scene.effect.DropShadow;
import javafx.scene.effect.Effect;
import javafx.scene.paint.Color;
/**
* <p>
* TextField with regex-based real-time input validation.
* JavaFX 2 and FXML compatible. </p>
* <p>
* FXML code example:<div>
* {@code <ValidatedTextField fx:id="validatedTextField" minLength="1" maxLength="1" mask="^[0-9]*$" />}
* </div>
* </p>
*
* @author 82300009
*/
public final class ValidatedTextField extends TextField {
private final BooleanProperty invalid = new SimpleBooleanProperty(false);
private final StringProperty mask;
private final IntegerProperty minLength;
private final IntegerProperty maxLength;
private Effect invalidEffect = new DropShadow(BlurType.GAUSSIAN, Color.RED, 4, 0.0, 0, 0);
public ValidatedTextField() {
super();
this.mask = new SimpleStringProperty(".");
this.minLength = new SimpleIntegerProperty(-1);
this.maxLength = new SimpleIntegerProperty(-1);
bind();
}
public ValidatedTextField(String mask, int minLength, int maxLength, boolean nullable) {
this(mask, minLength, maxLength, nullable, null);
}
public ValidatedTextField(String mask, int minLength, int maxLength, boolean nullable, String string) {
super(string);
this.mask = new SimpleStringProperty(mask);
this.minLength = new SimpleIntegerProperty(minLength);
this.maxLength = new SimpleIntegerProperty(maxLength);
bind();
}
public ReadOnlyBooleanProperty invalidProperty() {
return invalid;
}
public ReadOnlyStringProperty maskProperty() {
return mask;
}
public ReadOnlyIntegerProperty minLengthProperty() {
return minLength;
}
public ReadOnlyIntegerProperty maxLengthProperty() {
return maxLength;
}
public boolean getInvalid() {
return invalid.get();
}
public String getMask() {
return mask.get();
}
public void setMask(String mask) {
this.mask.set(mask);
}
public int getMinLength() {
return minLength.get();
}
public void setMinLength(int minLength) {
this.minLength.set(minLength);
}
public int getMaxLength() {
return maxLength.get();
}
public void setMaxLength(int maxLength) {
this.maxLength.set(maxLength);
}
public Effect getInvalidEffect() {
return this.invalidEffect;
}
public void setInvalidEffect(Effect effect) {
this.invalidEffect = effect;
}
private void bind() {
this.invalid.bind(maskCheck().or(minLengthCheck()));
this.textProperty().addListener(new ChangeListener<String>() {
@Override
public void changed(ObservableValue<? extends String> ov, String t, String t1) {
if (textProperty().get().length() > maxLength.get()) {
setText(t);
}
}
});
this.invalid.addListener(new ChangeListener<Boolean>() {
@Override
public void changed(ObservableValue<? extends Boolean> ov, Boolean t, Boolean t1) {
if (t ^ t1) {
if (t1) {
// setStyle("-fx-font-weight: bold; -fx-text-fill: red;");
setEffect(invalidEffect);
} else {
// setStyle("-fx-font-weight: normal; -fx-text-fill: inherit;");
setEffect(null);
}
}
}
});
}
private BooleanBinding maskCheck() {
return new BooleanBinding() {
{
super.bind(textProperty(), mask);
}
@Override
protected boolean computeValue() {
return !textProperty().get().matches(mask.get());
}
};
}
private BooleanBinding minLengthCheck() {
return new BooleanBinding() {
{
super.bind(textProperty(), minLength);
}
@Override
protected boolean computeValue() {
return textProperty().get().length() < minLength.get();
}
};
}
private BooleanBinding maxLengthCheck() {
return new BooleanBinding() {
{
super.bind(textProperty(), maxLength);
}
@Override
protected boolean computeValue() {
return textProperty().get().length() > maxLength.get();
}
};
}
}
然而，关于“无效”的图形效果仍有一点微不足道。正如你在这里看到的：
this.invalid.addListener(new ChangeListener<Boolean>() {
@Override
public void changed(ObservableValue<? extends Boolean> ov, Boolean t, Boolean t1) {
if (t ^ t1) {
if (t1) {
// setStyle("-fx-font-weight: bold; -fx-text-fill: red;");
setEffect(invalidEffect);
} else {
// setStyle("-fx-font-weight: normal; -fx-text-fill: inherit;");
setEffect(null);
}
}
}
});
我尝试使用 setStyle 但使用-fx-font-weight: inherit; 破坏代码（不要为什么，因为它应该是它的默认值）。注入 StyleClass 不起作用，因为当 invalid 为 false 时我无法恢复它。
有什么线索吗？当然可以分离内部侦听器并附加另一个具有其他效果的外部侦听器（fi 显示绿色勾号而不是更改 TextField 效果）。
如果您介意，您可以自由使用代码:)