我有一个ListProperty，我在其中从数据库加载应用程序操作员列表。我想只显示在ComboBox中具有活动状态的运算符。
我试图在修改ListProperty时过滤它，但是当我只更新操作员状态时它不起作用。我还试图找到一种方法将运算符列表绑定到filteredList。
我的两个模特：
Operator.java
/**
* Model representing an operator in the application.
*
* @author Mathieu DARÉ
*/
package com.dare.tkpf.esatraceability.model;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
public class Operator {
//
// Attributes of the operator...
//
private IntegerProperty IDProperty;
private StringProperty firstNameProperty;
private StringProperty lastNameProperty;
private ObjectProperty<OperatorStatus> statusProperty;
private ObjectProperty<LocalDateTime> dateTimeAddedProperty;
private StringProperty dateTimeAddedStringProperty;
/**
* Constructor of the Operator.
*
* @param ID The operator's ID.
* @param firstName The operator's first name.
* @param lastName The operator's last name.
* @param status The operator's status.
* @param datetimeAdded The date/time of when the operator has been added.
*/
public Operator(int ID, String firstName, String lastName, OperatorStatus status, LocalDateTime dateTimeAdded) {
this.IDProperty = new SimpleIntegerProperty(ID);
this.firstNameProperty = new SimpleStringProperty(firstName);
this.lastNameProperty = new SimpleStringProperty(lastName);
this.statusProperty = new SimpleObjectProperty<OperatorStatus>(status);
this.dateTimeAddedProperty = new SimpleObjectProperty<LocalDateTime>(dateTimeAdded);
this.dateTimeAddedStringProperty = new SimpleStringProperty( dateTimeAddedProperty.get().format( DateTimeFormatter.ofPattern("'le' dd/MM/yyyy 'à' HH:mm:ss") ) );
}
//
// Setter, getters for the operator's ID...
//
/**
* Setter for the operator's ID.
*
* @param ID The ID of the operator.
*/
public void setID(int ID) {
this.IDProperty.set(ID);
}
/**
* Getter for the operator's ID.
*
* @return The ID of the operator.
*/
public int getID() {
return this.IDProperty.get();
}
/**
* Getter for the operator's ID property.
*
* @return The ID property of the operator.
*/
public IntegerProperty IDProperty() {
return this.IDProperty;
}
//
// Setter, getters for the operator's first name...
//
/**
* Setter for the operator's first name.
*
* @param firstName The first name of the operator.
*/
public void setFirstName(String firstName) {
this.firstNameProperty.set(firstName);
}
/**
* Getter for the operator's first name.
*
* @return The first name of the operator.
*/
public String getFirstName() {
return this.firstNameProperty.get();
}
/**
* Getter for the operator's first name property.
*
* @return The first name property of the operator.
*/
public StringProperty firstNameProperty() {
return this.firstNameProperty;
}
//
// Setter, getters for the operator's last name...
//
/**
* Setter for the operator's last name.
*
* @param lastName The last name of the operator.
*/
public void setLastName(String lastName) {
this.lastNameProperty.set(lastName);
}
/**
* Getter for the operator's last name.
*
* @return The last name of the operator.
*/
public String getLastName() {
return this.lastNameProperty.get();
}
/**
* Getter for the operator's last name property.
*
* @return The last name property of the operator.
*/
public StringProperty lastNameProperty() {
return this.lastNameProperty;
}
//
// Setter, getters for the operator's status...
//
/**
* Setter for the operator's status.
*
* @param status The status of the operator.
*/
public void setStatus(OperatorStatus status) {
this.statusProperty.get().setID( status.getID() );
this.statusProperty.get().setDescription( status.getDescription() );
}
/**
* Getter for the operator's status.
*
* @return The status of the operator.
*/
public OperatorStatus getStatus() {
return this.statusProperty.get();
}
/**
* Getter for the operator's status property.
*
* @return The status property of the part.
*/
public ObjectProperty<OperatorStatus> statusProperty() {
return this.statusProperty;
}
/**
* Getter for the operator's status description.
*
* @return The status description of the operator.
*/
public String getStatusDescription() {
return this.statusProperty.get().descriptionProperty().get();
}
/**
* Getter for the operator's status description property.
*
* @return The status description property of the part.
*/
public StringProperty statusDescriptionProperty() {
return this.statusProperty.get().descriptionProperty();
}
//
// Setter, getters for the date/time the operator has been added...
//
/**
* Setter for the date/time the operator has been added.
*
* @param datetimeAdded The date/time the operator has been added.
*/
public void setDateTimeAdded(LocalDateTime datetimeAdded) {
this.dateTimeAddedProperty.set(datetimeAdded);
this.dateTimeAddedStringProperty = new SimpleStringProperty( dateTimeAddedProperty.get().format( DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm:ss") ) );
}
/**
* Getter for the date/time the operator has been added.
*
* @return The date/time the operator has been added.
*/
public LocalDateTime getDateTimeAdded() {
return this.dateTimeAddedProperty.get();
}
/**
* Getter for the date/time property of when the operator has been added.
*
* @return The date/time property of when the operator has been added.
*/
public ObjectProperty<LocalDateTime> dateTimeAddedProperty() {
return this.dateTimeAddedProperty;
}
/**
* Getter for the date/time string property of when the operator has been added.
*
* @return The date/time string property of when the operator has been added.
*/
public StringProperty dateTimeAddedStringProperty() {
return this.dateTimeAddedStringProperty;
}
//
// Utility methods...
//
/**
* Method converting the model into a string describing the operator (For direct use in the UI).
*
* @return The string describing the operator.
*/
@Override
public String toString() {
return getFirstName() + " " + getLastName();
}
}
OperatorStatus.java
/**
* Model representing an operator status in the application.
*
* @author Mathieu DARÉ
*/
package com.dare.tkpf.esatraceability.model;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
public class OperatorStatus {
//
// Attributes of the operator status...
//
private IntegerProperty IDProperty;
private StringProperty descriptionProperty;
/**
* Constructor of the operator status.
*
* @param ID The operator status' ID.
* @param description The operator status' description.
*/
public OperatorStatus(int ID, String description) {
this.IDProperty = new SimpleIntegerProperty(ID);
this.descriptionProperty = new SimpleStringProperty(description);
}
//
// Setter, getters for the operator status' ID...
//
/**
* Setter for the operator status' ID.
*
* @param ID The ID of the operator status.
*/
public void setID(int ID) {
this.IDProperty.set(ID);
}
/**
* Getter for the operator status' ID.
*
* @return The ID of the operator status.
*/
public int getID() {
return this.IDProperty.get();
}
/**
* Getter for the operator status' ID property.
*
* @return The ID property of the operator status.
*/
public IntegerProperty IDProperty() {
return this.IDProperty;
}
//
// Setter, getters for the operator status' description...
//
/**
* Setter for the operator status' description.
*
* @param description The description of the operator status.
*/
public void setDescription(String description) {
this.descriptionProperty.set(description);
}
/**
* Getter for the operator status' description.
*
* @return The description of the operator status.
*/
public String getDescription() {
return this.descriptionProperty.get();
}
/**
* Getter for the operator status' description property.
*
* @return The description property of the operator status.
*/
public StringProperty descriptionProperty() {
return this.descriptionProperty;
}
//
// Utility methods...
//
/**
* Method converting the operator status to string.
*
* @return The description of the status.
*/
@Override
public String toString() {
return getDescription();
}
}
我的应用程序的数据持有者，我想在其中创建运算符列表的过滤版本，以便在组合框中使用：
ESATraceabilityDataHolder.java
/**
* Data holder of the application. Contains all the properties and observable data shared through the entire application.
*
* @author Mathieu DARÉ
*/
package com.dare.tkpf.esatraceability;
import javafx.beans.property.ListProperty;
import javafx.beans.property.SimpleListProperty;
import com.dare.tkpf.esatraceability.model.NomenclatureStatus;
import com.dare.tkpf.esatraceability.model.Operator;
import com.dare.tkpf.esatraceability.model.OperatorStatus;
import com.dare.tkpf.esatraceability.model.Part;
public class ESATraceabilityDataHolder {
//
// Instance of the data holder...
//
private static ESATraceabilityDataHolder instance = null;
//
// Reference toward the app DBMS...
//
private static ESATraceabilityDBMS dbms = ESATraceabilityDBMS.getInstance();
//
// Properties and observable values of the application...
//
private static ListProperty<OperatorStatus> operatorStatuses = null;
private static ListProperty<Operator> operators = null;
private static ListProperty<Part> halfFinished = null;
private static ListProperty<NomenclatureStatus> nomenclatureStatuses = null;
//
// Constructor and base methods of the data holder...
//
/**
* Constructor of the data holder.
*/
private ESATraceabilityDataHolder() {
// Retrieval of the base data from the database at launch...
operatorStatuses = new SimpleListProperty<>( dbms.getOperatorsStatuses() );
operators = new SimpleListProperty<>( dbms.getOperators() );
halfFinished = new SimpleListProperty<>( dbms.getHalfFinished() );
nomenclatureStatuses = new SimpleListProperty<>( dbms.getNomenclatureStatuses() );
}
/**
* Getter of the data holder instance.
*
* @return Instance of the data holder.
*/
public static ESATraceabilityDataHolder getInstance() {
// If the data holder doesn't exist yet, we instantiate it...
if( instance == null ) { instance = new ESATraceabilityDataHolder(); }
return instance;
}
//
// Getters for the shared data of the application...
//
/**
* Getter for the operator statuses list.
*
* @return The list of the operator statuses.
*/
public ListProperty<OperatorStatus> getOperatorStatuses() {
return operatorStatuses;
}
/**
* Getter for the operators list.
*
* @return The list of all the operators.
*/
public ListProperty<Operator> getOperators() {
return operators;
}
/**
* Getter for the half-finished list.
*
* @return The list of all the half-finished.
*/
public ListProperty<Part> getHalfFinished() {
return halfFinished;
}
/**
* Getter for the nomenclature statuses' list.
*
* @return The list of the operator statuses.
*/
public ListProperty<NomenclatureStatus> getNomenclatureStatuses() {
return nomenclatureStatuses;
}
}
提前致谢。
答案 0 :(得分：1)
首先创建ObservableList<Operator>，如果operatorStatus或其id发生更改，则会触发更新通知。这可以通过创建可观察列表并指定extractor：
ESATraceabilityDataHolder data = ESATraceabilityDataHolder.getInstance();
ObservableList<Operator> operators = FXCollections.observableList(data.getOperators().get(),
operator -> new Observable[] {Bindings.select(operator.statusProperty(), "ID")});
现在创建一个FilteredList，用于过滤状态id：
final int statusActiveId = ... ;
FilteredList<Operator> activeOperators = new FilteredList<>(operators, operator ->
operator.getStatus().getId() == statusActiveId );
然后
ComboBox<Operator> combo = new ComboBox<>(activeOperators);