所以我有一个TableView，它具有过滤功能和一些Labels用于显示结果。
找到x个人，x是VIP /非VIP，等等。
现在我要做的是计算与TableView中指定的值/字符串相匹配的项目数，以更新 x Labels文本并显示为结果。 （当更改TableView中的项目时，结果应显示并自动更新，而不选择任何行或列）。
对于总共Label人来说，我已经和table.getItems().size()做到了，所以还有3个要去。我的想法是在for loop内创建一个字符串/整数变量，并将其与TableView中的项目进行比较，然后将其包装在listener中以使其自动更新Labels ，但我不知道是否可能。
这是我的代码，您需要从here 添加 controlsfx jar。目前，我将所有Labels置于“清除”按钮的方法上，以手动对其进行更新。
import java.time.LocalDate;
import java.util.*;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.*;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.collections.transformation.FilteredList;
import javafx.collections.transformation.SortedList;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.FlowPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import org.controlsfx.control.CheckComboBox;
public class MainApp extends Application {
@Override
public void start(Stage primaryStage) {
TableView<Person> table = new TableView<>();
table.getSelectionModel().setCellSelectionEnabled(true);
table.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
table.getColumns().add(column("Name", Person::nameProperty));
table.getColumns().add(column("Email", Person::emailProperty));
table.getColumns().add(column("Gender", Person::genderProperty));
table.getColumns().add(column("Birthday", Person::birthdayProperty));
table.getColumns().add(column("Age", Person::ageProperty));
table.getColumns().add(column("Status", Person::statusProperty));
ComboBox<Person.Gender> genderFilterCombo = new ComboBox<>();
genderFilterCombo.getItems().addAll(Person.Gender.values());
CheckComboBox<Person.Gender> genderFilterCheckCombo= new CheckComboBox<>();
genderFilterCheckCombo.getItems().addAll(Person.Gender.values());
CheckComboBox<Person.Status> statusFilterCheckCombo= new CheckComboBox<>();
statusFilterCheckCombo.getItems().addAll(Person.Status.values());
TextField nameFilterField = new TextField();
TextField agefromFilterField = new TextField();
TextField ageuntilFilterField = new TextField();
DatePicker datefromFilterField = new DatePicker();
DatePicker dateuntilFilterField = new DatePicker();
Label totalperson = new Label();
Label totalvip = new Label();
Label totaloldperson = new Label();
Label totalyoungperson = new Label();
nameFilterField.setPromptText("Name");
agefromFilterField.setPromptText("Age from");
ageuntilFilterField.setPromptText("Age until");
datefromFilterField.setPromptText("Birthday from");
dateuntilFilterField.setPromptText("Birthday until");
ObjectProperty<Predicate<Person>> nameFilter = new SimpleObjectProperty<>();
ObjectProperty<Predicate<Person>> genderFilter = new SimpleObjectProperty<>();
ObjectProperty<Predicate<Person>> gender2Filter = new SimpleObjectProperty<>();
ObjectProperty<Predicate<Person>> datefromFilter = new SimpleObjectProperty<>();
ObjectProperty<Predicate<Person>> dateuntilFilter = new SimpleObjectProperty<>();
ObjectProperty<Predicate<Person>> agefromFilter = new SimpleObjectProperty<>();
ObjectProperty<Predicate<Person>> ageuntilFilter = new SimpleObjectProperty<>();
ObjectProperty<Predicate<Person>> statusFilter = new SimpleObjectProperty<>();
nameFilter.bind(Bindings.createObjectBinding(() ->
person -> person.getName().toLowerCase().contains(nameFilterField.getText().toLowerCase()),
nameFilterField.textProperty()));
genderFilter.bind(Bindings.createObjectBinding(() ->
person -> genderFilterCombo.getValue() == null || genderFilterCombo.getValue() == person.getGender(),
genderFilterCombo.valueProperty()));
gender2Filter.bind(Bindings.createObjectBinding(() ->
genderFilterCheckCombo.getCheckModel().getCheckedItems().isEmpty() ? person-> true : person->
genderFilterCheckCombo.getCheckModel().getCheckedItems().contains(person.getGender()),
genderFilterCheckCombo.getCheckModel().getCheckedItems()));
datefromFilter.bind(Bindings.createObjectBinding(() ->
person -> datefromFilterField.getValue() == null || datefromFilterField.getValue().isBefore(person.getBirthday())
|| datefromFilterField.getValue().isEqual(person.getBirthday()),
datefromFilterField.valueProperty()));
dateuntilFilter.bind(Bindings.createObjectBinding(() ->
person -> dateuntilFilterField.getValue() == null || dateuntilFilterField.getValue().isAfter(person.getBirthday())
|| dateuntilFilterField.getValue().isEqual(person.getBirthday()),
dateuntilFilterField.valueProperty()));
agefromFilter.bind(Bindings.createObjectBinding(() ->
person -> agefromFilterField.getText().isEmpty() || Integer.parseInt(agefromFilterField.getText()) <= person.getAge(),
agefromFilterField.textProperty()));
ageuntilFilter.bind(Bindings.createObjectBinding(() ->
person -> ageuntilFilterField.getText().isEmpty() || Integer.parseInt(ageuntilFilterField.getText()) >= person.getAge(),
ageuntilFilterField.textProperty()));
statusFilter.bind(Bindings.createObjectBinding(() ->
statusFilterCheckCombo.getCheckModel().getCheckedItems().isEmpty() ? person-> true : person->
statusFilterCheckCombo.getCheckModel().getCheckedItems().contains(person.getStatus()),
statusFilterCheckCombo.getCheckModel().getCheckedItems()));
FilteredList<Person> filteredItems = new FilteredList<>(FXCollections.observableList(createData()));
SortedList<Person> sortedData = new SortedList<>(filteredItems);
sortedData.comparatorProperty().bind(table.comparatorProperty());
table.setItems(sortedData);
filteredItems.predicateProperty().bind(Bindings.createObjectBinding(
() -> nameFilter.get().and(genderFilter.get().and(gender2Filter.get().and(datefromFilter.get().and(dateuntilFilter.get().
and(agefromFilter.get().and(ageuntilFilter.get().and(statusFilter.get()))))))),
nameFilter, genderFilter, gender2Filter, datefromFilter, dateuntilFilter, agefromFilter, ageuntilFilter, statusFilter));
Button clear = new Button("Clear Filters");
clear.setOnAction(e -> {
/*for (TablePosition<Person, ?> pos : table.getSelectionModel().getSelectedCells()) {
TableColumn<Person, ?> column = pos.getTableColumn();
ObservableValue<?> obs = column.getCellObservableValue(pos.getRow());
Object value = obs.getValue();
System.out.println(value);
// process value...
}*/
nameFilterField.clear();
datefromFilterField.setValue(null);
dateuntilFilterField.setValue(null);
//Here////////////////////////////////////////////////////////////
int tp = table.getItems().size();
totalperson.setText(tp + " " + "persons are found!");
totalvip.setText("x VIP found!");
totalyoungperson.setText("x are under or equal 25!");
totaloldperson.setText("x are over 25!");
});
FlowPane filters = new FlowPane( nameFilterField, genderFilterCombo, datefromFilterField, dateuntilFilterField, genderFilterCheckCombo, agefromFilterField,
ageuntilFilterField, statusFilterCheckCombo, clear);
HBox labels = new HBox(40, totalperson, totalvip, totalyoungperson, totaloldperson);
filters.setPadding(new Insets(5));
labels.setPadding(new Insets(5));
BorderPane root = new BorderPane(table, filters, null, labels, null);
Scene scene = new Scene(root, 800, 600);
primaryStage.setScene(scene);
primaryStage.show();
}
private List<Person> createData() {
return Arrays.asList(
new Person("Jacob Smith", "jacob.smith@example.com", Person.Gender.MALE, LocalDate.parse("2018-08-25"),25, Person.Status.NONVIP),
new Person("Jacob Smith", "jacob.smith@example.com", Person.Gender.MALE, LocalDate.parse("2018-08-26"),24, Person.Status.VIP),
new Person("Jacob Smith", "jacob.smith@example.com", Person.Gender.FEMALE, LocalDate.parse("2018-08-26"),23, Person.Status.VIP),
new Person("Jacob Smith", "jacob.smith@example.com", Person.Gender.MALE, LocalDate.parse("2018-08-25"),25, Person.Status.NONVIP),
new Person("Isabella Johnson", "isabella.johnson@example.com", Person.Gender.FEMALE, LocalDate.parse("2018-08-21"),28, Person.Status.VIP),
new Person("Ethan Williams", "ethan.williams@example.com", Person.Gender.MALE, LocalDate.parse("2018-08-21"),30, Person.Status.VIP),
new Person("Emma Jones", "emma.jones@example.com", Person.Gender.FEMALE, LocalDate.parse("2018-08-29"),18, Person.Status.NONVIP),
new Person("Michael Brown", "michael.brown@example.com", Person.Gender.MALE, LocalDate.parse("2018-08-05"),15, Person.Status.NONVIP)
);
}
public static <S,T> TableColumn<S,T> column(String title, Function<S, ObservableValue<T>> property) {
TableColumn<S,T> col = new TableColumn<>(title);
col.setCellValueFactory(cellData -> property.apply(cellData.getValue()));
return col ;
}
public static class Person {
// List<Gender> abc = Arrays.asList(Person.Gender.values());
public enum Gender {MALE, FEMALE}
public enum Status {VIP, NONVIP}
private final StringProperty name = new SimpleStringProperty();
private final StringProperty email = new SimpleStringProperty() ;
private final ObjectProperty<Gender> gender = new SimpleObjectProperty<>();
private final ObjectProperty<LocalDate> birthday = new SimpleObjectProperty<>();
private final IntegerProperty age = new SimpleIntegerProperty();
private final ObjectProperty<Status> status = new SimpleObjectProperty<>();
public Person(String name, String email, Gender gender, LocalDate birthday, Integer age, Status status) {
setName(name);
setEmail(email);
setGender(gender);
setBirthday(birthday);
setAge(age);
setStatus(status);
}
public ObjectProperty<Status> statusProperty() { return status; }
public Status getStatus() { return this.statusProperty().get(); }
public void setStatus(Status status) { this.statusProperty().set(status); }
public IntegerProperty ageProperty() { return age; }
public final int getAge() { return this.ageProperty().get(); }
public final void setAge(final Integer age) {this.ageProperty().set(age); }
public final ObjectProperty<LocalDate> birthdayProperty(){
return this.birthday;
}
public final LocalDate getBirthday() {
return this.birthdayProperty().get();
}
public final void setBirthday(final LocalDate birthday) {
this.birthdayProperty().set(birthday);
}
public final StringProperty emailProperty() {
return this.email;
}
public final String getEmail() {
return this.emailProperty().get();
}
public final void setEmail(final String email) {
this.emailProperty().set(email);
}
public final ObjectProperty<Gender> genderProperty() {
return this.gender;
}
public final Gender getGender() {
return this.genderProperty().get();
}
public final void setGender(final Gender gender) {
this.genderProperty().set(gender);
}
public final StringProperty nameProperty() {
return this.name;
}
public final String getName() { return this.nameProperty().get(); }
public final void setName(final String name) {
this.nameProperty().set(name);
}
}
public static void main(String[] args) {
launch(args);
}
}
答案 0 :(得分：0)
使用两种类型的构造，可以使用纯JavaFX绑定解决您的问题：
<some-label>.textProperty().bind(Bindings.size(<observable-list>).asString(<some template>));
我试图实现一个最小示例（MCVE），以显示表中所有项目和已过滤项目的数量。我没有使用您的设置，因为我认为它对于MCVE来说太复杂了。我希望该代码可以自我解释，请随时询问是否有混淆或在将其移植到代码时遇到问题。
此应用程序具有一个最小的UI，该UI显示一个表，该表默认具有两个条目和两个标签，一个标签在顶部（显示所有项目的数量），一个标签在底部（显示通过过滤器的项目数量）。由于未显示未通过过滤器的项目，因此无法对其进行编辑以再次通过过滤器，因此，一旦选中复选框或更改名称（取决于活动过滤器），就必须重新启动应用程序。
该示例是一个完整的JavaFX应用程序，您应该能够直接从命令行或使用任何IDE（例如Eclipse：Run As-> Java Application）运行它：
public class FxApp extends Application {
private ObservableList<PersonController> all =
FXCollections.observableArrayList(PersonController::extract);
private FilteredList<PersonController> filtered = new FilteredList<>(all);
private TableView<PersonController> table = new TableView<>();
private TableColumn<PersonController, String> nameColumn = new TableColumn<>("Name");
private TableColumn<PersonController, Boolean> checkColumn = new TableColumn<>("Check");
private Label allLabel = new Label(), filteredLabel = new Label();
@Override
public void start(Stage stage) throws Exception {
// Setup items
all.add(new PersonController("John Doe"));
all.add(new PersonController("Jane Doe"));
// Setup UI
table.setEditable(true);
table.getColumns().addAll(Arrays.asList(nameColumn, checkColumn));
nameColumn.setCellFactory(TextFieldTableCell.forTableColumn());
nameColumn.setCellValueFactory(features -> features.getValue().nameProperty);
checkColumn.setCellFactory(CheckBoxTableCell.forTableColumn(checkColumn));
checkColumn.setCellValueFactory(features -> features.getValue().checkProperty);
allLabel.textProperty().bind(Bindings.size(all).asString("All items: %s"));
filteredLabel.textProperty().bind(Bindings.size(filtered).asString("Filtered Items: %s"));
// You may need to add dependencies of your filter here
filtered.predicateProperty().bind(Bindings.createObjectBinding(this::buildFilter));
table.setItems(filtered);
BorderPane pane = new BorderPane();
pane.setCenter(table);
pane.setTop(allLabel);
pane.setBottom(filteredLabel);
Scene scene = new Scene(pane);
stage.setScene(scene);
stage.show();
}
private Predicate<PersonController> buildFilter() {
return person -> person.checkProperty.not().get();
// OR
// return person -> person.nameProperty.get().endsWith("Doe");
// OR
// some complex filter using other inputs
}
private static class PersonController {
private StringProperty nameProperty = new SimpleStringProperty();
private BooleanProperty checkProperty = new SimpleBooleanProperty();
public PersonController(String name) {
nameProperty.set(name);
}
public Observable[] extract() {
return new Observable[] { nameProperty, checkProperty };
}
}
public static void main(String[] args) {
launch(args);
}
}
答案 1 :(得分：-1)
所以最后是答案。感谢 @James_D 在here
上发表的帖子ObservableList<Person> items = table.getItems();
// initialize counts (only needed once, and only if items is non-empty):
int vip = 0 ;
int total = table.getItems().size();
for (Person item : items) {
if (Person.Status.VIP.equals(item.getStatus())) vip++ ;
if (Person.Status.NONVIP.equals(item.getStatus())) nonvip++ ;
}
IntegerProperty vipCount = new SimpleIntegerProperty(vip);
IntegerProperty totalCount = new SimpleIntegerProperty(total);
totalvip.textProperty().bind(vipCount.asString("VIP: %s"));
totalperson.textProperty().bind(totalCount.asString("Total persons: %s"));
items.addListener((
ListChangeListener.Change<? extends Person> c) -> {
while (c.next()) {
if (c.wasAdded()) {
for (Person item : c.getAddedSubList()) {
totalCount.set(totalCount.get() + 1);
if (Person.Status.VIP.equals(item.getStatus())) vipCount.set(vipCount.get() + 1) ;
}
}
if (c.wasRemoved()) {
for (Person item : c.getRemoved()) {
totalCount.set(totalCount.get() - 1);
item.statusProperty().removeListener(listener);
if (Person.Status.VIP.equals(item.getStatus())) vipCount.set(vipCount.get() - 1) ;
if(vipCount.get() < 0 ) vipCount.set(0); //prevent negative
}
}
}
});