大家。
我有一个像这样的javaFx tableView：
----------------------------------------- | Name | Date | actions | ----------------------------------------- | jack |23-06-2016 | B1 B2 B3 | ----------------------------------------- | Jane |12-02-2017 | B1 B2 B3 | ----------------------------------------- | Mickel |22-05-2017 | B1 B2 B3 | -----------------------------------------
使用 CustomCellTable 呈现actions列。它包含三个按钮（B1，B2和B3）
我希望只有相应的日期是表格中的最大值才能启用B3按钮。
在上面的例子中，应该启用最后一行的B3按钮，其他行不应该
提前感谢您的帮助。
答案 0 :(得分：2)
假设您有一个类似于
的模型类public class Person {
// ...
public StringProperty nameProperty() {
return name ;
}
public ObjetProperty<LocalDate> dateProperty() {
return date ;
}
public LocalDate getDate() {
return dateProperty().get();
}
// ...
}
如果您使用extractor创建表格的项目列表：
ObservableList<Person> tableData = FXCollections.observableArrayList(p -> new Observable[] {p.dateProperty()});
tableData.addAll(...);
table.setItems(tableData);
然后你可以做
ObjectBinding<Person> personWithLatestDate = Bindings.createObjectBinding(() ->
tableData.stream().max(Comparator.comparing(Person::getDate)).orElse(null),
tableData);
并且您的操作列可能如下所示：
TableColumn<Person, Person> actionsColumn = new TableColumn<>("Actions");
actionsColumn.setCellValueFactory(cellData -> new SimpleObjectProperty<>(cellData.getValue()));
actionsColumn.setCellFactory(tc -> new TableCell<Person, Person>() {
// ...
Button b3 = new Button(...) ;
HBox buttons = new HBox(5, b1, b2, b3);
// ...
{
b3.disableProperty().bind(itemProperty().isNotEqualTo(personWithLatestDate));
}
@Override
protected void updateItem(Person person, boolean empty) {
super.updateItem(person, empty);
setGraphic(empty ? null : buttons);
}
});
这是一个SSCCE：
import java.time.LocalDate;
import java.util.Comparator;
import javafx.application.Application;
import javafx.beans.Observable;
import javafx.beans.binding.Bindings;
import javafx.beans.binding.ObjectBinding;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.DatePicker;
import javafx.scene.control.Label;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.stage.Modality;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import javafx.stage.Window;
public class TableCelDisableButton extends Application {
private ObservableList<Person> tableData;
@Override
public void start(Stage primaryStage) {
TableView<Person> table = new TableView<>();
tableData = FXCollections.observableArrayList(p -> new Observable[] {p.dateProperty()});
table.setItems(tableData);
ObjectBinding<Person> personWithLatestDate = Bindings.createObjectBinding(() ->
tableData.stream().max(Comparator.comparing(Person::getDate)).orElse(null),
tableData);
TableColumn<Person, String> nameCol = new TableColumn<>("Name");
nameCol.setCellValueFactory(cellData -> cellData.getValue().nameProperty());
TableColumn<Person, LocalDate> dateCol = new TableColumn<>("Date");
dateCol.setCellValueFactory(cellData -> cellData.getValue().dateProperty());
TableColumn<Person, Person> actionsCol = new TableColumn<>("Actions");
actionsCol.setCellValueFactory(cellData -> new SimpleObjectProperty<>(cellData.getValue()));
actionsCol.setCellFactory(tc -> new TableCell<Person, Person>() {
Button edit = new Button("Edit");
Button button = new Button("Click");
HBox buttons = new HBox(5, edit, button);
{
edit.setOnAction(e -> edit(getItem(), primaryStage, false));
button.disableProperty().bind(itemProperty().isNotEqualTo(personWithLatestDate));
}
@Override
protected void updateItem(Person person, boolean empty) {
super.updateItem(person, empty);
setGraphic(empty ? null : buttons);
}
});
table.getColumns().add(nameCol);
table.getColumns().add(dateCol);
table.getColumns().add(actionsCol);
table.getItems().add(new Person("Jack", LocalDate.of(2016, 6, 23)));
table.getItems().add(new Person("Jane", LocalDate.of(2017, 2, 12)));
table.getItems().add(new Person("Mikel", LocalDate.of(2017, 5, 22)));
Button add = new Button("Add");
add.setOnAction(e -> edit(new Person("", LocalDate.now()), primaryStage, true));
Button delete = new Button("Delete");
delete.disableProperty().bind(table.getSelectionModel().selectedItemProperty().isNull());
delete.setOnAction(e -> tableData.remove(table.getSelectionModel().getSelectedIndex()));
HBox buttons = new HBox(5, add, delete);
buttons.setPadding(new Insets(5));
buttons.setAlignment(Pos.CENTER);
Scene scene = new Scene(new BorderPane(table, null, null, buttons, null), 600, 600);
primaryStage.setScene(scene);
primaryStage.show();
}
private void edit(Person person, Window primaryStage, boolean addOnCommit) {
GridPane editor = new GridPane();
ColumnConstraints leftCol = new ColumnConstraints();
leftCol.setHgrow(Priority.NEVER);
leftCol.setHalignment(HPos.RIGHT);
ColumnConstraints rightCol = new ColumnConstraints();
rightCol.setHgrow(Priority.SOMETIMES);
rightCol.setHalignment(HPos.LEFT);
editor.getColumnConstraints().addAll(leftCol, rightCol);
editor.setHgap(5);
editor.setVgap(8);
editor.setPadding(new Insets(10));
editor.add(new Label("Name:"), 0, 0);
editor.add(new Label("Date"), 0, 1);
TextField name = new TextField(person.getName());
editor.add(name, 1, 0);
DatePicker date = new DatePicker(person.getDate());
editor.add(date, 1, 1);
Button ok = new Button("OK");
Button cancel = new Button("Cancel");
HBox buttons = new HBox(5, ok, cancel);
buttons.setAlignment(Pos.CENTER);
editor.add(buttons, 0, 2, 2, 1);
Scene scene = new Scene(editor);
Stage editDialog = new Stage();
editDialog.setScene(scene);
editDialog.initModality(Modality.APPLICATION_MODAL);
editDialog.initOwner(primaryStage);
editDialog.initStyle(StageStyle.UNDECORATED);
editDialog.sizeToScene();
ok.setOnAction(e -> {
person.setName(name.getText());
person.setDate(date.getValue());
if (addOnCommit) {
tableData.add(person);
}
editDialog.hide();
});
cancel.setOnAction(e -> editDialog.hide());
editDialog.show();
}
public static class Person {
private final StringProperty name = new SimpleStringProperty();
private final ObjectProperty<LocalDate> date = new SimpleObjectProperty<>();
public Person(String name, LocalDate date) {
setName(name);
setDate(date);
}
public final StringProperty nameProperty() {
return this.name;
}
public final java.lang.String getName() {
return this.nameProperty().get();
}
public final void setName(final java.lang.String name) {
this.nameProperty().set(name);
}
public final ObjectProperty<LocalDate> dateProperty() {
return this.date;
}
public final java.time.LocalDate getDate() {
return this.dateProperty().get();
}
public final void setDate(final java.time.LocalDate date) {
this.dateProperty().set(date);
}
}
public static void main(String[] args) {
launch(args);
}
}