JavaFX中tableview单元格中的ComboBox

时间:2016-02-01 13:11:53

标签: java javafx combobox

我正在尝试向Combo Box添加Table View

基本上我有一个名为TableViewTest的类,它存储了一个名称和一个描述,我可以在Table View中显示这些名称和描述,但我想要做的是添加第三列,每个单元都有a Combo Box,以便用户可以从每个人的多个选项中选择一个。

到目前为止,我创建了一个ObservableList类型String,其中包含一些值,并将它们添加到ComboBox对象中。有没有人知道我将这个Combo Box添加到表中的方法?

另外请记住,这段代码非常粗糙,我只想尝试一些工作,我将在以后重构代码。

ObservableList<TableViewTest> products = FXCollections.observableArrayList();

    for(int i = 0; i < b.length; i++){

        // random String values
        products.add(new TableViewTest(b[i], a[i]));
    }

ObservableList<String> options = FXCollections.observableArrayList(
                                "1",
                                "2",
                                "3"
                                );
final ComboBox comboBox = new ComboBox(options);

TableColumn<TableViewTest, String> nameColumn = new TableColumn<> ("Name");
nameColumn.setMinWidth(200);
nameColumn.setCellValueFactory(new PropertyValueFactory<TableViewTest, String>("name"));

                //price Column
                //Stock Column
TableColumn<TableViewTest, String> StockColumn = new TableColumn<> ("Stock");
StockColumn.setMinWidth(150);
StockColumn.setCellValueFactory(new PropertyValueFactory<TableViewTest, String>("description"));


TableColumn<Object,ComboBox> PriceColumn;
PriceColumn = new TableColumn<>("Source");
PriceColumn.setMinWidth(150);
   //PriceColumn.setCellValueFactory(new PropertyValueFactory<>
   //(options));

   //PriceColumn.setCellFactory(ComboBoxTableCell.forTableColumn(new 
   //DefaultStringConverter(), options));


   //PriceColumn.setCellFactory(ComboBoxTableCell.forTableColumn( 
   //comboBox));

TableView<TableViewTest> table = new TableView<>();

table.setItems(products);
table.getColumns().addAll(nameColumn, StockColumn, PriceColumn);

2 个答案:

答案 0 :(得分:3)

表列的类型始终是第一个类型参数中每行中项目的类型(即与用于表视图的类型相同),以及每个类型的(当前)值的类型列中的单元格用于第二个参数。因此,如果您的表格视图的类型为TableViewTest,并且您的组合框正在选择String,那么您应该

TableColumn<TableViewTest, String> priceColumn ;

单元格值工厂仍应映射到TableViewTest类中的属性,即假设您有

public class TableViewTest {

    // ...

    public StringProperty priceProperty() {
        // ...
    }

    // ...
}

然后你可以做

priceColumn.setCellValueFactory(new PropertyValueFactory<>("price""));

或(更好)

priceColumn.setCellValueFactory(cellData -> cellData.getValue().priceProperty());

然后你可以做

priceColumn.setCellFactory(ComboBoxTableCell.forTableColumn(options));

这是一个SSCCE:

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.scene.Scene;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.ComboBoxTableCell;
import javafx.scene.control.cell.TextFieldTableCell;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class TableWithComboBoxExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        TableView<Contact> contactTable = new TableView<>();
        contactTable.setEditable(true);

        TableColumn<Contact, String> nameCol = new TableColumn<>("Name");
        nameCol.setCellValueFactory(cellData -> cellData.getValue().nameProperty());
        nameCol.setCellFactory(TextFieldTableCell.forTableColumn());
        contactTable.getColumns().add(nameCol);


        TableColumn<Contact, String> categoryCol = new TableColumn<>("Category");
        categoryCol.setCellValueFactory(cellData -> cellData.getValue().categoryProperty());

        categoryCol.setCellFactory(ComboBoxTableCell.forTableColumn("Friends", "Family", "Work Contacts"));

        contactTable.getColumns().add(categoryCol);

        contactTable.getItems().addAll(
            new Contact("Bill Gates", "Work Contacts"),
            new Contact("Barack Obama", "Friends"),
            new Contact("Tim Cook", "Work Contacts")
        );

        Scene scene = new Scene(new BorderPane(contactTable), 600, 600);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static class Contact {
        private final StringProperty name = new SimpleStringProperty();
        private final StringProperty category = new SimpleStringProperty();

        public Contact(String name, String category) {
            setName(name);
            setCategory(category);
        }

        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 final StringProperty categoryProperty() {
            return this.category;
        }


        public final String getCategory() {
            return this.categoryProperty().get();
        }


        public final void setCategory(final String category) {
            this.categoryProperty().set(category);
        }

    }

    public static void main(String[] args) {
        launch(args);
    }
}

答案 1 :(得分:3)

James_D的答案很有效,但要求用户点击该项目以查看ComboBox。如果您希望在列中显示ComboBox es,则始终显示,您必须使用自定义cellFactory

实施例

public class TableViewTest {

    ...

    private final StringProperty option = new SimpleStringProperty();

    public String getOption() {
        return option.get();
    }

    public void setOption(String value) {
        option.set(value);
    }

    public StringProperty optionProperty() {
        return option;
    }

}
    TableColumn<TableViewTest, StringProperty> column = new TableColumn<>("option");
    column.setCellValueFactory(i -> {
        final StringProperty value = i.getValue().optionProperty();
        // binding to constant value
        return Bindings.createObjectBinding(() -> value);
    });

    column.setCellFactory(col -> {
        TableCell<TableViewTest, StringProperty> c = new TableCell<>();
        final ComboBox<String> comboBox = new ComboBox<>(options);
        c.itemProperty().addListener((observable, oldValue, newValue) -> {
            if (oldValue != null) {
                comboBox.valueProperty().unbindBidirectional(oldValue);
            }
            if (newValue != null) {
                comboBox.valueProperty().bindBidirectional(newValue);
            }
        });
        c.graphicProperty().bind(Bindings.when(c.emptyProperty()).then((Node) null).otherwise(comboBox));
        return c;
    });