How to create a tableview for this?

Hey, I was glued to this party for a long time and not able to find the answers, maybe I can get help from you guys.

See I have a scenario where I have different 'items', which each will belong to a predefined category. These elements have different types and names (depends on the category), in turn, each of these types have a price.

For example if I Item1 (water bottle), belongs to category 1 and there are different types: 200ml, 500 ml, 1000ml with labels of 10,20,30 price respectively.

Similarly, I have Item2 (box of butter), belongs to Category2 and there are different types: 100 g, 200 g with labels of 15 and 25 price respectively.

Now I want the data to appear on an editable table, when I press a button in the category, all items in the category (with the same type) must be included, with the sections divided into:

The pressing of category 1

NAME | PRICE |
| 200ml | 500ml | 1000ml |
| |
Water bottle | 10. 20. 30.
. . . .
. . . .

The pressing of category 2

NAME | PRICE |
| 100 GM | 200ml |
| |
Butter box | 15. 25.

So, I want a dyanamic table which can have dynamic nested columns.

I was trying to make a table of the class

public class ItemVO()
{
String itemName;
The list type < ItemTypeVO >;
}

and my ItemTypeVO has the following attributes:

public class ItemTypeVO()
{
String typeName;
Full price;
}

But not able to get anywhere with it.

A lot of places I found dynamic columns with attributes like this:

public class ItemVO()
{
String itemName;
Type ItemTypeVO;
}

But it is not my job. I think so.

Can someone help me with this change can I do in my class, so that I can make a table and provide me with a code as well.

Thanks in advance.

I don't really know what you're trying to do in this Test class.

I mocked this upward with the object model, I proposed and the mock object data access codes hard just a few items and it works fine.

Type.Java

package itemtable;

public class Type {

  private final String name ;

  public Type(String name) {
    this.name = name ;
  }

  public String getName() {
    return name ;
  }
}

Category.Java

package itemtable;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class Category {

  private final List types ;
  private final String name ;

  public Category(String name, List types) {
    this.name = name ;
    this.types = new ArrayList();
    this.types.addAll(types);
  }

  public List getTypes() {
    return Collections.unmodifiableList(types);
  }

  public String getName() {
    return name ;
  }

  @Override
  public String toString() {
    return name ;
  }
}

Item.Java

package itemtable;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javafx.beans.property.DoubleProperty;
import javafx.beans.property.ReadOnlyObjectProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;

public class Item {
  private final StringProperty name ;
  private final ReadOnlyObjectProperty category ;
  private final Map prices ;

  public Item(String name, Category category, Map prices) {
    this.name = new SimpleStringProperty(name);
    this.category = new SimpleObjectProperty(category);
    this.prices = new HashMap();
    for (Type type : prices.keySet()) {
      validateType(type);
      this.prices.put(type, new SimpleDoubleProperty(prices.get(type)));
    }
  }

  public String getName() {
    return name.get();
  }
  public Category getCategory() {
    return category.get();
  }
  public double getPrice(Type type) {
    validateType(type);
    return prices.get(type).get();
  }
  public void setName(String name) {
    this.name.set(name);
  }
  public void setPrice(Type type, double price) {
    validateType(type);
    prices.get(type).set(price);
  }
  public StringProperty nameProperty() {
    return name ;
  }
  public ReadOnlyObjectProperty categoryProperty() {
    return category ;
  }
  public DoubleProperty priceProperty(Type type) {
    return prices.get(type);
  }

  private void validateType(Type type) {
    final List allowedTypes = category.get().getTypes();
    if (! allowedTypes.contains(type)) {
      throw new IllegalArgumentException("Cannot set a price for "+type.getName()+": it is not a type for the category "+category.getName());
    }
  }
}

DAO.java

package itemtable;

import java.util.List;

public interface DAO {
  public List getCategories();
  public List getItemsByCategory(Category category);
}

MockDAO.java

package itemtable;

import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MockDAO implements DAO {

  private final List categories ;
  private final Map> itemLookup ;

  public MockDAO() {
    final Type spreadType100g = new Type("100g");
    final Type spreadType200g = new Type("200g");
    final Type drinkType200ml = new Type("200ml");
    final Type drinkType500ml = new Type("500ml");
    final Type drinkType1000ml = new Type("1000ml");
    final Category spreads = new Category(
        "Spreads",
        Arrays.asList(spreadType100g, spreadType200g)
    );
    final Category drinks = new Category(
        "Drinks",
        Arrays.asList(drinkType200ml, drinkType500ml, drinkType1000ml)
    );
    final Map waterPrices = new HashMap();
    waterPrices.put(drinkType200ml, 10.0);
    waterPrices.put(drinkType500ml, 20.0);
    waterPrices.put(drinkType1000ml, 30.0);
    final Map pepsiPrices = new HashMap();
    pepsiPrices.put(drinkType200ml, 25.0);
    pepsiPrices.put(drinkType500ml, 45.0);
    pepsiPrices.put(drinkType1000ml, 75.0);
    final Map butterPrices = new HashMap();
    butterPrices.put(spreadType100g, 15.0);
    butterPrices.put(spreadType200g, 25.0);
    final Map margarinePrices = new HashMap();
    margarinePrices.put(spreadType100g, 12.0);
    margarinePrices.put(spreadType200g, 20.0);
    final Map mayoPrices = new HashMap();
    mayoPrices.put(spreadType100g, 20.0);
    mayoPrices.put(spreadType200g, 35.0);
    final Item water = new Item("Water", drinks, waterPrices);
    final Item pepsi = new Item("Pepsi", drinks, pepsiPrices);
    final Item butter = new Item("Butter", spreads, butterPrices);
    final Item margarine = new Item("Margarine", spreads, margarinePrices);
    final Item mayonnaise = new Item("Mayonnaise", spreads, mayoPrices);

    this.categories = Arrays.asList(drinks, spreads);
    this.itemLookup = new HashMap>();
    itemLookup.put(drinks, Arrays.asList(water, pepsi));
    itemLookup.put(spreads, Arrays.asList(butter, margarine, mayonnaise));
  }

  @Override
  public List getCategories() {
    return categories ;
  }

  @Override
  public List getItemsByCategory(Category category) {
    return itemLookup.get(category);
  }

}

ItemTable.java

package itemtable;

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.Scene;
import javafx.scene.control.ChoiceBox;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableColumn.CellDataFeatures;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javafx.util.Callback;

public class ItemTable extends Application {

  @Override
  public void start(Stage primaryStage) {
    final DAO dao = new MockDAO();
    final ChoiceBox choiceBox = new ChoiceBox();
    choiceBox.getItems().setAll(dao.getCategories());

    final TableView table = new TableView();
    final TableColumn nameCol = new TableColumn("Name");
    nameCol.setCellValueFactory(new PropertyValueFactory("name"));
    final TableColumn priceCol = new TableColumn("Price");
    table.getColumns().addAll(nameCol, priceCol);

    choiceBox.getSelectionModel().selectedItemProperty()
        .addListener(new ChangeListener() {
          @Override
          public void changed(ObservableValue observable, Category oldValue, Category newValue) {
            table.getItems().clear();
            priceCol.getColumns().clear();
            for (final Type type : newValue.getTypes()) {
              final TableColumn col = new TableColumn(type.getName());
              col.setCellValueFactory(new Callback, ObservableValue>() {
                @Override
                public ObservableValue call(CellDataFeatures cellData) {
                  Item item = cellData.getValue();
                  if (item == null) {
                    return null;
                  } else {
                    return item.priceProperty(type);
                  }
                }
              });
              priceCol.getColumns().add(col);
            }
            table.getItems().setAll(dao.getItemsByCategory(newValue));
          }
        });

    BorderPane root = new BorderPane();
    root.setTop(choiceBox);
    root.setCenter(table);

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

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

Tags: Java

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