JavaFX TableView: adding individual values in specific column
I cant seem to find a solution for this and new to java/ javafx:
I have a 3 column tableview , last column is a price column. I would like to display a running total of the price column whenever a row is added or deleted from the tableview.
TableView is populated from an ObservableList which holds a 3 field object per row. String id,String product, Double price.........it is the price I would like to keep a running total of in a separate textField
由于tableview的项目是ObservableList，因此您可以跟踪ListChangeListener，并更新计算出的总价格：
public class Sample extends Application
{
@Override
public void start( Stage primaryStage )
{
// items set to tableview
ObservableList<Product> products = FXCollections.observableArrayList();
DoubleProperty totalProperty = new SimpleDoubleProperty( 0 );
products.addListener(( ListChangeListener.Change<? extends Product> change ) ->
{
while ( change.next() )
{
if ( change.wasAdded() )
{
for ( Product p : change.getAddedSubList() )
{
totalProperty.set( totalProperty.get() + p.getPrice() );
}
}
else if ( change.wasRemoved() )
{
for ( Product p : change.getRemoved() )
{
totalProperty.set( totalProperty.get() - p.getPrice() );
}
}
}
});
TextField textField = new TextField();
textField.textProperty().bind( totalProperty.asString() );
Random random = new Random();
Button btnAdd = new Button( "Add product" );
btnAdd.setOnAction( ( ActionEvent event ) ->
{
products.add( new Product( "new", ( double ) random.nextInt( 100 ) ) );
} );
Button btnRemove = new Button( "Remove product" );
btnRemove.setOnAction( ( ActionEvent event ) ->
{
if ( products.size() > 0 )
{
products.remove( random.nextInt( products.size() ) );
}
} );
VBox root = new VBox();
root.getChildren().addAll( textField, btnAdd, btnRemove );
Scene scene = new Scene( root, 300, 250 );
primaryStage.setScene( scene );
primaryStage.show();
}
public static class Product
{
String name;
Double price;
public Product( String name, Double price )
{
this.name = name;
this.price = price;
}
public String getName()
{
return name;
}
public void setName( String name )
{
this.name = name;
}
public Double getPrice()
{
return price;
}
public void setPrice( Double price )
{
this.price = price;
}
}
public static void main( String[] args )
{
launch( args );
}
}