Cell TableView coloring on updates - realizing if sort happened

I'm doing has highlighted cells (in color) in a TableView whenever they are updated. My solution is based on the implementation of cell factories and use Animation (mounting) control cell background opacity - it works very well: whenever a cell value is updated, the background changes color, then fades away well.

The problem is, that if the table is sorted by clicking a column header, the underlying list is changed (of course), and the GUI level, it is also understood as a change and depending on the circumstances by cell (I flash a cell if its new value is different from the previous), several cells show an update unnecessarily (flashing).

I wonder how I could eliminate if a cell has been updated due to a 'real' update (an element has been updated) of the case when the list sort column and/or the order has been changed? I thought to catch the event of sorting (by adding an InvalidationListener to the sort order list) and ignore the updates, while it is underway, but I can't really know when it's over. I bet at the GUI level, there is no way to determine the reason, so I need a deeper understanding...

Thanks for the tips.

Register a listener for change with the appropriate property to change the highlight color for the cell according to the case. You need to do a bit of work to make sure that the listener is registered and non-registered as appropriate that the cell is reused for the different table elements: the trick is to use

Bindings.Select (tableRowProperty (), "point")

to get an observable of the current value of the line.

Update:

Well, the previous example did not work. For reasons I can't understand, after sorting (or scroll, in fact), the evil cell became the property change notifications.

So here's another strategy: keep track of the last known value of the cell line, and don't make the highlight is still called same rank value after the update. I prefer kind of the strategy described above, but I couldn't make it work.

import java.text.NumberFormat;
import java.util.Arrays;
import java.util.List;
import java.util.Random;

import javafx.animation.FadeTransition;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.ReadOnlyStringProperty;
import javafx.beans.property.ReadOnlyStringWrapper;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.util.Callback;
import javafx.util.Duration;

public class TableChangeHighlightExample extends Application {

 @Override
  public void start(Stage primaryStage) {
    final Random rng = new Random();
  final TableView table = new TableView<>();
  table.getItems().addAll(createData(rng));

  TableColumn symbolColumn = new TableColumn<>("Symbol");
  TableColumn priceColumn = new TableColumn<>("Price");
  symbolColumn.setCellValueFactory(new PropertyValueFactory("symbol"));
  priceColumn.setCellValueFactory(new PropertyValueFactory("price"));
  priceColumn.setCellFactory(new Callback, TableCell>() {
      @Override
      public TableCell call(TableColumn table) {
        return new StockPriceCell();
      }
  });
  table.getColumns().addAll(Arrays.asList(symbolColumn, priceColumn));

  Timeline changeStockPricesRandomly = new Timeline(new KeyFrame(Duration.seconds(2), new EventHandler() {
    @Override
    public void handle(ActionEvent event) {
      StockValue stockToChange = table.getItems().get(rng.nextInt(table.getItems().size()));
      double changeFactor = 0.9 + rng.nextInt(200) / 1000.0 ;
      double oldPrice = stockToChange.getPrice();
      double newPrice = oldPrice * changeFactor ;
//     System.out.println("Changing price for "+stockToChange+" to "+newPrice);
      stockToChange.setPrice(newPrice) ;
    }
  }));
  changeStockPricesRandomly.setCycleCount(Timeline.INDEFINITE);
  changeStockPricesRandomly.play();

  BorderPane root = new BorderPane();
  root.setCenter(table);
  primaryStage.setScene(new Scene(root, 300, 400));
  primaryStage.show();
  }

  private List createData(Random rng) {
    return Arrays.asList(
      new StockValue("ORCL", 20.0 + rng.nextInt(2000)/100.0),
      new StockValue("AAPL", 300.0 + rng.nextInt(20000)/100.0),
      new StockValue("GOOG", 500.0 + rng.nextInt(100000)/100.0),
      new StockValue("YHOO", 20.0 + rng.nextInt(2000)/100.0),
      new StockValue("FB", 20.0 + rng.nextInt(1000)/100.0)
    );
  }

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

  public static class StockPriceCell extends TableCell {
    private static final Color INCREASE_HIGHLIGHT_COLOR = Color.GREEN ;
    private static final Color DECREASE_HIGHLIGHT_COLOR = Color.RED ;
    private static final Duration HIGHLIGHT_TIME = Duration.millis(500);

    private static final NumberFormat formatter = NumberFormat.getCurrencyInstance();

    private final Label priceLabel ;
    private final Rectangle overlayRectangle ;
    private StockValue lastRowValue ;

    public StockPriceCell() {
      overlayRectangle = new Rectangle();
      overlayRectangle.setFill(Color.TRANSPARENT);
      overlayRectangle.widthProperty().bind(this.widthProperty().subtract(8));
      overlayRectangle.heightProperty().bind(this.heightProperty().subtract(8));
      overlayRectangle.setMouseTransparent(true);

      this.priceLabel = new Label();
      priceLabel.setMaxWidth(Double.POSITIVE_INFINITY);
      priceLabel.setAlignment(Pos.CENTER_RIGHT);
      StackPane pane = new StackPane();
      pane.getChildren().addAll(overlayRectangle, priceLabel);
      setGraphic(pane);
    }

    @Override
    protected void updateItem(Double price, boolean empty) {
      Double oldPrice = getItem();
      super.updateItem(price, empty);
      StockValue currentRowValue = null ;
      if (getTableRow()!=null) {
        currentRowValue = (StockValue) getTableRow().getItem();
      }
      if (empty) {
        priceLabel.setText(null);
      } else {
        priceLabel.setText(formatter.format(price));
        if (price != null && oldPrice != null && currentRowValue == lastRowValue) {
          if (price.doubleValue() > oldPrice.doubleValue()) {
            overlayRectangle.setFill(INCREASE_HIGHLIGHT_COLOR);
          } else if (price.doubleValue() < oldPrice.doubleValue()) {
            overlayRectangle.setFill(DECREASE_HIGHLIGHT_COLOR);
          }
          FadeTransition fade = new FadeTransition(HIGHLIGHT_TIME, overlayRectangle);
          fade.setFromValue(1);
          fade.setToValue(0);
          fade.play();
        }
      }
      lastRowValue = currentRowValue ;
    }
  }

 public static class StockValue {
    private final ReadOnlyStringWrapper symbol ;
    private final DoubleProperty price ;
    public StockValue(String symbol, double price) {
      this.symbol = new ReadOnlyStringWrapper(this, "symbol", symbol);
      this.price = new SimpleDoubleProperty(this, "price", price);
    }
    public final ReadOnlyStringProperty symbolProperty() {
      return symbol.getReadOnlyProperty();
    }
    public final String getSymbol() {
      return symbol.get();
    }
    public final DoubleProperty priceProperty() {
      return price ;
    }
    public final double getPrice() {
      return price.get();
    }
    public final void setPrice(double price) {
      this.price.set(price);
    }
    @Override
    public String toString() {
      return symbol.get() + " : " + price.get() ;
    }
  }
}

Post edited by: James_D

Tags: Java

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