Thumbnail view of a TableView populated by an ObservableList

Hello

I'm inhabiting a TableView dynamically with objects in an ObservableList. I want to score a few lines with different colors according to their content and want to display the lines marked in a thumbnail view of the TableView. Essentially, the idea is to do something like the impressive app Beyond Compare is in the upper left window (see http://www.scootersoftware.com/images/TextCompare.png). Click on the thumbnail would be basically scroll your tableview to this location. The square on the thumbnail represents the data that is displayed on the screen and are sized in proportion with how long the TableView is and how many lines can be displayed on the screen at this time here.

Maybe I can bind a ListView to the same ObservableList who is populating the TableView, but just show a picture (thin colored line) for each line of the TableView which was marked. Any ideas on how I could make something like that?

Thank you

Yes, so I watched it again and that doesn't even come close to answer what you were asking. I was looking at the bottom of the image (which resembles a version filtered main screen) rather than the thumbnail at the top.

For the thumbnail, I think I'd try a VBox filled with thin horizontal rectangles. Something like:

final VBox thumbnail = new VBox();
thumbnail.setPrefWidth(50);
table.getItems().addListener(new ListChangeListener() {
     public void onChanged(Change change) {
          buildThumbnail(table, thumbnail);
     }
});
buildThumbnail(table, thumbnail);
// ...
private void buildThumbnail(Table table, VBox thumbnail) {
     thumbnail.getChildren().clear();
     int index = 0 ;
     for (T item : table.getItems()) {
          Rectangle rect = new Rectangle();
          rect.setHeight(2);
          rect.widthProperty().bind(thumbnail.widthProperty().subtract(2));
          if ( itemShouldBeHighlighted()) {
               rect.setFill(Color.RED);
          } else {
               rect.setFill(Color.WHITE);
          }
          final int itemIndex = index ;
          rect.setOnMouseClicked(new EventHandler() {
               @Override
               public void handle(MouseEvent event) {
                    table.scrollTo(itemIndex);
               }
          });
          thumbnail.getChildren().add(rect);
          index++;
     }

Tags: Java

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