TableView problem of automatic update in points 2.1 and 2.2

Hi, guys!

Initial situation: I have a TableView with some elements inside. I update an element (a user object), I remove it from the table and then I put it again to the same index.

The labour code in 2.0.2:
// Gets selected item
User selectedUser = (User) table.getSelectionModel().getSelectedItem();

// Updates the User object to show the new data in the table
selectedUser.setFirstName(fNameTF.getText());
selectedUser.setLastName(lNameTF.getText());
selectedUser.setRank((String) (rankCB.getSelectionModel().getSelectedItem()));
selectedUser.setPassword(passTF.getText());

// Updates table data.
// First gets the user Object index in the items list,
// then removes the user object from the table list,
// then adds the updated user object at the same index it was before.
int userObjectIndexInItemsList = table.getItems().indexOf(selectedUser);
table.getItems().remove(table.getItems().indexOf(selectedUser));
table.getItems().add(userObjectIndexInItemsList, selectedUser);
Here's my problem: in the version 2.1 and 2.2 (b06) this no longer works. The table does not display the changed data. I also tried getTableItems tableData (new FXCollections.observableArrayList ()), then table.setItems (null), then table.setItems (tableData), but it did not work.
So, the problem is that the FXCollections.observableArrayList () (which has been used to fill the table in the beginning) don't relate more to the table when a change is made.

Possible, but not desired collaborative:
1. total re-creation of the table.
2. total recreation of the tableItems (create a new observable by new objects).

Any suggestions?
I don't want to recreate the table data whenever a change is made, in particular because it is based on a database.

JavaFX has a fundamentally different way of handling these types of updates, which can make it difficult to implement this in your current system.

In short, how updates work in JavaFX of the ListView, TreeView, and TableView is the following:

Each view type is made of cells. The number of cells is usually pretty close to the amount of visible lines and each cell could be considered to represent a line.

Each cell is basically a small piece of the user interface that adapts to everything that should appear on the line given at that time there. The updateItem method is called on these cells to associate them with an underlying element of the ObservableList (the model).

Let's say that your "Items" in the model are objects with a person's name. An implementation of the cell could make this as follows:

  private static final class PersonTableCell extends TableCell {

    @Override
    protected void updateItem(final Person person, boolean empty) {
      super.updateItem(mediaNode, empty);

      if(!empty) {
        setText(person.getTitle());
      }
    }
  }

The example above will also have the same problem to update your code, otherwise, if you change the subject Person in your model of the cell will not reflect the name changed.

In JavaFX to inform the cell of the modification, you must add a listener to the property 'text' of your person object. This assumes that a Person object properties are the properties of style of JavaFX. This is done like this (using a binding that uses an internal auditor):

  private static final class PersonTableCell extends TableCell {

    @Override
    protected void updateItem(final Person person, boolean empty) {
      super.updateItem(mediaNode, empty);

      textProperty().unbind();

      if(!empty) {
        textProperty().bind(person.titleProperty());
      }
    }
  }

The foregoing will automatically updated correctly each change to the title property of the person.

However, this means that you need to change your Person object to use the JavaFX style properties. You donot have always this luxury hotel. However, there are other options. You could for example only support a "changedProperty" in the Person class and have cells listening to it, something like this:

  private static final class PersonTableCell extends TableCell {
    private Person oldPerson;
    private InvalidationListener listener;

    @Override
    protected void updateItem(final Person person, boolean empty) {
      super.updateItem(mediaNode, empty);

      if(oldPerson != null) {
        oldPerson.removeListener(listener);
        oldPerson = null;
      }

      if(!empty) {
        listener = new InvalidatonListener() {
          public void invalidated(Observable o) {
             setText(person.getTitle());
          }
        };
        person.addListener(listener);
        setText(person.getTitle());
      }
    }
  }

Now whenever you want to trigger a "change", you call a method on the Person object that triggers a cancel event. All cells that are tuned to this person object will be notified and update.

If you donot change the class of the person itself, you could also do this with a wrapper. You will have to experiment a little.

Tags: Java

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