Best way to wait for input in a for loop?

Question

In JavaFX 2 I have a TableView beeing populated by reading an Excel file. It looks like this:

identification    cellcount    calved
o0001             12345        false
o0002             65432        true
o0003             55555        false
...

When users press the 'Import' button, all records have to be added to a database. However, If the 'calved' field has 'true' as value, I show a Dialog window where the users have to select a date to specify when the calving happened. Now the big question is that I want my for loop beeing paused as soon as a Dialog window is open. With my current code, all Dialog windows are stacked on eachother.

This is the Dialog method which loads an FXML:

public void showDialog(String sURL){
    final Stage myDialog = new Stage();
    myDialog.initStyle(StageStyle.UTILITY);
    myDialog.initModality(Modality.APPLICATION_MODAL);

    URL url = getClass().getResource(sURL);

    FXMLLoader fxmlloader = new FXMLLoader();
    fxmlloader.setLocation(url);
    fxmlloader.setBuilderFactory(new JavaFXBuilderFactory());
    try {
        Node n = (Node) fxmlloader.load(url.openStream());

        Scene myDialogScene = new Scene(VBoxBuilder.create().children(n).alignment(Pos.CENTER).padding(new Insets(0)).build());

        myDialog.setScene(myDialogScene);
        myDialog.show();
    } catch (Exception ex) {
        System.out.println(ex);
    }
}

And here is the for loop where I handle the tablerows:

@FXML
private void handle_ImportCowDataButton(ActionEvent event) {
    Cows selectedCow;

    for(ImportRow row: tblImport.getItems()){
        selectedCow = null;

        for (Cows cow : olCows) {
            if (cow.getOfficial().equals(row.getCownumber())) {
                selectedCow = cow;
            }
        }

        if (selectedCow != null) {
            if (row.getCalving()) {
                //if cow exists and cow has calved, show dialog window loading addcalving.fxml
                //then the for loop should wait until that dialog window is closed before continuing
                Context.getInstance().setPassthroughObject(selectedCow);
                Context.getInstance().showDialog("/GUI/calving/AddCalving.fxml");
            }
        } else {
            //if cow does not exist, show dialog window loading addcow.fxml
            //then the for loop should wait until that dialog window is closed before continuing
            Context.getInstance().setPassthroughObject(selectedFarmer);
            Context.getInstance().showDialog("/GUI/cow/AddCow.fxml");
        }
    }
}

Is working with setOnCloseRequest() in my showDialog() method an option?

I know break is not the sollution, however, even if I don't use it, the Dialogs are just stacked on eachother and the for loop is not waiting for input — Perneel, Nov 17 '12 at 17:40
Hey Sergey, I changed the code for handling the import as it seemed to be a bit messy and unclear. This is how I wrote it at first before trying to pause the for loopt. Dialog was just a class which I was using for troubleshooting :) — Perneel, Nov 18 '12 at 08:13
http://stackoverflow.com/questions/10347883/creating-a-javafx-dialog-box, may be helpful :) — invariant, Nov 21 '12 at 20:27

score 1 · Answer 1 · answered Nov 17 '12 at 22:50

1

If you copy the cows list into another data structure such as a queue and remove each cow as it is processed, it is relatively easy to resume processing it since only the cows that need to be processed remain.

answered Nov 17 '12 at 22:50

Andy Till

3,371
2
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score 0 · Accepted Answer · answered Nov 21 '12 at 20:20

It seems the answer was much easier then I thought, simply use the showAndWait() method instead of show(). How on earth could I have missed that... Thanks for the help thou.

Final code of the showDialog() method:

public void showDialog(String sURL){
    final Stage myDialog = new Stage();
    myDialog.initStyle(StageStyle.UTILITY);
    myDialog.initModality(Modality.APPLICATION_MODAL);

    URL url = getClass().getResource(sURL);

    FXMLLoader fxmlloader = new FXMLLoader();
    fxmlloader.setLocation(url);
    fxmlloader.setBuilderFactory(new JavaFXBuilderFactory());
    try {
        Node n = (Node) fxmlloader.load(url.openStream());

        Scene myDialogScene = new Scene(VBoxBuilder.create().children(n).alignment(Pos.CENTER).padding(new Insets(0)).build());

        myDialog.setScene(myDialogScene);
        myDialog.showAndWait();
    } catch (Exception ex) {
        System.out.println(ex);
    }
}

Best way to wait for input in a for loop?

2 Answers2