WizardPane : Disable 'Previous' button on a screen

Question

How can I disable the 'Previous' button on my Screen of the ControlsFX WizardPane? I am trying it with this method prev.setDisable(true) but what I have is NullPointerException.

public class MainApp extends Application {
    Wizard wizard = new Wizard();

    WizardPane1 page1 = new WizardPane1();

    WizardPane page2 = new WizardPane();

    WizardPane page3 = new WizardPane() {
        @Override
        public void onEnteringPage(Wizard wizard) {
            Node prev = lookupButton(ButtonType.PREVIOUS);
            prev.setDisable(true);
        }
    };

    page1.setContent(page1.getInit());

    wizard.setFlow(new LinearFlow(page1, page2, page3));
    wizard.showAndWait();

}

public class WizardPane1 extends WizardPane {
      public void initWizard() {}
}

Hi you can look from this page http://controlsfx.bitbucket.org/org/controlsfx/dialog/Wizard.html — Z.B, Aug 26 '15 at 08:05
What does it print for s.o.println(getButtonTypes()); in onEnteringPage() method? — Uluk Biy, Aug 26 '15 at 08:30
Output : [ButtonType [text=Vorheriger, buttonData=BACK_PREVIOUS], ButtonType [text=Nächster, buttonData=NEXT_FORWARD], ButtonType [text=Fertigstellen , buttonData=FINISH], ButtonType [text=Abbrechen, buttonData=CANCEL_CLOSE]] — Z.B, Aug 26 '15 at 08:47

score 1 · Answer 1 · answered Sep 28 '18 at 19:02

This will disable the button.

@Override 
public void onEnteringPage( Wizard wizard ) { 
     for ( ButtonType type : getButtonTypes() ) {
         if ( type.getButtonData().equals(ButtonBar.ButtonData.BACK_PREVIOUS) ){
             System.out.println("Found Back button");
             previous_button = (Button) lookupButton( type );
             break;
         }
     }

     Platform.runLater(new Runnable() {
         @Override 
         public void run() {        
          previous_button.setDisable(true); 
         }
    });       
}

Yes it works. For algorithm clarity, I prefer to use a while instead of a for with break. But it is a cosmetic detail. — Frédéric Vinet, Sep 06 '19 at 08:21

Uluk Biy · Answer 2 · 2015-08-26T10:20:54.653

I didn't try but according to source code of Wizard, it adds its own "Previous" button, and to lookup it you may need to get the reference exactly to the same ButtonType by first looking it up using the ButtonData:

WizardPane page3 = new WizardPane()
{
    @Override
    public void onEnteringPage( Wizard wizard )
    {
        for ( ButtonType type : getButtonTypes() )
        {
            if ( type.getButtonData().equals(ButtonBar.ButtonData.BACK_PREVIOUS) )
            {
                Node prev = lookupButton( type );
                prev.setDisable( true );
                break;
            }
        }
    }
};

I don't have a NullPointerException but the button is not disabled. — Z.B, Aug 26 '15 at 09:38

score -1 · Answer 3 · answered Aug 26 '15 at 12:01

-1

This is the solution and it works :))

@Override
public void onEnteringPage(Wizard wizard) {

    ObservableList<ButtonType> list = getButtonTypes();

    for (ButtonType type : list) {
        if (type.getButtonData().equals(ButtonBar.ButtonData.BACK_PREVIOUS)) {
            Node prev = lookupButton(type);
            prev.visibleProperty().setValue(Boolean.FALSE);

        }
    }
}

answered Aug 26 '15 at 12:01

Z.B

61
8

You are hiding the button, not disabling it as asked in your question. Beside that it has no difference from the other answer. – Uluk Biy Aug 26 '15 at 12:52
You are right. I have a solution for hidding but not for disabling. – Z.B Aug 26 '15 at 12:58

WizardPane : Disable 'Previous' button on a screen

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