WizardPane:禁用屏幕上的“上一页"按钮 [英] WizardPane : Disable 'Previous' button on a screen

问题描述

如何在ControlsFX WizardPane的屏幕上禁用上一步"按钮?我正在尝试使用此方法prev.setDisable(true)，但是我所拥有的是NullPointerException.

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() {}
}

推荐答案

这将禁用该按钮.

@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); 
         }
    });       
}

这篇关于WizardPane:禁用屏幕上的“上一页"按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！