CODEWITHSUNDEEP
javalayoutvaadinvaadin7
antobbo
antobbo

Reputation: 285

Can't add component to layout

hi all I'm having a strange problem, but I'm sure I'm doing something stupid. In a maven project I have my UI class as below:

package my.vaadin.project.exceptionTest;
import javax.servlet.annotation.WebServlet;
import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.annotations.Widgetset;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.Label;
import com.vaadin.ui.TextField;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;
@Theme("mytheme")
@Widgetset("my.vaadin.project.exceptionTest.MyAppWidgetset")
public class MyUI extends UI {

    @Override
    protected void init(VaadinRequest vaadinRequest) {
        final VerticalLayout layout = new VerticalLayout();
        final Calculation calculation = new Calculation();
        final Label title = new Label("Calculation");       
        layout.addComponents(title, calculation);       
        layout.setMargin(true);
        layout.setSpacing(true);        
        setContent(layout);
    }
    @WebServlet(urlPatterns = "/*", name = "MyUIServlet", asyncSupported = true)
    @VaadinServletConfiguration(ui = MyUI.class, productionMode = false)
    public static class MyUIServlet extends VaadinServlet {
    }
}

And then I have another class which holds various fields that I then attempt to add to the UI, unsuccessfully:

package my.vaadin.project.exceptionTest;
import java.awt.Component;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.TextField;
import com.vaadin.ui.VerticalLayout;
import com.vaadin.event.Action;
public class Calculation extends CustomComponent{
    final VerticalLayout vl = new VerticalLayout();
    final TextField divisor = new TextField();
    final TextField dividend = new TextField();
    Button button = new Button("Click Me"); 
    public Calculation(){
        divisor.setCaption("Enter the divisor:");
        dividend.setCaption("Enter the dividend:");
        button.addClickListener( new Button.ClickListener(){
            @Override
            public void buttonClick(ClickEvent event) {
                System.out.println("this is a test");               
            }            
        });     
        vl.setMargin(true);
        vl.setSpacing(true);
        vl.addComponents(divisor, dividend, button );
    }
}

So my question is, when in the UI class I do

layout.addComponents(title, calculation);

I get an error saying: "The method addComponents(Component...) in the type AbstractComponentContainer is not applicable for the arguments (Label, Calculation)" I've done something similar before, like creating an object of a separate class and add it to the layout and it has worked, this time it doesn't and I'm not sure what it is that I've done wrong...any idea? thanks

Upvotes: 0

Views: 501

Answers (1)

André Schild
André Schild

Reputation: 4754

The method addComponents(...) only accepts Componentas arguments. Your Calculation class does not extend/implement Component

https://vaadin.com/api/com/vaadin/ui/AbstractComponentContainer.html#addComponents(com.vaadin.ui.Component...)

Upvotes: 1

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