package org.example;

import com.vaadin.navigator.View;
import com.vaadin.ui.Button;
import com.vaadin.ui.Label;
import com.vaadin.ui.VerticalLayout;

public class MyView extends VerticalLayout implements View {
    public MyView()  {
        // Create the content of your VerticalLayout view
        Label label = new Label("This is a VerticalLayout-based view!");
        addComponent(label);

        Button button = new Button("Go to Home View");
        button.addClickListener(event -> {
            getUI().getNavigator().navigateTo("");
        });
        addComponent(button);

    }
}
 

package com.example.application.views.list;

import com.vaadin.flow.component.BlurNotifier;
import com.vaadin.flow.component.ClickEvent;
import com.vaadin.flow.component.FocusNotifier;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.orderedlayout.VerticalLayout;
import com.vaadin.flow.router.Route;

@Route(value = "RefButton", layout = MainLayout.class)
public class ViewWithMethodReference extends VerticalLayout {

    public ViewWithMethodReference() {
        // Button 1 method ref within the Button component
        Button button1 = new Button("click me!",this::NotifTrigger);
        // Button 2 method ref with add*Listener
        Button button2 = new Button("Click and Look");
        // see the same nofitication handler for both buttons
        button2.addClickListener(this::NotifTrigger);
        button2.addFocusListener(this::RedBackground);
        button2.addBlurListener(this::GoBackToDefault);

        add(button1,button2);
    }

    private void NotifTrigger(ClickEvent<Button> event) {
        Notification.show("Clicked!");
    }
    private void RedBackground(FocusNotifier.FocusEvent<Button> event) {
        event.getSource().getStyle().set("background-color", "red");

    }

    private void GoBackToDefault(BlurNotifier.BlurEvent<Button> event) {
        event.getSource().getStyle().remove("background-color");
    }
}

package org.example;

import com.vaadin.navigator.View;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickListener;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Label;
import com.vaadin.ui.Notification;
import com.vaadin.ui.VerticalLayout;

public class AnonymousView extends VerticalLayout implements View {
    public AnonymousView() {
        // Create the content of your home page view
        Label label = new Label("Welcome to the Anonymous Page!");
        addComponent(label);
        // Create the content root layout for the UI
        HorizontalLayout content = new HorizontalLayout();

        // Display the greeting
        content.addComponent(new Label("Hello World!"));

        // Have a clickable button
        content.addComponent(new Button("Push Me!",
                click -> Notification.show("Pushed!")));

        Button button = new Button("Go to My View");
        button.addClickListener(new ClickListener() {
            @Override
            public void buttonClick(final ClickEvent event) {
                // Handle the button click event in Vaadin 8.20
                // You can perform actions here
                getUI().getNavigator().navigateTo("my-view");

            }
        });
        addComponent(button);


        MyForm myform = new MyForm();
        addComponent(myform);

    }
}

package org.example2.combobox;

import com.vaadin.data.HasValue;
import com.vaadin.navigator.View;
import com.vaadin.ui.ComboBox;
import com.vaadin.ui.Notification;
import com.vaadin.ui.VerticalLayout;

import static org.example2.combobox.MyCustomComboBoxCls.MyCustomComboBox;

public class ComboBoxView10 extends VerticalLayout implements View {
    public ComboBoxView10() {

        final ComboBox<String> ComboBox10 = MyCustomComboBox("MyComboBox",ComboBoxCustomListener::myComboBoxListener);
        addComponent(ComboBox10);

    }

}

package org.example2.combobox;

import com.vaadin.data.HasValue;
import com.vaadin.ui.CheckBox;
import com.vaadin.ui.ComboBox;

public class MyCustomComboBoxCls {

    public static ComboBox<String> MyCustomComboBox(final String caption, final HasValue.ValueChangeListener<String> clickListener ) {
        final ComboBox<String> cmbx = new ComboBox<>(caption);
        cmbx.setItems("Chrome", "Edge", "Firefox", "Safari");
        cmbx.setTextInputAllowed(true);
        cmbx.addValueChangeListener(clickListener);
        return cmbx;
    }

}

package org.example2.combobox;

import com.vaadin.data.HasValue;
import com.vaadin.ui.Notification;

public class ComboBoxCustomListener {
    public static void myComboBoxListener(HasValue.ValueChangeEvent<String> stringValueChangeEvent) {
        Notification.show("ComboBox 10");
    }

    public static HasValue.ValueChangeListener<String> myComboBoxListenerbis() {
        return e -> Notification.show("ComboBox11");
    }
}