vaadin-framework/tests/src/com/vaadin/tests/book/DefaultButtonExample.java

/* 
@ITMillApache2LicenseForJavaFiles@
 */

package com.vaadin.tests.book;

import com.vaadin.event.Action;
import com.vaadin.event.ShortcutAction;
import com.vaadin.event.Action.Handler;
import com.vaadin.ui.Button;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.FormLayout;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Label;
import com.vaadin.ui.Panel;
import com.vaadin.ui.TextField;

public class DefaultButtonExample extends CustomComponent implements Handler {
    // Define and create user interface components
    Panel panel = new Panel("Login");
    FormLayout formlayout = new FormLayout();
    TextField username = new TextField("Username");
    TextField password = new TextField("Password");
    HorizontalLayout buttons = new HorizontalLayout();

    // Create buttons and define their listener methods.
    Button ok = new Button("OK", this, "okHandler");
    Button cancel = new Button("Cancel", this, "cancelHandler");

    // Have the unmodified Enter key cause an event
    Action action_ok = new ShortcutAction("Default key",
            ShortcutAction.KeyCode.ENTER, null);

    // Have the C key modified with Alt cause an event
    Action action_cancel = new ShortcutAction("Alt+C",
            ShortcutAction.KeyCode.C,
            new int[] { ShortcutAction.ModifierKey.ALT });

    public DefaultButtonExample() {
        // Set up the user interface
        setCompositionRoot(panel);
        panel.addComponent(formlayout);
        formlayout.addComponent(username);
        formlayout.addComponent(password);
        formlayout.addComponent(buttons);
        buttons.addComponent(ok);
        buttons.addComponent(cancel);

        // Set focus to username
        username.focus();

        // Set this object as the action handler
        System.out.println("adding ah");
        panel.addActionHandler(this);

        System.out.println("start done.");
    }

    /**
     * Retrieve actions for a specific component. This method will be called for
     * each object that has a handler; in this example just for login panel. The
     * returned action list might as well be static list.
     */
    public Action[] getActions(Object target, Object sender) {
        System.out.println("getActions()");
        return new Action[] { action_ok, action_cancel };
    }

    /**
     * Handle actions received from keyboard. This simply directs the actions to
     * the same listener methods that are called with ButtonClick events.
     */
    public void handleAction(Action action, Object sender, Object target) {
        if (action == action_ok) {
            okHandler();
        }
        if (action == action_cancel) {
            cancelHandler();
        }
    }

    public void okHandler() {
        // Do something: report the click
        formlayout.addComponent(new Label("OK clicked. " + "User="
                + username.getValue() + ", password=" + password.getValue()));
        //  
    }

    public void cancelHandler() {
        // Do something: report the click
        formlayout.addComponent(new Label("Cancel clicked. User="
                + username.getValue() + ", password=" + password.getValue()));
    }
}