me.uni.emuseo.view.common.form.FormWithButtonsLayout.java Source code

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Here is the source code for me.uni.emuseo.view.common.form.FormWithButtonsLayout.java

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/*******************************************************************************
 * Copyright (c) 2016 Darian Jakubik.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser Public License v2.1
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * 
 * Contributors:
 *     Darian Jakubik - initial API and implementation
 ******************************************************************************/
package me.uni.emuseo.view.common.form;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.vaadin.data.fieldgroup.FieldGroup.CommitException;
import com.vaadin.server.FontAwesome;
import com.vaadin.ui.Alignment;
import com.vaadin.ui.Button;
import com.vaadin.ui.Button.ClickEvent;
import com.vaadin.ui.Button.ClickListener;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.VerticalLayout;

public abstract class FormWithButtonsLayout<T> extends VerticalLayout {

    private static final long serialVersionUID = 205262263499688089L;
    private static final Logger LOG = LoggerFactory.getLogger(FormWithButtonsLayout.class);
    private T bean;
    private FormBuilder<T> formBuilder;

    public FormWithButtonsLayout(T bean) {
        this.bean = bean;
        init();
    }

    protected void init() {
        formBuilder = buildForm(bean);
        addComponent(formBuilder.getContent());
        setComponentAlignment(formBuilder.getContent(), Alignment.MIDDLE_CENTER);

        HorizontalLayout buildButtons = buildButtons();
        addComponent(buildButtons);
    }

    protected abstract FormBuilder<T> buildForm(T bean);

    protected HorizontalLayout buildButtons() {

        final Button saveButton = new Button();
        final Button cancelButton = new Button();
        ClickListener clickListener = new ClickListener() {

            private static final long serialVersionUID = 5320702365033343873L;

            @Override
            public void buttonClick(ClickEvent event) {
                Button button = event.getButton();
                if (button.equals(saveButton)) {
                    onPreSave();
                } else if (button.equals(cancelButton)) {
                    onCancel();
                }
            }
        };
        HorizontalLayout buttonLayout = new HorizontalLayout();

        saveButton.addStyleName("primary");
        saveButton.setIcon(FontAwesome.SAVE);
        saveButton.addClickListener(clickListener);

        cancelButton.addStyleName("primary");
        cancelButton.setIcon(FontAwesome.UNDO);
        cancelButton.addClickListener(clickListener);

        buttonLayout.addComponent(saveButton);
        buttonLayout.addComponent(cancelButton);
        buttonLayout.setSpacing(true);
        buttonLayout.addStyleName("form-buttons");

        return buttonLayout;
    }

    protected void onCancel() {
        formBuilder.discard();
    }

    protected void onPreSave() {
        try {
            formBuilder.commit();
            T bean = formBuilder.getBean();
            onSave(bean);
        } catch (CommitException e) {
            LOG.warn("Commit failed", e);
        }
    }

    protected abstract void onSave(T bean);
}