com.jain.common.header.Header.java Source code

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Here is the source code for com.jain.common.header.Header.java

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/* 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.jain.common.header;

import com.jain.addon.JNIComponentInit;
import com.jain.addon.cdi.CDIComponent;
import com.jain.addon.i18N.I18NHelper;
import com.jain.theme.ApplicationTheme;
import com.vaadin.server.ThemeResource;
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.Component;
import com.vaadin.ui.Embedded;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.VerticalLayout;

@SuppressWarnings("serial")
public class Header extends HorizontalLayout implements ClickListener {
    private static final String IMAGES_LOGO_PNG = "images/logo.png";
    private Button current = null;
    private Component currentComponent = null;

    @JNIComponentInit
    public void init() {
        setMargin(true);
        setSpacing(true);
        setStyleName(ApplicationTheme.HEADER);
        setWidth("100%");
        addHeaderMenu();
        addLogo();
    }

    private void addHeaderMenu() {
        HorizontalLayout layout = new HorizontalLayout();
        layout.setStyleName(ApplicationTheme.HEADER_SEGMENT);

        int i = 0;
        Button button = null;

        for (JHeaderItem item : JHeaderItem.values()) {
            button = new Button(item.getDisplayName(), this);
            layout.addComponent(button);
            if (i == 0) {
                current = button;
                current.setStyleName(ApplicationTheme.FIRST);
                current.addStyleName(ApplicationTheme.SELECTED);
                i++;
            }
        }
        button.setStyleName(ApplicationTheme.LAST);
        addComponent(layout);
        setComponentAlignment(layout, Alignment.MIDDLE_LEFT);
        setExpandRatio(layout, 1);
    }

    public void addDefaultTab() {
        findNCreateCurrentComponent();
        VerticalLayout contentLayout = (VerticalLayout) getUI().getContent();
        contentLayout.setSpacing(false);
        contentLayout.setMargin(false);
        contentLayout.addComponent(currentComponent);
        contentLayout.setExpandRatio(currentComponent, 3);
    }

    private void addLogo() {
        Embedded em = new Embedded("", new ThemeResource(IMAGES_LOGO_PNG));
        addComponent(em);
        setComponentAlignment(em, Alignment.MIDDLE_RIGHT);
        setExpandRatio(em, 1);
    }

    public void buttonClick(ClickEvent event) {
        Button selected = event.getButton();

        if (selected != current) {
            current.removeStyleName(ApplicationTheme.SELECTED);
            current = event.getButton();
            current.addStyleName(ApplicationTheme.SELECTED);

            VerticalLayout layout = (VerticalLayout) getUI().getContent();

            if (currentComponent != null)
                layout.removeComponent(currentComponent);

            findNCreateCurrentComponent();

            if (currentComponent != null) {
                layout.setSpacing(false);
                layout.setMargin(false);
                layout.addComponent(currentComponent);
                layout.setExpandRatio(currentComponent, 3);
            }
        }
    }

    private void findNCreateCurrentComponent() {
        JHeaderItem item = JHeaderItem.getDisplayNameEquivlent(I18NHelper.getKey(current));
        if (item != null) {
            currentComponent = CDIComponent.getInstance(item.getModel());
        } else {
            currentComponent = null;
        }
    }
}