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A Material Design look and feel for GWT Applications

There is a newer version: 2.8.3

package gwt.material.design.client.ui;

/*
 * #%L
 * GwtMaterial
 * %%
 * Copyright (C) 2015 GwtMaterialDesign
 * %%
 * 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.
 * #L%
 */

import gwt.material.design.client.base.MaterialWidget;
import gwt.material.design.client.base.helper.UiHelper;
import gwt.material.design.client.constants.HeadingSize;
import gwt.material.design.client.ui.html.Heading;

import com.google.gwt.dom.client.Document;
import com.google.gwt.user.client.ui.Widget;
import gwt.material.design.client.ui.html.ListItem;

//@formatter:off
/**
* Collections allow you to group list objects together.
* 
*
*
UiBinder Usage:
**{@code 
*Simple

    
    
    
    


Links

    
    
    
    


Header

    
    
    
    


Secondary Content

    
        
        
    
    
        
        
    
    
        
        
    
    
        
        
    

*}
*
* 
* @author kevzlou7979
* @author Ben Dol
* @see Material Collections
*/
//@formatter:on
public class MaterialCollection extends MaterialWidget {

    private Heading span = new Heading(HeadingSize.H4);
    private int index;

    /**
     * Creates an empty collection component.
     */
    public MaterialCollection() {
        super(Document.get().createULElement(), "collection");
    }

    /**
     * Sets the header of the collection component.
     */
    public void setHeader(String header){
        span.getElement().setInnerHTML(header);
        addStyleName("with-header");
        ListItem item = new ListItem(span);
        UiHelper.addMousePressedHandlers(item);
        item.setStyleName("collection-header");
        insert(item, 0);
    }

    public void setActive(int index) {
        this.index = index;
        Widget activeWidget = getActive();
        if(activeWidget != null) {
            activeWidget.removeStyleName("active");
            activeWidget.addStyleName("active");
        }
    }

    public Widget getActive() {
        try {
            return getWidget(index);
        } catch (IndexOutOfBoundsException ex) {
            return null;
        }
    }
}