001/*
002 * #%L
003 * GwtMaterial
004 * %%
005 * Copyright (C) 2015 - 2017 GwtMaterialDesign
006 * %%
007 * Licensed under the Apache License, Version 2.0 (the "License");
008 * you may not use this file except in compliance with the License.
009 * You may obtain a copy of the License at
010 * 
011 *      http://www.apache.org/licenses/LICENSE-2.0
012 * 
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 * #L%
019 */
020package gwt.material.design.client.ui;
021
022import com.google.gwt.dom.client.Document;
023import com.google.gwt.dom.client.Style;
024import com.google.gwt.user.client.ui.Widget;
025import gwt.material.design.client.base.MaterialWidget;
026import gwt.material.design.client.constants.CssName;
027import gwt.material.design.client.ui.html.ListItem;
028import gwt.material.design.client.ui.html.UnorderedList;
029
030//@formatter:off
031
032/**
033 * CollapsibleItem element to define the header
034 *
035 * @author kevzlou7979
036 * @author Ben Dol
037 * @see <a href="http://gwtmaterialdesign.github.io/gwt-material-demo/#collapsible">Material Collapsibles</a>
038 * @see <a href="https://material.io/guidelines/components/expansion-panels.html#expansion-panels-behavior">Material Design Specification</a>
039 */
040//@formatter:on
041public class MaterialCollapsibleHeader extends MaterialWidget {
042
043    /**
044     * Creates empty collapsible header.
045     */
046    public MaterialCollapsibleHeader() {
047        super(Document.get().createDivElement(), CssName.COLLAPSIBLE_HEADER);
048    }
049
050    /**
051     * Adds other components as header.
052     */
053    public MaterialCollapsibleHeader(final Widget... widgets) {
054        this();
055        for (Widget w : widgets) {
056            add(w);
057        }
058    }
059
060    @Override
061    public void add(Widget child) {
062        if (child instanceof UnorderedList) {
063            for (Widget w : (UnorderedList) child) {
064                if (w instanceof ListItem) {
065                    w.getElement().getStyle().setDisplay(Style.Display.BLOCK);
066                }
067            }
068        } else if (child instanceof ListItem) {
069            child.getElement().getStyle().setDisplay(Style.Display.BLOCK);
070        }
071        super.add(child);
072    }
073}