001package gwt.material.design.client.base.helper;
002
003/*
004 * #%L
005 * GwtMaterial
006 * %%
007 * Copyright (C) 2015 - 2017 GwtMaterialDesign
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 * 
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 * 
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023import com.google.gwt.dom.client.Document;
024import com.google.gwt.dom.client.Element;
025import com.google.gwt.dom.client.Style;
026import com.google.gwt.user.client.ui.RootPanel;
027import gwt.material.design.client.base.MaterialWidget;
028import gwt.material.design.client.constants.Color;
029
030public class ColorHelper {
031
032    /**
033     * Returns first enum constant found..
034     *
035     * @param styleName    Space-separated list of styles
036     * @param enumClass    Type of enum
037     * @param defaultValue Default value of no match was found
038     * @return First enum constant found or default value
039     */
040    public static <E extends Enum<? extends Style.HasCssName>> E fromStyleName(final String styleName,
041                                                                               final Class<E> enumClass,
042                                                                               final E defaultValue) {
043        return EnumHelper.fromStyleName(styleName, enumClass, defaultValue, true);
044    }
045
046    public static String setupComputedBackgroundColor(Color color) {
047        MaterialWidget temp = new MaterialWidget(Document.get().createDivElement());
048        temp.setBackgroundColor(color);
049        RootPanel.get().add(temp);
050        String computed = getComputedBackgroundColor(temp.getElement()).toLowerCase();
051        temp.removeFromParent();
052        return computed;
053    }
054
055    /**
056     * Native call to getComputedStyle.
057     */
058    protected static native String getComputedBackgroundColor(Element e)/*-{
059        var cs = $wnd.document.defaultView.getComputedStyle(e, null);
060        return cs.getPropertyValue('background-color');
061    }-*/;
062}