StyleHelper.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.uberfire.ext.widgets.common.client.common;

import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style;

/**
 * Borrow from GWTBootstrap3 (https://github.com/gwtbootstrap3/gwtbootstrap3)
 */
public final class StyleHelper {

    // ------------------------------
    // Helpers for legacy GWT Element
    // ------------------------------

    public static <E extends Style.HasCssName, F extends Enum<? extends Style.HasCssName>> void addUniqueEnumStyleName(final Element element,
                                                                                                                       final Class<F> enumClass,
                                                                                                                       final E style) {
        removeEnumStyleNames(element,
                             enumClass);
        addEnumStyleName(element,
                         style);
    }

    public static <E extends Enum<? extends Style.HasCssName>> void removeEnumStyleNames(final Element element,
                                                                                         final Class<E> enumClass) {

        for (final Enum<? extends Style.HasCssName> constant : enumClass.getEnumConstants()) {
            final String cssClass = ((Style.HasCssName) constant).getCssName();

            if (cssClass != null && !cssClass.isEmpty()) {
                element.removeClassName(cssClass);
            }
        }
    }

    public static <E extends Style.HasCssName> void addEnumStyleName(final Element element,
                                                                     final E style) {

        if (style != null && style.getCssName() != null && !style.getCssName().isEmpty()) {
            element.addClassName(style.getCssName());
        }
    }

    public static <E extends Style.HasCssName> void removeEnumStyleName(final Element element,
                                                                        final E style) {

        if (style != null && style.getCssName() != null && !style.getCssName().isEmpty()) {
            element.removeClassName(style.getCssName());
        }
    }
}