fr.putnami.pwt.core.widget.client.util.WidgetUtils.java Source code

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Here is the source code for fr.putnami.pwt.core.widget.client.util.WidgetUtils.java

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/**
 * This file is part of pwt.
 *
 * pwt is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser
 * General Public License as published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * pwt is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with pwt. If not,
 * see <http://www.gnu.org/licenses/>.
 */
package fr.putnami.pwt.core.widget.client.util;

import com.google.common.collect.Sets;
import com.google.gwt.user.client.ui.HasOneWidget;
import com.google.gwt.user.client.ui.HasWidgets;
import com.google.gwt.user.client.ui.IsWidget;
import com.google.gwt.user.client.ui.Widget;

import java.util.Iterator;
import java.util.Set;

import fr.putnami.pwt.core.editor.client.factory.CloneableWidget;

public final class WidgetUtils {

    private WidgetUtils() {
    }

    public static <W extends IsWidget> W cloneWidget(W widget) {
        if (widget == null) {
            return null;
        }
        assert widget instanceof CloneableWidget : widget.getClass() + " does not implement CloneableWidget";
        CloneableWidget cloneableWidget = (CloneableWidget) widget;
        return (W) cloneableWidget.cloneWidget();
    }

    public static Set<Widget> listChildren(Widget w) {
        Set<Widget> children = Sets.newHashSet();
        WidgetUtils.collectChildren(w, children);
        return children;
    }

    private static void collectChildren(Widget w, Set<Widget> children) {
        if (w instanceof HasWidgets) {
            HasWidgets hasWidgets = (HasWidgets) w;
            Iterator<Widget> it = hasWidgets.iterator();
            while (it.hasNext()) {
                Widget widget = it.next();
                if (!children.contains(widget)) {
                    children.add(widget);
                    WidgetUtils.collectChildren(widget, children);
                }
            }
        } else if (w instanceof HasOneWidget) {
            HasOneWidget hasOneWidget = (HasOneWidget) w;
            Widget widget = hasOneWidget.getWidget();
            if (!children.contains(widget)) {
                children.add(widget);
                WidgetUtils.collectChildren(widget, children);
            }
        }
    }
}