org.jboss.errai.mvp.client.presenters.RootView.java Source code

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Here is the source code for org.jboss.errai.mvp.client.presenters.RootView.java

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/*
 * Copyright 2012 Cedric Hauber
 *
 *    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.jboss.errai.mvp.client.presenters;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.Style;
import com.google.gwt.user.client.ui.RootLayoutPanel;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;
import org.jboss.errai.mvp.client.views.ViewImpl;

/**
 * {@link RootPresenter}'s view.
 */
public class RootView extends ViewImpl implements RootPresenter.MyView {

    private boolean usingRootLayoutPanel;

    /**
     * The glass element.
     */
    private Element glass;

    @Override
    public Widget asWidget() {
        assert false : "Root view has no widget, you should never call asWidget()";
        return null;
    }

    @Override
    public void setInSlot(Object slot, Widget content) {
        assert slot == RootPresenter.rootSlot : "Unknown slot used in the root proxy.";

        if (usingRootLayoutPanel) {
            // TODO Next 3 lines are a dirty workaround for
            // http://code.google.com/p/google-web-toolkit/issues/detail?id=4737
            RootPanel.get().clear();
            RootLayoutPanel.get().clear();
            RootPanel.get().add(RootLayoutPanel.get());
            if (content != null) {
                RootLayoutPanel.get().add(content);
            }
        } else {
            // TODO Next 2 lines are a dirty workaround for
            // http://code.google.com/p/google-web-toolkit/issues/detail?id=4737
            RootLayoutPanel.get().clear();
            RootPanel.get().clear();
            if (content != null) {
                RootPanel.get().add(content);
            }
        }
    }

    public void setUsingRootLayoutPanel(boolean usingRootLayoutPanel) {
        this.usingRootLayoutPanel = usingRootLayoutPanel;
    }

    public void lockScreen() {
        ensureGlass();
        Document.get().getBody().appendChild(glass);
    }

    public void unlockScreen() {
        ensureGlass();
        Document.get().getBody().removeChild(glass);
    }

    public void ensureGlass() {
        if (glass == null) {
            glass = Document.get().createDivElement();

            Style style = glass.getStyle();
            style.setPosition(Style.Position.ABSOLUTE);
            style.setLeft(0, Style.Unit.PX);
            style.setTop(0, Style.Unit.PX);
            style.setRight(0, Style.Unit.PX);
            style.setBottom(0, Style.Unit.PX);
            style.setZIndex(2147483647); // Maximum z-index
        }
    }
}