org.pentaho.gwt.widgets.client.tabs.AlwaysVisibleDeckPanel.java Source code

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Here is the source code for org.pentaho.gwt.widgets.client.tabs.AlwaysVisibleDeckPanel.java

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/*!
 * This program is free software; you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 * or from the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program 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.
 *
 * Copyright (c) 2002-2013 Pentaho Corporation..  All rights reserved.
 */

package org.pentaho.gwt.widgets.client.tabs;

import com.google.gwt.user.client.ui.DeckPanel;
import com.google.gwt.user.client.ui.Widget;

/**
 * User: nbaker Date: 2/7/13
 */
public class AlwaysVisibleDeckPanel extends DeckPanel {
    Widget curWidget;

    public AlwaysVisibleDeckPanel() {

    }

    public void showWidget(int index) {
        checkIndexBoundsForAccess(index);
        Widget oldWidget = curWidget;
        curWidget = getWidget(index);

        if (curWidget != oldWidget && oldWidget != null) {
            moveOffscreen(oldWidget);
        }

        // set the sizes to 100% to account for any window resizing.
        curWidget.getElement().getParentElement().getStyle().setProperty("width", "100%");
        curWidget.getElement().getParentElement().getStyle().setProperty("height", "100%");
        curWidget.getElement().getParentElement().getStyle().setProperty("position", "relative");
        curWidget.getElement().getParentElement().getStyle().setProperty("left", "0");
    }

    protected void moveOffscreen(Widget w) {
        if (w.getElement() == null || w.getElement().getParentElement() == null) { // old active widget was removed.
            return;
        }

        if (w.getParent().getOffsetWidth() > 0 && w.getParent().getOffsetHeight() > 0) {
            int width = w.getElement().getParentElement().getOffsetWidth();
            int height = w.getElement().getParentElement().getOffsetHeight();

            // don't let the switching between relative and absolute positioning modify our size.
            // force the size with inline styles, we'll set it back to 100% when we show it again
            w.getElement().getParentElement().getStyle().setProperty("width", width + "px");
            w.getElement().getParentElement().getStyle().setProperty("height", height + "px");
        }

        w.getElement().getParentElement().getStyle().setProperty("position", "absolute");
        w.getElement().getParentElement().getStyle().setProperty("left", "-5000px");
    }

    @Override
    public int getVisibleWidget() {
        return this.getWidgetIndex(curWidget);
    }

    @Override
    public void add(Widget w) {
        super.add(w);
        w.setVisible(true);
        w.getElement().getParentElement().getStyle().setProperty("display", "");
        moveOffscreen(w);
    }
}