com.edgenius.wiki.gwt.client.widgets.Lightbox.java Source code

Introduction

Here is the source code for com.edgenius.wiki.gwt.client.widgets.Lightbox.java

Source

/* 
 * =============================================================
 * Copyright (C) 2007-2011 Edgenius (http://www.edgenius.com)
 * =============================================================
 * License Information: http://www.edgenius.com/licensing/edgenius/2.0/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2.0
 * as published by the Free Software Foundation.
 *
 * 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * http://www.gnu.org/licenses/gpl.txt
 *  
 * ****************************************************************
 */
package com.edgenius.wiki.gwt.client.widgets;

import java.util.List;

import com.edgenius.wiki.gwt.client.Css;
import com.google.gwt.event.logical.shared.ResizeEvent;
import com.google.gwt.event.logical.shared.ResizeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.gwt.user.client.ui.UIObject;

/**
 * @author dapeng
 */
public class Lightbox {

    private PopupPanel background;
    private PopupPanel popup;
    private HandlerRegistration evtReg;
    private UIObject owner;

    /**
     * Only show background mask on owner scope. if owner is null, then it is entire page scope. 
     * @param owner
     * @param popup
     */
    public Lightbox(UIObject owner, final PopupPanel popup) {
        this.popup = popup;
        this.owner = owner;
        background = new PopupPanel();
        background.setStyleName(Css.LIGHT_BOX_BK);

        if (owner == null) {
            DOM.setStyleAttribute(background.getElement(), "width", "100%");
            DOM.setStyleAttribute(background.getElement(), "height", "5000px"); //Window.getClientHeight()

            evtReg = Window.addResizeHandler(new ResizeHandler() {
                public void onResize(ResizeEvent event) {
                    //background need be adjust size, but popup won't display if it is not showing. 
                    if (popup.isShowing()) {
                        popup.center();
                        if (popup instanceof DialogBox) {
                            List<DialogListener> listeners = ((DialogBox) popup).getDialogListeners();
                            if (listeners != null) {
                                for (DialogListener listener : listeners) {
                                    listener.dialogRelocated((DialogBox) popup);
                                }
                            }
                        }
                    }
                }
            });
        } else {
            background.setPopupPosition(owner.getAbsoluteLeft(), owner.getAbsoluteTop());
            DOM.setStyleAttribute(background.getElement(), "width", owner.getOffsetWidth() + "px");
            DOM.setStyleAttribute(background.getElement(), "height", owner.getOffsetHeight() + "px");
        }

    }

    public Lightbox(final PopupPanel popup) {
        this(null, popup);
    }

    /**
     * Do not call this method in inherit popup.show()
     */
    public void show() {
        if (owner == null) {
            background.center();
        } else {
            background.show();
        }
        popup.center();

    }

    public void hide() {
        popup.hide();
        background.hide();

        if (evtReg != null) {
            evtReg.removeHandler();
            evtReg = null;
        }

    }

}