com.ephesoft.gxt.core.client.ThumbnailStack.java Source code

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Here is the source code for com.ephesoft.gxt.core.client.ThumbnailStack.java

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/********************************************************************************* 
* Ephesoft is a Intelligent Document Capture and Mailroom Automation program 
* developed by Ephesoft, Inc. Copyright (C) 2015 Ephesoft Inc. 
* 
* This program is free software; you can redistribute it and/or modify it under 
* the terms of the GNU Affero General Public License version 3 as published by the 
* Free Software Foundation with the addition of the following permission added 
* to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED WORK 
* IN WHICH THE COPYRIGHT IS OWNED BY EPHESOFT, EPHESOFT DISCLAIMS THE WARRANTY 
* OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. 
* 
* 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 Affero General Public License for more 
* details. 
* 
* You should have received a copy of the GNU Affero General Public License along with 
* this program; if not, see http://www.gnu.org/licenses or write to the Free 
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 
* 02110-1301 USA. 
* 
* You can contact Ephesoft, Inc. headquarters at 111 Academy Way, 
* Irvine, CA 92617, USA. or at email address info@ephesoft.com. 
* 
* The interactive user interfaces in modified source and object code versions 
* of this program must display Appropriate Legal Notices, as required under 
* Section 5 of the GNU Affero General Public License version 3. 
* 
* In accordance with Section 7(b) of the GNU Affero General Public License version 3, 
* these Appropriate Legal Notices must retain the display of the "Ephesoft" logo. 
* If the display of the logo is not reasonably feasible for 
* technical reasons, the Appropriate Legal Notices must display the words 
* "Powered by Ephesoft". 
********************************************************************************/

package com.ephesoft.gxt.core.client;

import java.util.LinkedList;
import java.util.List;

import com.ephesoft.gxt.core.shared.util.CollectionUtil;
import com.ephesoft.gxt.core.shared.util.StringUtil;
import com.google.gwt.dom.client.Element;
import com.google.gwt.event.dom.client.MouseDownEvent;
import com.google.gwt.event.dom.client.MouseDownHandler;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;

public class ThumbnailStack extends HorizontalPanel {

    private static final int MAXIMUM_STACKED_IMAGES = 5;
    private List<Image> imageList;

    public ThumbnailStack(final List<Image> imageList) {
        this.addStyleName("thumbnailStack");
        this.imageList = imageList != null ? imageList : new LinkedList<Image>();
        this.layout();
    }

    public void layout() {
        if (!CollectionUtil.isEmpty(imageList)) {
            Image firstImage = null;
            Image secondImage = null;
            Image middleImage = null;
            Image secondLastImage = null;
            Image lastImage = null;
            this.clear();
            final int thumbnailListSize = imageList.size();
            final int thumbailDisplayImages = thumbnailListSize > MAXIMUM_STACKED_IMAGES ? MAXIMUM_STACKED_IMAGES
                    : thumbnailListSize;
            switch (thumbailDisplayImages) {
            case 1:
                firstImage = imageList.get(0);
                break;
            case 2:
                firstImage = imageList.get(0);
                lastImage = imageList.get(1);
                break;
            case 3:
                firstImage = imageList.get(0);
                secondImage = imageList.get(1);
                secondImage.addStyleName("threeImageStack");
                lastImage = imageList.get(2);
                break;
            case 4:
                firstImage = imageList.get(0);
                secondImage = imageList.get(1);
                secondLastImage = imageList.get(2);
                lastImage = imageList.get(3);
                secondLastImage.addStyleName("fourImageStack");
                break;
            case 5:
                firstImage = imageList.get(0);
                secondImage = imageList.get(1);
                middleImage = imageList.get(thumbnailListSize / 2);
                secondLastImage = imageList.get(thumbnailListSize - 2);
                lastImage = imageList.get(thumbnailListSize - 1);
                break;
            }
            addThumbnailStyle(firstImage, "thumbnailFirstImage");
            addThumbnailStyle(secondImage, "thumbnailSecondImage");
            addThumbnailStyle(middleImage, "thumbnailMiddleImage");
            addThumbnailStyle(secondLastImage, "thumbnailSecondLastImage");
            addThumbnailStyle(lastImage, "thumbnailLastImage");
        }
    }

    private void addThumbnailStyle(Image thumbnailImage, String styleName) {
        if (null != thumbnailImage && !StringUtil.isNullOrEmpty(styleName)) {
            thumbnailImage.addStyleName(styleName);
            thumbnailImage.addMouseDownHandler(new MouseDownHandler() {

                @Override
                public void onMouseDown(MouseDownEvent event) {
                    event.preventDefault();
                }
            });
            this.add(thumbnailImage);
            thumbnailImage.addStyleName("stackImage");
            this.getElement().setDraggable(Element.DRAGGABLE_FALSE);
        }
    }

    public void addImage(Image imageToAdd) {
        if (null != imageToAdd) {
            imageList.add(imageToAdd);
        }
    }
}