Synnefo » Pithos

/*

 * Copyright 2008, 2009 Electronic Business Systems Ltd.

 *

 * This file is part of GSS.

 *

 * GSS is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * GSS 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 GSS.  If not, see <http://www.gnu.org/licenses/>.

 */

package gr.ebs.gss.client.tree;

import gr.ebs.gss.client.PopupTree;

import gr.ebs.gss.client.Folders.Images;

import gr.ebs.gss.client.dnd.DnDTreeItem;

import gr.ebs.gss.client.rest.resource.FolderResource;

import java.util.LinkedList;

import java.util.List;

import com.google.gwt.user.client.ui.AbstractImagePrototype;

import com.google.gwt.user.client.ui.HTML;

import com.google.gwt.user.client.ui.TreeItem;

/**

 * @author kman

 */

public abstract class Subtree {

        protected PopupTree tree;

        final Images images;

        public Subtree(PopupTree tree, final Images _images) {

                images = _images;

                this.tree = tree;

        }

        /**

         * A helper method to simplify adding tree items that have attached images.

         * {@link #addImageItem(TreeItem, String) code}

         *

         * @param parent the tree item to which the new item will be added.

         * @param title the text associated with this item.

         * @param imageProto the image of the item

         * @return

         */

        protected TreeItem addImageItem(final TreeItem parent, final String title, final AbstractImagePrototype imageProto, boolean draggable) {

                final DnDTreeItem item = new DnDTreeItem(imageItemHTML(imageProto, title), title, draggable);

                parent.addItem(item);

                return item;

        }

        /**

         * Generates HTML for a tree item with an attached icon.

         *

         * @param imageProto the image icon

         * @param title the title of the item

         * @return the resultant HTML

         */

        protected HTML imageItemHTML(final AbstractImagePrototype imageProto, final String title) {

                HTML html = new HTML("<a class='hidden-link' href='javascript:;'><span >" + imageProto.getHTML() + "&nbsp;" + title + "</span></a>");

                return html;

        }

        public void updateSubFoldersLazily(DnDTreeItem folderItem, List<FolderResource> subfolders, AbstractImagePrototype image) {

                for (int i = 0; i < folderItem.getChildCount(); i++) {

                        DnDTreeItem c = (DnDTreeItem) folderItem.getChild(i);

                        FolderResource f = (FolderResource) c.getUserObject();

                        if (!listContainsFolder(f, subfolders)) {

                                c.undoDraggable();

                                folderItem.removeItem(c);

                        }

                }

                LinkedList<DnDTreeItem> itemList = new LinkedList();

                for (FolderResource subfolder : subfolders) {

                        DnDTreeItem item = folderItem.getChild(subfolder);

                        if (item == null)

                                item = (DnDTreeItem) addImageItem(folderItem, subfolder.getName(), image, true);

                        else

                                item.updateWidget(imageItemHTML(image, subfolder.getName()));

                        item.setUserObject(subfolder);

                        itemList.add(item);

                }

                for (DnDTreeItem it : itemList)

                        it.remove();

                for (DnDTreeItem it : itemList)

                        folderItem.addItem(it);

                for (int i = 0; i < folderItem.getChildCount(); i++) {

                        DnDTreeItem c = (DnDTreeItem) folderItem.getChild(i);

                        c.doDraggable();

                        FolderResource f = (FolderResource) c.getUserObject();

                }

        }

        private boolean listContainsFolder(FolderResource folder, List<FolderResource> subfolders) {

                for (FolderResource f : subfolders)

                        if (f.getUri().equals(folder.getUri()))

                                return true;

                return false;

        }

}