Synnefo

/*

 * Copyright 2007, 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;

import gr.ebs.gss.client.commands.EmptyTrashCommand;

import gr.ebs.gss.client.commands.NewFolderCommand;

import gr.ebs.gss.client.commands.PropertiesCommand;

import gr.ebs.gss.client.commands.UpdateFileCommand;

import gr.ebs.gss.client.commands.UploadFileCommand;

import gr.ebs.gss.client.domain.FileHeaderDTO;

import gr.ebs.gss.client.domain.UserDTO;

import com.google.gwt.user.client.Command;

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

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

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

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

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

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

/**

 * The 'File' menu implementation.

 */

public class FileMenu extends PopupPanel implements ClickListener {

        /**

         * The path info portion of the URL that provides the file download service.

         */

        static final String FILE_DOWNLOAD_PATH = "/gss/fileDownload";

        /**

         * The widget's images.

         */

        private final Images images;

        /**

         * An image bundle for this widgets images.

         */

        public interface Images extends FilePropertiesDialog.Images {

                /**

                 * Will bundle the file 'folder_new.png' residing in the package

                 * 'gr.ebs.gss.resources'.

                 *

                 * @return the image prototype

                 */

                @Resource("gr/ebs/gss/resources/folder_new.png")

                AbstractImagePrototype folderNew();

                /**

                 * Will bundle the file 'filenew.png' residing in the package

                 * 'gr.ebs.gss.resources'.

                 *

                 * @return the image prototype

                 */

                @Resource("gr/ebs/gss/resources/filenew.png")

                AbstractImagePrototype fileNew();

                /**

                 * Will bundle the file 'update.png' residing in the package

                 * 'gr.ebs.gss.resources'.

                 *

                 * @return the image prototype

                 */

                @Resource("gr/ebs/gss/resources/update.png")

                AbstractImagePrototype fileUpdate();

                /**

                 * Will bundle the file 'view_text.png' residing in the package

                 * 'gr.ebs.gss.resources'.

                 *

                 * @return the image prototype

                 */

                @Resource("gr/ebs/gss/resources/view_text.png")

                AbstractImagePrototype viewText();

                /**

                 * Will bundle the file 'download_manager.png' residing in the package

                 * 'gr.ebs.gss.resources'.

                 *

                 * @return the image prototype

                 */

                @Resource("gr/ebs/gss/resources/download_manager.png")

                AbstractImagePrototype download();

                /**

                 * Will bundle the file 'trashcan_empty.png' residing in the package

                 * 'gr.ebs.gss.resources'.

                 *

                 * @return the image prototype

                 */

                @Resource("gr/ebs/gss/resources/trashcan_empty.png")

                AbstractImagePrototype emptyTrash();

        }

        final MenuBar contextMenu = new MenuBar(true);

        /**

         * The widget's constructor.

         *

         * @param _images the image bundle passed on by the parent object

         */

        public FileMenu(final Images _images) {

                // The popup's constructor's argument is a boolean specifying that it

                // auto-close itself when the user clicks outside of it.

                super(true);

                setAnimationEnabled(true);

                images = _images;

                // createMenu();

                add(contextMenu);

        }

        /*

         * (non-Javadoc)

         *

         * @see com.google.gwt.user.client.ui.ClickListener#onClick(com.google.gwt.user.client.ui.Widget)

         */

        public void onClick(final Widget sender) {

                final FileMenu menu = new FileMenu(images);

                final int left = sender.getAbsoluteLeft();

                final int top = sender.getAbsoluteTop() + sender.getOffsetHeight();

                menu.setPopupPosition(left, top);

                menu.show();

        }

        /**

         * Do some validation before downloading a file.

         */

        void preDownloadCheck() {

                Object selection = GSS.get().getCurrentSelection();

                if (selection == null || !(selection instanceof FileHeaderDTO)) {

                        GSS.get().displayError("You have to select a file first");

                        return;

                }

        }

        /**

         * Create a download link for the respective menu item, if the currently

         * selected object is a file.

         *

         * @param link a String array with two elements that is modified so that the

         *            first position contains the opening tag and the second one the

         *            closing tag

         */

        void createDownloadLink(String[] link) {

                Object selection = GSS.get().getCurrentSelection();

                if (selection != null && selection instanceof FileHeaderDTO) {

                        FileHeaderDTO file = (FileHeaderDTO) selection;

                        link[0] = "<a class='hidden-link' href='" + FileMenu.FILE_DOWNLOAD_PATH + "?userId=" + GSS.get().getCurrentUser().getId().toString() + "&fileId=" + file.getId() + "' target='_blank'>";

                        link[1] = "</a>";

                }

        }

        public MenuBar createMenu() {

                contextMenu.clearItems();

                contextMenu.setAutoOpen(false);

                final Command downloadCmd = new Command() {

                        public void execute() {

                                hide();

                                preDownloadCheck();

                        }

                };

                Folders folders = GSS.get().getFolders();

                TreeItem selectedItem = folders.getCurrent();

                boolean downloadVisible = GSS.get().getCurrentSelection() != null && GSS.get().getCurrentSelection() instanceof FileHeaderDTO;

                boolean propertiesNotVisible = selectedItem != null && (folders.isTrash(selectedItem) || folders.isMyShares(selectedItem) || folders.isOthersShared(selectedItem) || selectedItem.getUserObject() instanceof UserDTO);

                contextMenu.addItem("<span>" + images.folderNew().getHTML() + "&nbsp;New Folder</span>", true, new NewFolderCommand(this, images));

                contextMenu.addItem("<span>" + images.fileNew().getHTML() + "&nbsp;New File</span>", true, new UploadFileCommand(this));

                contextMenu        .addItem("<span>" + images.fileUpdate().getHTML() + "&nbsp;Update</span>", true, new UpdateFileCommand(this))

                .setVisible(!propertiesNotVisible);

                contextMenu        .addItem("<span>" + images.viewText().getHTML() + "&nbsp;Properties</span>", true, new PropertiesCommand(this, images))

                                        .setVisible(!propertiesNotVisible);

                contextMenu.addItem("<span>" + images.emptyTrash().getHTML() + "&nbsp;Empty Trash</span>", true, new EmptyTrashCommand(this));

                if (downloadVisible) {

                        String[] link = {"", ""};

                        createDownloadLink(link);

                        contextMenu.addItem("<span>" + link[0] + images.download().getHTML() + "&nbsp;Download File" + link[1] + "</span>", true, downloadCmd);

                }

                return contextMenu;

        }

}