Synnefo » Pithos

/*

 * Copyright 2007, 2008, 2009, 2010 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.RefreshCommand;

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

import gr.ebs.gss.client.rest.RestCommand;

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

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

import java.util.List;

import com.google.gwt.event.dom.client.ClickEvent;

import com.google.gwt.event.dom.client.ClickHandler;

import com.google.gwt.http.client.URL;

import com.google.gwt.resources.client.ClientBundle;

import com.google.gwt.resources.client.ImageResource;

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

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

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

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

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

/**

 * The 'File' menu implementation.

 */

public class FileMenu extends PopupPanel implements ClickHandler {

        /**

         * The widget's images.

         */

        private final Images images;

        /**

         * An image bundle for this widgets images.

         */

        public interface Images extends ClientBundle,FilePropertiesDialog.Images {

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

                ImageResource folderNew();

                @Source("gr/ebs/gss/resources/folder_outbox.png")

                ImageResource fileUpdate();

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

                ImageResource viewText();

                @Override

                @Source("gr/ebs/gss/resources/folder_inbox.png")

                ImageResource download();

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

                ImageResource emptyTrash();

                @Source("gr/ebs/gss/resources/internet.png")

                ImageResource sharing();

                @Source("gr/ebs/gss/resources/refresh.png")

                ImageResource refresh();

}

        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;

                add(contextMenu);

        }

        @Override

        public void onClick(ClickEvent event) {

                final FileMenu menu = new FileMenu(images);

                final int left = event.getRelativeElement().getAbsoluteLeft();

                final int top = event.getRelativeElement().getAbsoluteTop() + event.getRelativeElement().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 FileResource)) {

                        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

         * @param forceDownload If true, link will be such that browser should ask for filename

         *                                 and save location

         */

        void createDownloadLink(String[] link, boolean forceDownload) {

                String downloadURL = getDownloadURL();

                if (!downloadURL.isEmpty()) {

                        link[0] = "<a class='hidden-link' href='" + downloadURL

                                        + (forceDownload ? "&dl=1" : "") + "' target='_blank'>";

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

                }

        }

        public String getDownloadURL() {

                GSS app = GSS.get();

                Object selection = app.getCurrentSelection();

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

                        FileResource file = (FileResource) selection;

                        return getDownloadURL(file);

                }

                return "";

        }

        public String getDownloadURL(FileResource file) {

                GSS app = GSS.get();

                if (file != null) {

                        String dateString = RestCommand.getDate();

                        String resource = file.getUri().substring(app.getApiPath().length()-1,file.getUri().length());

                        String sig = app.getCurrentUserResource().getUsername()+" "+RestCommand.calculateSig("GET", dateString, resource, RestCommand.base64decode(app.getToken()));

                        return file.getUri() + "?Authorization=" + URL.encodeComponent(sig) + "&Date="+URL.encodeComponent(dateString);

                }

                return "";

        }

        public MenuBar createMenu() {

                contextMenu.clearItems();

                contextMenu.setAutoOpen(false);

                final Command downloadCmd = new Command() {

                        @Override

                        public void execute() {

                                hide();

                                preDownloadCheck();

                        }

                };

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

                TreeItem selectedItem = folders.getCurrent();

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

                boolean propertiesVisible = !(selectedItem != null && (folders.isTrash(selectedItem) || folders.isMyShares(selectedItem) || folders.isOthersShared(selectedItem) || selectedItem.getUserObject() instanceof GroupUserResource || GSS.get().getCurrentSelection() instanceof List));

                boolean newFolderVisible = !(selectedItem != null && (folders.isTrash(selectedItem) || folders.isTrashItem(selectedItem) || folders.isMyShares(selectedItem)|| folders.isOthersShared(selectedItem)));

                boolean uploadVisible = !(selectedItem != null && (folders.isTrash(selectedItem) || folders.isTrashItem(selectedItem)|| folders.isMyShares(selectedItem)|| folders.isOthersShared(selectedItem)));

                if(newFolderVisible)

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

                if(uploadVisible)

                        contextMenu.addItem("<span>" + AbstractImagePrototype.create(images.fileUpdate()).getHTML() + "&nbsp;Upload</span>", true, new UploadFileCommand(this));

                if (downloadVisible) {

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

                        createDownloadLink(link, false);

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

                        createDownloadLink(link, true);

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

                }

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

                contextMenu.addItem("<span>" + AbstractImagePrototype.create(images.refresh()).getHTML() + "&nbsp;Refresh</span>", true, new RefreshCommand(this, images));

                contextMenu.addItem("<span>" + AbstractImagePrototype.create(images.sharing()).getHTML() + "&nbsp;Sharing</span>", true, new PropertiesCommand(this, images, 1))

                                           .setVisible(propertiesVisible);

                contextMenu.addItem("<span>" + AbstractImagePrototype.create(images.viewText()).getHTML() + "&nbsp;Properties</span>", true, new PropertiesCommand(this, images, 0))

                                           .setVisible(propertiesVisible);

                return contextMenu;

        }

}