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.rest.GetCommand;

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

import java.util.List;

import com.google.gwt.core.client.GWT;

import com.google.gwt.dom.client.NativeEvent;

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

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

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

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

import com.google.gwt.user.client.Event.NativePreviewEvent;

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

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

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

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

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

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

/**

 * Abstract class, parent of all 'File properties' dialog boxes.

 *

 * @author droutsis

 */

public abstract class AbstractPropertiesDialog extends DialogBox {

        protected static final String MULTIPLE_VALUES_TEXT = "(Multiple values)";

        /**

         * Text box with the tags associated with the file

         */

        protected TextBox tags = new TextBox();

        protected String initialTagText;

        /**

         * A FlowPanel with all user tags

         */

        protected FlowPanel allTagsContent;

        protected TabPanel inner = null;

        /**

         * The widget's constructor.

         *

         */

        public AbstractPropertiesDialog() {

                // Enable IE selection for the dialog (must disable it upon closing it)

                GSS.enableIESelection();

                setAnimationEnabled(true);

        }

        /**

         * Retrieves all user tags from the server and updates the FlowPanel

         *

         * @param userId

         */

        protected void updateTags() {

                GetCommand<TagsResource> tc = new GetCommand<TagsResource>(TagsResource.class, GSS.get().getCurrentUserResource().getTagsPath(),null) {

                        @Override

                        public void onComplete() {

                                allTagsContent.clear();

                                TagsResource tagr = getResult();

                                List<String> userTags = tagr.getTags();

                                Anchor tag = null;

                                for(String usrTag : userTags){

                                        tag = new Anchor(usrTag.toString(), false);

                                        tag.addStyleName("gss-tag");

                                        allTagsContent.add(tag);

                                        Label separator = new Label(", ");

                                        separator.addStyleName("gss-tag");

                                        allTagsContent.add(separator);

                                        tag.addClickHandler( new ClickHandler() {

                                                @Override

                                                public void onClick(ClickEvent event) {

                                                        String existing = tags.getText();

                                                        if (MULTIPLE_VALUES_TEXT.equals(existing)) existing = "";

                                                        String newTag = ((Anchor) event.getSource()).getText().trim();

                                                        // insert the new tag only if it is not in the list

                                                        // already

                                                        if (existing.indexOf(newTag) == -1 && !existing.trim().endsWith(newTag))

                                                                tags.setText(existing.trim()

                                                                                        + (existing.length() > 0 ? ", " : "")

                                                                                        + newTag);

                                                }

                                        });

                                }

                        }

                        @Override

                        public void onError(Throwable t) {

                                GWT.log("", t);

                                GSS.get().displayError("Unable to fetch user tags");

                        }

                };

                DeferredCommand.addCommand(tc);

        }

        /**

         * Accepts any change and updates the file

         *

         */

        protected abstract void accept();

        @Override

        @SuppressWarnings("fallthrough")

        protected void onPreviewNativeEvent(NativePreviewEvent preview) {

            super.onPreviewNativeEvent(preview);

            NativeEvent evt = preview.getNativeEvent();

            if (evt.getType().equals("keydown"))

                        // Use the popup's key preview hooks to close the dialog when either

                          // enter or escape is pressed.

                          switch (evt.getKeyCode()) {

                            case KeyCodes.KEY_ENTER:

                                    accept();

                            case KeyCodes.KEY_ESCAPE:

                              closeDialog();

                              break;

                          }

          }

        public void selectTab(int _tab) {

                inner.selectTab(_tab);

        }

        /**

         * Enables IE selection prevention and hides the dialog

         * (we disable the prevention on creation of the dialog)

         */

        public void closeDialog() {

                GSS.preventIESelection();

                hide();

        }

}