Synnefo

/*

 * Copyright 2011 GRNET S.A. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

 * conditions are met:

 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. Redistributions in binary form must reproduce the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer in the documentation and/or other materials

 *      provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * The views and conclusions contained in the software and

 * documentation are those of the authors and should not be

 * interpreted as representing official policies, either expressed

 * or implied, of GRNET S.A.

 */

package gr.grnet.pithos.web.client;

import gr.grnet.pithos.web.client.rest.GetCommand;

import gr.grnet.pithos.web.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.

 *

 */

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("pithos-tag");

                                        allTagsContent.add(tag);

                                        Label separator = new Label(", ");

                                        separator.addStyleName("pithos-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();

        }

}