org.gss_project.gss.web.client.AbstractPropertiesDialog.java Source code

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Here is the source code for org.gss_project.gss.web.client.AbstractPropertiesDialog.java

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/*
 * 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 org.gss_project.gss.web.client;

import org.gss_project.gss.web.client.rest.GetCommand;
import org.gss_project.gss.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.
 *
 * @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();
    }

}