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 com.google.gwt.event.dom.client.BlurEvent;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/**

 * A component that contains the search form.

 */

public class Search extends Composite implements FocusHandler,BlurHandler {

        /**

         * The text hint that is displayed in the empty search box.

         */

        private static final String TEXT_HINT = "Search for files...";

        /**

         * Specifies the images that will be bundled for this Composite.

         */

        public interface Images extends ClientBundle {

                @Source("gr/ebs/gss/resources/search_16.png")

                ImageResource searchButton();

        }

        /**

         * The embedded text box widget that contains the search query.

         */

        private TextBox tb = new TextBox();

        /**

         * The search widget constructor.

         *

         * @param images the image bundle

         */

        public Search(final Images images) {

                tb.setWidth("200px");

                tb.setText(TEXT_HINT);

                tb.setStylePrimaryName("gss-search");

                tb.addStyleDependentName("empty");

                tb.addFocusHandler(this);

                tb.addBlurHandler(this);

                tb.addKeyPressHandler(new KeyPressHandler() {

                        @Override

                        public void onKeyPress(KeyPressEvent event) {

                                char keyCode = event.getCharCode();

                                if (keyCode == '\r')

                                        GSS.get().showSearchResults(tb.getText());

                                else if (keyCode == 27) {

                                        // Simulate the proper behavior for the escape key

                                        // (27 == ESC).

                                        onLostFocus((Widget)event.getSource());

                                        tb.setFocus(false);

                                }

                        }

                });

                Button b = new Button(createHeaderHTML(images.searchButton(), "Search"), new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                GSS.get().showSearchResults(tb.getText());

                        }

                });

                HorizontalPanel panel = new HorizontalPanel();

                panel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);

                panel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);

                panel.add(tb);

                panel.add(b);

                initWidget(panel);

        }

        /**

         * Creates an HTML fragment that places an image & caption together.

         *

         * @param imageProto an image prototype for an image

         * @param caption the caption

         * @return the HTML fragment

         */

        private String createHeaderHTML(ImageResource imageProto, String caption) {

                String captionHTML = "<table cellpadding='0' cellspacing='0'>" + "<tr><td>" +

                AbstractImagePrototype.create(imageProto).getHTML() + "</td><td style='font-size: 90%;'>&nbsp;" +

                        caption + "</td></tr></table>";

                return captionHTML;

        }

        public void onLostFocus(Widget sender) {

                TextBox b = (TextBox) sender;

                if (b.getText().equals("")) {

                        b.addStyleDependentName("empty");

                        b.setText(TEXT_HINT);

                }

        }

        @Override

        public void onFocus(FocusEvent event) {

                TextBox b = (TextBox) event.getSource();

                if (b.getText().equals(TEXT_HINT))

                        b.setText("");

                b.removeStyleDependentName("empty");

        }

        @Override

        public void onBlur(BlurEvent event) {

                TextBox b = (TextBox) event.getSource();

                onLostFocus(b);

        }

}