Synnefo » Pithos

/*

 * Copyright 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.grnet.pithos.web.client;

import java.util.List;

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

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

/**

 * A helper class with static methods that manipulate display

 * widgets in various useful ways, not available in GWT.

 *

 * @author past

 */

public class DisplayHelper {

        /**

         * A flag that denotes that no selection should be made while

         * displaying the rows of a table.

         */

        public static final int NO_SELECTION = -1;

        /**

         * Clear any current selection in the specified ListBox.

         */

        public static void clearSelections(ListBox listBox) {

                for (int i=0; i<listBox.getItemCount(); i++)

                        if (listBox.isItemSelected(i))

                                listBox.setItemSelected(i, false);

        }

        /**

         * Select the item in the listBox whose value matches the provided

         * value.

         */

        public static void selectMatch(ListBox listBox, String value) {

                for (int i=0; i<listBox.getItemCount(); i++)

                        if (listBox.getValue(i).equals(value))

                                listBox.setItemSelected(i, true);

                        else

                                listBox.setItemSelected(i, false);

        }

        /**

         * Select the items in the listBox whose value matches the provided

         * value list. Every value that is matched in the listBox is removed

         * from the value list, in order to let the caller know what values

         * were not matched. Therefore the caller must be prepared for the

         * value list to be modified.

         *

         * @param listBox the ListBox

         * @param values the list of values to be selected

         */

        public static void selectMultiMatch(ListBox listBox, List values) {

                for (int i=0; i<listBox.getItemCount(); i++)

                        if (values.contains(listBox.getValue(i))) {

                                listBox.setItemSelected(i, true);

                                values.remove(listBox.getValue(i));

                        } else

                                listBox.setItemSelected(i, false);

        }

        public static native void log(String message) /*-{

                var logger = $wnd.console;

                  if (logger && logger.debug)

                        logger.debug(message);

                else if (logger && logger.log)

                        logger.log(message);

        }-*/;

        /**

         * Make the specified row look like selected or not, according to the

         * <code>selected</code> flag.

         *

         * @param row the row number in the list of entries (i.e. ignoring the header line)

         * @param selected the flag that denotes whether the <code>styleName</code> should

         *                                 be added or removed

         * @param styleName the name of the CSS style

         */

        public static void styleRow(final FlexTable table, final int row, final boolean selected, String styleName) {

                if (row != -1)

                        if (selected)

                                table.getRowFormatter().addStyleName(row + 1, styleName);

                        else

                                table.getRowFormatter().removeStyleName(row + 1, styleName);

        }

        /**

         * Select the specified row in the table. This entails modifying its style

         * as well as the style of the previously selected row.

         *

         * @param table the FlexTable widget

         * @param row the newly selected row

         * @param previousRow the previously selected row

         * @param styleName the name of the CSS style

         * @return the newly selected row

         */

        public static int selectRow(final FlexTable table, final int row, final int previousRow, String styleName) {

                // Reset the style of the previously selected row.

                styleRow(table, previousRow, false, styleName);

                // Select the row that was clicked.

                styleRow(table, row, true, styleName);

                return row;

        }

        /**

         * The implementation of this trim method also checks for

         * no brake space characters (nbsp) = '\00A0'

         * and removes them

         *

         * @param input

         * @return the new trimmed string without whitespace or no brake space

         */

        public static native String trim(String input) /*-{

    if(input.length == 0)

            return input;

        if((input[0]||input[input.length-1]) != '\u0020' && (input[0]||input[input.length-1]) != '\u00A0')

            return input;

    var r1 = input.replace(/^(\s*)/, '');

    var r2 = r1.replace(/\s*$/, '');

    return r2;

  }-*/;

}