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 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.

 *

 */

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;

  }-*/;

}