com.risevision.ui.client.common.dnd.FlexTableUtil.java Source code

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Here is the source code for com.risevision.ui.client.common.dnd.FlexTableUtil.java

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/*
 * Copyright 2009 Fred Sauer
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.risevision.ui.client.common.dnd;

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

/**
 * Utility class to manipulate {@link FlexTable FlexTables}.
 */
public class FlexTableUtil {

    /**
     * Copy an entire FlexTable from one FlexTable to another. Each element is copied by creating a
     * new {@link HTML} widget by calling {@link FlexTable#getHTML(int, int)} on the source table.
     * 
     * @param sourceTable the FlexTable to copy a row from
     * @param targetTable the FlexTable to copy a row to
     * @param sourceRow the index of the source row
     * @param targetRow the index before which to insert the copied row
     */
    public static void copyRow(FlexTable sourceTable, FlexTable targetTable, int sourceRow, int targetRow) {
        targetTable.insertRow(targetRow);
        for (int col = 0; col < sourceTable.getCellCount(sourceRow); col++) {
            HTML html = new HTML(sourceTable.getHTML(sourceRow, col));
            targetTable.setWidget(targetRow, col, html);
        }
        copyRowStyle(sourceTable, targetTable, sourceRow, targetRow);
    }

    /**
     * Move an entire FlexTable from one FlexTable to another. Elements are moved by attempting to
     * call {@link FlexTable#getWidget(int, int)} on the source table. If no widget is found (because
     * <code>null</code> is returned), a new {@link HTML} is created instead by calling
     * {@link FlexTable#getHTML(int, int)} on the source table.
     * 
     * @param sourceTable the FlexTable to move a row from
     * @param targetTable the FlexTable to move a row to
     * @param sourceRow the index of the source row
     * @param targetRow the index before which to insert the moved row
     */
    public static void moveRow(FlexTable sourceTable, FlexTable targetTable, int sourceRow, int targetRow) {
        if (sourceTable == targetTable && sourceRow >= targetRow) {
            sourceRow++;
        }
        targetTable.insertRow(targetRow);
        for (int col = 0; col < sourceTable.getCellCount(sourceRow); col++) {
            Widget w = sourceTable.getWidget(sourceRow, col);
            if (w != null) {
                targetTable.setWidget(targetRow, col, w);
            } else {
                HTML html = new HTML(sourceTable.getHTML(sourceRow, col));
                targetTable.setWidget(targetRow, col, html);
            }
            copyCellStyle(sourceTable, targetTable, sourceRow, col, targetRow, col);
        }
        copyRowStyle(sourceTable, targetTable, sourceRow, targetRow);
        sourceTable.removeRow(sourceRow);
    }

    /**
     * Copies the CSS style of a source row to a target row.
     * 
     * @param sourceTable
     * @param targetTable
     * @param sourceRow
     * @param targetRow
     */
    private static void copyRowStyle(FlexTable sourceTable, FlexTable targetTable, int sourceRow, int targetRow) {
        String rowStyle = sourceTable.getRowFormatter().getStyleName(sourceRow);
        targetTable.getRowFormatter().setStyleName(targetRow, rowStyle);
    }

    /**
     * Copies the CSS style of a source cell to a target cell.
     * 
     * @param sourceTable
     * @param targetTable
     * @param sourceRow
     * @param targetRow
     */
    private static void copyCellStyle(FlexTable sourceTable, FlexTable targetTable, int sourceRow, int sourceCol,
            int targetRow, int targetCol) {
        String cellStyle = sourceTable.getCellFormatter().getStyleName(sourceRow, sourceCol);
        targetTable.getCellFormatter().setStyleName(targetRow, targetCol, cellStyle);
    }

}