fr.liglab.adele.cilia.workbench.monitoring.changesview.ChangesTableViewer.java Source code

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Here is the source code for fr.liglab.adele.cilia.workbench.monitoring.changesview.ChangesTableViewer.java

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/**
 * Copyright Universite Joseph Fourier (www.ujf-grenoble.fr)
 * 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 fr.liglab.adele.cilia.workbench.monitoring.changesview;

import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.TableViewerColumn;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;

/**
 * The table viewer, used in the changes view.
 * This class is a singleton. Only one viewer can be created.
 * @author Etienne Gandrille
 */
public class ChangesTableViewer {

    /** The viewer itself. */
    private static TableViewer viewer = null;

    /** The table sorter. */
    private static ChangesTableSorterComparator tableSorter = new ChangesTableSorterComparator();

    private ChangesTableViewer() {
        // Constructor is not available.
    }

    /**
     * Gets the singleton viewer.
     *
     * @param parent the parent
     * @return the viewer
     */
    public static TableViewer getViewer(Composite parent) {
        if (viewer == null)
            createViewer(parent);
        return viewer;
    }

    /**
     * Creates the viewer.
     *
     * @param parent the parent
     */
    private static void createViewer(Composite parent) {
        viewer = new TableViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL | SWT.FULL_SELECTION | SWT.BORDER);
        viewer.setContentProvider(new ArrayContentProvider());

        viewer.setComparator(tableSorter);

        createColumnsAndLabelProvider(viewer);

        final Table table = viewer.getTable();
        table.setHeaderVisible(true);
        table.setLinesVisible(true);

        viewer.getControl().setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    }

    /**
     * Creates the columns and label provider.
     *
     * @param viewer the viewer
     */
    private static void createColumnsAndLabelProvider(final TableViewer viewer) {
        for (ChangesTableColumnHeader columnHeader : ChangesTableColumnHeader.values())
            createTableViewerColumn(viewer, columnHeader);
    }

    /**
     * Creates the table viewer column.
     *
     * @param viewer the viewer
     * @param columnHeader the column header
     * @return the table viewer column
     */
    private static TableViewerColumn createTableViewerColumn(TableViewer viewer,
            ChangesTableColumnHeader columnHeader) {
        final TableViewerColumn viewerColumn = new TableViewerColumn(viewer, SWT.NONE);
        viewerColumn.setLabelProvider(columnHeader.getCellLabelProvider());
        final TableColumn column = viewerColumn.getColumn();
        column.setText(columnHeader.getColumnName());
        column.setWidth(100);
        column.setResizable(true);
        column.setMoveable(true);
        column.addSelectionListener(getSelectionAdapter(column, columnHeader));
        return viewerColumn;
    }

    /**
     * Gets the selection adapter.
     *
     * @param column the column
     * @param columnHeader the column header
     * @return the selection adapter
     */
    private static SelectionAdapter getSelectionAdapter(final TableColumn column,
            final ChangesTableColumnHeader columnHeader) {
        SelectionAdapter selectionAdapter = new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                tableSorter.setColumn(columnHeader);
                viewer.refresh();
            }
        };
        return selectionAdapter;
    }
}