org.csstudio.alarm.beast.msghist.TableColumnsFieldEditor.java Source code

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Here is the source code for org.csstudio.alarm.beast.msghist.TableColumnsFieldEditor.java

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/*******************************************************************************
 * Copyright (c) 2010 Oak Ridge National Laboratory.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 ******************************************************************************/
package org.csstudio.alarm.beast.msghist;

import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;

import org.csstudio.ui.util.swt.stringtable.StringTableEditor;
import org.eclipse.jface.preference.FieldEditor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;

/** Preference dialog field editor for property columns
 *  @author Kay Kasemir
 */
public class TableColumnsFieldEditor extends FieldEditor {
    private List<String> columns;
    private Label label;
    private StringTableEditor editor;

    /** Initialize
     *  @param parent Parent Widget
     */
    public TableColumnsFieldEditor(Composite parent) {
        super(Preferences.COLUMNS, Messages.TableColumnsEditor_Title, parent);
    }

    /** Indicate that we need at least one column */
    @Override
    public int getNumberOfControls() {
        return 1;
    }

    /** {@inheritDoc} */
    @Override
    protected void adjustForNumColumns(int numColumns) {
        GridData gd = (GridData) label.getLayoutData();
        gd.horizontalSpan = numColumns;
        gd = (GridData) editor.getLayoutData();
        gd.horizontalSpan = numColumns;
    }

    /** {@inheritDoc} */
    @Override
    protected void doFillIntoGrid(Composite parent, int numColumns) {
        label = new Label(parent, 0);
        label.setText(Messages.TableColumnsEditor_Columns);
        GridData gd = new GridData();
        gd.horizontalSpan = numColumns;
        label.setLayoutData(gd);

        columns = new ArrayList<String>();
        editor = new StringTableEditor(parent, columns);
        editor.setToolTipText(Messages.TableColumnsEditor_TT);
        gd = new GridData();
        gd.horizontalSpan = numColumns;
        gd.grabExcessHorizontalSpace = true;
        gd.grabExcessVerticalSpace = true;
        gd.horizontalAlignment = SWT.FILL;
        gd.verticalAlignment = SWT.FILL;
        editor.setLayoutData(gd);
    }

    /** {@inheritDoc} */
    @SuppressWarnings("nls")
    @Override
    protected void doLoad() {
        try {
            final String[] column_prefs = Preferences.getColumnPreferences();
            updateColumnPrefs(column_prefs);
        } catch (Exception ex) {
            Activator.getLogger().log(Level.WARNING, "Preference Load error", ex);
        }
    }

    /** {@inheritDoc} */
    @Override
    protected void doLoadDefault() {
        final String pref_text = getPreferenceStore().getDefaultString(getPreferenceName());
        final String[] column_prefs = Preferences.decodeRawColumnPreferences(pref_text);
        updateColumnPrefs(column_prefs);
    }

    /** Update the column preferences shown in the GUI
     *  @param column_prefs Column prefs to show
     */
    private void updateColumnPrefs(final String[] column_prefs) {
        columns.clear();
        for (String pref : column_prefs)
            columns.add(pref);
        editor.refresh();
    }

    /** {@inheritDoc} */
    @Override
    protected void doStore() {
        final String pref_text = Preferences
                .encodeRawColumnPrefs((String[]) columns.toArray(new String[columns.size()]));
        getPreferenceStore().setValue(getPreferenceName(), pref_text);
    }
}