com.elphel.vdt.ui.preferences.LabelFieldEditor.java Source code

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Here is the source code for com.elphel.vdt.ui.preferences.LabelFieldEditor.java

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/*******************************************************************************
 * Copyright (c) 2014 Elphel, Inc.
 * Copyright (c) 2006 Elphel, Inc and Excelsior, LLC.
 * This file is a part of VDT plug-in.
 * VDT plug-in 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.
 *
 * VDT plug-in 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 *  Additional permission under GNU GPL version 3 section 7:
 * If you modify this Program, or any covered work, by linking or combining it
 * with Eclipse or Eclipse plugins (or a modified version of those libraries),
 * containing parts covered by the terms of EPL/CPL, the licensors of this
 * Program grant you additional permission to convey the resulting work.
 * {Corresponding Source for a non-source form of such a combination shall
 * include the source code for the parts of Eclipse or Eclipse plugins used
 * as well as that of the covered work.}
 *******************************************************************************/
package com.elphel.vdt.ui.preferences;

import org.eclipse.jface.preference.FieldEditor;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;

/**
 * A field editor for displaying labels not associated with other widgets.
 */

public class LabelFieldEditor extends FieldEditor {

    private Label label;

    // All labels can use the same preference name since they don't
    // store any preference.
    public LabelFieldEditor(Composite parent, String value) {
        super("label", value, parent);
    }

    // Adjusts the field editor to be displayed correctly
    // for the given number of columns.
    protected void adjustForNumColumns(int numColumns) {
        ((GridData) label.getLayoutData()).horizontalSpan = numColumns;
    }

    // Fills the field editor's controls into the given parent.
    protected void doFillIntoGrid(Composite parent, int numColumns) {
        label = getLabelControl(parent);

        GridData gridData = new GridData();
        gridData.horizontalSpan = numColumns;
        gridData.horizontalAlignment = GridData.FILL;
        gridData.grabExcessHorizontalSpace = false;
        gridData.verticalAlignment = GridData.CENTER;
        gridData.grabExcessVerticalSpace = false;

        label.setLayoutData(gridData);
    }

    // Returns the number of controls in the field editor.
    public int getNumberOfControls() {
        return 1;
    }

    // Labels do not persist any preferences, so these methods are empty.
    protected void doLoad() {
    }

    protected void doLoadDefault() {
    }

    protected void doStore() {
    }

} // class LabelFieldEditor