com.windowtester.runtime.swt.internal.preferences.LabelFieldEditor.java Source code

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Here is the source code for com.windowtester.runtime.swt.internal.preferences.LabelFieldEditor.java

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/*******************************************************************************
 *  Copyright (c) 2012 Google, Inc.
 *  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
 *  
 *  Contributors:
 *  Google, Inc. - initial API and implementation
 *******************************************************************************/
package com.windowtester.runtime.swt.internal.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.
 * 
 * Taken from: http://www.eclipse.org/articles/Article-Field-Editors/field_editors.html
 */
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(String value, Composite parent) {
        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() {
    }
}