org.eclipse.swt.examples.controlexample.AlignableTab.java Source code

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Here is the source code for org.eclipse.swt.examples.controlexample.AlignableTab.java

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/*******************************************************************************
 * Copyright (c) 2000, 2013 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.examples.controlexample;

import static org.eclipse.swt.events.SelectionListener.widgetSelectedAdapter;

import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.events.*;

/**
 * <code>AlignableTab</code> is the abstract
 * superclass of example controls that can be
 * aligned.
 */
abstract class AlignableTab extends Tab {

    /* Alignment Controls */
    Button leftButton, rightButton, centerButton;

    /* Alignment Group */
    Group alignmentGroup;

    /**
     * Creates the Tab within a given instance of ControlExample.
     */
    AlignableTab(ControlExample instance) {
        super(instance);
    }

    /**
     * Creates the "Other" group.
     */
    @Override
    void createOtherGroup() {
        super.createOtherGroup();

        /* Create the group */
        alignmentGroup = new Group(otherGroup, SWT.NONE);
        alignmentGroup.setLayout(new GridLayout());
        alignmentGroup.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_FILL));
        alignmentGroup.setText(ControlExample.getResourceString("Alignment"));

        /* Create the controls */
        leftButton = new Button(alignmentGroup, SWT.RADIO);
        leftButton.setText(ControlExample.getResourceString("Left"));
        centerButton = new Button(alignmentGroup, SWT.RADIO);
        centerButton.setText(ControlExample.getResourceString("Center"));
        rightButton = new Button(alignmentGroup, SWT.RADIO);
        rightButton.setText(ControlExample.getResourceString("Right"));

        /* Add the listeners */
        SelectionListener selectionListener = widgetSelectedAdapter(event -> {
            if (!((Button) event.widget).getSelection())
                return;
            setExampleWidgetAlignment();
        });
        leftButton.addSelectionListener(selectionListener);
        centerButton.addSelectionListener(selectionListener);
        rightButton.addSelectionListener(selectionListener);
    }

    /**
     * Sets the alignment of the "Example" widgets.
     */
    abstract void setExampleWidgetAlignment();

    /**
     * Sets the state of the "Example" widgets.
     */
    @Override
    void setExampleWidgetState() {
        super.setExampleWidgetState();
        Widget[] widgets = getExampleWidgets();
        if (widgets.length != 0) {
            leftButton.setSelection((widgets[0].getStyle() & SWT.LEFT) != 0);
            centerButton.setSelection((widgets[0].getStyle() & SWT.CENTER) != 0);
            rightButton.setSelection((widgets[0].getStyle() & SWT.RIGHT) != 0);
        }
    }
}