AlignableTab.java

/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.examples.controlexample;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Widget;

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

	/* Alignment Group */
	Group	alignmentGroup;

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

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

	/**
	 * Creates the "Other" group.
	 */
	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 = new SelectionAdapter() {
			public void widgetSelected(SelectionEvent 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.
	 */
	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);
		}
	}
}