core/plugins/org.eclipse.dltk.ui/src/org/eclipse/dltk/ui/formatter/FormatterIndentationGroup.java

/*******************************************************************************
 * Copyright (c) 2009, 2017 xored software, Inc.  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:
 *     xored software, Inc. - initial API and Implementation (Alex Panchenko)
 *******************************************************************************/
package org.eclipse.dltk.ui.formatter;

import org.eclipse.dltk.ui.CodeFormatterConstants;
import org.eclipse.dltk.ui.preferences.FormatterMessages;
import org.eclipse.dltk.ui.util.SWTFactory;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Text;

/**
 * @since 2.0
 */
public class FormatterIndentationGroup {

	private Combo tabPolicy;
	private Text indentSize;
	private Text tabSize;

	private final String[] tabPolicyItems = new String[] {
			CodeFormatterConstants.SPACE, CodeFormatterConstants.TAB,
			CodeFormatterConstants.MIXED };

	private class TabPolicyListener extends SelectionAdapter implements
			IFormatterControlManager.IInitializeListener {

		private final IFormatterControlManager manager;

		public TabPolicyListener(IFormatterControlManager manager) {
			this.manager = manager;
		}

		@Override
		public void widgetSelected(SelectionEvent e) {
			int index = tabPolicy.getSelectionIndex();
			if (index >= 0) {
				final boolean tabMode = CodeFormatterConstants.TAB
						.equals(tabPolicyItems[index]);
				manager.enableControl(indentSize, !tabMode);
			}
		}

		@Override
		public void initialize() {
			final boolean tabMode = CodeFormatterConstants.TAB.equals(manager
					.getString(CodeFormatterConstants.FORMATTER_TAB_CHAR));
			manager.enableControl(indentSize, !tabMode);
		}

	}

	private TabPolicyListener tabPolicyListener;

	public FormatterIndentationGroup(IFormatterControlManager manager,
			Composite parent) {
		Group tabPolicyGroup = SWTFactory.createGroup(parent,
				FormatterMessages.IndentationTabPage_generalSettings, 2, 1,
				GridData.FILL_HORIZONTAL);
		tabPolicy = manager
				.createCombo(
						tabPolicyGroup,
						CodeFormatterConstants.FORMATTER_TAB_CHAR,
						FormatterMessages.IndentationTabPage_general_group_option_tab_policy,
						tabPolicyItems,
						new String[] {
								FormatterMessages.IndentationTabPage_general_group_option_tab_policy_SPACE,
								FormatterMessages.IndentationTabPage_general_group_option_tab_policy_TAB,
								FormatterMessages.IndentationTabPage_general_group_option_tab_policy_MIXED });
		tabPolicyListener = new TabPolicyListener(manager);
		tabPolicy.addSelectionListener(tabPolicyListener);
		manager.addInitializeListener(tabPolicyListener);
		indentSize = manager
				.createNumber(
						tabPolicyGroup,
						CodeFormatterConstants.FORMATTER_INDENTATION_SIZE,
						FormatterMessages.IndentationTabPage_general_group_option_indent_size);
		tabSize = manager
				.createNumber(
						tabPolicyGroup,
						CodeFormatterConstants.FORMATTER_TAB_SIZE,
						FormatterMessages.IndentationTabPage_general_group_option_tab_size);
		tabSize.addModifyListener(e -> {
			int index = tabPolicy.getSelectionIndex();
			if (index >= 0) {
				final boolean tabMode = CodeFormatterConstants.TAB
						.equals(tabPolicyItems[index]);
				if (tabMode) {
					indentSize.setText(tabSize.getText());
				}
			}
		});
	}

}