org.eclipse.jdt.ui/ui refactoring/org/eclipse/jdt/internal/ui/refactoring/InputPageUtil.java

/*******************************************************************************
 * Copyright (c) 2000, 2012 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.jdt.internal.ui.refactoring;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Group;

import org.eclipse.jface.layout.PixelConverter;
import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.resource.JFaceResources;

import org.eclipse.jface.text.Document;

import org.eclipse.jdt.core.dom.Modifier;

import org.eclipse.jdt.ui.PreferenceConstants;
import org.eclipse.jdt.ui.text.JavaSourceViewerConfiguration;

import org.eclipse.jdt.internal.ui.JavaPlugin;
import org.eclipse.jdt.internal.ui.javaeditor.JavaSourceViewer;

public final class InputPageUtil {
	private InputPageUtil() {
		// static helper class
	}

	public static Composite createVisibilityControl(Composite parent, final IVisibilityChangeListener visibilityChangeListener, int[] availableVisibilities, int correctVisibility) {
		List<Integer> allowedVisibilities= convertToIntegerList(availableVisibilities);
		if (allowedVisibilities.size() == 1)
			return null;

		Group group= new Group(parent, SWT.NONE);
		group.setText(RefactoringMessages.VisibilityControlUtil_Access_modifier);
		GridData gd= new GridData(GridData.FILL_HORIZONTAL);
		group.setLayoutData(gd);
		GridLayout layout= new GridLayout();
		layout.makeColumnsEqualWidth= true;
		layout.numColumns= 4;
		group.setLayout(layout);

		String[] labels= new String[] {
			"&public", //$NON-NLS-1$
			"pro&tected", //$NON-NLS-1$
			RefactoringMessages.VisibilityControlUtil_defa_ult_4,
			"pri&vate" //$NON-NLS-1$
		};
		Integer[] data= new Integer[] {
					Modifier.PUBLIC,
					Modifier.PROTECTED,
					Modifier.NONE,
					Modifier.PRIVATE};
		Integer initialVisibility= correctVisibility;
		for (int i= 0; i < labels.length; i++) {
			Button radio= new Button(group, SWT.RADIO);
			Integer visibilityCode= data[i];
			radio.setText(labels[i]);
			radio.setData(visibilityCode);
			radio.setSelection(visibilityCode.equals(initialVisibility));
			radio.setEnabled(allowedVisibilities.contains(visibilityCode));
			radio.addSelectionListener(new SelectionAdapter() {
				@Override
				public void widgetSelected(SelectionEvent event) {
					visibilityChangeListener.visibilityChanged(((Integer)event.widget.getData()));
				}
			});
		}
		group.setLayoutData((new GridData(GridData.FILL_HORIZONTAL)));
		return group;
	}

	private static List<Integer> convertToIntegerList(int[] array) {
		List<Integer> result= new ArrayList<>(array.length);
		for (int element : array) {
			result.add(element);
		}
		return result;
	}

	/**
	 * Creates a signature preview viewer in a parent composite with a 1-column GridLayout.
	 *
	 * @param parent the parent
	 * @return the preview viewer
	 * @since 3.9
	 */
	public static JavaSourceViewer createSignaturePreview(Composite parent) {
		IPreferenceStore store= JavaPlugin.getDefault().getCombinedPreferenceStore();
		JavaSourceViewer signaturePreview= new JavaSourceViewer(parent, null, null, false, SWT.READ_ONLY | SWT.V_SCROLL | SWT.WRAP, store);
		signaturePreview.configure(new JavaSourceViewerConfiguration(JavaPlugin.getDefault().getJavaTextTools().getColorManager(), store, null, null));
		StyledText textWidget= signaturePreview.getTextWidget();
		textWidget.setFont(JFaceResources.getFont(PreferenceConstants.EDITOR_TEXT_FONT));
		textWidget.setAlwaysShowScrollBars(false);
		signaturePreview.adaptBackgroundColor(parent);
		signaturePreview.setDocument(new Document());
		signaturePreview.setEditable(false);

		GridData gdata= new GridData(GridData.FILL_BOTH);
		gdata.widthHint= new PixelConverter(textWidget).convertWidthInCharsToPixels(50);
		gdata.heightHint= textWidget.getLineHeight() * 2;
		textWidget.setLayoutData(gdata);

		return signaturePreview;
	}
}