tests/org.eclipse.swt.tests.gtk/ManualTests/org/eclipse/swt/tests/gtk/snippets/Bug166720_TableEditorFlicker.java

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 * Copyright (c) 2018 Red Hat and others. All rights reserved.
 * The contents of this file are made available under the terms
 * of the GNU Lesser General Public License (LGPL) Version 2.1 that
 * accompanies this distribution (lgpl-v21.txt).  The LGPL is also
 * available at http://www.gnu.org/licenses/lgpl.html.  If the version
 * of the LGPL at http://www.gnu.org is different to the version of
 * the LGPL accompanying this distribution and there is any conflict
 * between the two license versions, the terms of the LGPL accompanying
 * this distribution shall govern.
 *
 * Contributors:
 *     Red Hat - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.tests.gtk.snippets;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.TableEditor;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;
import org.eclipse.swt.widgets.Text;

/*
 * Title: Bug 166720 - [TableEditor] flickers quite a bit when scrolling - Linux GTK
 * How to run: launch snippet and scroll TableEditor.
 * Bug description: TableEditor flickers when scrolling.
 * Expected results: TableEditor should scroll smoothly.
 * GTK Version(s): GTK2.x
 */
public class Bug166720_TableEditorFlicker {
	public static void main(String[] args) {
		Display display = new Display ();
		Shell shell = new Shell (display);
		shell.setLayout (new GridLayout ());
		Table table = new Table (shell, SWT.BORDER | SWT.MULTI);
		GridData gd = new GridData(GridData.FILL_BOTH);
		gd.heightHint = 200;
		gd.widthHint = 200;
		table.setLayoutData(gd);

		TableColumn column = new TableColumn(table, SWT.NONE);
		column.setWidth (100);
		for (int i=0; i<100; i++) {
			new TableItem (table, SWT.NONE);
		}
		TableItem [] items = table.getItems ();
		for (int i=0; i<items.length; i++) {
			TableEditor editor = new TableEditor (table);
			editor = new TableEditor (table);
			Text text = new Text (table, SWT.NONE);
			text.setText("Text" + i);
			editor.grabHorizontal = true;
			editor.setEditor(text, items[i], 0);
			editor = new TableEditor (table);
		}
		shell.pack ();
		shell.open ();
		while (!shell.isDisposed ()) {
			if (!display.readAndDispatch ()) display.sleep ();
		}
		display.dispose ();
	}
}