/*******************************************************************************
 * Copyright (c) 2006, 2015 Tom Schindl 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:
 *     Tom Schindl - initial API and implementation
 *     Jeanderson Candido <http://jeandersonbc.github.io> - Bug 414565
 *     Simon Scholz <simon.scholz@vogella.com> - Bug 448143
 *     Lars Vogel <Lars.Vogel@vogella.com> - Bug 475361
 *******************************************************************************/

package org.eclipse.jface.snippets.viewers;

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

import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.ColumnLabelProvider;
import org.eclipse.jface.viewers.ColumnViewer;
import org.eclipse.jface.viewers.ColumnViewerEditor;
import org.eclipse.jface.viewers.ColumnViewerEditorActivationStrategy;
import org.eclipse.jface.viewers.EditingSupport;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.TableViewerColumn;
import org.eclipse.jface.viewers.TableViewerEditor;
import org.eclipse.jface.viewers.TextCellEditor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TableColumn;

/**
 * Edit cell values in a table
 *
 * @author Tom Schindl &lt;tom.schindl@bestsolution.at&gt;
 */
public class Snippet025TabEditing {

	public static class MyModel {
		public int counter;

		public MyModel(int counter) {
			this.counter = counter;
		}

		@Override
		public String toString() {
			return "Item " + this.counter;
		}
	}

	public Snippet025TabEditing(Shell shell) {
		final TableViewer viewer = new TableViewer(shell, SWT.BORDER
				| SWT.FULL_SELECTION);
		viewer.setContentProvider(ArrayContentProvider.getInstance());

		createColumnFor(viewer, "Column 1", 100);
		createColumnFor(viewer, "Column 2", 200);

		TableViewerEditor.create(viewer,
				new ColumnViewerEditorActivationStrategy(viewer),
				ColumnViewerEditor.TABBING_HORIZONTAL
						| ColumnViewerEditor.TABBING_MOVE_TO_ROW_NEIGHBOR
						| ColumnViewerEditor.TABBING_VERTICAL);

		viewer.setInput(createModel());
		viewer.getTable().setLinesVisible(true);
		viewer.getTable().setHeaderVisible(true);
	}

	private void createColumnFor(TableViewer viewer, String label, int width) {
		TableColumn tc = new TableColumn(viewer.getTable(), SWT.NONE);
		tc.setWidth(width);
		tc.setText(label);

		TableViewerColumn viewerColumn = new TableViewerColumn(viewer, tc);
		viewerColumn.setLabelProvider(new ColumnLabelProvider());
		viewerColumn.setEditingSupport(new MyEditingSupport(viewer));
	}

	private List<MyModel> createModel() {
		List<MyModel> elements = new ArrayList<>();

		for (int i = 0; i < 10; i++) {
			elements.add(new MyModel(i));
		}
		return elements;
	}

	public static void main(String[] args) {
		Display display = new Display();
		Shell shell = new Shell(display);
		shell.setLayout(new FillLayout());
		new Snippet025TabEditing(shell);
		shell.open();

		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}

		display.dispose();

	}

	private class MyEditingSupport extends EditingSupport{

		public MyEditingSupport(ColumnViewer viewer) {
			super(viewer);
		}

		@Override
		protected CellEditor getCellEditor(Object element) {
			return new TextCellEditor((Composite) getViewer().getControl());
		}

		@Override
		protected boolean canEdit(Object element) {
			return ((MyModel) element).counter % 2 == 0;
		}

		@Override
		protected Object getValue(Object element) {
			return ((MyModel) element).counter + "";
		}

		@Override
		protected void setValue(Object element, Object value) {
			((MyModel) element).counter = Integer.parseInt(value.toString());
			getViewer().update(element, null);
		}

	}

}