/*******************************************************************************
 * Copyright (c) 2005 - 2015 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
 *     Lars Vogel <Lars.Vogel@gmail.com> - Bug 414565
 *     Robert Roth <robert.roth.off@gmail.com> - Bug 417685
 *******************************************************************************/
package org.eclipse.jface.snippets.viewers;

import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ColumnPixelData;
import org.eclipse.jface.viewers.OwnerDrawLabelProvider;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.jface.viewers.TableLayout;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TableColumn;

public class Snippet006TableMultiLineCells {


	static class LineEntry {

		String line;

		int columnWidth;

		/**
		 * Create a new instance of the receiver with name text constrained to a
		 * column of width.
		 */

		LineEntry(String text, int width) {
			line = text;
			columnWidth = width;
		}

		public int getHeight(Event event) {
			event.gc.setLineWidth(columnWidth);
			return event.gc.textExtent(line).y;
		}

		public int getWidth(Event event) {
			return columnWidth;
		}

		protected Font getFont() {
			return JFaceResources.getFont(JFaceResources.HEADER_FONT);
		}

		public void draw(Event event) {
			event.gc.drawText(line, event.x, event.y);

		}
	}

	private TableViewer viewer;

	private final LineEntry[] entries;

	public Snippet006TableMultiLineCells() {
		String[] lines = new String[] {
				"This day is called the feast of Crispian:",
				"He that outlives this day, \n and comes safe home,",
				"Will stand a tip-toe when the day is named,",
				"And rouse him at the name of Crispian.",
				"He that shall live this day,\n and see old age,",
				"Will yearly on the vigil feast his neighbours,",
				"And say 'To-morrow is Saint Crispian:'",
				"Then will he strip his sleeve and show his scars.",
				"And say 'These wounds I had on Crispin's day.'",
				"Old men forget:\n yet all shall be forgot,",
				"But he'll remember with advantages",
				"What feats he did that day:\n then shall our names.",
				"Familiar in his mouth as household words",
				"Harry the king, Bedford and Exeter,",
				"Warwick and Talbot,\n Salisbury and Gloucester,",
				"Be in their flowing cups freshly remember'd.",
				"This story shall the good man teach his son;",
				"And Crispin Crispian shall ne'er go by,",
				"From this day to the ending of the world,",
				"But we in it shall be remember'd;",
				"We few,\n we happy few,\n we band of brothers;",
				"For he to-day that sheds his blood with me",
				"Shall be my brother;\n be he ne'er so vile,",
				"This day shall gentle his condition:",
				"And gentlemen in England now a-bed",
				"Shall think themselves accursed they were not here,",
				"And hold their manhoods cheap whiles any speaks",
				"That fought with us upon Saint Crispin's day." };

		entries = new LineEntry[lines.length];
		for (int i = 0; i < lines.length; i++) {
			entries[i] = new LineEntry(lines[i], 35);
		}
	}

	public void createPartControl(Composite parent) {
		viewer = new TableViewer(parent, SWT.FULL_SELECTION);

		viewer.setContentProvider(ArrayContentProvider.getInstance());
		createColumns();

		viewer.setLabelProvider(new OwnerDrawLabelProvider() {

			@Override
			protected void measure(Event event, Object element) {
				event.width = viewer.getTable().getColumn(event.index).getWidth();
				if (event.width == 0)
					return;
				LineEntry line = (LineEntry) element;
				Point size = event.gc.textExtent(line.line);
				int lines = size.x / event.width + 1;
				event.height = size.y * lines;

			}

			@Override
			protected void paint(Event event, Object element) {

				LineEntry entry = (LineEntry) element;
				event.gc.drawText(entry.line, event.x, event.y, true);
			}
		});
		viewer.setInput(entries);

		GridData data = new GridData(GridData.GRAB_HORIZONTAL
				| GridData.GRAB_VERTICAL | GridData.FILL_BOTH);

		viewer.getControl().setLayoutData(data);

		viewer.setSelection(new StructuredSelection(entries[1]));
	}

	/**
	 * Create the columns to be used in the tree.
	 */
	private void createColumns() {
		TableLayout layout = new TableLayout();
		viewer.getTable().setLayout(layout);
		viewer.getTable().setHeaderVisible(true);
		viewer.getTable().setLinesVisible(true);

		TableColumn tc = new TableColumn(viewer.getTable(), SWT.NONE, 0);
		layout.addColumnData(new ColumnPixelData(350));
		tc.setText("Lines");

	}

	public static void main(String[] args) {

		Display display = new Display();
		Shell shell = new Shell(display, SWT.CLOSE);
		shell.setSize(400, 400);
		shell.setLayout(new GridLayout());

		Snippet006TableMultiLineCells example = new Snippet006TableMultiLineCells();
		example.createPartControl(shell);

		shell.open();

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


}