package table.test;

import org.eclipse.jface.viewers.ILazyContentProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.ViewPart;

public class View extends ViewPart {
	public static final String ID = "table.test.view";

	private static final int NUM_COLUMNS = 10;
	private static final int NUM_ELEMS = 1000 * 1000;

	private TableViewer viewer;

	class ViewLazyContentProvider implements ILazyContentProvider {
		private final TableViewer viewer;

		ViewLazyContentProvider(final TableViewer viewer) {
			this.viewer = viewer;
		}

		@Override
		public void updateElement(final int index) {
			viewer.replace(index, index);
		}

		@Override
		public void dispose() {
		}

		@Override
		public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
		}
	}

	class ViewLabelProvider extends LabelProvider implements
			ITableLabelProvider {
		public String getColumnText(Object obj, int index) {
			final int rowNum = (Integer) obj;
			final int colNum = index;
			return "(" + rowNum + ", " + colNum + ")";
		}

		public Image getColumnImage(Object obj, int index) {
			return getImage(obj);
		}

		public Image getImage(Object obj) {
			return PlatformUI.getWorkbench().getSharedImages().getImage(
					ISharedImages.IMG_OBJ_ELEMENT);
		}
	}

	/**
	 * This is a callback that will allow us to create the viewer and initialize
	 * it.
	 */
	public void createPartControl(Composite parent) {
		viewer = new TableViewer(parent, SWT.MULTI | SWT.H_SCROLL
				| SWT.V_SCROLL | SWT.VIRTUAL);
		viewer.setContentProvider(new ViewLazyContentProvider(viewer));
		viewer.setLabelProvider(new ViewLabelProvider());

		for (int i = 0; i < NUM_COLUMNS; i++) {
			final TableColumn col = new TableColumn(viewer.getTable(),
					SWT.NONE);
			col.setWidth(120);
			col.setText("Column " + i);
		}

		viewer.setInput(getViewSite());
		viewer.setItemCount(NUM_ELEMS);

		viewer.getTable().setHeaderVisible(true);
	}

	/**
	 * Passing the focus request to the viewer's control.
	 */
	public void setFocus() {
		viewer.getControl().setFocus();
	}
}