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/*******************************************************************************
 * Copyright (c) 2004, 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.tests.viewers.interactive;

import java.util.List;

import org.eclipse.jface.viewers.IContentProvider;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.part.ViewPart;

/**
 * The is a test VirtualTableView of the support for SWT.VIRTUAL in JFace.
 *
 * @since 3.1
 */
public class VirtualTableView extends ViewPart {

	TableViewer<String,Object> viewer;

	int itemCount = 10000;

	/**
	 * Create a new instance of the receiver.
	 */
	public VirtualTableView() {
		super();
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.eclipse.ui.IWorkbenchPart#createPartControl(org.eclipse.swt.widgets.Composite)
	 */
	public void createPartControl(Composite parent) {

		viewer = new TableViewer<String,Object>(parent, SWT.VIRTUAL);
		viewer.setContentProvider(getContentProvider());
		viewer.setInput(this);
		viewer.setItemCount(itemCount);

		Composite buttonComposite = new Composite(parent,SWT.NONE);
		buttonComposite.setLayout(new GridLayout());

		Button resetInput = new Button(buttonComposite,SWT.PUSH);
		resetInput.setText("Reset input");
		resetInput.addSelectionListener(new SelectionAdapter(){
			public void widgetSelected(org.eclipse.swt.events.SelectionEvent e){
				resetInput();
			}
		});

		Button delete = new Button(buttonComposite, SWT.PUSH);
		delete.setText("Delete selection");
		delete.addSelectionListener(new SelectionAdapter() {
			/*
			 * (non-Javadoc)
			 *
			 * @see org.eclipse.swt.events.SelectionListener#widgetSelected(org.eclipse.swt.events.SelectionEvent)
			 */
			public void widgetSelected(SelectionEvent e) {
				String[] ar = new String[((IStructuredSelection) viewer.getSelection()).toArray().length];
				List<String> selectionList = ((IStructuredSelection)viewer.getSelection()).toList();
				String[] selection = selectionList.toArray(ar);
				doRemove(selection, viewer.getTable().getSelectionIndices());
			}
		});

	}

	protected void doRemove(String[] selection, int[] selectionIndices) {
		viewer.remove(selection);
	}

	/**
	 * Get the content provider for the receiver.
	 *
	 * @return IContentProvider
	 */
	protected IContentProvider<Object> getContentProvider() {
		return new IStructuredContentProvider<String,Object>() {
			/*
			 * (non-Javadoc)
			 *
			 * @see org.eclipse.jface.viewers.IContentProvider#dispose()
			 */
			public void dispose() {
				// Nothing to do here.

			}

			/*
			 * (non-Javadoc)
			 *
			 * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
			 */
			public String[] getElements(Object inputElement) {
				String[] elements = new String[itemCount];
				for (int i = 0; i < itemCount; i++) {
					elements[i] = "Element " + String.valueOf(i);
				}
				return elements;
			}

			/*
			 * (non-Javadoc)
			 *
			 * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer,
			 *      java.lang.Object, java.lang.Object)
			 */
			public void inputChanged(Viewer<Object> viewer, Object oldInput,
					Object newInput) {
				// Nothing to do here.

			}
		};
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.eclipse.ui.IWorkbenchPart#setFocus()
	 */
	public void setFocus() {
		viewer.getTable().setFocus();

	}

	/**
	 * Reset the input of the view.
	 */
	protected void resetInput() {
		viewer.setInput(this);
	}

}