// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// ${file_name}

// 

//

package com.symbian.smt.gui.smtwidgets;

import org.eclipse.jface.dialogs.MessageDialog;

import org.eclipse.swt.SWT;

import org.eclipse.swt.events.KeyEvent;

import org.eclipse.swt.events.KeyListener;

import org.eclipse.swt.events.SelectionAdapter;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.layout.FillLayout;

import org.eclipse.swt.layout.GridData;

import org.eclipse.swt.layout.GridLayout;

import org.eclipse.swt.layout.RowData;

import org.eclipse.swt.layout.RowLayout;

import org.eclipse.swt.widgets.Button;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Label;

import org.eclipse.swt.widgets.List;

import org.eclipse.swt.widgets.Text;

public class FilterWidget extends Composite {

	private Text text = null;

	private List list;

	private Button modifyButton;

	/**

	 * Creates a FilterWidget composite object

	 * 

	 * @return void

	 */

	public FilterWidget(final Composite parent, int style) {

		super(parent, style);

		this.setLayout(new FillLayout());

		final Composite gridLayoutComposite = new Composite(this, SWT.NONE);

		final GridLayout gridLayout = new GridLayout();

		gridLayout.numColumns = 2;

		gridLayoutComposite.setLayout(gridLayout);

		list = new List(gridLayoutComposite, SWT.BORDER);

		final GridData gd_list = new GridData(SWT.FILL, SWT.FILL, true, true,

				2, 1);

		gd_list.widthHint = 439;

		list.setLayoutData(gd_list);

		list.addSelectionListener(new SelectionAdapter() {

			public void widgetSelected(final SelectionEvent e) {

				int index = list.getSelectionIndex();

				if (index != -1) {

					String filterSelected = list.getItem(index);

					text.setText(filterSelected);

					text.setFocus();

					modifyButton.setEnabled(true);

				}

			}

		});

		final Label filterLabel = new Label(gridLayoutComposite, SWT.NONE);

		filterLabel.setText("Filter");

		text = new Text(gridLayoutComposite, SWT.BORDER);

		text.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));

		text.setFocus();

		text.addKeyListener(new KeyListener() {

			public void keyPressed(KeyEvent e) {

			}

			public void keyReleased(KeyEvent e) {

				if (text.getText().length() == 0) {

					modifyButton.setEnabled(false);

				}

			}

		});

		final Composite buttonsComposite = new Composite(gridLayoutComposite,

				SWT.NONE);

		final RowLayout rowLayout = new RowLayout();

		rowLayout.spacing = 30;

		rowLayout.justify = true;

		buttonsComposite.setLayout(rowLayout);

		final GridData gd_buttonsComposite = new GridData(SWT.CENTER, SWT.FILL,

				true, false, 2, 1);

		buttonsComposite.setLayoutData(gd_buttonsComposite);

		final Button addFilterButton = new Button(buttonsComposite, SWT.NONE);

		final RowData rd_addFilterButton = new RowData();

		rd_addFilterButton.width = 75;

		addFilterButton.setLayoutData(rd_addFilterButton);

		addFilterButton.setText("Add");

		addFilterButton.addSelectionListener(new SelectionAdapter() {

			public void widgetSelected(final SelectionEvent e) {

				// Adds the text entered in the filter text to the list of

				// filter items

				String filter = text.getText().trim();

				if (filter.length() > 0) {

					// Check that text has been entered and that it does not

					// already exist in the table

					Boolean doesExistInList = false;

					for (String s : list.getItems()) {

						if (s.equals(filter)) {

							doesExistInList = true;

						}

					}

					if (!doesExistInList) {

						// If it doesn't exist in the table then add it and

						// clear the text box

						list.add(filter);

						text.setText("");

						modifyButton.setEnabled(false);

					} else {

						MessageDialog

								.openError(

										parent.getShell(),

										"Error",

										filter

												+ " already exists in the list of filters.");

					}

				}

				text.setFocus();

			}

		});

		final Button removeFilterButton = new Button(buttonsComposite, SWT.NONE);

		final RowData rd_removeFilterButton = new RowData();

		rd_removeFilterButton.width = 75;

		removeFilterButton.setLayoutData(rd_removeFilterButton);

		removeFilterButton.setText("Remove");

		removeFilterButton.addSelectionListener(new SelectionAdapter() {

			public void widgetSelected(SelectionEvent e) {

				int listIndex = list.getSelectionIndex();

				if (listIndex != -1) {

					// If an item has been selected in the table then remove it

					list.remove(listIndex);

					text.setText("");

					modifyButton.setEnabled(false);

				} else {

					MessageDialog.openInformation(parent.getShell(), "Info",

							"You need to select an item to remove.");

				}

				text.setFocus();

			}

		});

		modifyButton = new Button(buttonsComposite, SWT.NONE);

		final RowData rd_modifyButton = new RowData();

		rd_modifyButton.width = 75;

		modifyButton.setLayoutData(rd_modifyButton);

		modifyButton.setText("Modify");

		modifyButton.setEnabled(false);

		modifyButton.addSelectionListener(new SelectionAdapter() {

			public void widgetSelected(final SelectionEvent e) {

				// Modifies a table entry in place

				int index = list.getSelectionIndex();

				String filter = text.getText().trim();

				if (filter.length() > 0) {

					// Check filter text has been entered

					Boolean doesExistInList = false;

					for (String s : list.getItems()) {

						// Check that the entry doesn't already exist in the

						// table

						if (s.equals(filter)) {

							doesExistInList = true;

						}

					}

					if (!doesExistInList) {

						// If it doesn't already exist in the table then add it

						list.remove(index);

						list.add(filter, index);

						text.setText("");

						modifyButton.setEnabled(false);

					}

				}

				text.setFocus();

			}

		});

	}

	/**

	 * Returns the filter items

	 * 

	 * @return String[]

	 */

	public String[] getFilterItems() {

		return list.getItems();

	}

	/**

	 * Sets the filter items

	 * 

	 * @param filterItems

	 *            A list containing filters.

	 * @return void

	 */

	public void setFilterItems(String[] filterItems) {

		if (filterItems != null)

			list.setItems(filterItems);

	}

}