/*

 * Copyright (C) 2010, 2011 Openismus GmbH

 *

 * This file is part of GWT-Glom.

 *

 * GWT-Glom is free software: you can redistribute it and/or modify it

 * under the terms of the GNU Lesser General Public License as published by the

 * Free Software Foundation, either version 3 of the License, or (at your

 * option) any later version.

 *

 * GWT-Glom is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License

 * for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with GWT-Glom.  If not, see <http://www.gnu.org/licenses/>.

 */

package org.glom.web.client.ui;

import org.glom.web.client.place.DetailsPlace;

import org.glom.web.client.ui.cell.NavigationButtonCell;

import org.glom.web.client.ui.list.ListViewTable;

import org.glom.web.shared.TypedDataItem;

import org.glom.web.shared.layout.LayoutGroup;

import com.google.gwt.cell.client.ValueUpdater;

import com.google.gwt.dom.client.Element;

import com.google.gwt.dom.client.NativeEvent;

import com.google.gwt.user.client.ui.Composite;

import com.google.gwt.user.client.ui.FlowPanel;

public class ListViewImpl extends Composite implements ListView {

	/*

	 * Cell renderer for Details open buttons.

	 */

	private class ListViewNavigationButtonCell extends NavigationButtonCell {

		private final String documentID;

		private final String tableName;

		public ListViewNavigationButtonCell(final String documentID, final String tableName) {

			this.documentID = documentID;

			this.tableName = tableName;

		}

		/*

		 * (non-Javadoc)

		 * 

		 * @see com.google.gwt.cell.client.ButtonCell#onEnterKeyDown(com.google.gwt.cell.client.Cell.Context,

		 * com.google.gwt.dom.client.Element, java.lang.String, com.google.gwt.dom.client.NativeEvent,

		 * com.google.gwt.cell.client.ValueUpdater)

		 */

		@Override

		protected void onEnterKeyDown(final Context context, final Element parent, final String value,

				final NativeEvent event, final ValueUpdater<String> valueUpdater) {

			presenter.goTo(new DetailsPlace(documentID, tableName, (TypedDataItem) context.getKey()));

		}

	}

	final private FlowPanel mainPanel = new FlowPanel();

	private Presenter presenter;

	public ListViewImpl() {

		initWidget(mainPanel);

	}

	@Override

	public void setPresenter(final Presenter presenter) {

		this.presenter = presenter;

	}

	@Override

	public void setCellTable(final String documentID, final LayoutGroup layoutGroup,

			final String quickFind) {

		// This is not really in the MVP style because we're creating a new ListTable (really just a configured

		// CellTable) for every document and table name change. The issue with creating a re-usable CellTable with

		// methods like setColumnTitles() and setNumRows() is that the column objects (new Column<DataItem[],

		// DataItem>(new GlomTextCell())) aren't destroyed when the column is removed from the CellTable and

		// IndexOutOfBounds exceptions are encountered with invalid array indexes trying access the data in this line:

		// return object[j]. There's probably a workaround that could be done to fix this but I'm leaving it until

		// there's a reason to fix it (performance, ease of testing, alternate implementation or otherwise).

		// Note: This comment refers to code that is now in the ListTable class.

		mainPanel.clear();

		final ListViewTable listViewTable = new ListViewTable(documentID, layoutGroup,

				new ListViewNavigationButtonCell(documentID, layoutGroup.getTableName()), quickFind);

		if (layoutGroup.getExpectedResultSize() <= listViewTable.getMinNumVisibleRows()) {

			// Set the table row count to the minimum row count if the data row count is less than or equal to

			// the minimum row count. This ensures that data with fewer rows than the minimum will not create

			// indexes in the underlying CellTable that will override the rendering of the empty rows.

			listViewTable.setRowCount(listViewTable.getMinNumVisibleRows());

		} else {

			// Set the table row count to the data row count if it's larger than the minimum number of rows

			// visible.

			listViewTable.setRowCount(layoutGroup.getExpectedResultSize());

		}

		mainPanel.add(listViewTable);

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see org.glom.web.client.ui.ListView#clear()

	 */

	@Override

	public void clear() {

		mainPanel.clear();

	}

}