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/* ExpressionListComponent.java
* =========================================================================
* This file is part of the GrInvIn project - http://www.grinvin.org
*
* Copyright (C) 2005-2008 Universiteit Gent
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program 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
* General Public License for more details.
*
* A copy of the GNU General Public License can be found in the file
* LICENSE.txt provided with the source distribution of this program (see
* the META-INF directory in the source jar). This license can also be
* found on the GNU website at http://www.gnu.org/licenses/gpl.html.
*
* If you did not receive a copy of the GNU General Public License along
* with this program, contact the lead developer, or write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
package org.grinvin.gui.components;
import java.awt.Component;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JList;
import javax.swing.KeyStroke;
import javax.swing.ListCellRenderer;
import javax.swing.ListSelectionModel;
import org.grinvin.expr.Expression;
import org.grinvin.expr.ExpressionToString;
import org.grinvin.list.ExpressionListModel;
/**
* List of expressions.
*/
public class ExpressionListComponent extends JList {
//
private final ExpressionListModel model;
// shared renderer instance
private static final ListCellRenderer RENDERER = new Renderer ();
// TODO: probably needs a special 'ExpressionListElement' which
// wraps expressions and their string/formula representations
public ExpressionListComponent(ExpressionListModel model) {
super(model);
this.model = model;
setCellRenderer(RENDERER);
// keyboard interaction
// TODO: factor out common code with other lists
getInputMap(WHEN_FOCUSED).put(KeyStroke.getKeyStroke("DELETE"), "deleteSelectedElements");
getActionMap().put("deleteSelectedElements", new AbstractAction() {
public void actionPerformed(ActionEvent ev) {
deleteSelectedElements();
}
});
}
/**
* Delete currently selected elements.
*/
public void deleteSelectedElements() {
//TODO: code copied almost verbatim from WorksheetListComponent (except last line)
// iterate over selected indices
ListSelectionModel selectionModel = getSelectionModel();
int iMin = selectionModel.getMinSelectionIndex();
int iMax = selectionModel.getMaxSelectionIndex();
if (iMin < 0 || iMax < iMin)
return ; // no selection
// remove all indicate elements
for (int i = iMax; i >= iMin; i--)
if (selectionModel.isSelectedIndex(i))
model.remove(i);
}
private static class Renderer extends DefaultListCellRenderer {
// converts expressions to strings
private final ExpressionToString expressionToString;
Renderer() {
this.expressionToString = new ExpressionToString();
}
public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
((Expression)value).accept(expressionToString);
setText(expressionToString.getString());
return this;
}
}
}
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