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/*******************************************************************************
* Copyright (c) 2004, 2007 Boeing.
* 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:
* Boeing - initial API and implementation
*******************************************************************************/
package org.eclipse.osee.framework.ui.swt;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CCombo;
import org.eclipse.swt.custom.TableEditor;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableItem;
/**
* Edits column data in a table by using a combo control. The options in the combo box are enumeration constants that
* this is parameterized with.
*
* @author Ken J. Aguilar
*/
public abstract class EnumeratedCellEditor<T extends Enum<T>> extends CustomTableCellEditor<T> {
private final TableEditor editor;
private final Table table;
private final int columnIndex;
private final int comboStyle;
private final String toolTip;
private final Class<T> clazz;
private final String[] comboItems;
private boolean enabled;
private final Color color;
private final class EditCellListener implements Listener {
@Override
public void handleEvent(Event event) {
final Point pt = new Point(event.x, event.y);
int index = table.getTopIndex();
while (index < table.getItemCount()) {
final int rowIndex = index;
final TableItem item = table.getItem(index);
final Rectangle rect = item.getBounds(columnIndex);
if (rect.contains(pt)) {
final T oldValue = clazz.getEnumConstants()[getIndexByText(item.getText(columnIndex))];
final CCombo combo = new CCombo(table, comboStyle);
combo.setBackground(color);
combo.setItems(comboItems);
combo.setToolTipText(toolTip);
final Listener textListener = new Listener() {
@Override
public void handleEvent(final Event e) {
final T value = clazz.getEnumConstants()[combo.getSelectionIndex()];
switch (e.type) {
case SWT.FocusOut:
item.setText(columnIndex, focusLost(rowIndex, value, oldValue).toString());
combo.dispose();
break;
case SWT.Traverse:
switch (e.detail) {
case SWT.TRAVERSE_RETURN:
item.setText(columnIndex, applyValue(rowIndex, value, oldValue).toString());
// FALL THROUGH
case SWT.TRAVERSE_ESCAPE:
combo.dispose();
e.doit = false;
}
break;
case SWT.Selection:
item.setText(columnIndex, applyValue(rowIndex, value, oldValue).toString());
combo.dispose();
break;
}
}
};
combo.addListener(SWT.FocusOut, textListener);
combo.addListener(SWT.Traverse, textListener);
combo.addListener(SWT.Selection, textListener);
combo.select(oldValue.ordinal());
editor.setEditor(combo, item, columnIndex);
combo.setFocus();
return;
}
index++;
}
}
}
private final EditCellListener tblListener = new EditCellListener();
/**
* Constructs a new Combo Cell Editor
*
* @param clazz the Class of the <CODE>Enum</CODE> whose enumerations will appear as options in the cell editor's
* combo box
*/
public EnumeratedCellEditor(final Table table, final int columnIndex, final int comboStyle, final String toolTip, final Class<T> clazz) {
this.table = table;
this.columnIndex = columnIndex;
this.comboStyle = comboStyle;
this.toolTip = toolTip;
this.clazz = clazz;
this.enabled = true;
comboItems = new String[clazz.getEnumConstants().length];
for (int i = 0; i < clazz.getEnumConstants().length; i++) {
comboItems[i] = clazz.getEnumConstants()[i].toString();
}
editor = new TableEditor(table);
editor.horizontalAlignment = SWT.LEFT;
editor.grabHorizontal = true;
color = table.getDisplay().getSystemColor(SWT.COLOR_WHITE);
table.addListener(SWT.MouseDown, tblListener);
}
private int getIndexByText(final String text) {
for (int i = 0; i < comboItems.length; i++) {
if (text.equals(comboItems[i])) {
return i;
}
}
throw new IllegalArgumentException("No combo item matching text: " + text);
}
/**
* Called when the user has typed a value and then presses <I><B>Enter</B></I>.
*
* @param itemIndex the zero relative index of the {@link TableItem} of the cell to be edited
* @param value the current selection in the cell before it lost focus
* @param previousValue the value that was in the cell before the edit took place
* @return the value that will be actually written into the table's cell
*/
@Override
abstract protected T applyValue(final int itemIndex, final T value, final T previousValue);
/**
* Called when the cell editor has lost focus.
*
* @param itemIndex the row index of the TableItem's cell that has lost focus
* @param value the current value of the cell just before it lost focus
* @param previousValue the value of the cell before editing began
* @return the value that cekk will be set to when focus is lost
*/
@Override
abstract protected T focusLost(final int itemIndex, final T value, final T previousValue);
/**
* Either enables or disables this cell editor. A disabled cell editor will not edit any cells in the entire column
* that this cell editor is attached to.
*
*/
public void setEnabled(boolean enabled) {
// do nothing if already enabled/disabled
if (this.enabled == enabled) {
return;
}
if (enabled) {
table.addListener(SWT.MouseDown, tblListener);
this.enabled = true;
} else {
table.removeListener(SWT.MouseDown, tblListener);
this.enabled = false;
}
}
}
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