/*
* Copyright 2010 The Rabbit Eclipse Plug-in Project
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package rabbit.ui.internal.viewers;
import static com.google.common.base.Preconditions.checkNotNull;
import org.eclipse.jface.viewers.CellLabelProvider;
import org.eclipse.jface.viewers.IColorProvider;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.jface.viewers.ViewerCell;
import javax.annotation.Nullable;
/**
* A {@link CellLabelProvider} that treats the value of a {@link TreePath} as an
* integer, then simple converts the integer to string and use that as the label
* of the cell representing the path. The value of the path is supplied by a
* {@link IValueProvider}, if {@link IValueProvider#shouldPaint(Object)} returns
* <code>false</code> on a object in a cell, then the text of the cell
* representing the path will be blank.
*/
public final class TreePathIntLabelProvider extends CellLabelProvider {
private final IValueProvider valueProvider;
private final IColorProvider colorProvider;
/**
* @param valueProvider the value provider to provide value for the tree
* paths.
*/
public TreePathIntLabelProvider(IValueProvider valueProvider) {
this(valueProvider, null);
}
/**
* @param valueProvider The value provider to provide value for the tree
* paths.
* @param colorProvider the optional color provider for coloring the cells.
*/
public TreePathIntLabelProvider(IValueProvider valueProvider,
@Nullable IColorProvider colorProvider) {
this.valueProvider = checkNotNull(valueProvider, "valueProvider");
this.colorProvider = colorProvider;
}
/**
* @return the value provider that provides the tree path values.
*/
public IValueProvider getValueProvider() {
return valueProvider;
}
@Override
public void update(ViewerCell cell) {
TreePath path = cell.getViewerRow().getTreePath();
String text = null;
if (getValueProvider().shouldPaint(cell.getElement())) {
text = String.valueOf(getValueProvider().getValue(path));
}
cell.setText(text);
if (colorProvider != null) {
cell.setBackground(colorProvider.getBackground(cell.getElement()));
cell.setForeground(colorProvider.getForeground(cell.getElement()));
}
}
}