/*
* Copyright (c) 2006 Matthew Hall and others.
* 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:
* Matthew Hall - initial API and implementation
*/
package org.eclipse.nebula.paperclips.core.grid;
import org.eclipse.swt.graphics.RGB;
/**
* Default implementation of the CellBackgroundProvider interface.
*
* @author Matthew Hall
*/
public class DefaultCellBackgroundProvider implements CellBackgroundProvider {
private final CellBackgroundProvider chain;
private RGB background;
/**
* Constructs a DefaultGridBackgroundProvider with a null background.
*/
public DefaultCellBackgroundProvider() {
this.chain = null;
this.background = null;
}
/**
* Constructs a DefaultGridBackgroundProvider which chains to the argument
* if this instance has a null background color. (DefaultGridLook uses this
* constructor to cause header and footer background colors to default to
* the body background color.)
*
* @param chain
* the provider to chain a getCellBackground(...) call to if this
* instance would return null. Ignored if null.
*/
public DefaultCellBackgroundProvider(CellBackgroundProvider chain) {
this.chain = chain;
this.background = null;
}
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result
+ ((background == null) ? 0 : background.hashCode());
result = prime * result + ((chain == null) ? 0 : chain.hashCode());
return result;
}
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
DefaultCellBackgroundProvider other = (DefaultCellBackgroundProvider) obj;
if (background == null) {
if (other.background != null)
return false;
} else if (!background.equals(other.background))
return false;
if (chain == null) {
if (other.chain != null)
return false;
} else if (!chain.equals(other.chain))
return false;
return true;
}
/**
* Returns the value in the background property. If the background property
* is null, the chained provider will be consulted to obtain a background
* color.
*/
public RGB getCellBackground(int row, int column, int colspan) {
RGB result = getBackground();
if (result == null && chain != null)
result = chain.getCellBackground(row, column, colspan);
return result;
}
/**
* Returns the background color.
*
* @return the background color.
*/
public RGB getBackground() {
return background;
}
/**
* Sets the background color to the argument.
*
* @param background
* the new background color.
*/
public void setBackground(RGB background) {
this.background = background;
}
}