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The JGoodies Forms framework helps you lay out and implement
elegant Swing panels quickly and consistently.
It makes simple things easy and the hard stuff possible,
the good design easy and the bad difficult.
/*
* Copyright (c) 2002-2013 JGoodies Software GmbH. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* o Neither the name of JGoodies Software GmbH nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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*/
package com.jgoodies.forms.internal;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.swing.AbstractButton;
/**
* Provides access to the FocusTraversalUtils class that ships with the
* JGoodies Standard Dialog Library (JSDL).
*
* Note: This class is not part of the public Forms API.
* It's intended for implementation purposes only.
* The class's API may change at any time.
*
* @author Karsten Lentzsch
* @version $Revision: 1.1 $
*/
public final class FocusTraversalUtilsAccessor {
/**
* The name of the {@code FocusTraversalUtils} from the JSDL Common library.
* This utility can group buttons if the focus traversal policy supports
* grouping, such as the {@code JGContainerOrderFocusTraversalPolicy} and
* {@code JGLayoutFocusTraversalPolicy} from the JSDL Common.
*/
private static final String FOCUS_TRAVERSAL_UTILS_NAME =
"com.jgoodies.jsdl.common.focus.FocusTraversalUtils";
/**
* Holds the public static method
* {@code com.jgoodies.jsdl.common.focus.FocusTraversalUtils#group}.
*/
private static Method groupMethod = null;
static {
groupMethod = getGroupMethod();
}
private FocusTraversalUtilsAccessor() {
// Overrides default constructor; prevents instantiation.
}
// Implementation *********************************************************
/**
* Tries to group the given buttons using the FocusTraversalUtils class
* - if available. Does nothing, if this class is not in the class path.
*/
public static void tryToBuildAFocusGroup(AbstractButton... buttons) {
if (groupMethod == null) {
return;
}
try {
groupMethod.invoke(null, (Object) buttons);
} catch (IllegalAccessException e) {
// Do nothing
} catch (InvocationTargetException e) {
// Do nothing
}
}
// Private Helper Code ****************************************************
private static Method getGroupMethod() {
try {
Class clazz = Class.forName(FOCUS_TRAVERSAL_UTILS_NAME);
return clazz.getMethod("group", new Class[] {AbstractButton[].class});
} catch (ClassNotFoundException e) {
// Ignore
} catch (SecurityException e) {
// Ignore
} catch (NoSuchMethodException e) {
// Ignore
}
return null;
}
}