com.jgoodies.forms.internal.FocusTraversalUtilsAccessor Maven / Gradle / Ivy
/*
* 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;
}
}