/*
* Created on Mar 30, 2008
*
* 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.
*
* Copyright @2008-2013 the original author or authors.
*/
package org.fest.swing.core;
import static org.fest.swing.edt.GuiActionRunner.execute;
import static org.fest.util.Lists.newArrayList;
import static org.fest.util.Preconditions.checkNotNull;
import java.awt.Component;
import java.util.List;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.fest.swing.annotation.RunsInCurrentThread;
import org.fest.swing.annotation.RunsInEDT;
import org.fest.swing.edt.GuiQuery;
import org.fest.util.VisibleForTesting;
/**
* Finds the AWT or Swing {@code Component} owning the input focus.
*
* @author Yvonne Wang
* @author Alex Ruiz
*/
public final class FocusOwnerFinder {
private static final List<FocusOwnerFinderStrategy> STRATEGIES = newArrayList();
static {
initializeStrategies();
}
@VisibleForTesting
static void initializeStrategies() {
replaceStrategiesWith(new ReflectionBasedFocusOwnerFinder(), new HierarchyBasedFocusOwnerFinder());
}
@VisibleForTesting
static void replaceStrategiesWith(@Nonnull FocusOwnerFinderStrategy... strategies) {
STRATEGIES.clear();
STRATEGIES.addAll(newArrayList(strategies));
}
@VisibleForTesting
static @Nonnull List<FocusOwnerFinderStrategy> strategies() {
return newArrayList(STRATEGIES);
}
/**
* @return the focus owner. This method is executed in the event dispatch thread (EDT.)
*/
@RunsInEDT
public static @Nullable Component inEdtFocusOwner() {
return execute(new GuiQuery<Component>() {
@Override
protected @Nullable Component executeInEDT() {
return focusOwner();
}
});
}
/**
* <p>
* Returns the focus owner.
* </p>
*
* <p>
* <b>Note:</b> This method is accessed in the current executing thread. Such thread may or may not be the event
* dispatch thread (EDT.) Client code must call this method from the EDT.
* </p>
*
* @return the focus owner.
*/
@RunsInCurrentThread
public static @Nullable Component focusOwner() {
for (FocusOwnerFinderStrategy strategy : STRATEGIES) {
Component focusOwner = focusOwnerFrom(checkNotNull(strategy));
if (focusOwner != null) {
return focusOwner;
}
}
return null;
}
private static @Nullable Component focusOwnerFrom(@Nonnull FocusOwnerFinderStrategy strategy) {
try {
return strategy.focusOwner();
} catch (Exception e) {
return null;
}
}
private FocusOwnerFinder() {}
}