/*
* Created on May 31, 2009
*
* 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 @2009-2013 the original author or authors.
*/
package org.fest.swing.core;
import java.awt.Component;
import java.awt.Container;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import org.fest.swing.annotation.RunsInCurrentThread;
/**
* Finds the focus owner using the roots of a {@code Component} hierarchy.
*
* @author Alex Ruiz
*/
class HierarchyBasedFocusOwnerFinder implements FocusOwnerFinderStrategy {
private final ContainerFocusOwnerFinder delegate;
private final HierarchyRootsSource rootsSource;
HierarchyBasedFocusOwnerFinder() {
this(new ContainerFocusOwnerFinder(), new HierarchyRootsSource());
}
HierarchyBasedFocusOwnerFinder(@Nonnull ContainerFocusOwnerFinder newDelegate,
@Nonnull HierarchyRootsSource newRootsSource) {
delegate = newDelegate;
rootsSource = newRootsSource;
}
@Override
@RunsInCurrentThread
public @Nullable Component focusOwner() {
for (Container c : rootsSource.existingHierarchyRoots()) {
Component focus = delegate.focusOwnerOf(c);
if (focus != null) {
return focus;
}
}
return null;
}
}