/*
* Copyright 2000-2016 JetBrains s.r.o.
*
* 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.
*/
package com.intellij.util;
import com.intellij.util.containers.JBTreeTraverser;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.awt.*;
import java.util.Arrays;
import java.util.EventListener;
import static com.intellij.util.ui.UIUtil.uiTraverser;
/**
* Pushes events down the UI components hierarchy.
*
* @author gregsh
*/
public class ComponentTreeEventDispatcher<T extends EventListener> {
private final Class<T> myListenerClass;
private final T myMulticaster;
public static <T extends EventListener> ComponentTreeEventDispatcher<T> create(@NotNull Class<T> listenerClass) {
return create(null, listenerClass);
}
public static <T extends EventListener> ComponentTreeEventDispatcher<T> create(@Nullable Component root, @NotNull Class<T> listenerClass) {
return new ComponentTreeEventDispatcher<T>(root, listenerClass);
}
private ComponentTreeEventDispatcher(@Nullable final Component root, @NotNull Class<T> listenerClass) {
myListenerClass = listenerClass;
myMulticaster = EventDispatcher.createMulticaster(listenerClass, () -> {
JBTreeTraverser<Component> traverser = uiTraverser(root);
if (root == null) traverser = traverser.withRoots(Arrays.asList(Window.getWindows()));
return traverser.postOrderDfsTraversal().filter(myListenerClass);
});
}
@NotNull
public T getMulticaster() {
return myMulticaster;
}
}