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/*
* Copyright 2000-2014 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.openapi.actionSystem;
import com.intellij.openapi.project.DumbAware;
import com.intellij.openapi.util.ModificationTracker;
import com.intellij.psi.util.CachedValue;
import com.intellij.psi.util.CachedValueProvider;
import com.intellij.util.CachedValueImpl;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
public abstract class ComputableActionGroup extends ActionGroup implements DumbAware {
private CachedValue<AnAction[]> myChildren;
protected ComputableActionGroup() {
}
protected ComputableActionGroup(boolean popup) {
super(null, popup);
}
@Override
public boolean hideIfNoVisibleChildren() {
return true;
}
@Override
@NotNull
public final AnAction[] getChildren(@Nullable AnActionEvent e) {
if (e == null) {
return EMPTY_ARRAY;
}
if (myChildren == null) {
myChildren = new CachedValueImpl<AnAction[]>(createChildrenProvider(e.getActionManager()));
}
return myChildren.getValue();
}
@NotNull
protected abstract CachedValueProvider<AnAction[]> createChildrenProvider(@NotNull ActionManager actionManager);
public abstract static class Simple extends ComputableActionGroup {
@NotNull
@Override
protected final CachedValueProvider<AnAction[]> createChildrenProvider(@NotNull final ActionManager actionManager) {
return new CachedValueProvider<AnAction[]>() {
@Nullable
@Override
public Result<AnAction[]> compute() {
return Result.create(computeChildren(actionManager), ModificationTracker.NEVER_CHANGED);
}
};
}
@NotNull
protected abstract AnAction[] computeChildren(@NotNull ActionManager manager);
}
}
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