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/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.internal.editors.quickdiff;
import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.action.Action;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.IPostSelectionProvider;
import org.eclipse.jface.viewers.ISelectionChangedListener;
import org.eclipse.jface.viewers.ISelectionProvider;
import org.eclipse.jface.viewers.SelectionChangedEvent;
import org.eclipse.ui.texteditor.ITextEditor;
import org.eclipse.ui.texteditor.IUpdate;
/**
* Combines a list of actions, taking the personality of the first that is
* enabled.
*
* @since 3.1
*/
public final class CompositeRevertAction extends Action implements IUpdate, ISelectionChangedListener {
/**
* The actions.
*/
private final IAction[] fActions;
/**
* Creates an action combining the two given actions.
*
* @param editor the editor
* @param actions the list of actions
*/
public CompositeRevertAction(ITextEditor editor, IAction[] actions) {
fActions= new IAction[actions.length];
for (IAction action : actions) {
Assert.isNotNull(action);
}
System.arraycopy(actions, 0, fActions, 0, actions.length);
ISelectionProvider selectionProvider= editor.getSelectionProvider();
if (selectionProvider instanceof IPostSelectionProvider)
((IPostSelectionProvider)selectionProvider).addPostSelectionChangedListener(this);
update();
}
@Override
public void update() {
for (IAction fAction : fActions) {
if (fAction instanceof IUpdate) {
((IUpdate) fAction).update();
}
}
IAction action= getEnabledAction();
setEnabled(getEnabledAction() != null);
if (action == null)
return;
setText(action.getText());
setToolTipText(action.getToolTipText());
}
@Override
public void selectionChanged(SelectionChangedEvent event) {
update();
}
@Override
public void run() {
IAction action= getEnabledAction();
if (action != null)
action.run();
}
/**
* Returns the first enabled action, or <code>null</code> if none is
* enabled.
*
* @return the first enabled action, or <code>null</code> if none is
* enabled
*/
private IAction getEnabledAction() {
for (IAction fAction : fActions) {
if (fAction.isEnabled()) {
return fAction;
}
}
return null;
}
}
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