ERDHandlerUndo.java

/*
 * DBeaver - Universal Database Manager
 * Copyright (C) 2010-2017 Serge Rider (serge@jkiss.org)
 *
 * 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 org.jkiss.dbeaver.ext.erd.action;

import org.eclipse.core.commands.AbstractHandler;
import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.swt.widgets.Control;
import org.eclipse.ui.ISources;
import org.eclipse.ui.handlers.HandlerUtil;
import org.jkiss.dbeaver.ext.erd.editor.ERDEditorAdapter;
import org.jkiss.dbeaver.ext.erd.editor.ERDEditorPart;

public class ERDHandlerUndo extends AbstractHandler {
    public ERDHandlerUndo() {

    }

    @Override
    public Object execute(ExecutionEvent event) throws ExecutionException {
        Control control = (Control) HandlerUtil.getVariable(event, ISources.ACTIVE_FOCUS_CONTROL_NAME);
        if (control != null) {
            ERDEditorPart editor = ERDEditorAdapter.getEditor(control);
            if (editor != null && editor.getCommandStack().canUndo()) {
                editor.getCommandStack().undo();
            }
        }
        return null;
    }

}