com.nokia.sdt.uidesigner.ui.actions.CutActionCommandHandler.java Source code

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Here is the source code for com.nokia.sdt.uidesigner.ui.actions.CutActionCommandHandler.java

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/*
* Copyright (c) 2005 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of the License "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description: 
*
*/

package com.nokia.sdt.uidesigner.ui.actions;

import com.nokia.sdt.displaymodel.adapter.IDisplayObject;
import com.nokia.sdt.editor.IComponentEditor;
import com.nokia.sdt.editor.IDesignerEditor;
import com.nokia.sdt.uidesigner.ui.editparts.ModelObjectEditPart;
import com.nokia.sdt.uidesigner.ui.utils.Adapters;

import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.UnexecutableCommand;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.edit.ui.action.CutAction;
import org.eclipse.gef.EditPart;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;

import java.util.*;

/**
 * 
 *
 */
public class CutActionCommandHandler extends CutAction {

    private CommandHandlerHelper helper;

    /**
     * @param editor the owner of the data model
     */
    public CutActionCommandHandler(IDesignerEditor editor) {
        super(editor.getDataModel().getEditingDomain());
        helper = new CommandHandlerHelper(editor);
        helper.addSelectionChangedListener(this);
    }

    public void run() {
        helper.doExecute(command);
    }

    private boolean isDescendantOfSelectedPart(EditPart toTest, Collection selectedParts) {
        EditPart parent = toTest.getParent();
        while (parent != null) {
            if (selectedParts.contains(parent))
                return true;
            parent = parent.getParent();
        }

        return false;
    }

    public boolean updateSelection(IStructuredSelection selection) {
        List filteredSelection = new ArrayList();
        for (Iterator iter = selection.iterator(); iter.hasNext();) {
            EditPart part = (EditPart) iter.next();
            if (helper.isRemovablePart(part) && !isDescendantOfSelectedPart(part, selection.toList()))
                filteredSelection.add(part);
        }

        if (filteredSelection.isEmpty())
            return false; // can't execute

        return super.updateSelection(new StructuredSelection(filteredSelection));
    }

    public Command createCommand(Collection selection) {
        if (!isUserRemovable(selection))
            return UnexecutableCommand.INSTANCE;
        return helper.getDataModel().createCutComponentInstancesCommand((List) helper.makeEObjectList(selection));
    }

    private boolean isUserRemovable(Collection selection) {
        for (Object object : selection) {
            if (object instanceof EditPart) {
                Object model = ((EditPart) object).getModel();
                if (model instanceof EObject) {
                    IDisplayObject displayObject = Adapters.getDisplayObject((EObject) model);
                    if (displayObject != null && !displayObject.isRemovable())
                        return false;
                }
            }
        }
        return true;
    }

}