eu.geclipse.ui.internal.actions.PasteAction.java Source code

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Here is the source code for eu.geclipse.ui.internal.actions.PasteAction.java

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/*****************************************************************************
 * Copyright (c) 2006, 2007 g-Eclipse Consortium 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Initial development of the original code was made for the
 * g-Eclipse project founded by European Union
 * project number: FP6-IST-034327  http://www.geclipse.eu/
 *
 * Contributors:
 *    Mathias Stuempert - initial API and implementation
 *****************************************************************************/

package eu.geclipse.ui.internal.actions;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.dnd.TransferData;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.views.navigator.LocalSelectionTransfer;

import eu.geclipse.core.model.IGridContainer;
import eu.geclipse.core.model.IGridElement;
import eu.geclipse.ui.internal.transfer.GridElementTransferOperation;

/**
 * Paste action for the copy/paste machanism.
 */
public class PasteAction extends TransferAction {

    /**
     * Create a new paste action for the specified view using the specified
     * clipboard.
     * 
     * @param clipboard The {@link Clipboard} used for the copy/paste operation.
     */
    public PasteAction(final Clipboard clipboard) {
        super(Messages.getString("PasteAction.paste_action_text"), clipboard); //$NON-NLS-1$
        ISharedImages sharedImages = PlatformUI.getWorkbench().getSharedImages();
        ImageDescriptor pasteImage = sharedImages.getImageDescriptor(ISharedImages.IMG_TOOL_PASTE);
        setImageDescriptor(pasteImage);
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.action.Action#run()
     */
    @Override
    public void run() {
        Clipboard clipboard = getClipboard();
        LocalSelectionTransfer transfer = LocalSelectionTransfer.getInstance();
        IStructuredSelection source = (IStructuredSelection) clipboard.getContents(transfer);
        IStructuredSelection target = getStructuredSelection();
        startTransfer(source, target);
    }

    protected void startTransfer(final IStructuredSelection source, final IStructuredSelection target) {

        if (!isEmpty(source) && !(isEmpty(target))) {

            Object[] sourceArray = source.toArray();
            IGridElement[] sourceElements = new IGridElement[source.size()];

            for (int i = 0; i < sourceArray.length; i++) {

                if (sourceArray[i] instanceof IGridElement) {
                    sourceElements[i] = (IGridElement) sourceArray[i];
                } else {
                    // TODO mathias error handling
                }

            }

            Object targetObject = target.getFirstElement();
            IGridContainer targetContainer = null;

            if (targetObject instanceof IGridContainer) {
                targetContainer = (IGridContainer) targetObject;
            } else {
                // TODO mathias error handling
            }

            if (targetContainer != null) {
                startTransfer(sourceElements, targetContainer);
            }

        }

    }

    protected void startTransfer(final IGridElement[] sources, final IGridContainer target) {

        GridElementTransferOperation op = new GridElementTransferOperation(sources, target, false);
        op.setUser(true);
        op.schedule();

    }

    /* (non-Javadoc)
     * @see org.eclipse.ui.actions.BaseSelectionListenerAction#updateSelection(org.eclipse.jface.viewers.IStructuredSelection)
     */
    @Override
    protected boolean updateSelection(final IStructuredSelection selection) {

        boolean result = super.updateSelection(selection);

        if (result && (selection.size() == 1) && (selection.getFirstElement() instanceof IGridContainer)) {

            Clipboard clipboard = getClipboard();
            TransferData[] data = clipboard.getAvailableTypes();
            LocalSelectionTransfer transfer = LocalSelectionTransfer.getInstance();

            result = false;

            for (TransferData d : data) {
                if (transfer.isSupportedType(d)) {
                    result = true;
                    break;
                }
            }

        }

        return result;

    }

    private boolean isEmpty(final ISelection selection) {
        return (selection == null) || (selection.isEmpty());
    }

}