/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/

package org.eclipse.ui.views.properties;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.SWTError;
import org.eclipse.swt.dnd.Clipboard;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.ui.help.WorkbenchHelp;

/**
 * Copies a property to the clipboard.
 */
/*package*/class CopyPropertyAction extends PropertySheetAction {
    /**
     * System clipboard
     */
    private Clipboard clipboard;

    /**
     * Creates the action.
     */
    public CopyPropertyAction(PropertySheetViewer viewer, String name,
            Clipboard clipboard) {
        super(viewer, name);
        WorkbenchHelp.setHelp(this,
                IPropertiesHelpContextIds.COPY_PROPERTY_ACTION);
        this.clipboard = clipboard;
    }

    /**
     * Performs this action.
     */
    public void run() {
        // Get the selected property
        IStructuredSelection selection = (IStructuredSelection) getPropertySheet()
                .getSelection();
        if (selection.isEmpty())
            return;
        // Assume single selection
        IPropertySheetEntry entry = (IPropertySheetEntry) selection
                .getFirstElement();

        // Place text on the clipboard
        StringBuffer buffer = new StringBuffer();
        buffer.append(entry.getDisplayName());
        buffer.append("\t"); //$NON-NLS-1$
        buffer.append(entry.getValueAsString());

        setClipboard(buffer.toString());
    }

    /** 
     * Updates enablement based on the current selection
     */
    public void selectionChanged(IStructuredSelection sel) {
        setEnabled(!sel.isEmpty());
    }

    private void setClipboard(String text) {
        try {
            Object[] data = new Object[] { text };
            Transfer[] transferTypes = new Transfer[] { TextTransfer
                    .getInstance() };
            clipboard.setContents(data, transferTypes);
        } catch (SWTError e) {
            if (e.code != DND.ERROR_CANNOT_SET_CLIPBOARD)
                throw e;
            if (MessageDialog.openQuestion(getPropertySheet().getControl()
                    .getShell(), PropertiesMessages
                    .getString("CopyToClipboardProblemDialog.title"), //$NON-NLS-1$
                    PropertiesMessages
                            .getString("CopyToClipboardProblemDialog.message"))) //$NON-NLS-1$
                setClipboard(text);
        }
    }
}