/**********************************************************************
Copyright (c) 2000, 2002 IBM Corp. 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 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.*;
import org.eclipse.ui.help.WorkbenchHelp;
import org.eclipse.ui.internal.WorkbenchMessages;

/**
 * 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(), WorkbenchMessages.getString("CopyToClipboardProblemDialog.title"), WorkbenchMessages.getString("CopyToClipboardProblemDialog.message"))) //$NON-NLS-1$ //$NON-NLS-2$
				setClipboard(text);
		}	
	}
}