ChatDropTarget.java

/****************************************************************************
 * Copyright (c) 2004 Composent, Inc. and others.
 * 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
 *
 * Contributors:
 *    Composent, Inc. - initial API and implementation
 *****************************************************************************/

package org.eclipse.ecf.internal.example.collab.ui;

import java.io.File;

import org.eclipse.ecf.core.identity.ID;
import org.eclipse.ecf.core.user.IUser;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DropTarget;
import org.eclipse.swt.dnd.DropTargetEvent;
import org.eclipse.swt.dnd.DropTargetListener;
import org.eclipse.swt.dnd.FileTransfer;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.dnd.Transfer;
import org.eclipse.swt.widgets.Control;

class ChatDropTarget implements DropTargetListener {
	private final LineChatClientView view;
	DropTarget dropTarget = null;
	TextTransfer textTransfer = null;
	FileTransfer fileTransfer = null;
	ChatComposite composite = null;
	IUser selectedUser = null;

	public ChatDropTarget(LineChatClientView view, Control control,
			ChatComposite comp) {
		dropTarget = new DropTarget(control, DND.DROP_MOVE | DND.DROP_COPY
				| DND.DROP_DEFAULT);
		this.view = view;
		textTransfer = TextTransfer.getInstance();
		fileTransfer = FileTransfer.getInstance();
		Transfer[] types = new Transfer[] { fileTransfer, textTransfer };
		dropTarget.setTransfer(types);
		dropTarget.addDropListener(this);
		composite = comp;
	}

	public void dragEnter(DropTargetEvent event) {
		if (event.detail == DND.DROP_DEFAULT) {
			if ((event.operations & DND.DROP_COPY) != 0) {
				event.detail = DND.DROP_COPY;
			} else {
				event.detail = DND.DROP_NONE;
			}
		}
		// will accept text but prefer to have files dropped
		for (int i = 0; i < event.dataTypes.length; i++) {
			if (fileTransfer.isSupportedType(event.dataTypes[i])) {
				event.currentDataType = event.dataTypes[i];
				// files should only be copied
				if (event.detail != DND.DROP_COPY) {
					event.detail = DND.DROP_NONE;
				}
				break;
			}
		}
	}

	public void dragOver(DropTargetEvent event) {
		event.feedback = DND.FEEDBACK_SELECT | DND.FEEDBACK_SCROLL;
	}

	public void dragOperationChanged(DropTargetEvent event) {
		if (event.detail == DND.DROP_DEFAULT) {
			if ((event.operations & DND.DROP_COPY) != 0) {
				event.detail = DND.DROP_COPY;
			} else {
				event.detail = DND.DROP_NONE;
			}
		}
		// allow text to be moved but files should only be copied
		if (fileTransfer.isSupportedType(event.currentDataType)) {
			if (event.detail != DND.DROP_COPY) {
				event.detail = DND.DROP_NONE;
			}
		}
	}

	public void dragLeave(DropTargetEvent event) {
	}

	public void dropAccept(DropTargetEvent event) {
	}

	public void drop(DropTargetEvent event) {
		if (fileTransfer.isSupportedType(event.currentDataType)) {
			String[] files = (String[]) event.data;
			for (int i = 0; i < files.length; i++) {
				ID target = (selectedUser == null) ? null : selectedUser
						.getID();
				// Send file to user
				File file = new File(files[i]);
				if (file.exists() && !file.isDirectory() && composite != null) {
					composite.sendFile(file.getPath(), this.view.downloaddir
							+ File.separatorChar + file.getName(), null,
							target, false);

				}
			}
		}
	}
}