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annotate dwt/dnd/DragSourceEffect.d @ 45:d8635bb48c7c

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Merge with SWT 3.5
author Jacob Carlborg <doob@me.com>
date Mon, 01 Dec 2008 17:07:00 +0100
parents 1a8b3cb347e0
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1 /*******************************************************************************
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2 * Copyright (c) 2007, 2008 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 *******************************************************************************/
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11 module dwt.dnd.DragSourceEffect;
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13 import dwt.dwthelper.utils;
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15 import dwt.DWT;
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16 import dwt.widgets.Control;
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18 /**
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19 * This class provides default implementations to display a drag source
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20 * effect during a drag and drop operation. The current implementation
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21 * does not provide any visual feedback.
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22 *
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23 * <p>The drag source effect has the same API as the
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24 * <code>DragSourceAdapter</code> so that it can provide custom visual
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25 * feedback when a <code>DragSourceEvent</code> occurs.
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26 * </p>
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27 *
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28 * <p>Classes that wish to provide their own drag source effect such as
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29 * displaying a default source image during a drag can extend the <code>DragSourceEffect</code>
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30 * class, override the <code>DragSourceAdapter.dragStart</code> method and set
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31 * the field <code>DragSourceEvent.image</code> with their own image.
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32 * The image should be disposed when <code>DragSourceAdapter.dragFinished</code> is called.
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33 * </p>
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34 *
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35 * @see DragSourceAdapter
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36 * @see DragSourceEvent
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37 * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
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38 *
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39 * @since 3.3
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40 */
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41 public class DragSourceEffect extends DragSourceAdapter {
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42 Control control = null;
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43
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44 /**
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45 * Creates a new <code>DragSourceEffect</code> to handle drag effect from the specified <code>Control</code>.
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46 *
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47 * @param control the <code>Control</code> that the user clicks on to initiate the drag
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48 *
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49 * @exception IllegalArgumentException <ul>
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50 * <li>ERROR_NULL_ARGUMENT - if the control is null</li>
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51 * </ul>
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52 */
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53 public DragSourceEffect(Control control) {
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54 if (control is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
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55 this.control = control;
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56 }
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57
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58 /**
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59 * Returns the Control which is registered for this DragSourceEffect. This is the control that the
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60 * user clicks in to initiate dragging.
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61 *
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62 * @return the Control which is registered for this DragSourceEffect
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63 */
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64 public Control getControl() {
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65 return control;
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66 }
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67 }