1 files changed, 204 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/TableDropTargetEffect.java b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/TableDropTargetEffect.java
new file mode 100644
index 0000000000..6d27948cc1
--- /dev/null
+++ b/bundles/org.eclipse.swt/Eclipse SWT Drag and Drop/win32/org/eclipse/swt/dnd/TableDropTargetEffect.java
@@ -0,0 +1,204 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2008 IBM Corporation 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:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.swt.dnd;
+
+import org.eclipse.swt.graphics.*;
+import org.eclipse.swt.internal.win32.*;
+import org.eclipse.swt.widgets.*;
+
+/**
+ * This class provides a default drag under effect (eg. select, insert and scroll) 
+ * when a drag occurs over a <code>Table</code>.
+ * 
+ * <p>Classes that wish to provide their own drag under effect for a <code>Table</code>
+ * can extend the <code>TableDropTargetEffect</code> and override any applicable methods 
+ * in <code>TableDropTargetEffect</code> to display their own drag under effect.</p>
+ * 
+ * Subclasses that override any methods of this class must call the corresponding
+ * <code>super</code> method to get the default drag under effect implementation.
+ *
+ * <p>The feedback value is either one of the FEEDBACK constants defined in 
+ * class <code>DND</code> which is applicable to instances of this class, 
+ * or it must be built by <em>bitwise OR</em>'ing together 
+ * (that is, using the <code>int</code> "|" operator) two or more
+ * of those <code>DND</code> effect constants. 
+ * </p>
+ * <p>
+ * <dl>
+ * <dt><b>Feedback:</b></dt>
+ * <dd>FEEDBACK_SELECT, FEEDBACK_SCROLL</dd>
+ * </dl>
+ * </p>
+ * 
+ * @see DropTargetAdapter
+ * @see DropTargetEvent
+ * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
+ * 
+ * @since 3.3
+ */
+public class TableDropTargetEffect extends DropTargetEffect {
+	static final int SCROLL_HYSTERESIS = 200; // milli seconds
+	
+	int scrollIndex = -1;
+	long scrollBeginTime;
+	TableItem dropHighlight;
+
+	/**
+	 * Creates a new <code>TableDropTargetEffect</code> to handle the drag under effect on the specified 
+	 * <code>Table</code>.
+	 * 
+	 * @param table the <code>Table</code> over which the user positions the cursor to drop the data
+	 */
+	public TableDropTargetEffect(Table table) {
+		super(table);
+	}
+
+	int checkEffect(int effect) {
+		// Some effects are mutually exclusive.  Make sure that only one of the mutually exclusive effects has been specified.
+		if ((effect & DND.FEEDBACK_SELECT) != 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER & ~DND.FEEDBACK_INSERT_BEFORE;
+		if ((effect & DND.FEEDBACK_INSERT_BEFORE) != 0) effect = effect & ~DND.FEEDBACK_INSERT_AFTER;
+		return effect;
+	}
+
+	/**
+	 * This implementation of <code>dragEnter</code> provides a default drag under effect
+	 * for the feedback specified in <code>event.feedback</code>.
+	 * 
+	 * For additional information see <code>DropTargetAdapter.dragEnter</code>.
+	 * 
+	 * Subclasses that override this method should call <code>super.dragEnter(event)</code>
+	 * to get the default drag under effect implementation.
+	 *
+	 * @param event  the information associated with the drag enter event
+	 * 
+	 * @see DropTargetAdapter
+	 * @see DropTargetEvent
+	 */
+	public void dragEnter(DropTargetEvent event) {
+		scrollBeginTime = 0;
+		scrollIndex = -1;
+		dropHighlight = null;
+	}
+	
+	/**
+	 * This implementation of <code>dragLeave</code> provides a default drag under effect
+	 * for the feedback specified in <code>event.feedback</code>. 
+	 * 
+	 * For additional information see <code>DropTargetAdapter.dragLeave</code>.
+	 * 
+	 * Subclasses that override this method should call <code>super.dragLeave(event)</code>
+	 * to get the default drag under effect implementation.
+	 *
+	 * @param event  the information associated with the drag leave event
+	 * 
+	 * @see DropTargetAdapter
+	 * @see DropTargetEvent
+	 */
+	public void dragLeave(DropTargetEvent event) {
+		Table table = (Table) control;
+		int /*long*/ handle = table.handle;
+		if (dropHighlight != null) {
+			LVITEM lvItem = new LVITEM ();
+			lvItem.stateMask = OS.LVIS_DROPHILITED;
+			OS.SendMessage(handle, OS.LVM_SETITEMSTATE, -1, lvItem);		
+			dropHighlight = null;
+		}
+		scrollBeginTime = 0;
+		scrollIndex = -1;
+	}
+
+	/**
+	 * This implementation of <code>dragOver</code> provides a default drag under effect
+	 * for the feedback specified in <code>event.feedback</code>. The class description 
+	 * lists the FEEDBACK constants that are applicable to the class.
+	 * 
+	 * For additional information see <code>DropTargetAdapter.dragOver</code>.
+	 * 
+	 * Subclasses that override this method should call <code>super.dragOver(event)</code>
+	 * to get the default drag under effect implementation.
+	 *
+	 * @param event  the information associated with the drag over event
+	 * 
+	 * @see DropTargetAdapter
+	 * @see DropTargetEvent
+	 * @see DND#FEEDBACK_SELECT
+	 * @see DND#FEEDBACK_SCROLL
+	 */
+	public void dragOver(DropTargetEvent event) {
+		Table table = (Table) getControl();
+		int effect = checkEffect(event.feedback);
+		int /*long*/ handle = table.handle;
+		Point coordinates = new Point(event.x, event.y);
+		coordinates = table.toControl(coordinates);
+		LVHITTESTINFO pinfo = new LVHITTESTINFO();
+		pinfo.x = coordinates.x;
+		pinfo.y = coordinates.y;
+		OS.SendMessage(handle, OS.LVM_HITTEST, 0, pinfo);	
+		if ((effect & DND.FEEDBACK_SCROLL) == 0) {
+			scrollBeginTime = 0;
+			scrollIndex = -1;
+		} else {
+			if (pinfo.iItem != -1 && scrollIndex == pinfo.iItem && scrollBeginTime != 0) {
+				if (System.currentTimeMillis() >= scrollBeginTime) {
+					int top = Math.max (0, (int)/*64*/OS.SendMessage (handle, OS.LVM_GETTOPINDEX, 0, 0));
+					int count = (int)/*64*/OS.SendMessage (handle, OS.LVM_GETITEMCOUNT, 0, 0);
+					int index = (scrollIndex - 1 < top) ? Math.max(0, scrollIndex - 1) : Math.min(count - 1, scrollIndex + 1);
+					boolean scroll = true;
+					if (pinfo.iItem == top) {
+						scroll = pinfo.iItem != index;
+					} else {
+						RECT itemRect = new RECT ();
+						itemRect.left = OS.LVIR_BOUNDS;
+						if (OS.SendMessage (handle, OS.LVM_GETITEMRECT, pinfo.iItem, itemRect) != 0) {
+							RECT rect = new RECT ();
+							OS.GetClientRect (handle, rect);
+							POINT pt = new POINT ();
+							pt.x = itemRect.left;
+							pt.y = itemRect.top;
+							if (OS.PtInRect (rect, pt)) {
+								pt.y = itemRect.bottom;
+								if (OS.PtInRect (rect, pt)) scroll = false;
+							}
+						}
+					}
+					if (scroll) {
+						OS.SendMessage (handle, OS.LVM_ENSUREVISIBLE, index, 0);
+						table.redraw();
+					}
+					scrollBeginTime = 0;
+					scrollIndex = -1;
+				}
+			} else {
+				scrollBeginTime = System.currentTimeMillis() + SCROLL_HYSTERESIS;
+				scrollIndex = pinfo.iItem;
+			}
+		}
+		
+		if (pinfo.iItem != -1 && (effect & DND.FEEDBACK_SELECT) != 0) {
+			TableItem item = table.getItem(pinfo.iItem);
+			if (dropHighlight != item) {
+				LVITEM lvItem = new LVITEM();
+				lvItem.stateMask = OS.LVIS_DROPHILITED;
+				OS.SendMessage(handle, OS.LVM_SETITEMSTATE, -1, lvItem);		
+				lvItem.state = OS.LVIS_DROPHILITED;
+				OS.SendMessage(handle, OS.LVM_SETITEMSTATE, pinfo.iItem, lvItem);
+				dropHighlight = item;
+			}
+		} else {
+			if (dropHighlight != null) {
+				LVITEM lvItem = new LVITEM ();
+				lvItem.stateMask = OS.LVIS_DROPHILITED;
+				OS.SendMessage(handle, OS.LVM_SETITEMSTATE, -1, lvItem);		
+				dropHighlight = null;
+			}
+		}
+	}
+}