/* * Copyright (c) 1998, 1999, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package java.awt.dnd; import java.awt.Insets;import java.awt.Point; /** * During DnD operations it is possible that a user may wish to drop the * subject of the operation on a region of a scrollable GUI control that is * not currently visible to the user. * <p> * In such situations it is desirable that the GUI control detect this * and institute a scroll operation in order to make obscured region(s) * visible to the user. This feature is known as autoscrolling. * <p> * If a GUI control is both an active <code>DropTarget</code> * and is also scrollable, it * can receive notifications of autoscrolling gestures by the user from * the DnD system by implementing this interface. * <p> * An autoscrolling gesture is initiated by the user by keeping the drag * cursor motionless with a border region of the <code>Component</code>, * referred to as * the "autoscrolling region", for a predefined period of time, this will * result in repeated scroll requests to the <code>Component</code> * until the drag <code>Cursor</code> resumes its motion. * * @since 1.2 */ public interface Autoscroll {     /**     * This method returns the <code>Insets</code> describing     * the autoscrolling region or border relative     * to the geometry of the implementing Component.     * <P>     * This value is read once by the <code>DropTarget</code>     * upon entry of the drag <code>Cursor</code>     * into the associated <code>Component</code>.     * <P>     * @return the Insets     */     public Insets getAutoscrollInsets();     /**     * notify the <code>Component</code> to autoscroll     * <P>     * @param cursorLocn A <code>Point</code> indicating the     * location of the cursor that triggered this operation.     */     public void autoscroll(Point cursorLocn); }