J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | package sun.awt; |
| 26 | |
| 27 | import java.awt.Component; |
| 28 | import java.awt.Rectangle; |
| 29 | import java.awt.event.PaintEvent; |
| 30 | |
| 31 | /** |
| 32 | * PaintEventDispatcher is responsible for dispatching PaintEvents. There |
| 33 | * can be only one PaintEventDispatcher active at a particular time. |
| 34 | * |
| 35 | */ |
| 36 | public class PaintEventDispatcher { |
| 37 | /** |
| 38 | * Singleton dispatcher. |
| 39 | */ |
| 40 | private static PaintEventDispatcher dispatcher; |
| 41 | |
| 42 | /** |
| 43 | * Sets the current <code>PaintEventDispatcher</code>. |
| 44 | * |
| 45 | * @param dispatcher PaintEventDispatcher |
| 46 | */ |
| 47 | public static void setPaintEventDispatcher( |
| 48 | PaintEventDispatcher dispatcher) { |
| 49 | synchronized(PaintEventDispatcher.class) { |
| 50 | PaintEventDispatcher.dispatcher = dispatcher; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | /** |
| 55 | * Returns the currently active <code>PaintEventDispatcher</code>. This |
| 56 | * will never return null. |
| 57 | * |
| 58 | * @return PaintEventDispatcher |
| 59 | */ |
| 60 | public static PaintEventDispatcher getPaintEventDispatcher() { |
| 61 | synchronized(PaintEventDispatcher.class) { |
| 62 | if (dispatcher == null) { |
| 63 | dispatcher = new PaintEventDispatcher(); |
| 64 | } |
| 65 | return dispatcher; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Creates and returns the <code>PaintEvent</code> that should be |
| 71 | * dispatched for the specified component. If this returns null |
| 72 | * no <code>PaintEvent</code> is dispatched. |
| 73 | * <p> |
| 74 | * <b>WARNING:</b> This is invoked from the native thread, be careful |
| 75 | * what methods you end up invoking here. |
| 76 | */ |
| 77 | public PaintEvent createPaintEvent(Component target, int x, int y, int w, |
| 78 | int h) { |
| 79 | |
| 80 | return new PaintEvent((Component)target, PaintEvent.PAINT, |
| 81 | new Rectangle(x, y, w, h)); |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Returns true if a native background erase should be done for |
| 86 | * the specified Component. |
| 87 | */ |
| 88 | public boolean shouldDoNativeBackgroundErase(Component c) { |
| 89 | return true; |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * This method is invoked from the toolkit thread when the surface |
| 94 | * data of the component needs to be replaced. The method run() of |
| 95 | * the Runnable argument performs surface data replacing, run() |
| 96 | * should be invoked on the EDT of this component's AppContext. |
| 97 | * Returns true if the Runnable has been enqueued to be invoked |
| 98 | * on the EDT. |
| 99 | * (Fix 6255371.) |
| 100 | */ |
| 101 | public boolean queueSurfaceDataReplacing(Component c, Runnable r) { |
| 102 | return false; |
| 103 | } |
| 104 | } |