1 /* 2 * Copyright (c) 2003, 2005, Oracle and/or its affiliates. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /** 27 * This class is a placeholder for all internal static objects that represent 28 * system state. We keep our representation up-to-date with actual system 29 * state by tracking events, such as X Focus, Component under cursor etc. 30 * All attributes should be private static with accessors to simpify change 31 * tracking. 32 */ 33 package sun.awt.X11; 34 35 import java.awt.Component; 36 import java.lang.ref.WeakReference; 37 38 class XAwtState { 39 /** 40 * The mouse is over this component. 41 * If the component is not disabled, it received MOUSE_ENTERED but no MOUSE_EXITED. 42 */ 43 private static WeakReference<Component> componentMouseEnteredRef = null; 44 setComponentMouseEntered(Component component)45 static void setComponentMouseEntered(Component component) { 46 XToolkit.awtLock(); 47 try { 48 if (component == null) { 49 componentMouseEnteredRef = null; 50 return; 51 } 52 if (component != getComponentMouseEntered()) { 53 componentMouseEnteredRef = new WeakReference<>(component); 54 } 55 } finally { 56 XToolkit.awtUnlock(); 57 } 58 } 59 getComponentMouseEntered()60 static Component getComponentMouseEntered() { 61 XToolkit.awtLock(); 62 try { 63 if (componentMouseEnteredRef == null) { 64 return null; 65 } 66 return componentMouseEnteredRef.get(); 67 } finally { 68 XToolkit.awtUnlock(); 69 } 70 } 71 72 /** 73 * The XBaseWindow is created with OwnerGrabButtonMask 74 * (see X vol. 1, 8.3.3.2) so inside the app Key, Motion, and Button events 75 * are received by the window they actualy happened on, not the grabber. 76 * Then XBaseWindow dispatches them to the grabber. As a result 77 * XAnyEvent.get_window() returns actual window the event is originated, 78 * though the event is dispatched by the grabber. 79 */ 80 private static boolean inManualGrab = false; 81 isManualGrab()82 static boolean isManualGrab() { 83 return inManualGrab; 84 } 85 86 private static WeakReference<XBaseWindow> grabWindowRef = null; 87 88 /** 89 * The X Active Grab overrides any other active grab by the same 90 * client see XGrabPointer, XGrabKeyboard 91 */ setGrabWindow(XBaseWindow grabWindow)92 static void setGrabWindow(XBaseWindow grabWindow) { 93 setGrabWindow(grabWindow, false); 94 } 95 96 /** 97 * Automatic passive grab doesn't override active grab see XGrabButton 98 */ setAutoGrabWindow(XBaseWindow grabWindow)99 static void setAutoGrabWindow(XBaseWindow grabWindow) { 100 setGrabWindow(grabWindow, true); 101 } 102 setGrabWindow(XBaseWindow grabWindow, boolean isAutoGrab)103 private static void setGrabWindow(XBaseWindow grabWindow, boolean isAutoGrab) { 104 XToolkit.awtLock(); 105 try { 106 if (inManualGrab && isAutoGrab) { 107 return; 108 } 109 inManualGrab = grabWindow != null && !isAutoGrab; 110 if (grabWindow == null) { 111 grabWindowRef = null; 112 return; 113 } 114 if (grabWindow != getGrabWindow()) { 115 grabWindowRef = new WeakReference<>(grabWindow); 116 } 117 } finally { 118 XToolkit.awtUnlock(); 119 } 120 } 121 getGrabWindow()122 static XBaseWindow getGrabWindow() { 123 XToolkit.awtLock(); 124 try { 125 if (grabWindowRef == null) { 126 return null; 127 } 128 XBaseWindow xbw = grabWindowRef.get(); 129 if( xbw != null && xbw.isDisposed() ) { 130 xbw = null; 131 grabWindowRef = null; 132 }else if( xbw == null ) { 133 grabWindowRef = null; 134 } 135 return xbw; 136 } finally { 137 XToolkit.awtUnlock(); 138 } 139 } 140 } 141