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 */
33package sun.awt.X11;
34
35import java.awt.Component;
36import java.lang.ref.WeakReference;
37
38class 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
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
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
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     */
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     */
99    static void setAutoGrabWindow(XBaseWindow grabWindow) {
100        setGrabWindow(grabWindow, true);
101    }
102
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
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