jdk/src/solaris/classes/sun/awt/X11/XAwtState.java
author yan
Mon, 06 Oct 2008 16:45:00 +0400
changeset 1966 12a51fb0db0d
parent 2 90ce3da70b43
child 5506 202f599c92aa
permissions -rw-r--r--
5100701: Toolkit.getLockingKeyState() does not work on XToolkit, but works on Motif Summary: Does not work on Motif but works on XToolkit now; implemented using XQueryPointer. Reviewed-by: anthony
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/*
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 * Copyright 2003-2005 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Sun designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Sun in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 */
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/**
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 * This class is a placeholder for all internal static objects that represent
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 * system state. We keep our representation up-to-date with actual system
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 * state by tracking events, such as X Focus, Component under cursor etc.
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 * All attributes should be static private with accessors to simpify change
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 * tracking.
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 */
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package sun.awt.X11;
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import java.awt.Component;
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import java.lang.ref.WeakReference;
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class XAwtState {
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    /**
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     * The mouse is over this component.
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     * If the component is not disabled, it received MOUSE_ENTERED but no MOUSE_EXITED.
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     */
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    private static WeakReference componentMouseEnteredRef = null;
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    static void setComponentMouseEntered(Component component) {
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        XToolkit.awtLock();
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        try {
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            if (component == null) {
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                componentMouseEnteredRef = null;
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                return;
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            }
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            if (component != getComponentMouseEntered()) {
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                componentMouseEnteredRef = new WeakReference(component);
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            }
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        } finally {
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            XToolkit.awtUnlock();
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        }
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    }
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    static Component getComponentMouseEntered() {
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        XToolkit.awtLock();
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        try {
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            if (componentMouseEnteredRef == null) {
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                return null;
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            }
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            return (Component)componentMouseEnteredRef.get();
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        } finally {
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            XToolkit.awtUnlock();
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        }
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    }
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    /**
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     * The XBaseWindow is created with OwnerGrabButtonMask
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     * (see X vol. 1, 8.3.3.2) so inside the app Key, Motion, and Button events
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     * are received by the window they actualy happened on, not the grabber.
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     * Then XBaseWindow dispatches them to the grabber. As a result
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     * XAnyEvent.get_window() returns actual window the event is originated,
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     * though the event is dispatched by  the grabber.
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     */
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    private static boolean inManualGrab = false;
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    static boolean isManualGrab() {
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        return inManualGrab;
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    }
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    private static WeakReference grabWindowRef = null;
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    /**
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     * The X Active Grab overrides any other active grab by the same
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     * client see XGrabPointer, XGrabKeyboard
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     */
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    static void setGrabWindow(XBaseWindow grabWindow) {
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        setGrabWindow(grabWindow, false);
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    }
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    /**
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     * Automatic passive grab doesn't override active grab see XGrabButton
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     */
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    static void setAutoGrabWindow(XBaseWindow grabWindow) {
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        setGrabWindow(grabWindow, true);
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    }
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    private static void setGrabWindow(XBaseWindow grabWindow, boolean isAutoGrab) {
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        XToolkit.awtLock();
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        try {
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            if (inManualGrab && isAutoGrab) {
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                return;
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            }
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            inManualGrab = grabWindow != null && !isAutoGrab;
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            if (grabWindow == null) {
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                grabWindowRef = null;
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                return;
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            }
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            if (grabWindow != getGrabWindow()) {
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                grabWindowRef = new WeakReference(grabWindow);
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            }
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        } finally {
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            XToolkit.awtUnlock();
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        }
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    }
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    static XBaseWindow getGrabWindow() {
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        XToolkit.awtLock();
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        try {
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            if (grabWindowRef == null) {
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                return null;
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            }
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            XBaseWindow xbw = (XBaseWindow)grabWindowRef.get();
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            if( xbw != null && xbw.isDisposed() ) {
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                xbw = null;
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                grabWindowRef = null;
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            }else if( xbw == null ) {
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                grabWindowRef = null;
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            }
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            return xbw;
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        } finally {
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            XToolkit.awtUnlock();
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        }
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    }
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}