1 /*

     2  * Copyright 1999-2004 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 

    26 package sun.awt.motif;

    27 

    28 import java.awt.*;

    29 import sun.awt.GlobalCursorManager;

    30 import sun.awt.GlobalCursorManager.*;

    31 

    32 public final class MGlobalCursorManager extends GlobalCursorManager {

    33 

    34     static {

    35         cacheInit();

    36     }

    37 

    38     private native static void cacheInit();

    39 

    40     // cached nativeContainer

    41     private Component nativeContainer;

    42 

    43 

    44     /**

    45      * The MGlobalCursorManager is a singleton.

    46      */

    47     private static MGlobalCursorManager manager;

    48 

    49 

    50     static GlobalCursorManager getCursorManager() {

    51         if (manager == null) {

    52             manager = new MGlobalCursorManager();

    53         }

    54         return manager;

    55     }

    56 

    57     /**

    58      * Should be called in response to a native mouse enter or native mouse

    59      * button released message. Should not be called during a mouse drag.

    60      */

    61     static void nativeUpdateCursor(Component heavy) {

    62         MGlobalCursorManager.getCursorManager().updateCursorLater(heavy);

    63     }

    64 

    65 

    66     protected void setCursor(Component comp, Cursor cursor, boolean useCache) {

    67         if (comp == null) {

    68             return;

    69         }

    70 

    71         Cursor cur = useCache ? cursor : getCapableCursor(comp);

    72 

    73         Component nc = useCache ? nativeContainer : getNativeContainer(comp);

    74 

    75         // System.out.println(" set cursor="+cursor+"  on "+comp+"  new curs="+cur);

    76         if (nc != null && nc.isDisplayable()) {

    77             nativeContainer = nc;

    78             ((MComponentPeer)nc.getPeer()).pSetCursor(cur);

    79         }

    80     }

    81 

    82     private Component getNativeContainer(Component comp) {

    83         while (comp != null && comp.isLightweight()) {

    84             comp = comp.getParent();

    85         }

    86         return comp;

    87     }

    88 

    89     protected native void getCursorPos(Point p);

    90     protected native Component findHeavyweightUnderCursor();

    91 

    92     /*

    93      * two native methods to call corresponding methods in Container and

    94      * Component

    95      */

    96     protected native Component findComponentAt(Container con, int x, int y);

    97     protected native Point getLocationOnScreen(Component com);

    98 

    99     protected Component findHeavyweightUnderCursor(boolean useCache) {

   100         return findHeavyweightUnderCursor();

   101     }

   102 

   103     private Cursor getCapableCursor(Component comp) {

   104         Component c = comp;

   105         while ((c != null) && !(c instanceof Window) &&

   106                c.isEnabled() && c.isVisible() && c.isDisplayable()) {

   107             c = c.getParent();

   108         }

   109         if (c instanceof Window) {

   110             return (c.isEnabled() && c.isVisible() && c.isDisplayable() && comp.isEnabled()) ?

   111                     comp.getCursor() :

   112                     Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR);

   113         } else if (c == null) {

   114             return null;

   115         }

   116         return getCapableCursor(c.getParent());

   117     }

   118 }