Java example source code file (MotifDnDConstants.java)
The MotifDnDConstants.java Java example source code/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
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*
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package sun.awt.X11;
import java.awt.dnd.DnDConstants;
import java.nio.ByteOrder;
import java.util.Arrays;
import sun.misc.Unsafe;
/**
* Motif DnD protocol global constants and convenience routines.
*
* @since 1.5
*/
class MotifDnDConstants {
// utility class can not be instantiated
private MotifDnDConstants() {}
// Note that offsets in all native structures below do not depend on the
// architecture.
private static final Unsafe unsafe = XlibWrapper.unsafe;
static final XAtom XA_MOTIF_ATOM_0 = XAtom.get("_MOTIF_ATOM_0");
static final XAtom XA_MOTIF_DRAG_WINDOW = XAtom.get("_MOTIF_DRAG_WINDOW");
static final XAtom XA_MOTIF_DRAG_TARGETS = XAtom.get("_MOTIF_DRAG_TARGETS");
static final XAtom XA_MOTIF_DRAG_INITIATOR_INFO =
XAtom.get("_MOTIF_DRAG_INITIATOR_INFO");
static final XAtom XA_MOTIF_DRAG_RECEIVER_INFO =
XAtom.get("_MOTIF_DRAG_RECEIVER_INFO");
static final XAtom XA_MOTIF_DRAG_AND_DROP_MESSAGE =
XAtom.get("_MOTIF_DRAG_AND_DROP_MESSAGE");
static final XAtom XA_XmTRANSFER_SUCCESS =
XAtom.get("XmTRANSFER_SUCCESS");
static final XAtom XA_XmTRANSFER_FAILURE =
XAtom.get("XmTRANSFER_FAILURE");
static final XSelection MotifDnDSelection = new XSelection(XA_MOTIF_ATOM_0);
public static final byte MOTIF_DND_PROTOCOL_VERSION = 0;
/* Supported protocol styles */
public static final int MOTIF_PREFER_PREREGISTER_STYLE = 2;
public static final int MOTIF_PREFER_DYNAMIC_STYLE = 4;
public static final int MOTIF_DYNAMIC_STYLE = 5;
public static final int MOTIF_PREFER_RECEIVER_STYLE = 6;
/* Info structure sizes */
public static final int MOTIF_INITIATOR_INFO_SIZE = 8;
public static final int MOTIF_RECEIVER_INFO_SIZE = 16;
/* Sender/reason message masks */
public static final byte MOTIF_MESSAGE_REASON_MASK = (byte)0x7F;
public static final byte MOTIF_MESSAGE_SENDER_MASK = (byte)0x80;
public static final byte MOTIF_MESSAGE_FROM_RECEIVER = (byte)0x80;
public static final byte MOTIF_MESSAGE_FROM_INITIATOR = (byte)0;
/* Message flags masks and shifts */
public static final int MOTIF_DND_ACTION_MASK = 0x000F;
public static final int MOTIF_DND_ACTION_SHIFT = 0;
public static final int MOTIF_DND_STATUS_MASK = 0x00F0;
public static final int MOTIF_DND_STATUS_SHIFT = 4;
public static final int MOTIF_DND_ACTIONS_MASK = 0x0F00;
public static final int MOTIF_DND_ACTIONS_SHIFT = 8;
/* message type constants */
public static final byte TOP_LEVEL_ENTER = 0;
public static final byte TOP_LEVEL_LEAVE = 1;
public static final byte DRAG_MOTION = 2;
public static final byte DROP_SITE_ENTER = 3;
public static final byte DROP_SITE_LEAVE = 4;
public static final byte DROP_START = 5;
public static final byte DROP_FINISH = 6;
public static final byte DRAG_DROP_FINISH = 7;
public static final byte OPERATION_CHANGED = 8;
/* drop action constants */
public static final int MOTIF_DND_NOOP = 0;
public static final int MOTIF_DND_MOVE = 1 << 0;
public static final int MOTIF_DND_COPY = 1 << 1;
public static final int MOTIF_DND_LINK = 1 << 2;
/* drop site status constants */
public static final byte MOTIF_NO_DROP_SITE = (byte)1;
public static final byte MOTIF_INVALID_DROP_SITE = (byte)2;
public static final byte MOTIF_VALID_DROP_SITE = (byte)3;
private static long readMotifWindow() throws XException {
long defaultScreenNumber = XlibWrapper.DefaultScreen(XToolkit.getDisplay());
long defaultRootWindow =
XlibWrapper.RootWindow(XToolkit.getDisplay(), defaultScreenNumber);
long motifWindow = 0;
WindowPropertyGetter wpg = new WindowPropertyGetter(defaultRootWindow,
XA_MOTIF_DRAG_WINDOW,
0, 1,
false,
XConstants.AnyPropertyType);
try {
int status = wpg.execute(XErrorHandler.IgnoreBadWindowHandler.getInstance());
if (status == XConstants.Success &&
wpg.getData() != 0 &&
wpg.getActualType() == XAtom.XA_WINDOW &&
wpg.getActualFormat() == 32 &&
wpg.getNumberOfItems() == 1) {
long data = wpg.getData();
// XID is CARD32.
motifWindow = Native.getLong(data);
}
return motifWindow;
} finally {
wpg.dispose();
}
}
private static long createMotifWindow() throws XException {
assert XToolkit.isAWTLockHeldByCurrentThread();
long defaultScreenNumber =
XlibWrapper.DefaultScreen(XToolkit.getDisplay());
long defaultRootWindow =
XlibWrapper.RootWindow(XToolkit.getDisplay(), defaultScreenNumber);
long motifWindow = 0;
long displayString = XlibWrapper.XDisplayString(XToolkit.getDisplay());
if (displayString == 0) {
throw new XException("XDisplayString returns NULL");
}
long newDisplay = XlibWrapper.XOpenDisplay(displayString);
if (newDisplay == 0) {
throw new XException("XOpenDisplay returns NULL");
}
XlibWrapper.XGrabServer(newDisplay);
try {
XlibWrapper.XSetCloseDownMode(newDisplay, (int)XConstants.RetainPermanent);
XSetWindowAttributes xwa = new XSetWindowAttributes();
try {
xwa.set_override_redirect(true);
xwa.set_event_mask(XConstants.PropertyChangeMask);
motifWindow = XlibWrapper.XCreateWindow(newDisplay, defaultRootWindow,
-10, -10, 1, 1, 0, 0,
XConstants.InputOnly,
XConstants.CopyFromParent,
(XConstants.CWOverrideRedirect |
XConstants.CWEventMask),
xwa.pData);
if (motifWindow == 0) {
throw new XException("XCreateWindow returns NULL");
}
XlibWrapper.XMapWindow(newDisplay, motifWindow);
long data = Native.allocateLongArray(1);
try {
Native.putLong(data, motifWindow);
XErrorHandlerUtil.WITH_XERROR_HANDLER(XErrorHandler.VerifyChangePropertyHandler.getInstance());
XlibWrapper.XChangeProperty(XToolkit.getDisplay(),
defaultRootWindow,
XA_MOTIF_DRAG_WINDOW.getAtom(),
XAtom.XA_WINDOW, 32,
XConstants.PropModeReplace,
data, 1);
XErrorHandlerUtil.RESTORE_XERROR_HANDLER();
if ((XErrorHandlerUtil.saved_error != null) &&
(XErrorHandlerUtil.saved_error.get_error_code() != XConstants.Success)) {
throw new XException("Cannot write motif drag window handle.");
}
return motifWindow;
} finally {
unsafe.freeMemory(data);
}
} finally {
xwa.dispose();
}
} finally {
XlibWrapper.XUngrabServer(newDisplay);
XlibWrapper.XCloseDisplay(newDisplay);
}
}
private static long getMotifWindow() throws XException {
/*
* Note: it is unsafe to cache the motif drag window handle, as another
* client can change the _MOTIF_DRAG_WINDOW property on the root, the handle
* becomes out-of-sync and all subsequent drag operations will fail.
*/
long motifWindow = readMotifWindow();
if (motifWindow == 0) {
motifWindow = createMotifWindow();
}
return motifWindow;
}
public static final class Swapper {
// utility class can not be instantiated
private Swapper() {}
public static short swap(short s) {
return (short)(((s & 0xFF00) >>> 8) | ((s & 0xFF) << 8));
}
public static int swap(int i) {
return ((i & 0xFF000000) >>> 24) | ((i & 0x00FF0000) >>> 8) |
((i & 0x0000FF00) << 8) | ((i & 0x000000FF) << 24);
}
public static short getShort(long data, byte order) {
short s = unsafe.getShort(data);
if (order != MotifDnDConstants.getByteOrderByte()) {
return swap(s);
} else {
return s;
}
}
public static int getInt(long data, byte order) {
int i = unsafe.getInt(data);
if (order != MotifDnDConstants.getByteOrderByte()) {
return swap(i);
} else {
return i;
}
}
}
/**
* DragBSI.h:
*
* typedef struct {
* BYTE byte_order;
* BYTE protocol_version;
* CARD16 num_target_lists B16;
* CARD32 heap_offset B32;
* } xmMotifTargetsPropertyRec;
*/
private static long[][] getTargetListTable(long motifWindow)
throws XException {
WindowPropertyGetter wpg = new WindowPropertyGetter(motifWindow,
XA_MOTIF_DRAG_TARGETS,
0, 100000L,
false,
XA_MOTIF_DRAG_TARGETS.getAtom());
try {
int status = wpg.execute(XErrorHandler.IgnoreBadWindowHandler.getInstance());
if (status != XConstants.Success
|| wpg.getActualType() != XA_MOTIF_DRAG_TARGETS.getAtom()
|| wpg.getData() == 0) {
return null;
}
long data = wpg.getData();
if (unsafe.getByte(data + 1) != MOTIF_DND_PROTOCOL_VERSION) {
return null;
}
boolean swapNeeded = unsafe.getByte(data + 0) != getByteOrderByte();
short numTargetLists = unsafe.getShort(data + 2);
if (swapNeeded) {
numTargetLists = Swapper.swap(numTargetLists);
}
long[][] table = new long[numTargetLists][];
ByteOrder byteOrder = ByteOrder.nativeOrder();
if (swapNeeded) {
byteOrder = (byteOrder == ByteOrder.LITTLE_ENDIAN) ?
ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN;
}
long bufptr = data + 8;
for (short i = 0; i < numTargetLists; i++) {
short numTargets = unsafe.getShort(bufptr);
bufptr += 2;
if (swapNeeded) {
numTargets = Swapper.swap(numTargets);
}
table[i] = new long[numTargets];
for (short j = 0; j < numTargets; j++) {
// NOTE: cannot use Unsafe.getInt(), since it crashes on
// Solaris/Sparc if the address is not a multiple of 4.
int target = 0;
if (byteOrder == ByteOrder.LITTLE_ENDIAN) {
for (int idx = 0; idx < 4; idx++) {
target |= (unsafe.getByte(bufptr + idx) << 8*idx)
& (0xFF << 8*idx);
}
} else {
for (int idx = 0; idx < 4; idx++) {
target |= (unsafe.getByte(bufptr + idx) << 8*(3-idx))
& (0xFF << 8*(3-idx));
}
}
// NOTE: don't need to swap, since we read it in the proper
// order already.
table[i][j] = target;
bufptr += 4;
}
}
return table;
} finally {
wpg.dispose();
}
}
private static void putTargetListTable(long motifWindow, long[][] table)
throws XException {
assert XToolkit.isAWTLockHeldByCurrentThread();
int tableSize = 8; /* The size of leading xmMotifTargetsPropertyRec. */
for (int i = 0; i < table.length; i++) {
tableSize += table[i].length * 4 + 2;
}
long data = unsafe.allocateMemory(tableSize);
try {
// BYTE byte_order;
unsafe.putByte(data + 0, getByteOrderByte());
// BYTE protocol_version;
unsafe.putByte(data + 1, MOTIF_DND_PROTOCOL_VERSION);
// CARD16 num_target_lists B16;
unsafe.putShort(data + 2, (short)table.length);
// CARD32 heap_offset B32;
unsafe.putInt(data + 4, tableSize);
long bufptr = data + 8;
for (int i = 0; i < table.length; i++) {
unsafe.putShort(bufptr, (short)table[i].length);
bufptr += 2;
for (int j = 0; j < table[i].length; j++) {
int target = (int)table[i][j];
// NOTE: cannot use Unsafe.putInt(), since it crashes on
// Solaris/Sparc if the address is not a multiple of 4.
if (ByteOrder.nativeOrder() == ByteOrder.LITTLE_ENDIAN) {
for (int idx = 0; idx < 4; idx++) {
byte b = (byte)((target & (0xFF << (8*idx))) >> (8*idx));
unsafe.putByte(bufptr + idx, b);
}
} else {
for (int idx = 0; idx < 4; idx++) {
byte b = (byte)((target & (0xFF << (8*idx))) >> (8*idx));
unsafe.putByte(bufptr + (3-idx), b);
}
}
bufptr += 4;
}
}
XErrorHandlerUtil.WITH_XERROR_HANDLER(XErrorHandler.VerifyChangePropertyHandler.getInstance());
XlibWrapper.XChangeProperty(XToolkit.getDisplay(),
motifWindow,
XA_MOTIF_DRAG_TARGETS.getAtom(),
XA_MOTIF_DRAG_TARGETS.getAtom(), 8,
XConstants.PropModeReplace,
data, tableSize);
XErrorHandlerUtil.RESTORE_XERROR_HANDLER();
if ((XErrorHandlerUtil.saved_error != null) &&
(XErrorHandlerUtil.saved_error.get_error_code() != XConstants.Success)) {
// Create a new motif window and retry.
motifWindow = createMotifWindow();
XErrorHandlerUtil.WITH_XERROR_HANDLER(XErrorHandler.VerifyChangePropertyHandler.getInstance());
XlibWrapper.XChangeProperty(XToolkit.getDisplay(),
motifWindow,
XA_MOTIF_DRAG_TARGETS.getAtom(),
XA_MOTIF_DRAG_TARGETS.getAtom(), 8,
XConstants.PropModeReplace,
data, tableSize);
XErrorHandlerUtil.RESTORE_XERROR_HANDLER();
if ((XErrorHandlerUtil.saved_error != null) &&
(XErrorHandlerUtil.saved_error.get_error_code() != XConstants.Success)) {
throw new XException("Cannot write motif drag targets property.");
}
}
} finally {
unsafe.freeMemory(data);
}
}
static int getIndexForTargetList(long[] formats) throws XException {
assert XToolkit.isAWTLockHeldByCurrentThread();
if (formats.length > 0) {
// Make a defensive copy.
formats = (long[])formats.clone();
Arrays.sort(formats);
}
// NOTE: getMotifWindow() should never be called if the server is
// grabbed. This will lock up the application as it grabs the server
// itself.
// Since we don't grab the server before getMotifWindow(), another
// client might replace motif window after we read it from the root, but
// before we grab the server.
// We cannot resolve this problem, but we believe that this scenario is
// very unlikely to happen.
long motifWindow = getMotifWindow();
XlibWrapper.XGrabServer(XToolkit.getDisplay());
try {
long[][] table = getTargetListTable(motifWindow);
if (table != null) {
for (int i = 0; i < table.length; i++) {
boolean equals = true;
if (table[i].length == formats.length) {
for (int j = 0; j < table[i].length; j++) {
if (table[i][j] != formats[j]) {
equals = false;
break;
}
}
} else {
equals = false;
}
if (equals) {
XlibWrapper.XUngrabServer(XToolkit.getDisplay());
return i;
}
}
} else {
// Create a new table.
// The first two entries must always be the same.
// (see DragBS.c)
table = new long[2][];
table[0] = new long[] { 0 };
table[1] = new long[] { XAtom.XA_STRING };
}
/* Index not found - expand the targets table. */
long[][] new_table = new long[table.length + 1][];
/* Copy the old contents to the new table. */
for (int i = 0; i < table.length; i++) {
new_table[i] = table[i];
}
/* Fill in the new entry */
new_table[new_table.length - 1] = formats;
putTargetListTable(motifWindow, new_table);
return new_table.length - 1;
} finally {
XlibWrapper.XUngrabServer(XToolkit.getDisplay());
}
}
static long[] getTargetListForIndex(int index) {
long motifWindow = getMotifWindow();
long[][] table = getTargetListTable(motifWindow);
if (index < 0 || index >= table.length) {
return new long[0];
} else {
return table[index];
}
}
static byte getByteOrderByte() {
// 'l' - for little endian, 'B' - for big endian.
return ByteOrder.nativeOrder() == ByteOrder.LITTLE_ENDIAN ?
(byte)0x6C : (byte)0x42;
}
static void writeDragInitiatorInfoStruct(long window, int index) throws XException {
assert XToolkit.isAWTLockHeldByCurrentThread();
long structData = unsafe.allocateMemory(MOTIF_INITIATOR_INFO_SIZE);
try {
// BYTE byte_order
unsafe.putByte(structData, getByteOrderByte());
// BYTE protocol_version
unsafe.putByte(structData + 1, MOTIF_DND_PROTOCOL_VERSION);
// CARD16 protocol_version
unsafe.putShort(structData + 2, (short)index);
// CARD32 icc_handle
unsafe.putInt(structData + 4, (int)XA_MOTIF_ATOM_0.getAtom());
XErrorHandlerUtil.WITH_XERROR_HANDLER(XErrorHandler.VerifyChangePropertyHandler.getInstance());
XlibWrapper.XChangeProperty(XToolkit.getDisplay(), window,
XA_MOTIF_ATOM_0.getAtom(),
XA_MOTIF_DRAG_INITIATOR_INFO.getAtom(),
8, XConstants.PropModeReplace,
structData, MOTIF_INITIATOR_INFO_SIZE);
XErrorHandlerUtil.RESTORE_XERROR_HANDLER();
if ((XErrorHandlerUtil.saved_error != null) &&
(XErrorHandlerUtil.saved_error.get_error_code() != XConstants.Success)) {
throw new XException("Cannot write drag initiator info");
}
} finally {
unsafe.freeMemory(structData);
}
}
static void writeDragReceiverInfoStruct(long window) throws XException {
assert XToolkit.isAWTLockHeldByCurrentThread();
int dataSize = MotifDnDConstants.MOTIF_RECEIVER_INFO_SIZE;
long data = unsafe.allocateMemory(dataSize);
try {
unsafe.putByte(data, MotifDnDConstants.getByteOrderByte()); /* byte order */
unsafe.putByte(data + 1, MotifDnDConstants.MOTIF_DND_PROTOCOL_VERSION); /* protocol version */
unsafe.putByte(data + 2, (byte)MotifDnDConstants.MOTIF_DYNAMIC_STYLE); /* protocol style */
unsafe.putByte(data + 3, (byte)0); /* pad */
unsafe.putInt(data + 4, (int)window); /* proxy window */
unsafe.putShort(data + 8, (short)0); /* num_drop_sites */
unsafe.putShort(data + 10, (short)0); /* pad */
unsafe.putInt(data + 12, dataSize);
XErrorHandlerUtil.WITH_XERROR_HANDLER(XErrorHandler.VerifyChangePropertyHandler.getInstance());
XlibWrapper.XChangeProperty(XToolkit.getDisplay(), window,
XA_MOTIF_DRAG_RECEIVER_INFO.getAtom(),
XA_MOTIF_DRAG_RECEIVER_INFO.getAtom(),
8, XConstants.PropModeReplace,
data, dataSize);
XErrorHandlerUtil.RESTORE_XERROR_HANDLER();
if ((XErrorHandlerUtil.saved_error != null) &&
(XErrorHandlerUtil.saved_error.get_error_code() != XConstants.Success)) {
throw new XException("Cannot write Motif receiver info property");
}
} finally {
unsafe.freeMemory(data);
}
}
public static int getMotifActionsForJavaActions(int javaActions) {
int motifActions = MOTIF_DND_NOOP;
if ((javaActions & DnDConstants.ACTION_MOVE) != 0) {
motifActions |= MOTIF_DND_MOVE;
}
if ((javaActions & DnDConstants.ACTION_COPY) != 0) {
motifActions |= MOTIF_DND_COPY;
}
if ((javaActions & DnDConstants.ACTION_LINK) != 0) {
motifActions |= MOTIF_DND_LINK;
}
return motifActions;
}
public static int getJavaActionsForMotifActions(int motifActions) {
int javaActions = DnDConstants.ACTION_NONE;
if ((motifActions & MOTIF_DND_MOVE) != 0) {
javaActions |= DnDConstants.ACTION_MOVE;
}
if ((motifActions & MOTIF_DND_COPY) != 0) {
javaActions |= DnDConstants.ACTION_COPY;
}
if ((motifActions & MOTIF_DND_LINK) != 0) {
javaActions |= DnDConstants.ACTION_LINK;
}
return javaActions;
}
}
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