/*
* @(#)Cursor.java 1.40 03/12/19
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.awt;
import java.awt.AWTException;
import java.awt.Point;
import java.awt.Toolkit;
import java.io.File;
import java.io.FileInputStream;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Properties;
import java.util.StringTokenizer;
import java.security.AccessController;
import sun.awt.DebugHelper;
/**
* A class to encapsulate the bitmap representation of the mouse cursor.
*
* @see Component#setCursor
* @version 1.40, 12/19/03
* @author Amy Fowler
*/
public class Cursor implements java.io.Serializable {
/**
* The default cursor type (gets set if no cursor is defined).
*/
public static final int DEFAULT_CURSOR = 0;
/**
* The crosshair cursor type.
*/
public static final int CROSSHAIR_CURSOR = 1;
/**
* The text cursor type.
*/
public static final int TEXT_CURSOR = 2;
/**
* The wait cursor type.
*/
public static final int WAIT_CURSOR = 3;
/**
* The south-west-resize cursor type.
*/
public static final int SW_RESIZE_CURSOR = 4;
/**
* The south-east-resize cursor type.
*/
public static final int SE_RESIZE_CURSOR = 5;
/**
* The north-west-resize cursor type.
*/
public static final int NW_RESIZE_CURSOR = 6;
/**
* The north-east-resize cursor type.
*/
public static final int NE_RESIZE_CURSOR = 7;
/**
* The north-resize cursor type.
*/
public static final int N_RESIZE_CURSOR = 8;
/**
* The south-resize cursor type.
*/
public static final int S_RESIZE_CURSOR = 9;
/**
* The west-resize cursor type.
*/
public static final int W_RESIZE_CURSOR = 10;
/**
* The east-resize cursor type.
*/
public static final int E_RESIZE_CURSOR = 11;
/**
* The hand cursor type.
*/
public static final int HAND_CURSOR = 12;
/**
* The move cursor type.
*/
public static final int MOVE_CURSOR = 13;
protected static Cursor predefined[] = new Cursor[14];
/* Localization names and default values */
static final String[][] cursorProperties = {
{ "AWT.DefaultCursor", "Default Cursor" },
{ "AWT.CrosshairCursor", "Crosshair Cursor" },
{ "AWT.TextCursor", "Text Cursor" },
{ "AWT.WaitCursor", "Wait Cursor" },
{ "AWT.SWResizeCursor", "Southwest Resize Cursor" },
{ "AWT.SEResizeCursor", "Southeast Resize Cursor" },
{ "AWT.NWResizeCursor", "Northwest Resize Cursor" },
{ "AWT.NEResizeCursor", "Northeast Resize Cursor" },
{ "AWT.NResizeCursor", "North Resize Cursor" },
{ "AWT.SResizeCursor", "South Resize Cursor" },
{ "AWT.WResizeCursor", "West Resize Cursor" },
{ "AWT.EResizeCursor", "East Resize Cursor" },
{ "AWT.HandCursor", "Hand Cursor" },
{ "AWT.MoveCursor", "Move Cursor" },
};
/**
* The chosen cursor type initially set to
* the <code>DEFAULT_CURSOR</code>.
*
* @serial
* @see #getType()
*/
int type = DEFAULT_CURSOR;
/**
* The type associated with all custom cursors.
*/
public static final int CUSTOM_CURSOR = -1;
/*
* hashtable, filesystem dir prefix, filename, and properties for custom cursors support
*/
private static final Hashtable systemCustomCursors = new Hashtable(1);
private static final String systemCustomCursorDirPrefix = initCursorDir();
private static String initCursorDir() {
String jhome = (String) java.security.AccessController.doPrivileged(
new sun.security.action.GetPropertyAction("java.home"));
return jhome +
File.separator + "lib" + File.separator + "images" +
File.separator + "cursors" + File.separator;
}
private static final String systemCustomCursorPropertiesFile = systemCustomCursorDirPrefix + "cursors.properties";
private static Properties systemCustomCursorProperties = null;
private static final String CursorDotPrefix = "Cursor.";
private static final String DotFileSuffix = ".File";
private static final String DotHotspotSuffix = ".HotSpot";
private static final String DotNameSuffix = ".Name";
/*
* JDK 1.1 serialVersionUID
*/
private static final long serialVersionUID = 8028237497568985504L;
private static final DebugHelper dbg = DebugHelper.create(Cursor.class);
static {
/* ensure that the necessary native libraries are loaded */
Toolkit.loadLibraries();
if (!GraphicsEnvironment.isHeadless()) {
initIDs();
}
}
/**
* Initialize JNI field and method IDs for fields that may be
* accessed from C.
*/
private static native void initIDs();
/**
* Hook into native data.
*/
private transient long pData;
/**
* The user-visible name of the cursor.
*
* @serial
* @see #getName()
*/
protected String name;
/**
* Returns a cursor object with the specified predefined type.
*
* @param type the type of predefined cursor
* @return the specified predefined cursor
* @throws IllegalArgumentException if the specified cursor type is
* invalid
*/
static public Cursor getPredefinedCursor(int type) {
if (type < Cursor.DEFAULT_CURSOR || type > Cursor.MOVE_CURSOR) {
throw new IllegalArgumentException("illegal cursor type");
}
if (predefined[type] == null) {
predefined[type] = new Cursor(type);
}
return predefined[type];
}
/**
* Returns a system-specific custom cursor object matching the
* specified name. Cursor names are, for example: "Invalid.16x16"
*
* @param name a string describing the desired system-specific custom cursor
* @return the system specific custom cursor named
* @exception HeadlessException if
* <code>GraphicsEnvironment.isHeadless</code> returns true
*/
static public Cursor getSystemCustomCursor(final String name)
throws AWTException, HeadlessException {
GraphicsEnvironment.checkHeadless();
Cursor cursor = (Cursor)systemCustomCursors.get(name);
if (cursor == null) {
synchronized(systemCustomCursors) {
if (systemCustomCursorProperties == null)
loadSystemCustomCursorProperties();
}
String prefix = CursorDotPrefix + name;
String key = prefix + DotFileSuffix;
if (!systemCustomCursorProperties.containsKey(key)) {
if (dbg.on) {
dbg.println("Cursor.getSystemCustomCursor(" + name + ") returned null");
}
return null;
}
final String fileName =
systemCustomCursorProperties.getProperty(key);
String localized = (String)systemCustomCursorProperties.getProperty(prefix + DotNameSuffix);
if (localized == null) localized = name;
String hotspot = (String)systemCustomCursorProperties.getProperty(prefix + DotHotspotSuffix);
if (hotspot == null)
throw new AWTException("no hotspot property defined for cursor: " + name);
StringTokenizer st = new StringTokenizer(hotspot, ",");
if (st.countTokens() != 2)
throw new AWTException("failed to parse hotspot property for cursor: " + name);
int x = 0;
int y = 0;
try {
x = Integer.parseInt(st.nextToken());
y = Integer.parseInt(st.nextToken());
} catch (NumberFormatException nfe) {
throw new AWTException("failed to parse hotspot property for cursor: " + name);
}
try {
final int fx = x;
final int fy = y;
final String flocalized = localized;
cursor = (Cursor) java.security.AccessController.doPrivileged(
new java.security.PrivilegedExceptionAction() {
public Object run() throws Exception {
Toolkit toolkit = Toolkit.getDefaultToolkit();
Image image = toolkit.getImage(
systemCustomCursorDirPrefix + fileName);
return toolkit.createCustomCursor(
image, new Point(fx,fy), flocalized);
}
});
} catch (Exception e) {
throw new AWTException(
"Exception: " + e.getClass() + " " + e.getMessage() +
" occurred while creating cursor " + name);
}
if (cursor == null) {
if (dbg.on) {
dbg.println("Cursor.getSystemCustomCursor(" + name + ") returned null");
}
} else {
systemCustomCursors.put(name, cursor);
}
}
return cursor;
}
/**
* Return the system default cursor.
*/
static public Cursor getDefaultCursor() {
return getPredefinedCursor(Cursor.DEFAULT_CURSOR);
}
/**
* Creates a new cursor object with the specified type.
* @param type the type of cursor
* @throws IllegalArgumentException if the specified cursor type
* is invalid
*/
public Cursor(int type) {
if (type < Cursor.DEFAULT_CURSOR || type > Cursor.MOVE_CURSOR) {
throw new IllegalArgumentException("illegal cursor type");
}
this.type = type;
// Lookup localized name.
name = Toolkit.getProperty(cursorProperties[type][0],
cursorProperties[type][1]);
}
/**
* Creates a new custom cursor object with the specified name.<p>
* Note: this constructor should only be used by AWT implementations
* as part of their support for custom cursors. Applications should
* use Toolkit.createCustomCursor().
* @param name the user-visible name of the cursor.
* @see java.awt.Toolkit#createCustomCursor
*/
protected Cursor(String name) {
this.type = Cursor.CUSTOM_CURSOR;
this.name = name;
}
/**
* Returns the type for this cursor.
*/
public int getType() {
return type;
}
/**
* Returns the name of this cursor.
* @return a localized description of this cursor.
* @since 1.2
*/
public String getName() {
return name;
}
/**
* Returns a string representation of this cursor.
* @return a string representation of this cursor.
* @since 1.2
*/
public String toString() {
return getClass().getName() + "[" + getName() + "]";
}
/*
* load the cursor.properties file
*/
private static void loadSystemCustomCursorProperties() throws AWTException {
synchronized(systemCustomCursors) {
systemCustomCursorProperties = new Properties();
try {
AccessController.doPrivileged(
new java.security.PrivilegedExceptionAction() {
public Object run() throws Exception {
FileInputStream fis = null;
try {
fis = new FileInputStream(
systemCustomCursorPropertiesFile);
systemCustomCursorProperties.load(fis);
} finally {
if (fis != null)
fis.close();
}
return null;
}
});
} catch (Exception e) {
systemCustomCursorProperties = null;
throw new AWTException("Exception: " + e.getClass() + " " +
e.getMessage() + " occurred while loading: " +
systemCustomCursorPropertiesFile);
}
}
}
// This won't really throw an exception, but it must match the
// signature of Object.finalize
protected void finalize() throws Throwable {
if (!GraphicsEnvironment.isHeadless()) {
finalizeImpl();
}
}
private native void finalizeImpl() throws Throwable;
}
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