toolkit.java

kaffe是一个java虚拟机的源代码。里面包含了一些java例程和标准的java包。

package java.awt;

import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.Transferable;
import java.awt.event.InputEvent;
import java.awt.image.ColorModel;
import java.awt.image.ImageObserver;
import java.awt.image.ImageProducer;
import java.awt.peer.ComponentPeer;
import java.awt.peer.LightweightPeer;
import java.awt.peer.WindowPeer;
import java.io.File;
import java.io.PrintStream;
import java.net.URL;
import java.util.Properties;
import kaffe.util.Ptr;
import kaffe.util.log.LogClient;
import kaffe.util.log.LogStream;

/**
 * Toolkit - used to be an abstract factory for peers, but since we don't have
 * peers, it is just a simple anchor for central mechanisms (like System-
 * EventQueue etc.) and a wrapper for all native methods. Of course, it is a
 * singleton.
 *
 * Copyright (c) 1998
 *      Transvirtual Technologies, Inc.  All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution 
 * of this file. 
 *
 * @author P.C.Mehlitz
 */
class FlushThread
  extends Thread
{
	boolean stop;
	int flushInterval;

FlushThread ( int interval ) {
	super( "AWT-Flusher");
	
	flushInterval = interval;
	setPriority( Thread.MIN_PRIORITY + 1);
}

public void run () {
	while ( !stop ) {
		Toolkit.tlkFlush();
		try {
			Thread.sleep( flushInterval);
		}
		catch ( Exception x ) {}
	}
}

void stopFlushing () {
	stop = true;
}
}

class NativeCollector
  extends Thread
{
NativeCollector () {
	super( "AWT-native");
}

public void run () {
	// this does not return until the we shut down the system, since it
	// consititutes the native dispatcher loop. Don't be confused about
	// tlkInit being a sync method. It gives up the lock in the native
	// layer before falling into its dispatcher loop

	try {
		if ( !Toolkit.tlkInit( System.getProperty( "awt.display")) ) {
			throw new AWTError( "native layer init failed");
		}
	} catch ( Throwable x ) {
		x.printStackTrace();
	}
}
}

public class Toolkit
{
	static Toolkit singleton;
	static Dimension screenSize;
	static int resolution;
	static EventQueue eventQueue;
	static EventDispatchThread eventThread;
	static NativeClipboard clipboard;
	static ColorModel colorModel;
	static LightweightPeer lightweightPeer = new LightweightPeer() {};
	static WindowPeer windowPeer = new WindowPeer() {};
	static FlushThread flushThread;
	static NativeCollector collectorThread;
	static int flags;
	final static int FAILED = -1;
	final static int IS_BLOCKING = 1;
	final static int IS_DISPATCH_EXCLUSIVE = 2;
	final static int NEEDS_FLUSH = 4;
	final static int NATIVE_DISPATCHER_LOOP = 8;
	final static int EXTERNAL_DECO = 16;

static {
	System.loadLibrary( "awt");
	flags = tlkProperties();

	if ( (flags & NATIVE_DISPATCHER_LOOP) == 0 ) {
		if ( !tlkInit( System.getProperty( "awt.display")) ) {
			throw new AWTError( "native layer initialization failed");
		}
		initToolkit();
	}
	else {
		// Not much we can do here, we have to delegate the native init
		// to a own thread since tlkInit() doesn't return. Wait for this
		// thread to flag that initialization has been completed
		collectorThread = new NativeCollector();
		collectorThread.start();

		try {
			synchronized ( Toolkit.class ) {
				while ( singleton == null )
					Toolkit.class.wait();
			}
		}
		catch ( Exception x ) {
			x.printStackTrace();
		}
	}
}

Toolkit () {
}

public void beep () {
	tlkBeep();
}

native static synchronized void cbdFreeClipboard ( Ptr cbdData );

native static synchronized Transferable cbdGetContents( Ptr cbdData);

native static synchronized Ptr cbdInitClipboard ();

native static synchronized boolean cbdSetOwner ( Ptr cbdData );

public int checkImage(Image image, int width, int height, ImageObserver observer) {
	return (image.checkImage( width, height, observer, false));
}

native static synchronized long clrBright ( int rgbValue );

native static synchronized long clrDark ( int rgbValue );

native static synchronized ColorModel clrGetColorModel();

native static synchronized int clrGetPixelValue ( int rgb );

native static synchronized int clrSetSystemColors ( int[] sysClrs );

public Image createImage ( ImageProducer producer ) {
	return new Image( producer);
}

public Image createImage ( byte[] imageData ) {
	return createImage( imageData, 0, imageData.length);
}

public Image createImage ( byte[] imagedata, int imageoffset, int imagelength ) {
	return new Image( imagedata, imageoffset, imagelength);
}

ComponentPeer createLightweight ( Component c ) {
	// WARNING! this is just a dummy to enable checks like
	// "..getPeer() != null.. or ..peer instanceof LightweightPeer..
  // see createWindow()
	return lightweightPeer;
}

static void createNative ( Component c ) {
	WMEvent e = null;

	synchronized ( Toolkit.class ) {
		// even if this could be done in a central location, we defer this
		// as much as possible because it might involve polling (for non-threaded
		// AWTs), slowing down the startup time
		if ( eventThread == null ) {
			startDispatch();
		}
	}

	// do we need some kind of a context switch ?
	if ( (flags & IS_DISPATCH_EXCLUSIVE) != 0 ){
		if ( (flags & NATIVE_DISPATCHER_LOOP) != 0 ){
			if ( Thread.currentThread() != collectorThread ){
				// this is beyond our capabilities (there is no Java message entry we can call
				// in the native collector), we have to revert to some native mechanism
				e =  WMEvent.getEvent( c, WMEvent.WM_CREATE);
				evtSendWMEvent( e);
			}
		}
		else {
			if ( Thread.currentThread() != eventThread ){
				// we can force the context switch by ourselves, no need to go native
				e =  WMEvent.getEvent( c, WMEvent.WM_CREATE);
				eventQueue.postEvent( e);
			}
		}
			
		// Ok, we have a request out there, wait for it to be served
		if ( e != null ) {
			// we should check for nativeData because the event might
			// already be processed (depending on the thread system)
			while ( c.getNativeData() == null ) {
				synchronized ( e ) {
					try { e.wait(); } catch ( InterruptedException x ) {}
				} 
			}
				
			return;
		}
	}
	else {
		// no need to switch threads, go native right away
		c.createNative();
	}
}

protected WindowPeer createWindow ( Window w ) {
	// WARNING! this is just a dummy to enable checks like
	// "..getPeer() != null.. or ..peer instanceof LightweightPeer..
	// it is NOT a real peer support. The peer field just exists to
	// check if a Component already passed its addNotify()/removeNotify().
	// This most probably will be removed once the "isLightweightComponent()"
	// method gets official (1.2?)

	return windowPeer;
}

static void destroyNative ( Component c ) {
	WMEvent e = null;

	// do we need some kind of a context switch ?
	if ( (flags & IS_DISPATCH_EXCLUSIVE) != 0 ){
		if ( (flags & NATIVE_DISPATCHER_LOOP) != 0 ){
			if ( Thread.currentThread() != collectorThread ){
				// this is beyond our capabilities (there is no Java message entry we can call
				// in the native collector), we have to revert to some native mechanism
				e =  WMEvent.getEvent( c, WMEvent.WM_DESTROY);
				evtSendWMEvent( e);
			}
		}
		else {
			if ( Thread.currentThread() != eventThread ){
				// we can force the context switch by ourselves, no need to go native
				e =  WMEvent.getEvent( c, WMEvent.WM_DESTROY);
				eventQueue.postEvent( e);
			}
		}
			
		// Ok, we have a request out there, wait for it to be served
		if ( e != null ) {
			// we should check for nativeData because the event might
			// already be processed (depending on the thread system)
			while ( c.getNativeData() != null ) {
				synchronized ( e ) {
					try { e.wait(); } catch ( InterruptedException x ) {}
				} 
			}
				
			return;
		}
	}
	else {
		// no need to switch threads, go native right away
		c.destroyNative();
	}
}

native static synchronized AWTEvent evtGetNextEvent ();

native static synchronized Component[] evtInit ();

native static synchronized AWTEvent evtPeekEvent ();

native static synchronized AWTEvent evtPeekEventId ( int eventId );

native static synchronized int evtRegisterSource ( Ptr wndData );

native static synchronized void evtSendWMEvent ( WMEvent e );

native static synchronized int evtUnregisterSource ( Ptr wndData );

native static synchronized void evtWakeup ();

native static synchronized int fntBytesWidth ( Ptr fmData, byte[] data, int off, int len );

native static synchronized int fntCharWidth ( Ptr fmData, char c );

native static synchronized int fntCharsWidth ( Ptr fmData, char[] data, int off, int len );

native static synchronized void fntFreeFont ( Ptr fontData );

native static synchronized void fntFreeFontMetrics ( Ptr fmData );

native static synchronized int fntGetAscent ( Ptr fmData);

native static synchronized int fntGetDescent ( Ptr fmData);

native static synchronized int fntGetFixedWidth ( Ptr fmData);

native static synchronized int fntGetHeight ( Ptr fmData);

native static synchronized int fntGetLeading ( Ptr fmData);

native static synchronized int fntGetMaxAdvance ( Ptr fmData);

native static synchronized int fntGetMaxAscent ( Ptr fmData);

native static synchronized int fntGetMaxDescent ( Ptr fmData);

native static synchronized int[] fntGetWidths ( Ptr fmData );

native static synchronized Ptr fntInitFont ( String fntSpec, int style, int size );

native static synchronized Ptr fntInitFontMetrics ( Ptr fontData);

native static synchronized boolean fntIsWideFont ( Ptr fmData);

native static synchronized int fntStringWidth ( Ptr fmData, String s );