Java Callback类代码示例

import org.eclipse.swt.internal.Callback; //导入依赖的package包/类
public void init() {
	Callback openDocCallback = new Callback(this, "openDocProc", 3);
	int openDocProc = openDocCallback.getAddress();
	if (openDocProc == 0) {
		openDocCallback.dispose();
		return;
	}
	if (OS.AEInstallEventHandler(kCoreEventClass, kAEOpenDocuments,openDocProc, 0, false) != OS.noErr) {
		return;
	}
	if (OS.AEInstallEventHandler(kURLEventClass, kURLEventClass,openDocProc, 0, false) != OS.noErr) {
		return;
	}
	int appTarget = OS.GetApplicationEventTarget();
	Callback appleEventCallback = new Callback(this, "appleEventProc", 3);
	int appleEventProc = appleEventCallback.getAddress();
	int[] mask3 = new int[] { OS.kEventClassAppleEvent, OS.kEventAppleEvent, kURLEventClass, };
	OS.InstallEventHandler(appTarget, appleEventProc,mask3.length / 2, mask3, 0, null);
}
 

import org.eclipse.swt.internal.Callback; //导入依赖的package包/类
private static ILongPtr getCallbackAddress(Callback callback)
{
    ILongPtr address = WinAPI.ZERO_LONGPTR;
    if (callback != null)
    {
        try
        {
            Class<? extends Callback> clasz = callback.getClass();
            Method m = clasz.getMethod("getAddress");
            address = WinAPI.INSTANCE.createLongPtr(((Number) m.invoke(callback)));
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
    return address;
}
 

import org.eclipse.swt.internal.Callback; //导入依赖的package包/类
public void init() throws Throwable{
	long cls = TGCocoa.objc_lookUpClass ("SWTApplicationDelegate");
	if( cls != 0 ){
		Callback callback = TGCocoa.newCallback( this , "callbackProc64" , "callbackProc32", 4 );
		
		long callbackProc = TGCocoa.getCallbackAddress( callback );
		if( callbackProc != 0 ){
			TGCocoa.class_addMethod(cls, sel_application_openFile_, callbackProc , "B:@@");
		}
	}
}
 

import org.eclipse.swt.internal.Callback; //导入依赖的package包/类
ClipboardProxy(Display display) {
	this.display = display;
	getFunc = new Callback(this, "getFunc", 4); //$NON-NLS-1$
	if (getFunc.getAddress() == 0)
		SWT.error(SWT.ERROR_NO_MORE_CALLBACKS);
	clearFunc = new Callback(this, "clearFunc", 2); //$NON-NLS-1$
	if (clearFunc.getAddress() == 0)
		SWT.error(SWT.ERROR_NO_MORE_CALLBACKS);
}
 

import org.eclipse.swt.internal.Callback; //导入依赖的package包/类
static private Callback newCallback(Object object, String method,
		int argCount) {
	Callback callback = new Callback(object, method, argCount);
	if (callback.getAddress() == 0)
		SWT.error(SWT.ERROR_NO_MORE_CALLBACKS);
	return callback;
}
 

import org.eclipse.swt.internal.Callback; //导入依赖的package包/类
public static final Callback newCallback(Object object, String method64, String method32, int argCount) throws Throwable {
	return new Callback( object, ( C.PTR_SIZEOF == 8 ? method64 : method32 ) , argCount );
}
 

import org.eclipse.swt.internal.Callback; //导入依赖的package包/类
public static final long getCallbackAddress( Callback callback ) throws Throwable {
	return longValue(invokeMethod(Callback.class, callback , "getAddress", new Object[] {}));
}
 

import org.eclipse.swt.internal.Callback; //导入依赖的package包/类
public void init( Shell shell ) throws Throwable{
	Callback callback = TGCocoa.newCallback( this , "callbackProc64", "callbackProc32", 3 );
	long callbackProc = TGCocoa.getCallbackAddress( callback );
	
	if( callbackProc != 0 ){
		String classname = ("MacToolbarDelegate");
		if( TGCocoa.objc_lookUpClass ( classname ) == 0 ) {
			long cls = TGCocoa.objc_allocateClassPair( classname , 0 ) ;
			TGCocoa.class_addIvar(cls, SWT_OBJECT, C.PTR_SIZEOF , (byte)(C.PTR_SIZEOF == 4 ? 2 : 3), new byte[]{'*','\0'} );
			TGCocoa.class_addMethod(cls, sel_toolbarButtonClicked_, callbackProc , "@:@");
			TGCocoa.objc_registerClassPair(cls);
		}
		
		this.delegate = TGCocoa.newMacToolbarDelegate();
		this.delegate.alloc().init();
		this.delegateRef = TGCocoa.NewGlobalRef( MacToolbar.this );
		
		TGCocoa.object_setInstanceVariable( MacToolbarDelegate.class.getField("id").get( delegate ) , SWT_OBJECT , this.delegateRef );
		
		NSToolbar dummyBar = new NSToolbar();
		dummyBar.alloc();
		dummyBar.initWithIdentifier(NSString.stringWith("SWTToolbar")); //$NON-NLS-1$
		dummyBar.setVisible(false);
		
		NSWindow nsWindow = shell.view.window();
		nsWindow.setToolbar(dummyBar);
		dummyBar.release();
		nsWindow.setShowsToolbarButton(true);
		
		NSButton toolbarButton = TGCocoa.getStandardWindowButton(nsWindow, NSWindowToolbarButton);
		if (toolbarButton != null) {
			toolbarButton.setTarget( delegate );
			TGCocoa.setControlAction( toolbarButton , sel_toolbarButtonClicked_ );
		}
	}
}
 

import org.eclipse.swt.internal.Callback; //导入依赖的package包/类
private void initialize(final CallbackObject callbackObject) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, ClassNotFoundException {
	final Class<?> osCls = Class.forName("org.eclipse.swt.internal.cocoa.OS");

	// Register names in Objective-C.
	if (sel_toolbarButtonClicked_ == 0) {
		sel_preferencesMenuItemSelected_ = registerName(osCls, "preferencesMenuItemSelected:");
		sel_aboutMenuItemSelected_ = registerName(osCls, "aboutMenuItemSelected:");
	}

	// Create an SWT Callback object that will invoke the actionProc method of our internal callbackObject.
	proc3Args = new Callback(callbackObject, "actionProc", 3);
	final long proc3 = proc3Args.getAddress();
	if (proc3 == 0) {
		SWT.error(SWT.ERROR_NO_MORE_CALLBACKS);
	}

	final Object object = invoke(osCls, "objc_lookUpClass", new Object[] { "SWTApplicationDelegate" });
	final long cls = convertToLong(object);

	// Add the action callbacks for Preferences and About menu items.
	invoke(osCls, "class_addMethod", new Object[] { wrapPointer(cls), wrapPointer(sel_preferencesMenuItemSelected_), wrapPointer(proc3), "@:@" });
	invoke(osCls, "class_addMethod", new Object[] { wrapPointer(cls), wrapPointer(sel_aboutMenuItemSelected_), wrapPointer(proc3), "@:@" });

	final Class<?> nsapplicationCls = Class.forName("org.eclipse.swt.internal.cocoa.NSApplication");
	final Class<?> nsmenuCls = Class.forName("org.eclipse.swt.internal.cocoa.NSMenu");

	// Get the Mac OS X Application menu.
	final Object sharedApplication = invoke(nsapplicationCls, "sharedApplication");
	final Object mainMenu = invoke(sharedApplication, "mainMenu");
	final Object mainMenuItem = invoke(nsmenuCls, mainMenu, ITEM_AT_INDEX, new Number[] { wrapPointer(0) });
	final Object appMenu = invoke(mainMenuItem, "submenu");

	final Object aboutMenuItem = invoke(nsmenuCls, appMenu, ITEM_AT_INDEX, new Number[] { wrapPointer(kAboutMenuItem) });
	final Object prefMenuItem = invoke(nsmenuCls, appMenu, ITEM_AT_INDEX, new Number[] { wrapPointer(kPreferencesMenuItem) });

	final Class<?> nsmenuitemCls = Class.forName("org.eclipse.swt.internal.cocoa.NSMenuItem");

	if (callbackObject.aboutEnabled) {
		invoke(nsmenuitemCls, aboutMenuItem, "setAction", new Number[] { wrapPointer(sel_aboutMenuItemSelected_) });
	}
	invoke(nsmenuitemCls, aboutMenuItem, "setEnabled", new Boolean[] { callbackObject.aboutEnabled });

	if (callbackObject.preferencesEnabled) {
		invoke(nsmenuitemCls, prefMenuItem, "setAction", new Number[] { wrapPointer(sel_preferencesMenuItemSelected_) });
	}
	invoke(nsmenuitemCls, prefMenuItem, "setEnabled", new Boolean[] { callbackObject.preferencesEnabled });
}