Re: [pde-dev] Getting Tablet Events (in OS X)

[Chris Aniszczyk <zx@xxxxxxxxxxxxxxxxx>]

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On Sat, Feb 21, 2009 at 3:33 PM, Sciss <contact@xxxxxxxx> wrote:

hello,

i'm new to the list. i have a problem: i have using jerry huxtable's JNITablet ( http://www.jhlabs.com/java/tablet/ ) successfully for a long time now. i am now writing an Eclipse application in Scala, using my Java libraries. the code in JNITablet doesn't work any more because as it seems there is a stupidity that only one instance of NSApplication can exist and that has a non-plugable method sendEvent that is for mouse and tablet event notifications.

the approach of JNITablet is a follows: via JNI a call to startup is made which instantiates a fake-subclass of NSApplication, using some method named poseAsClass:

JNIEXPORT void JNICALL Java_com_jhlabs_jnitablet_TabletWrapper_startup(JNIEnv *env, jobject this) {
   [CustomApplication poseAsClass: [NSApplication class]];
   g_object = (*env)->NewGlobalRef( env, this );
   g_class = (*env)->GetObjectClass( env, this );
   g_class = (*env)->NewGlobalRef( env, g_class );
   if( g_class != (jclass) 0 ) {
       g_postMethodID                  = (*env)->GetMethodID( env, g_class, "postEvent", "(IIFFIIIIIFFFFFSSS)V" );
       g_postProximityMethodID = (*env)->GetMethodID( env, g_class, "postProximityEvent", "(IIZIIIIIIII)V" );
       } else {
               NSLog(@"JNITablet: Couldn't register java methods");
       }
}

this CustomApplication is as follows

@interface CustomApplication : NSApplication
@end

@implementation CustomApplication
- (void) sendEvent:(NSEvent *)event
{
   JNIEnv *env;
   bool shouldDetach = false;
       int clickCount = -1;

   switch ( [event type] ) {
   case NSLeftMouseDown:
   case NSLeftMouseUp:
               clickCount = [event clickCount];
       case NSMouseMoved:
   case NSLeftMouseDragged:
   case NSTabletPoint:
               // ...
               // ... here's the code that calls back into the Java VM
               // ...
       }
   [super sendEvent: event];
}
@end

as it turns out, now that my java code is running inside an eclipse application, CustomApplication's sendEvent is not called any more, hence i don't receive the tablet events. second problem is, i'm a java developer with barely any knowledge of: ObjectiveC, Cocoa, .... (and unfortunately, also SWT, as all my code is in Swing, using the SWT-to-Swing bridge)

so.... any hints are welcome as how i an reestablish my tablet event delivery...

thanks a lot!

ciao, -sciss-

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Chris Aniszczyk | EclipseSource Austin | +1 860 839 2465
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