Multitouch Trackpad Events

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Cower	Created : 08 January 2010 Edited : 08 January 2010 System : Mac Language : Blitz Max Multitouch Trackpad Events Code for handling for mutlitouch trackpad events (magnification, rotation, and swiping) in BlitzMax under Mac OS
What this does is it takes a TGLGraphics instance and inserts a responder into the responder chain for the window or view associated with the graphics, and then passes along events to BlitzMax, which you can get at by polling for events or adding a hook for EmitEventHook. The only important functions are CreateTrackpadHandler and DestroyTrackpadHandler. The event constants are in the source, but only three of them are used, so don't bother checking for the ones marked 'unused.' Example SuperStrict 'buildopt:gui ?MacOS Import "tracktouch.bmx" SetGraphicsDriver(GLMax2DDriver()) ' If you're using Max2D, you'll have to grab the inner TGraphics from the TMax2DGraphics like so: Local gfx:TGraphics = TMax2DGraphics(Graphics(800,600,0))._graphics Local handle:Int = CreateTrackpadHandler(gfx) Local x:Float = GraphicsWidth().5 Local y:Float = GraphicsHeight().5 Local scale:Float = 1.0 Local rotation:Float = 0.0 Local color:Int = 0 Local Running:Int = True ' Some colors to swipe through Local colors:Int[] = [255,255,255, 254,149,50, 85,85,238, 254,34,35, 200,232,7, 241,41,234, .. 144,204,76, 120,148,183, 155,127,79, 242,11,137, 184,69,74, 35,33,86, .. 30,95,104, 106,148,181] While Running Cls While PollEvent() Select CurrentEvent.id ' HANDLE TOUCH EVENTS Case EVENT_TOUCH_MAGNIFY Rem Unfortunately, the only other way I could see a float being included in an event was if I either subclassed TEvent or if I converted the float value to a string. Neither struck me as necessary, so float values are just packed into an integer. EndRem scale = Max(.25, scale * (1.0+Float Ptr(Varptr CurrentEvent.data)[0])) Case EVENT_TOUCH_SWIPE Local dir$ = Null If CurrentEvent.y Then ' down = -1, up = 1 If CurrentEvent.y > 0 Then dir = "up" Else dir = "down" EndIf ElseIf CurrentEvent.x Then ' right = -1, left = 1 If CurrentEvent.x < 0 Then dir = "right" Else dir = "left" EndIf EndIf DebugLog "Swiped "+dir color = (color - CurrentEvent.x) Mod (colors.Length/3) If color < 0 Then color :+ colors.Length/3 Case EVENT_TOUCH_ROTATE ' Same deal as magnification events rotation :- Float Ptr(Varptr CurrentEvent.Data)[0] ' TOUCH EVENTS END HERE Case EVENT_KEYDOWN If CurrentEvent.data = KEY_ESCAPE Then Running = False ElseIf CurrentEvent.data = KEY_SPACE Then ' debugging bit to ensure the handler restores the responder chain on release If handle Then DestroyTrackpadHandler(handle) handle = 0 Else handle = CreateTrackpadHandler(gfx) EndIf EndIf Case EVENT_APPTERMINATE Running = False End Select Wend SetOrigin(x,y) SetColor(colors[color3], colors[color3+1], colors[color3+2]) SetHandle(16,16) SetScale(scale, scale) SetRotation(rotation) DrawRect(0, 0, 32, 32) Flip Wend DestroyTrackpadHandler(handle) EndGraphics ?Not MacOS Notify("Wrong OS, mate") ? --v tracktouch.m (required)* #import <Cocoa/Cocoa.h> #import <brl.mod/blitz.mod/blitz.h> #define EVENT_USEREVENTMASK (-2147483648) enum { EVENT_TOUCH_GESTURE = EVENT_USEREVENTMASK+88, EVENT_TOUCH_MAGNIFY, EVENT_TOUCH_SWIPE, EVENT_TOUCH_ROTATE, EVENT_TOUCH_BEGINGESTURE, EVENT_TOUCH_ENDGESTURE }; extern BBClass brl_event_TEvent; typedef struct s_bbevent { BBClass clas; int refs; int id; BBObject source; int data; int mods; int x; int y; BBObject extra; } bbevent_t; extern int _brl_event_TEvent_Emit(bbevent_t); // TEvent#Emit #pragma mark - / The NSResponder subclass we'll use to intercept touch events / @interface CTrackpadHandler : NSResponder { struct { // the TGLGraphics structure BBClass clas; int refs; struct { int _[7]; // stuff we're not interested in NSView view; // a view, I'm guessing this is mainly for MaxGUI compatibility id window; // the window (unless view is the one that the graphics are attached to) } ctx; } _graphics; id window; // this is sort of misleading, but this 'window' is either view or window - just a // cached pointer so the two don't need to be checked after initialization } @end #pragma mark - @implementation CTrackpadHandler - (id)initWithGraphics:(BBObject)graphics { if((self = [super init])) { BBRETAIN(graphics); _graphics = graphics; window = _graphics->ctx->view; if (window == nil && (window = _graphics->ctx->window) == nil) { [self release]; return nil; } [self setNextResponder:[window nextResponder]]; [window setNextResponder:self]; } return self; } -(void)removeHandler { if ( _graphics != NULL ) { BBRELEASE(_graphics); _graphics = NULL; [window setNextResponder:[self nextResponder]]; window = nil; } } // redundancy! -(void)finalize { // in the event that the GC is used... [self removeHandler]; [super finalize]; } -(void)dealloc { // regular behavior. [self removeHandler]; [super dealloc]; } /* handle events */ -(void)magnifyWithEvent:(NSEvent)event { int data; (float)&data = [event magnification]; [self emitEventWithID:EVENT_TOUCH_MAGNIFY data:data x:0 y:0]; } -(void)rotateWithEvent:(NSEvent)event { int data; (float)&data = [event rotation]; [self emitEventWithID:EVENT_TOUCH_ROTATE data:data x:0 y:0]; } -(void)swipeWithEvent:(NSEvent)event { [self emitEventWithID:EVENT_TOUCH_SWIPE data:0 x:(int)[event deltaX] y:(int)[event deltaY]]; } -(void)emitEventWithID:(int)id data:(int)data x:(int)x y:(int)y { bbevent_t* bbevent = bbObjectNew(&brl_event_TEvent); bbevent->id = id; BBRETAIN(_graphics); if (bbevent->source != NULL) // I'm not sure by I bothered with this BBRELEASE(bbevent->source); bbevent->source = _graphics; bbevent->data = data; bbevent->x = x; bbevent->y = y; _brl_event_TEvent_Emit(bbevent); } @end #pragma mark - CTrackpadHandler CreateTrackpadHandler(BBObject graphics) { CTrackpadHandler* handler = [[CTrackpadHandler alloc] initWithGraphics:graphics]; return (handler != nil ? handler : NULL); } int DestroyTrackpadHandler(CTrackpadHandler handler) { [handler removeHandler]; [handler release]; return 0; } --v tracktouch.bmx (required)* SuperStrict ?MacOS Import "tracktouch.m" Extern "C" Function CreateTrackpadHandler%(gfx:TGraphics) Function DestroyTrackpadHandler%(handle:Int) End Extern ? Const EVENT_TOUCH_GESTURE:Int = EVENT_USEREVENTMASK+88 ' unused Const EVENT_TOUCH_MAGNIFY:Int = EVENT_TOUCH_GESTURE+1 Const EVENT_TOUCH_SWIPE:Int = EVENT_TOUCH_MAGNIFY+1 Const EVENT_TOUCH_ROTATE:Int = EVENT_TOUCH_SWIPE+1 Const EVENT_TOUCH_BEGINGESTURE:Int = EVENT_TOUCH_ROTATE+1 ' unused Const EVENT_TOUCH_ENDGESTURE:Int = EVENT_TOUCH_BEGINGESTURE+1 ' unused --v

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Multitouch Trackpad Events

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