osx - Mouse events and switch -

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i'm very new cocoa , i'm looking way execute applescript when mouse dragged, @ global level. need app running time , has no interface really, running in background , intercept mouse event in conditions.

so far, bit of code can close want applescript executed countless times instead of once.

- (void)applicationdidfinishlaunching:(nsnotification *)anotification {     [nsevent addglobalmonitorforeventsmatchingmask:nsleftmousedraggedmask handler:^(nsevent *event) {       if (nsleftmousedragged) //with more conditions          nsapplescript *run = [[nsapplescript alloc] initwithsource:@"myscripthere"];          [run executeandreturnerror:nil];          }      ]; }


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