diff --git a/ui/gestures/gestures.android.ts b/ui/gestures/gestures.android.ts index 29c2ffb23..b5db883ee 100644 --- a/ui/gestures/gestures.android.ts +++ b/ui/gestures/gestures.android.ts @@ -468,7 +468,7 @@ class CustomPanGestureDetector { } private trackStart(currentEvent: android.view.MotionEvent) { - let inital = this.getMotionEventCenter(this.lastEventCache ? this.lastEventCache : currentEvent); + let inital = this.getEventCoordinates(this.lastEventCache ? this.lastEventCache : currentEvent); this.initialX = inital.x; this.initialY = inital.y; this.isTracking = true; @@ -478,7 +478,7 @@ class CustomPanGestureDetector { } private trackChange(currentEvent: android.view.MotionEvent) { - let current = this.getMotionEventCenter(currentEvent); + let current = this.getEventCoordinates(currentEvent); this.deltaX = current.x - this.initialX; this.deltaY = current.y - this.initialY; @@ -486,18 +486,28 @@ class CustomPanGestureDetector { _executeCallback(this.observer, args); } - private getMotionEventCenter(event: android.view.MotionEvent): { x: number, y: number } { - let count = event.getPointerCount(); - let res = { x: 0, y: 0 }; - for (let i = 0; i < count; i++) { - res.x += event.getRawX(); - res.y += event.getRawY(); + private getEventCoordinates(event: android.view.MotionEvent): { x: number, y: number } { + var count = event.getPointerCount(); + if (count === 1) { + return { + x: event.getRawX() / this.density, + y: event.getRawY() / this.density + }; } + else { + var res = { x: 0, y: 0 }; + var offX = event.getRawX() - event.getX(); + var offY = event.getRawY() - event.getY(); - res.x /= (count * this.density); - res.y /= (count * this.density); + for (var i = 0; i < count; i++) { + res.x += event.getX(i) + offX; + res.y += event.getY(i) + offY; + } - return res; + res.x /= (count * this.density); + res.y /= (count * this.density); + return res; + } } }