Detect multiple multi-touch gestures such as zoom and rotation with fling.

Features

• single click
• double click
• long click
• smooth zoom
• smooth rotation
• smooth 2D-scrolling

Scale/Zoom	Rotation	Move/Translate

Usage

class MyView(context: Context): View(context) {
  private val mTouchGestureDetector: TouchGestureDetector = TouchGestureDetector(context, object : TouchGestureDetector.Listener {
    override fun onEnd() {}
    override fun onDoubleClick(x: Float, y: Float) {}
    override fun onClick(detector: TouchGestureDetector, x: Float, y: Float) {}
    override fun onLongClick(x: Float, y: Float) {}
    override fun onMove(detector: TouchGestureDetector, deltaX: Float, deltaY: Float) {}
    override fun onScale(detector: TouchGestureDetector, focusX: Float, focusY: Float, scaleFactor: Float) {}
    override fun onRotate(focusX: Float, focusY: Float, angle: Float) {}
  })

  override fun onTouchEvent(event: MotionEvent): Boolean {
    val ret: Boolean = mTouchGestureDetector.onTouchEvent(event)

    if (ret)
     invalidate()

    return ret
  }

  override fun computeScroll() {
    if (mTouchGestureDetector.computeScroll()) {
      ViewCompat.postInvalidateOnAnimation(this)
    }
  }
}