public Fling(ScaleImageView view, int velocityX, int velocityY)
{
try
{
_view = view;
view.SetState(TouchState.Fling);
_scroller = new Scroller(view._context);
view._matrix.GetValues(view._m);
var startX = (int)view._m[Matrix.MtransX];
var startY = (int)view._m[Matrix.MtransY];
int minX, maxX, minY, maxY;
if (view.GetImageWidth() > view.ViewWidth)
{
minX = view.ViewWidth - (int)view.GetImageWidth();
maxX = 0;
}
else
{
minX = maxX = startX;
}
if (view.GetImageHeight() > view.ViewHeight)
{
minY = view.ViewHeight - (int)view.GetImageHeight();
maxY = 0;
}
else
{
minY = maxY = startY;
}
_scroller.Fling(startX, startY, velocityX, velocityY, minX, maxX, minY, maxY);
_currX = startX;
_currY = startY;
}
catch (System.Exception ex)
{
AppSettings.Logger.Warning(ex);
}
}
public bool OnTouch(View v, MotionEvent evt)
{
_view._touchListener?.OnTouch(v, evt); // User-defined handler, maybe
_view._scaleDetector?.OnTouchEvent(evt);
_view._gestureDetector?.OnTouchEvent(evt);
var currentX = evt.GetX();
var currentY = evt.GetY();
if (_view._state == TouchState.None || _view._state == TouchState.Drag || _view._state == TouchState.Fling)
{
switch (evt.Action)
{
case MotionEventActions.Down:
_lastX = currentX;
_lastY = currentY;
_view._fling?.CancelFling();
_view.SetState(TouchState.Drag);
break;
case MotionEventActions.Move:
if (_view._state == TouchState.Drag)
{
var deltaX = currentX - _lastX;
var deltaY = currentY - _lastY;
var fixTransX = _view.GetFixDragTrans(deltaX, _view.ViewWidth, _view.GetImageWidth());
var fixTransY = _view.GetFixDragTrans(deltaY, _view.ViewHeight, _view.GetImageHeight());
_view._matrix.PostTranslate(fixTransX, fixTransY);
_view.FixTrans();
_lastX = currentX;
_lastY = currentY;
}
break;
case MotionEventActions.Up:
case MotionEventActions.PointerUp:
_view.SetState(TouchState.None);
break;
}
}
_view.ImageMatrix = _view._matrix;
//
// indicate event was handled
//
return(true);
}