public void OnGesture(Gesture gesture)
{
switch (gesture.GestureType)
{
case GestureType.MouseWheel:
if (_view.IsPointInsideView(gesture.Position))
{
float offset = -gesture.Offset.Y * _wheelSpeed;
if (_wheelScrollsHorizontal)
{
float maxScroll = _service.ScrolledElement.MaxScrollX - _service.ScrolledElement.ScreenBounds.Width;
if ((offset < 0 && _service.ScrollPositionX > 0) || (offset > 0 && _service.ScrollPositionX < maxScroll))
{
_service.ScrollPositionX += offset;
}
}
else
{
float maxScroll = _service.ScrolledElement.MaxScrollY - _service.ScrolledElement.ScreenBounds.Height;
if ((offset < 0 && _service.ScrollPositionY > 0) || (offset > 0 && _service.ScrollPositionY < maxScroll))
{
_service.ScrollPositionY += offset;
}
}
}
break;
case GestureType.Up:
if (_touchIdX == gesture.TouchId)
{
_touchIdX = 0;
_lastMoveTime = null;
_service.ScrollSpeedX = _scrollSpeed.X;
}
if (_touchIdY == gesture.TouchId)
{
_touchIdY = 0;
_lastMoveTime = null;
_service.ScrollSpeedY = _scrollSpeed.Y;
}
break;
case GestureType.HorizontalDrag:
case GestureType.VerticalDrag:
case GestureType.FreeDrag:
if (gesture.PointerCapturedBy == null)
{
if (_touchIdX == 0 && _touchIdY == 0)
{
if (_view.IsPointInsideView(gesture.Origin))
{
_touchIdX = _touchIdY = gesture.TouchId;
gesture.CapturePointer(_view);
}
}
}
if (_touchIdX == gesture.TouchId || _touchIdY == gesture.TouchId)
{
gesture.SetHandled();
if (_touchIdX != 0 && _mode.HasFlag(Mode.HorizontalDrag))
{
_service.ScrollPositionX -= gesture.Offset.X;
}
if (_touchIdY != 0 && _mode.HasFlag(Mode.VerticalDrag))
{
_service.ScrollPositionY -= gesture.Offset.Y;
}
if (_lastMoveTime != null)
{
double time = AppMain.Current.TotalGameTime - _lastMoveTime.Value;
if (_touchIdX != 0 && _mode.HasFlag(Mode.HorizontalDrag))
{
_scrollSpeed.X = (_service.ScrollSpeedX + -gesture.Offset.X / (float)time) / 2;
}
if (_touchIdY != 0 && _mode.HasFlag(Mode.VerticalDrag))
{
_scrollSpeed.Y = (_service.ScrollSpeedY + -gesture.Offset.Y / (float)time) / 2;
}
}
else
{
_scrollSpeed.X = 0;
_scrollSpeed.Y = 0;
}
_lastMoveTime = AppMain.Current.TotalGameTime;
}
break;
}
}
public void OnGesture(Gesture gesture)
{
switch (gesture.GestureType)
{
case GestureType.MouseWheel:
if (_view.IsPointInsideView(gesture.Position))
{
float offset = -gesture.Offset.Y * _wheelSpeed;
if (_wheelScrollsHorizontal)
{
float maxScroll = _service.ScrolledElement.MaxScrollX - _service.ScrolledElement.ScreenBounds.Width;
if ((offset < 0 && _service.ScrollPositionX > 0) || (offset > 0 && _service.ScrollPositionX < maxScroll))
{
_service.ScrollPositionX += offset;
}
}
else
{
float maxScroll = _service.ScrolledElement.MaxScrollY - _service.ScrolledElement.ScreenBounds.Height;
if ((offset < 0 && _service.ScrollPositionY > 0) || (offset > 0 && _service.ScrollPositionY < maxScroll))
{
_service.ScrollPositionY += offset;
}
}
}
break;
case GestureType.Up:
case GestureType.CapturedByOther:
if (_touchIdX == gesture.TouchId)
{
_touchIdX = 0;
_lastMoveTime = null;
_service.ScrollSpeedX = _scrollSpeed.X;
AppMain.Redraw(_view);
}
if (_touchIdY == gesture.TouchId)
{
_touchIdY = 0;
_lastMoveTime = null;
_service.ScrollSpeedY = _scrollSpeed.Y;
AppMain.Redraw(_view);
}
break;
case GestureType.HorizontalDrag:
case GestureType.VerticalDrag:
case GestureType.FreeDrag:
if (gesture.PointerCapturedBy == null)
{
if (_touchIdX == 0 && _touchIdY == 0)
{
if (_view.IsPointInsideView(gesture.Origin))
{
_touchIdX = _touchIdY = gesture.TouchId;
gesture.CapturePointer(_view);
}
}
}
if (_touchIdX == gesture.TouchId || _touchIdY == gesture.TouchId)
{
float maxExceed = (float)_service.MaxExceed.ComputeDouble();
gesture.SetHandled();
if (_touchIdX != 0 && _mode.HasFlag(Mode.HorizontalDrag))
{
if (_service.ScrollPositionX < -maxExceed && gesture.Offset.X > 0)
{
_service.ScrollPositionX = -maxExceed;
}
else if (_service.ScrollPositionX > _service.ScrolledElement.MaxScrollX + maxExceed && gesture.Offset.X < 0)
{
_service.ScrollPositionX = _service.ScrolledElement.MaxScrollX + maxExceed;
}
else
{
_service.ScrollPositionX -= gesture.Offset.X;
}
if (gesture.Offset.X != 0)
{
AppMain.Redraw(_view);
}
}
if (_touchIdY != 0 && _mode.HasFlag(Mode.VerticalDrag))
{
if (_service.ScrollPositionY < -maxExceed && gesture.Offset.Y > 0)
{
_service.ScrollPositionY = -maxExceed;
}
else if (_service.ScrollPositionY > _service.ScrolledElement.MaxScrollY + maxExceed && gesture.Offset.Y < 0)
{
_service.ScrollPositionY = _service.ScrolledElement.MaxScrollY + maxExceed;
}
else
{
_service.ScrollPositionY -= gesture.Offset.Y;
}
if (gesture.Offset.Y != 0)
{
AppMain.Redraw(_view);
}
}
if (_lastMoveTime != null)
{
double time = (gesture.Time - _lastMoveTime.Value).TotalSeconds;
time = Math.Max(time, 0.016f);
if (_touchIdX != 0 && _mode.HasFlag(Mode.HorizontalDrag))
{
_scrollSpeed.X = (_service.ScrollSpeedX - gesture.Offset.X / (float)time) / 2;
}
if (_touchIdY != 0 && _mode.HasFlag(Mode.VerticalDrag))
{
_scrollSpeed.Y = (_service.ScrollSpeedY - gesture.Offset.Y / (float)time) / 2;
}
}
else
{
_scrollSpeed.X = 0;
_scrollSpeed.Y = 0;
}
_lastMoveTime = gesture.Time;
}
break;
}
_service.IsDraggingX = _touchIdX != 0;
_service.IsDraggingY = _touchIdY != 0;
}