private IEnumerator <object> HandleDragTask(VelocityMeter velocityMeter, float mouseProjectedPosition, DragGesture dragGesture)
{
if (!CanScroll || !ScrollWhenContentFits && MaxScrollPosition == 0 || ScrollBySlider)
{
yield break;
}
// Do not block scrollview on refresh gesture
IsBeingRefreshed = false;
IsDragging = true;
float realScrollPosition = ScrollPosition;
wheelScrollState = WheelScrollState.Stop;
while (dragGesture.IsChanging())
{
var newMouseProjectedPosition = ProjectToScrollAxisWithFrameRotation(Input.MousePosition);
realScrollPosition += mouseProjectedPosition - newMouseProjectedPosition;
// Round scrolling position to prevent blurring
ScrollPosition = ClampScrollPositionWithinBounceZone(realScrollPosition).Round();
mouseProjectedPosition = newMouseProjectedPosition;
velocityMeter.AddSample(realScrollPosition);
yield return(null);
}
StartScrolling(InertialScrollingTask(velocityMeter.CalcVelocity()));
IsDragging = false;
}
private IEnumerator <object> SpinByDragTask(DragGesture dragGesture)
{
RaiseBeginSpin();
try {
isDragging = true;
var startValue = Value;
var startMousePosition = Application.DesktopMousePosition;
float accumulator = 0.0f;
while (dragGesture.IsChanging())
{
var mousePosition = Application.DesktopMousePosition;
var disp = CommonWindow.Current.Display;
var wrapped = false;
if (Application.DesktopMousePosition.X > disp.Position.X + disp.Size.X - 5)
{
accumulator += disp.Position.X + disp.Size.X - 5 - startMousePosition.X;
startMousePosition.X = mousePosition.X = disp.Position.X + 5;
wrapped = true;
}
if (Application.DesktopMousePosition.X < disp.Position.X + 5)
{
accumulator -= startMousePosition.X - disp.Position.X - 5;
startMousePosition.X = mousePosition.X = disp.Position.X + disp.Size.X - 5;
wrapped = true;
}
if (wrapped)
{
Application.DesktopMousePosition = new Vector2(mousePosition.X, Application.DesktopMousePosition.Y);
}
var delta = (mousePosition.X - startMousePosition.X + accumulator).Round() * Step;
if (Input.IsKeyPressed(Key.Shift))
{
delta *= 10f;
}
else if (Input.IsKeyPressed(Key.Control))
{
delta *= 0.1f;
}
if (!IsReadOnly)
{
Value = startValue + delta;
}
yield return(null);
}
} finally {
isDragging = false;
RaiseEndSpin();
}
}
void Advance()
{
if (Thumb == null)
{
return;
}
var draggingJustBegun = false;
if (GloballyEnabled && RangeMax > RangeMin)
{
if (dragGestureThumb.WasRecognized())
{
activeDragGesture = dragGestureThumb;
TryStartDrag();
draggingJustBegun = true;
}
else
{
if (clickGesture.WasBegan())
{
TryStartDrag();
SetValueFromCurrentMousePosition(false);
}
if (clickGesture.WasRecognizedOrCanceled() && !dragGestureSlider.WasRecognized())
{
TryEndDrag();
}
if (dragGestureSlider.WasRecognized())
{
activeDragGesture = dragGestureSlider;
TryStartDrag();
dragInitialDelta = 0;
dragInitialOffset = (Value - RangeMin) / (RangeMax - RangeMin);
draggingJustBegun = false;
}
}
}
if (activeDragGesture?.WasEnded() ?? false)
{
TryEndDrag();
}
if (Enabled && (activeDragGesture?.IsChanging() ?? false))
{
SetValueFromCurrentMousePosition(draggingJustBegun);
}
InterpolateGraphicsBetweenMinAndMaxMarkers();
RefreshThumbPosition();
}
private IEnumerator <object> SpinByDragTask(DragGesture dragGesture)
{
RaiseBeginSpin();
try {
var prevMousePos = Application.DesktopMousePosition;
while (dragGesture.IsChanging())
{
var disp = CommonWindow.Current.Display;
var wrapped = false;
if (Application.DesktopMousePosition.X > disp.Position.X + disp.Size.X - 5)
{
prevMousePos.X = disp.Position.X + 5;
wrapped = true;
}
if (Application.DesktopMousePosition.X < disp.Position.X + 5)
{
prevMousePos.X = disp.Position.X + disp.Size.X - 5;
wrapped = true;
}
if (wrapped)
{
Application.DesktopMousePosition = new Vector2(prevMousePos.X, Application.DesktopMousePosition.Y);
}
var delta = (Application.DesktopMousePosition.X - prevMousePos.X).Round() * Step;
if (Input.IsKeyPressed(Key.Shift))
{
delta *= 10f;
}
else if (Input.IsKeyPressed(Key.Control))
{
delta *= 0.1f;
}
if (!IsReadOnly)
{
Value += delta;
}
prevMousePos = Application.DesktopMousePosition;
yield return(null);
}
} finally {
RaiseEndSpin();
}
}