public bool Calculate(float deltaPosOnAxis, float scrollerElementLocalPosOnAxis, int dimension)
{
float cursorOffsetInPixel = thisScroller.GetElementCursorOffsetInPixel(scrollerElementLocalPosOnAxis, dimension);
if (deltaPosOnAxis == 0f)
{
return(false);
}
else
{
if (cursorOffsetInPixel == 0f)
{
return(false);
}
else
{
if (cursorOffsetInPixel < 0f) //too right
{
return(deltaPosOnAxis > 0f);
}
else //displacement > 0f: too left
{
return(deltaPosOnAxis < 0f);
}
}
}
}
public void Calculate_DeltaPosZero_ReturnsFalse()
{
IScroller scroller = Substitute.For <IScroller>();
scroller.GetElementCursorOffsetInPixel(Arg.Any <float>(), Arg.Any <int>()).Returns(0f);
ElementIsScrolledToIncreaseCursorOffsetCalculator calculator = new ElementIsScrolledToIncreaseCursorOffsetCalculator(scroller);
float anyLocalPosOnAxis = 222222222f;
for (int i = 0; i < 2; i++)
{
bool actual = calculator.Calculate(0f, anyLocalPosOnAxis, i);
Assert.That(actual, Is.False);
}
}
public void Calculate_DeltaPosNonZero_ElementCursorOfffsetPixelIsNotZero_Various(float cursorOffsetInPixel, float deltaPosOnAxis, bool expected)
{
IScroller scroller = Substitute.For <IScroller>();
scroller.GetElementCursorOffsetInPixel(Arg.Any <float>(), Arg.Any <int>()).Returns(cursorOffsetInPixel);
ElementIsScrolledToIncreaseCursorOffsetCalculator calculator = new ElementIsScrolledToIncreaseCursorOffsetCalculator(scroller);
float anyLocalPosOnAxis = -1111111f;
for (int i = 0; i < 2; i++)
{
bool actual = calculator.Calculate(deltaPosOnAxis, anyLocalPosOnAxis, i);
Assert.That(actual, Is.EqualTo(expected));
}
}
