private float PageMovementValue()
{
float currentValue = this.currentValue;
int num2 = (this.start <= this.end) ? 1 : -1;
if (this.MousePosition() > this.PageUpMovementBound())
{
currentValue += (this.size * num2) * 0.9f;
}
else
{
currentValue -= (this.size * num2) * 0.9f;
}
return this.Clamp(currentValue);
}