public void Construct(float bottom, float contentHeight, float viewHeight)
{
/** Native scroll */
_scrollFriction = scrollFriction;
_scrollDamping = scrollDamping;
_scrollBoundaryAcc = scrollBoundaryAcc;
_scrollMinVel = scrollMinVelocity;
_scrollMaxVel = scrollMaxVelocity;
_scrollTracks = new float[trackSize];
_scrollPrev = 0f;
_scrollTouch = 0f;
_scrollVel = 0f;
_scrollFixBoundary = FixBoundary.None;
/** Easing */
_easing = easing;
_easingMinVel = easingMinVelocity;
_easingSource = 0f;
_easingTarget = 0f;
/** */
_maxPos2 = bottom;
_maxPos1 = _maxPos2 - bottomPadding;
_minPos2 = bottom - (contentHeight - viewHeight);
_minPos1 = _minPos2 + topPadding;
_position = _maxPos1;
_friction = 0f;
_isScrolling = false;
_isHolding = false;
}
public void OnTouchPressed(Vector3 position)
{
/** Native scroll */
// Clear array of y-positions
for (int i = 0; i < trackSize; i++)
{
_scrollTracks[i] = 0;
}
// Set previous y-position
_scrollPrev = position.y;
// Save the current touch y-position
_scrollTouch = position.y;
// Set velocity to zero
_scrollVel = 0f;
// Set type of fix boundary
_scrollFixBoundary = FixBoundary.None;
/** Easing */
// Set source y-position
_easingSource = position.y;
// Set target y-position
_easingTarget = position.y;
/** */
// Sets friction
_friction = _scrollFriction;
//
_isHolding = true;
}
bool UpdateScrolling(float deltaTime)
{
bool isFinished = true;
/** Update native scroll */
// Update y-velocity
if (_scrollVel != 0f)
{
_scrollVel *= _friction;
if (Mathf.Abs(_scrollVel) < _scrollMinVel)
{
_scrollVel = 0f;
}
else
{
// Update y-position
_position += _scrollVel;
}
//
bool isReverse = false;
// Clamp y-position
if (_position < _minPos2)
{
_position = _minPos2;
isReverse = true;
}
else if (_position <= _minPos1)
{
if (_friction >= _scrollFriction)
{
_friction *= _scrollDamping;
}
}
else if (_position > _maxPos2)
{
_position = _maxPos2;
isReverse = true;
}
else if (_position >= _maxPos1)
{
if (_friction >= _scrollFriction)
{
_friction *= _scrollDamping;
}
}
//
if (isReverse)
{
// Clamp scroll velocity
if (_scrollVel > 0)
{
if (_scrollVel > _scrollMaxVel)
{
_scrollVel = _scrollMaxVel;
}
}
else
{
if (-_scrollVel > _scrollMaxVel)
{
_scrollVel = -_scrollMaxVel;
}
}
_scrollVel = -_scrollVel;
_friction = _scrollFriction * _scrollDamping * 1.01f;
}
isFinished = false;
}
// Check boundary
if (_scrollFixBoundary != FixBoundary.None)
{
if (_scrollFixBoundary == FixBoundary.Top)
{
if (_position > _minPos1)
{
_position = _minPos1;
_scrollVel = 0f;
_scrollFixBoundary = FixBoundary.None;
}
else
{
_scrollVel += _scrollBoundaryAcc;
isFinished = false;
}
}
else if (_scrollFixBoundary == FixBoundary.Bottom)
{
if (_position < _maxPos1)
{
_position = _maxPos1;
_scrollVel = 0f;
_scrollFixBoundary = FixBoundary.None;
}
else
{
_scrollVel -= _scrollBoundaryAcc;
isFinished = false;
}
}
}
else
{
if (_position < _minPos1)
{
_scrollFixBoundary = FixBoundary.Top;
isFinished = false;
}
else if (_position > _maxPos1)
{
_scrollFixBoundary = FixBoundary.Bottom;
isFinished = false;
}
}
return(isFinished);
}
