// Update the scroll bar's position based on the mouse.
void UpdateDrag(PointerEventData eventData)
{
if (eventData.button != PointerEventData.InputButton.Left)
{
return;
}
if (m_ContainerRect == null)
{
return;
}
Vector2 position = Vector2.zero;
if (!MultipleDisplayUtilities.GetRelativeMousePositionForDrag(eventData, ref position))
{
return;
}
Vector2 localCursor;
if (!RectTransformUtility.ScreenPointToLocalPointInRectangle(m_ContainerRect, position, eventData.pressEventCamera, out localCursor))
{
return;
}
Vector2 handleCenterRelativeToContainerCorner = localCursor - m_Offset - m_ContainerRect.rect.position;
Vector2 handleCorner = handleCenterRelativeToContainerCorner - (m_HandleRect.rect.size - m_HandleRect.sizeDelta) * 0.5f;
float parentSize = axis == 0 ? m_ContainerRect.rect.width : m_ContainerRect.rect.height;
float remainingSize = parentSize * (1 - size);
if (remainingSize <= 0)
{
return;
}
DoUpdateDrag(handleCorner, remainingSize);
}
// Update the slider's position based on the mouse.
void UpdateDrag(PointerEventData eventData, Camera cam)
{
RectTransform clickRect = m_HandleContainerRect ?? m_FillContainerRect;
if (clickRect != null && clickRect.rect.size[(int)axis] > 0)
{
Vector2 position = Vector2.zero;
if (!MultipleDisplayUtilities.GetRelativeMousePositionForDrag(eventData, ref position))
{
return;
}
Vector2 localCursor;
if (!RectTransformUtility.ScreenPointToLocalPointInRectangle(clickRect, position, cam, out localCursor))
{
return;
}
localCursor -= clickRect.rect.position;
float val = Mathf.Clamp01((localCursor - m_Offset)[(int)axis] / clickRect.rect.size[(int)axis]);
normalizedValue = (reverseValue ? 1f - val : val);
}
}