public void CellsInitialSetup()
{
if (numberOfCellPrefabs == 0)
{
return;
}
rectTransform = GetComponent <RectTransform>();
caroselCells = new CaroselCell[numberOfCellPrefabs];
for (int i = 0; i < numberOfCellPrefabs; i++)
{
CaroselCell cell = Instantiate(cellPrefab).GetComponent <CaroselCell>();
cell.name = "Cell_" + i;
cell.transform.SetParent(rectTransform, false);
caroselCells[i] = cell;
}
width = rectTransform.rect.width;
height = rectTransform.rect.height;
childWidth = caroselCells[0].GetComponent <RectTransform>().rect.width;
childHeight = caroselCells[0].GetComponent <RectTransform>().rect.height;
float posOffset = childWidth * 0.5f;
for (int i = 0; i < caroselCells.Length; i++)
{
caroselCells[i].cellIndex = i;
Vector2 childPos = caroselCells[i].GetComponent <RectTransform>().localPosition;
childPos.x = posOffset + i * (childWidth + itemSpacing);
caroselCells[i].GetComponent <RectTransform>().localPosition = childPos;
}
}
private void HandleHorizontalScroll()
{
bool swipeRight = dragDirection == DragDirection.Right;
// Getting the rightmost or leftmost cell Object depending on swipe direction
int currentPrefabIndex = swipeRight ? scrollRect.content.childCount - 1 : 0;
var currentItemTransform = scrollRect.content.GetChild(currentPrefabIndex);
// Determine whether the cell needs repositioning
if (!ReachedThreshold(currentItemTransform))
{
return;
}
// Find the cell object which the current object should be positioned next to
int endPrefabIndex = swipeRight ? 0 : scrollRect.content.childCount - 1;
Transform endItemTransform = scrollRect.content.GetChild(endPrefabIndex);
// Calculate the new position for the cell
Vector2 newPos = endItemTransform.position;
newPos.x = swipeRight
? endItemTransform.position.x - (scrollContent.ChildWidth + scrollContent.ItemSpacing)
: endItemTransform.position.x + (scrollContent.ChildWidth + scrollContent.ItemSpacing);
currentItemTransform.position = newPos;
// Assign new cell index to the current cell
int endItemCellIndex = endItemTransform.GetComponent <CaroselCell>().cellIndex;
int currentItemCellIndex = swipeRight ? endItemCellIndex - 1 : endItemCellIndex + 1;
CaroselCell currentCell = currentItemTransform.GetComponent <CaroselCell>();
currentCell.cellIndex = currentItemCellIndex;
currentItemTransform.SetSiblingIndex(endPrefabIndex);
// Update cell content according to the new index
// Since it's an endless scroll, the currentItemCellIndex can be very large or very small
// Take modular to decide what content to display
int totalNumberOfItems = dataSource.GetNumberOfItemsForCaroselView();
int contentIndex = (currentItemCellIndex >= 0) ? currentItemCellIndex % totalNumberOfItems : totalNumberOfItems - Math.Abs(currentItemCellIndex % totalNumberOfItems);
dataSource.UpdateCellInCaroselView(currentCell, contentIndex);
}
public void UpdateCellInCaroselView(CaroselCell cell, int row)
{
BookCell bookCell = cell as BookCell;
bookCell.bookTitle.text = "Book " + row;
}