public void OnBeginDrag(PointerEventData eventData)
{
if(this.itemsAreDraggable)
{
foreach(GameObject go in eventData.hovered)
{
UIInventoryGridEntry entry = go.GetComponent<UIInventoryGridEntry>();
if(entry != null)
{
this.entryBeingDragged = entry;
this.startPosition = entryBeingDragged.rectTransform.anchoredPosition;
this.dragOffset = this.startPosition - new Vector2(Input.mousePosition.x, Input.mousePosition.y);
break;
}
}
}
this.UpdateDropzones();
}
public void OnPointerDown(PointerEventData eventData)
{
foreach(GameObject go in eventData.hovered)
{
UIInventoryGridEntry uiEntry = go.GetComponent<UIInventoryGridEntry>();
if(uiEntry != null)
{
this.selectedEntry = uiEntry;
OnHighlight(uiEntry.entry);
break;
}
}
}
/**
* Updates dropzone states
*/
public void UpdateDropzones(UIInventoryGridEntry uiEntry = null)
{
// Define the entry rect, including current position
Rect entryRect = new Rect();
if(uiEntry == null)
{
uiEntry = this.entryBeingDragged;
}
if(uiEntry != null)
{
entryRect = uiEntry.rectTransform.rect;
entryRect.x = uiEntry.rectTransform.anchoredPosition.x;
entryRect.y = uiEntry.rectTransform.anchoredPosition.y;
// TODO: Why is this necessary? A Y coordinate is inverted somewhere
entryRect.y -= this.slotSize * (uiEntry.entry.item.inventorySize.y - 1);
// Clamp rect position to grid
entryRect.x = (float) Math.Round(entryRect.x / this.slotSize) * this.slotSize;
entryRect.y = (float) Math.Round(entryRect.y / this.slotSize) * this.slotSize;
}
// Look for dropzones
for(int i = 0; i < this.transform.childCount; i++)
{
UIDropzone zone = this.transform.GetChild(i).GetComponent<UIDropzone>();
if(zone != null)
{
// Define the dropzone rect, including position
Rect zoneRect = zone.GetImage().rectTransform.rect;
zoneRect.x = zone.GetImage().rectTransform.anchoredPosition.x;
zoneRect.y = zone.GetImage().rectTransform.anchoredPosition.y;
// Set the dropzone hover state based on rect overlap
bool isHovering = entryRect.Overlaps(zoneRect);
zone.SetHover(isHovering);
}
}
}
public void OnEndDrag(PointerEventData eventData)
{
if(this.itemsAreDraggable && this.entryBeingDragged != null)
{
// If no zone was found, snap back to the start position
Vector2 snapPosition = this.startPosition;
// Look for dropzones
for(int i = 0; i < this.transform.childCount; i++)
{
UIDropzone zone = this.transform.GetChild(i).GetComponent<UIDropzone>();
// If the dropzone is hovered, set that to the snap position
if(zone != null && zone.GetHover())
{
snapPosition = zone.GetImage().rectTransform.anchoredPosition;
break;
}
}
// Get grid position from UI position
int x = (int)Math.Round(snapPosition.x / this.slotSize);
int y = -(int)Math.Round(snapPosition.y / this.slotSize);
// Try to place the entry into the inventory grid
// If this fails, reset the snap position
if(!this.inventory.PlaceIntoGrid(x, y, this.entryBeingDragged.entry))
{
snapPosition = this.startPosition;
}
this.entryBeingDragged.rectTransform.anchoredPosition = snapPosition;
}
this.entryBeingDragged = null;
this.UpdateDropzones(this.selectedEntry);
}