Get notified when tile is removed

Unity Engine
1

Hi,

i have added some gfx objects to my tiles to help displaying different Boxes and animation Ranges in a custom runtime editor. When i add the tile to a tilemap a hidden GameObject renders additional stuff for them. And when i delete the tile or overwrite it (this is pretty easy to check with HasTile()), i remove the hidden GameObject with the tile.

But when i use area fill several tiles could be deleted or overwritten in the process. Is there a way to notify the tile, that it will be removed from the tilemap?

Overwise i have to check every tile in the area if it is empty and i would lose the performance gain by filling an area as a block.

Greetings
Robert

2

Not sure if this will work for you, but you could try setting a Tilemap.tilemapTileChanged callback (Unity - Scripting API: Tilemaps.Tilemap.tilemapTileChanged). If a CellPosition does not have a Tile anymore, if has been deleted, otherwise it has been overwritten or added.

Alternatively, the hidden GameObject for the Tile could be handled using Tile.gameObject (Unity - Scripting API: Tilemaps.Tile.gameObject) The Tile will handle the lifecycle of the hidden GameObject when it is added or deleted.

3

Hi ChuanXin,
thx for the answer. The callback is only available in the editor and not in runtime, so i can’t use it.

The tile.gameObject is already used for prefabs i spawn when the level is played. I could double use this field to spawn a hidden gameObject only in Editor State, but i don’t think this is a very good style and may introduce other problems, but i will have a look at it.

For now i am using Unity - Scripting API: Tilemaps.TileBase.RefreshTile and inside only in Editorstate i check whether there is still a tile in the tilemap or it is a different tiletype.

TileBase tile = tilemap.GetTile( position );

if ((tile == null || !tile.Equals(this)) && hiddenObject != null)
{
    Destroy( hiddenObject );
}