Constrain bounds of TileLayer

Would it be possible to add a property to the TileLayer that will constrain its bounds?

The lack of constraint poses a problem when accessing a tile server I have that serves individual rasters (small coverage, not global). The TileLayer continues to make requests from my tile server anytime I zoom out/view outside the data bounds, overloading my tile server which is just returning a bunch of transparent PNGs.

The logic I’m looking for:

t = TileLayer(
    url="https://mytileserver.com/tiles/{z}/{x}/{y}.png?projection=EPSG:3857",
    # Do not request tile outside of these bounds (bottom, top, left, right)
    bounds=[37.40679, 38.080379, -122.759396, -122.065103],
)

From what I can tell, the leaflet JS tileLayer does have an option for bounds that is inherited from gridLayer but this does not seem to be wrapped in ipyleaflet. Ref https://leafletjs.com/reference.html#tilelayer

Example data:

---

Additional context:

• https://github.com/banesullivan/flask-tileserver / https://github.com/jupyter-widgets/ipyleaflet/issues/234#issuecomment-974716145
• https://github.com/ResonantGeoData/ResonantGeoData/pull/603

[banesullivan]

Aha! That’s awesome! I can confirm that ((south, west), (north, east)) works!

before	after

There’s a nifty “debug” tile server in localtileserver which is live here: https://tileserver.banesullivan.com/tiles/debug/{z}/{x}/{y}.png?sleep=0

from ipyleaflet import Map, TileLayer
from traitlets import Tuple

class BoundTileLayer(TileLayer):
    bounds = Tuple(default_value=None, allow_none=True).tag(sync=True, o=True)

b = (23.564991210892646,
 25.550873767434343,
 -78.95864996539397,
 -76.57492370013779)

t = BoundTileLayer(
    url='https://tileserver.banesullivan.com/tiles/debug/{z}/{x}/{y}.png?sleep=0',
    # Do not request tile outside of these bounds ((south, west), (north, east))
    bounds=((b[0],b[2]), (b[1], b[3])),
)

m = Map(center=[31.092678045970622, -73.68000268936159], zoom=4)
m.add_layer(t)
m

[davidbrochart]

Not quite, the bounds must be in the form:

((south, west), (north, east))

I’ll open a PR.