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klein panic
2024-09-29 01:46:07 -04:00
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from branca.element import MacroElement
from jinja2 import Template
from folium import Map
from folium.elements import JSCSSMixin
from folium.features import FeatureGroup, GeoJson, TopoJson
from folium.plugins import MarkerCluster
from folium.utilities import parse_options
class Search(JSCSSMixin, MacroElement):
"""
Adds a search tool to your map.
Parameters
----------
layer: GeoJson, TopoJson, FeatureGroup, MarkerCluster class object.
The map layer to index in the Search view.
search_label: str, optional
'properties' key in layer to index Search, if layer is GeoJson/TopoJson.
search_zoom: int, optional
Zoom level to set the map to on match.
By default zooms to Polygon/Line bounds and points
on their natural extent.
geom_type: str, default 'Point'
Feature geometry type. "Point", "Line" or "Polygon"
position: str, default 'topleft'
Change the position of the search bar, can be:
'topleft', 'topright', 'bottomright' or 'bottomleft',
placeholder: str, default 'Search'
Placeholder text inside the Search box if nothing is entered.
collapsed: boolean, default False
Whether the Search box should be collapsed or not.
**kwargs.
Assorted style options to change feature styling on match.
Use the same way as vector layer arguments.
See https://github.com/stefanocudini/leaflet-search for more information.
"""
_template = Template(
"""
{% macro script(this, kwargs) %}
var {{this.layer.get_name()}}searchControl = new L.Control.Search({
layer: {{this.layer.get_name()}},
{% if this.search_label %}
propertyName: '{{this.search_label}}',
{% endif %}
collapsed: {{this.collapsed|tojson|safe}},
textPlaceholder: '{{this.placeholder}}',
position:'{{this.position}}',
{% if this.geom_type == 'Point' %}
initial: false,
{% if this.search_zoom %}
zoom: {{this.search_zoom}},
{% endif %}
hideMarkerOnCollapse: true
{% else %}
marker: false,
moveToLocation: function(latlng, title, map) {
var zoom = {% if this.search_zoom %} {{ this.search_zoom }} {% else %} map.getBoundsZoom(latlng.layer.getBounds()) {% endif %}
map.flyTo(latlng, zoom); // access the zoom
}
{% endif %}
});
{{this.layer.get_name()}}searchControl.on('search:locationfound', function(e) {
{{this.layer.get_name()}}.setStyle(function(feature){
return feature.properties.style
})
{% if this.options %}
e.layer.setStyle({{ this.options|tojson }});
{% endif %}
if(e.layer._popup)
e.layer.openPopup();
})
{{this.layer.get_name()}}searchControl.on('search:collapsed', function(e) {
{{this.layer.get_name()}}.setStyle(function(feature){
return feature.properties.style
});
});
{{this._parent.get_name()}}.addControl( {{this.layer.get_name()}}searchControl );
{% endmacro %}
""" # noqa
)
default_js = [
(
"Leaflet.Search.js",
"https://cdn.jsdelivr.net/npm/leaflet-search@2.9.7/dist/leaflet-search.min.js",
)
]
default_css = [
(
"Leaflet.Search.css",
"https://cdn.jsdelivr.net/npm/leaflet-search@2.9.7/dist/leaflet-search.min.css",
)
]
def __init__(
self,
layer,
search_label=None,
search_zoom=None,
geom_type="Point",
position="topleft",
placeholder="Search",
collapsed=False,
**kwargs,
):
super().__init__()
assert isinstance(layer, (GeoJson, MarkerCluster, FeatureGroup, TopoJson)), (
"Search can only index FeatureGroup, "
"MarkerCluster, GeoJson, and TopoJson layers at "
"this time."
)
self.layer = layer
self.search_label = search_label
self.search_zoom = search_zoom
self.geom_type = geom_type
self.position = position
self.placeholder = placeholder
self.collapsed = collapsed
self.options = parse_options(**kwargs)
def test_params(self, keys):
if keys is not None and self.search_label is not None:
assert self.search_label in keys, (
f"The label '{self.search_label}' was not " f"available in {keys}" ""
)
assert isinstance(
self._parent, Map
), "Search can only be added to folium Map objects."
def render(self, **kwargs):
if isinstance(self.layer, GeoJson):
keys = tuple(self.layer.data["features"][0]["properties"].keys())
elif isinstance(self.layer, TopoJson):
obj_name = self.layer.object_path.split(".")[-1]
keys = tuple(
self.layer.data["objects"][obj_name]["geometries"][0][
"properties"
].keys()
) # noqa
else:
keys = None
self.test_params(keys=keys)
super().render(**kwargs)