希望能添加的实用功能

[yuyong280]

希望在LayerControl 中添加，双击图层能 将图层中数据 最大化显示， 谢谢。
目前我尝试很久未实现。 多谢大佬的分享。

[hansthen]

Hi yuyong280, would it be possible for you to communicate in English? Most people actively involved in Folium, don't speak much Chinese. Just to confirm what you want; if you select a Layer in LayerControl you want to limit the viewport to the data in that Layer? Or do you want the viewport limited to all the visible Layers?

[yuyong280]

Hello, nice to see your reply. I tried a translation software this time.
I hope to double-click on one of the layers in LayerControl so that the map can maximize the display of the data in that layer.
It's a bit similar to folium.FitOverlays(fly=True, padding=20).add_to(map).But the way the selection is displayed is different.
Thank you.

[yuyong280]

It doesn't change whether the layer is displayed or not, it just changes the field of view to maximize the display of a certain layer of data.

[hansthen]

You could add an EventHandler to the Layer object. This will require you to write some JavaScript code as a python JsCode object. Something like this:

handler = JsCode("""
function onDblClick(event) {
     var layer = event.sourceTarget;
     layer._map.fitBounds(layer.getBounds());

}
""")
layer.on(dblclick=handler)

I don't know how well you know JavaScript. I did not test the code above, but it should come close. The getBounds method will only exist for some layer types. If you also want to zoom to markers, then maybe have a look at this stack overflow entry: https://stackoverflow.com/questions/48954616/leaflet-layer-getbounds-not-a-function. For extra cool points, you can use flyTo.

[hansthen]

Do you mean that you want to double click on the layer's label inside of the LayerControl()?

[hansthen]

Perhaps you can create a short screen recording of what you want to achieve?

[yuyong280]

double click on the layer's label inside of the LayerControl()

[yuyong280]

[hansthen]

I understand. I have to find some time to look into this. I think it should be possible to do this, but I am not sure it can be done using only Folium. You could probably checkout what events are generated by the upstream Leaflet.LayerControl and see if it generates an event for double click.