Maps Integration for Delta Chat clients

An "Integration" is a webxdc file that speaks to the deltachat-core-library instead of other webxdc instances. From the view of the messenger implementor, the integrations behave like a normal webxdc.

To use this integration in a client, get a core with 1.137.4 or newer, build maps.xdc as described below, add it to the client using dc_set_webxdc_integration()/dc_init_webxdc_integration() and open it as a usual webxdc.

The map is shown using Leaflet and looks like the following:

The protocol used to speak to core is described atop of maps_integration.rs.

Compared to eg. Mapbox on Android, this solution is 8mb smaller and has 2000+ lines less boilerplate code.

In general, however, the integration could use other maps as well, it is not bound to Leaflet.

Online Demo

Building

to create maps.xdc file, execute:

./create-xdc.sh

Note, that maps.xdc is meant to be used as an integration as described below and will work only limited when send to a chat.