tdesktop/Telegram/Resources/picker_html/picker.js

var LocationPicker = {
	startZoom: 14,
	flySpeed: 2.4,
	notify: function(message) {
		if (window.external && window.external.invoke) {
			window.external.invoke(JSON.stringify(message));
		}
	},
	frameKeyDown: function (e) {
		const keyW = (e.key === 'w')
			|| (e.code === 'KeyW')
			|| (e.keyCode === 87);
		const keyQ = (e.key === 'q')
			|| (e.code === 'KeyQ')
			|| (e.keyCode === 81);
		const keyM = (e.key === 'm')
			|| (e.code === 'KeyM')
			|| (e.keyCode === 77);
		if ((e.metaKey || e.ctrlKey) && (keyW || keyQ || keyM)) {
			e.preventDefault();
			LocationPicker.notify({
				event: 'keydown',
				modifier: e.ctrlKey ? 'ctrl' : 'cmd',
				key: keyW ? 'w' : keyQ ? 'q' : 'm',
			});
		} else if (e.key === 'Escape' || e.keyCode === 27) {
			e.preventDefault();
			LocationPicker.notify({
				event: 'keydown',
				key: 'escape',
			});
		}
	},
	updateStyles: function (styles) {
		if (LocationPicker.styles !== styles) {
			LocationPicker.styles = styles;
			document.getElementsByTagName('html')[0].style = styles;
		}
	},
	init: function (params) {
		mapboxgl.accessToken = params.token;
		if (params.protocol) {
			mapboxgl.config.API_URL = params.protocol + '://domain/api.mapbox.com';
		}

		var options = { container: 'map' };
		var center = params.center;
		if (center) {
			center = [center[1], center[0]];
			options.center = center;
			options.zoom = LocationPicker.startZoom;
		} else if (params.bounds) {
			options.bounds = params.bounds;
			center = new mapboxgl.LngLatBounds(params.bounds).getCenter();
		} else {
			center = [0, 0];
		}
		LocationPicker.map = new mapboxgl.Map(options);

		const marker = new mapboxgl.Marker()
			.setLngLat(center)
			.addTo(LocationPicker.map);
		const drop = document.getElementById('marker_drop');
		const element = marker.getElement();
		drop.innerHTML = element.innerHTML;
		const offset = marker.getOffset();
		drop.style.transform = 'translate(' + offset.x + 'px, ' + offset.y + 'px)';
		marker.remove();
	},
	narrowTo: function (point) {
		LocationPicker.map.flyTo({
			center: [point[1], point[0]],
			zoom: LocationPicker.startZoom,
			speed: LocationPicker.flySpeed,
		});
	},
	send: function () {
		LocationPicker.notify({
			event: 'send',
			latitude: LocationPicker.map.getCenter().lat,
			longitude: LocationPicker.map.getCenter().lng
		});
	}
};