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App.svelte
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App.svelte
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<script>
import mapboxgl from 'mapbox-gl';
import maplibregl from 'maplibre-gl';
import { onMount } from 'svelte';
import {
maps as mapsStore,
stylePresets as stylePresetsStore,
config as configStore,
mapLocations as mapLocationsStore,
linkLocations as linkLocationsStore,
} from './stores';
import { makeConfig } from './make-config';
import { loadPresetsFromUrl } from './presets-utils';
import Maps from './components/Maps.svelte';
import MapControls from './components/MapControls.svelte';
import { createHashString, writeHash } from './query';
import { getSettings } from './settings';
import { validateMapState } from './map-state-utils';
import throttle from 'lodash.throttle';
import isEqual from 'lodash.isequal';
import { addLink } from 'stamen-attribution';
addLink('https://stamen.com/blog/', 'Learn more');
addLink('https://github.com/stamen/maperture', 'Fork on Github');
export let localConfig;
// config is set only once on load and is assumed to be loaded from a module
const config = makeConfig(localConfig);
const { mapboxGlAccessToken, stylePresetUrls } = config;
configStore.set(config);
// settings contains all of the current state of the app that we might want to
// persist in the URL
let settings = getSettings(config);
// mapState is a convenience object, subset of settings
let mapState = {};
// Track when the app is attempting to write the hash
let writingHash = false;
const hashShouldUpdate = () =>
location.hash.slice(1) !== createHashString(settings)?.nextHash;
// Set maps and presets initially using settings
mapsStore.set(settings.maps.map((map, index) => ({ ...map, index })));
stylePresetsStore.set(settings.stylePresets);
mapLocationsStore.set(settings?.locations ?? null);
if ($mapLocationsStore && $mapLocationsStore.length) {
linkLocationsStore.set(false);
}
// Since maps comes from settings, only reset as needed
let maps = [];
$: if (!isEqual(maps, settings.maps)) {
maps = settings.maps;
}
// Validate map state when maps change too
$: mapState = validateMapState(mapState, maps);
onMount(() => {
// If we have URLs for preset files, get them and update presets
if (stylePresetUrls.length > 0) {
stylePresetUrls.forEach(async url => {
const presets = await loadPresetsFromUrl(url);
stylePresetsStore.update(current => [...current, ...presets]);
});
}
});
// Detect changes in hash and update settings appropriately
window.addEventListener('hashchange', () => {
if (!writingHash && hashShouldUpdate()) {
const nextSettings = getSettings(config);
settings = nextSettings;
// Update mapsStore if necessary
if (settings.maps.length) {
const newMaps = settings.maps.map((map, index) => ({
...map,
index,
}));
mapsStore.set(newMaps);
}
}
// Reset so we will see the next change
writingHash = false;
});
mapsStore.subscribe(maps => {
// The isPolling key never makes it to the hash so we can know if prop updates downstream
// in MapStyleInputWrapper are coming from polled styles or from history
const nextMaps = JSON.parse(JSON.stringify(maps)).map(m => {
delete m.isPolling;
return m;
});
settings = { ...settings, maps: nextMaps };
});
mapLocationsStore.subscribe(locations => {
settings = { ...settings, locations };
});
linkLocationsStore.subscribe(value => {
if (!value && !$mapLocationsStore) {
const mapLocations = maps.map(() => mapState);
mapLocationsStore.set(mapLocations);
}
if (value && $mapLocationsStore) {
mapLocationsStore.set(null);
}
});
// Throttle writing to the hash since this can get invoked many times when
// moving the map around
const throttledWriteHash = throttle(() => {
if (hashShouldUpdate()) {
writingHash = true;
writeHash(settings);
}
}, 250);
const createMapState = () => {
const {
bearing,
center,
pitch,
showCollisions,
showBoundaries,
showDiff,
zoom,
height,
width,
} = settings;
return {
bearing,
center,
pitch,
showCollisions,
showBoundaries,
showDiff,
zoom,
...(height && { height }),
...(width && { width }),
};
};
const handleMapState = event => {
let newMapState = {
...mapState,
...event.detail.options,
};
settings = {
...settings,
...validateMapState(newMapState, maps),
};
};
const handleViewMode = event => {
settings = {
...settings,
viewMode: event.detail.mode,
};
};
const handleDimensions = event => {
settings = {
...settings,
// contains width and height
...event.detail,
};
};
$: if (settings) throttledWriteHash();
$: if (settings || height || width) mapState = createMapState();
// Set RTL plugin once rather than per map
mapboxgl.setRTLTextPlugin(
'https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-rtl-text/v0.2.0/mapbox-gl-rtl-text.js'
);
maplibregl.setRTLTextPlugin(
'https://unpkg.com/@mapbox/mapbox-gl-rtl-text@0.2.3/mapbox-gl-rtl-text.min.js'
);
</script>
<svelte:head>
<base href="process.env.BASE_PATH" />
</svelte:head>
<main>
<Maps
{maps}
{mapState}
viewMode={settings.viewMode}
on:mapState={handleMapState}
on:setDimensions={handleDimensions}
/>
<div class="attribution-space" />
<div class="map-controls-container">
<MapControls
{mapboxGlAccessToken}
{...mapState}
viewMode={settings.viewMode}
on:mapState={handleMapState}
on:viewMode={handleViewMode}
/>
</div>
</main>
<style>
main {
display: flex;
flex-direction: column;
height: 100%;
}
.attribution-space {
height: 33px;
width: 100%;
background-color: black;
}
.map-controls-container {
display: flex;
flex-direction: row;
justify-content: center;
pointer-events: none;
position: absolute;
top: 1em;
width: 100%;
z-index: 2000;
}
</style>