Press n or j to go to the next uncovered block, b, p or k for the previous block.
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useRef,
useEffect,
useImperativeHandle,
forwardRef,
} from "react";
import { View, StyleSheet, ActivityIndicator, Text } from "react-native";
import { WebView } from "react-native-webview";
import { Asset } from "expo-asset";
import { RoutePoint } from "../types/indoorDirections";
import { BuildingId } from "../data/buildings";
export interface PoiMarker {
x: number;
y: number;
id: string;
displayName: string;
type: string;
}
export interface RoomMarkerData {
x: number;
y: number;
id: string;
}
interface FloorPlanWebViewProps {
buildingId?: BuildingId;
floorNumber?: string;
backgroundColor?: string;
invertSvg?: boolean;
onPoiTap?: (poi: PoiMarker) => void;
onRoomTap?: (room: RoomMarkerData) => void;
routePoints?: RoutePoint[];
poiData?: PoiMarker[];
roomData?: RoomMarkerData[];
}
export interface FloorPlanWebViewRef {
drawRoute: (routePoints: RoutePoint[]) => void;
clearRoute: () => void;
showRoomMarkers: (
roomPoints: Array<{ x: number; y: number; id: string }>,
) => void;
hideRoomMarkers: () => void;
showPois: (pois: PoiMarker[]) => void;
hidePois: () => void;
}
const SVG_ASSETS: Record<string, Record<string, any>> = {
H: {
"8": require("../../assets/building_plans/h8.svg"),
"9": require("../../assets/building_plans/Hall-9.svg"),
"2": require("../../assets/building_plans/Hall-2.svg"),
"1": require("../../assets/building_plans/Hall-1.svg"),
},
VL: {
"1": require("../../assets/building_plans/VL-1.svg"),
"2": require("../../assets/building_plans/VL-2.svg"),
},
LB: {
"2": require("../../assets/building_plans/LB2-n-s.svg"),
"3": require("../../assets/building_plans/LB3-n-s.svg"),
"4": require("../../assets/building_plans/LB4-n-s.svg"),
"5": require("../../assets/building_plans/LB5-n-s.svg"),
},
MB: {
S2: require("../../assets/building_plans/MB-S2.svg"),
"1": require("../../assets/building_plans/MB-1.svg"),
},
CC: {
"1": require("../../assets/building_plans/CC1.svg"),
},
VE: {
"1": require("../../assets/building_plans/VE-1.svg"),
"2": require("../../assets/building_plans/VE-2.svg"),
},
};
function getSvgAsset(buildingId: BuildingId, floorNumber: string): any {
return SVG_ASSETS[buildingId]?.[floorNumber] ?? null;
}
function getErrorMessage(error: unknown): string {
Eif (error instanceof Error) return error.message;
return String(error);
}
const FloorPlanWebView = forwardRef<FloorPlanWebViewRef, FloorPlanWebViewProps>(
(
{
buildingId = "H",
floorNumber = "8",
backgroundColor,
invertSvg = false,
onPoiTap,
onRoomTap,
routePoints: propRoutePoints,
poiData,
roomData,
},
ref,
) => {
const webViewRef = useRef<WebView>(null);
const [svgHtml, setSvgHtml] = React.useState<string | null>(null);
const [isWebViewReady, setIsWebViewReady] = React.useState(false);
const isWebViewReadyRef = React.useRef(false);
const pendingRouteRef = React.useRef<RoutePoint[] | null>(null);
const floorVersionRef = React.useRef(0);
const loadedFloorRef = React.useRef<string | null>(null);
const markWebViewReady = React.useCallback(
(ready: boolean, floor?: string) => {
isWebViewReadyRef.current = ready;
if (floor !== undefined) loadedFloorRef.current = floor;
if (!ready) loadedFloorRef.current = null;
setIsWebViewReady(ready);
},
[],
);
useEffect(() => {
const version = floorVersionRef.current + 1;
let cancelled = false;
floorVersionRef.current = version;
markWebViewReady(false);
pendingRouteRef.current = null;
setSvgHtml(null);
Iif (webViewRef.current) {
webViewRef.current.injectJavaScript(`
(function() { if (window.clearRoute) window.clearRoute(); true; })();
`);
}
const loadSvg = async () => {
try {
const asset = getSvgAsset(buildingId, floorNumber);
if (!asset) {
console.error("No SVG asset found for", buildingId, floorNumber);
return;
}
const assetModule = await Asset.fromModule(asset).downloadAsync();
Iif (cancelled || version !== floorVersionRef.current) return;
const uri = assetModule.localUri || assetModule.uri;
const response = await fetch(uri);
const svgText = await response.text();
Iif (cancelled || version !== floorVersionRef.current) return;
const svgMatch = new RegExp(/<svg[\s\S]*<\/svg>/i).exec(svgText);
Eif (svgMatch) {
let svgContent = svgMatch[0];
if (!svgContent.includes("viewBox")) {
svgContent = svgContent.replace(
/<svg/,
'<svg viewBox="0 0 1024 1024"',
);
}
Eif (!svgContent.includes("preserveAspectRatio")) {
svgContent = svgContent.replace(
/<svg/,
'<svg preserveAspectRatio="xMidYMid meet"',
);
}
const bg = backgroundColor ?? "white";
const svgFilter = invertSvg ? "filter: invert(1);" : "";
const html = `
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=10.0, minimum-scale=0.1, user-scalable=yes">
<style>
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
width: 100%;
height: 100%;
background: ${bg};
overflow: auto;
-webkit-overflow-scrolling: touch;
}
body {
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
padding: 10px;
}
svg {
display: block;
max-width: 100vw;
max-height: 100vh;
width: auto;
height: auto;
${svgFilter}
}
</style>
</head>
<body>
${svgContent}
<script>
(function() {
const svg = document.querySelector('svg');
if (!svg) return;
const SVG_NS = 'http://www.w3.org/2000/svg';
// All coordinates are pre-transformed in the backend to root SVG space.
// The frontend simply renders them as-is (pass-through).
window.drawRouteFromPoints = function(routePoints) {
try {
if (!routePoints || routePoints.length < 2) return false;
['#routePath', '#routePathOutline', '#startMarker', '#endMarker'].forEach(function(sel) {
try {
var el = svg.querySelector(sel);
if (el && el.parentNode) el.parentNode.removeChild(el);
} catch(e) {}
});
// Build SVG path data through all waypoints
var pathData = 'M ' + routePoints[0].x + ' ' + routePoints[0].y;
for (var i = 1; i < routePoints.length; i++) {
pathData += ' L ' + routePoints[i].x + ' ' + routePoints[i].y;
}
var pathOutline = document.createElementNS(SVG_NS, 'path');
pathOutline.id = 'routePathOutline';
pathOutline.setAttribute('d', pathData);
pathOutline.setAttribute('stroke', '#FFFFFF');
pathOutline.setAttribute('stroke-width', '16');
pathOutline.setAttribute('fill', 'none');
pathOutline.setAttribute('stroke-linecap', 'round');
pathOutline.setAttribute('stroke-linejoin', 'round');
pathOutline.setAttribute('stroke-dasharray', '4 18');
pathOutline.setAttribute('style', 'pointer-events: none;');
svg.appendChild(pathOutline);
var path = document.createElementNS(SVG_NS, 'path');
path.id = 'routePath';
path.setAttribute('d', pathData);
path.setAttribute('stroke', '#8B1538');
path.setAttribute('stroke-width', '12');
path.setAttribute('fill', 'none');
path.setAttribute('stroke-linecap', 'round');
path.setAttribute('stroke-linejoin', 'round');
path.setAttribute('stroke-dasharray', '4 18');
path.setAttribute('style', 'pointer-events: none;');
svg.appendChild(path);
var startPoint = routePoints[0];
var startMarker = document.createElementNS(SVG_NS, 'g');
startMarker.id = 'startMarker';
startMarker.setAttribute('transform', 'translate(' + startPoint.x + ',' + startPoint.y + ')');
startMarker.setAttribute('style', 'pointer-events: none;');
var sc = document.createElementNS(SVG_NS, 'circle');
sc.setAttribute('cx', '0'); sc.setAttribute('cy', '-8'); sc.setAttribute('r', '10');
sc.setAttribute('fill', '#8B1538'); sc.setAttribute('stroke', '#fff'); sc.setAttribute('stroke-width', '2');
startMarker.appendChild(sc);
var st = document.createElementNS(SVG_NS, 'path');
st.setAttribute('d', 'M -6,2 L 0,18 L 6,2 Z');
st.setAttribute('fill', '#8B1538'); st.setAttribute('stroke', '#fff'); st.setAttribute('stroke-width', '2');
startMarker.appendChild(st);
var sd = document.createElementNS(SVG_NS, 'circle');
sd.setAttribute('cx', '0'); sd.setAttribute('cy', '-8'); sd.setAttribute('r', '4');
sd.setAttribute('fill', '#fff');
startMarker.appendChild(sd);
svg.appendChild(startMarker);
var endPoint = routePoints[routePoints.length - 1];
var endMarker = document.createElementNS(SVG_NS, 'g');
endMarker.id = 'endMarker';
endMarker.setAttribute('transform', 'translate(' + endPoint.x + ',' + endPoint.y + ')');
endMarker.setAttribute('style', 'pointer-events: none;');
var ec = document.createElementNS(SVG_NS, 'circle');
ec.setAttribute('cx', '0'); ec.setAttribute('cy', '-8'); ec.setAttribute('r', '10');
ec.setAttribute('fill', '#8B1538'); ec.setAttribute('stroke', '#fff'); ec.setAttribute('stroke-width', '2');
endMarker.appendChild(ec);
var et = document.createElementNS(SVG_NS, 'path');
et.setAttribute('d', 'M -6,2 L 0,18 L 6,2 Z');
et.setAttribute('fill', '#8B1538'); et.setAttribute('stroke', '#fff'); et.setAttribute('stroke-width', '2');
endMarker.appendChild(et);
var ed = document.createElementNS(SVG_NS, 'circle');
ed.setAttribute('cx', '0'); ed.setAttribute('cy', '-8'); ed.setAttribute('r', '4');
ed.setAttribute('fill', '#fff');
endMarker.appendChild(ed);
svg.appendChild(endMarker);
return true;
} catch (error) {
console.error('Error in drawRouteFromPoints:', error);
return false;
}
};
window.clearRoute = function() {
['#routePath', '#routePathOutline', '#startMarker', '#endMarker'].forEach(function(sel) {
try {
var el = svg.querySelector(sel);
if (el && el.parentNode) el.parentNode.removeChild(el);
} catch(e) {}
});
};
window.showRoomMarkers = function(roomPoints) {
try {
if (!roomPoints || roomPoints.length === 0) return;
window.hideRoomMarkers();
var g = document.createElementNS(SVG_NS, 'g');
g.id = 'roomMarkersGroup';
roomPoints.forEach(function(room) {
if (!room || !room.id) return;
var x = room.x, y = room.y;
if (isNaN(x) || isNaN(y)) return;
var sz = 10;
var rect = document.createElementNS(SVG_NS, 'rect');
rect.setAttribute('x', (x - sz).toString());
rect.setAttribute('y', (y - sz).toString());
rect.setAttribute('width', (sz * 2).toString());
rect.setAttribute('height', (sz * 2).toString());
rect.setAttribute('rx', '3'); rect.setAttribute('ry', '3');
rect.setAttribute('fill', '#FF6B35');
rect.setAttribute('stroke', '#fff'); rect.setAttribute('stroke-width', '1.5');
rect.setAttribute('opacity', '0.9');
rect.setAttribute('cursor', 'pointer');
rect.addEventListener('click', function() {
if (window.ReactNativeWebView) {
window.ReactNativeWebView.postMessage(JSON.stringify({ type: 'roomTap', room: room }));
}
});
g.appendChild(rect);
var icon = document.createElementNS(SVG_NS, 'text');
icon.setAttribute('x', x.toString());
icon.setAttribute('y', (y + 4).toString());
icon.setAttribute('text-anchor', 'middle');
icon.setAttribute('font-size', '12'); icon.setAttribute('font-weight', 'bold');
icon.setAttribute('fill', '#fff');
icon.setAttribute('style', 'pointer-events: none;');
icon.textContent = 'R';
g.appendChild(icon);
var label = document.createElementNS(SVG_NS, 'text');
label.setAttribute('x', x.toString());
label.setAttribute('y', (y + sz + 12).toString());
label.setAttribute('text-anchor', 'middle');
label.setAttribute('font-size', '9'); label.setAttribute('font-weight', '700');
label.setAttribute('fill', '#333');
label.setAttribute('stroke', '#fff'); label.setAttribute('stroke-width', '2');
label.setAttribute('paint-order', 'stroke');
label.setAttribute('style', 'pointer-events: none;');
label.textContent = room.id;
g.appendChild(label);
});
svg.appendChild(g);
} catch(e) {
console.error('Error showing room markers:', e);
}
};
window.hideRoomMarkers = function() {
try {
var g = svg.querySelector('#roomMarkersGroup');
if (g && g.parentNode) g.parentNode.removeChild(g);
} catch(e) {}
};
// POI icon config per type
var POI_ICONS = {
'elevator': { bg: '#FFC107', letter: 'E', color: '#000' },
'stairs': { bg: '#4CAF50', letter: 'S', color: '#fff' },
'stairs-down': { bg: '#388E3C', letter: '↓', color: '#fff' },
'stairs-up': { bg: '#66BB6A', letter: '↑', color: '#fff' },
'emergency-exit': { bg: '#F44336', letter: '!', color: '#fff' },
'bathroom-men': { bg: '#2196F3', letter: 'M', color: '#fff' },
'bathroom-women': { bg: '#E91E63', letter: 'W', color: '#fff' },
'water-fountain': { bg: '#00BCD4', letter: '💧', color: '#fff' },
'computer-station':{ bg: '#9C27B0', letter: 'C', color: '#fff' },
'study-area': { bg: '#FF9800', letter: 'A', color: '#fff' },
'printer': { bg: '#607D8B', letter: 'P', color: '#fff' },
'bookshelf': { bg: '#795548', letter: 'B', color: '#fff' },
'entrance-exit': { bg: '#FF5722', letter: 'D', color: '#fff' },
'exit': { bg: '#FF5722', letter: 'D', color: '#fff' }
};
window.showPois = function(pois) {
try {
if (!pois || pois.length === 0) return;
window.hidePois();
var g = document.createElementNS(SVG_NS, 'g');
g.id = 'poisGroup';
pois.forEach(function(poi) {
var x = poi.x, y = poi.y;
if (isNaN(x) || isNaN(y)) return;
var icon = POI_ICONS[poi.type] || { bg: '#888', letter: '?', color: '#fff' };
var sz = 14;
var rect = document.createElementNS(SVG_NS, 'rect');
rect.setAttribute('x', (x - sz).toString());
rect.setAttribute('y', (y - sz).toString());
rect.setAttribute('width', (sz * 2).toString());
rect.setAttribute('height', (sz * 2).toString());
rect.setAttribute('rx', '4'); rect.setAttribute('ry', '4');
rect.setAttribute('fill', icon.bg);
rect.setAttribute('stroke', '#fff'); rect.setAttribute('stroke-width', '2');
rect.setAttribute('opacity', '0.95');
rect.setAttribute('cursor', 'pointer');
rect.addEventListener('click', function() {
if (window.ReactNativeWebView) {
window.ReactNativeWebView.postMessage(JSON.stringify({ type: 'poiTap', poi: poi }));
}
});
g.appendChild(rect);
var txt = document.createElementNS(SVG_NS, 'text');
txt.setAttribute('x', x.toString());
txt.setAttribute('y', (y + 5).toString());
txt.setAttribute('text-anchor', 'middle');
txt.setAttribute('font-size', '16'); txt.setAttribute('font-weight', 'bold');
txt.setAttribute('fill', icon.color);
txt.setAttribute('style', 'pointer-events: none;');
txt.textContent = icon.letter;
g.appendChild(txt);
var label = document.createElementNS(SVG_NS, 'text');
label.setAttribute('x', x.toString());
label.setAttribute('y', (y + sz + 14).toString());
label.setAttribute('text-anchor', 'middle');
label.setAttribute('font-size', '10'); label.setAttribute('font-weight', '600');
label.setAttribute('fill', '#333');
label.setAttribute('style', 'pointer-events: none;');
label.textContent = poi.displayName || poi.type;
g.appendChild(label);
});
svg.appendChild(g);
} catch(e) {
console.error('Error showing POIs:', e);
}
};
window.hidePois = function() {
try {
var g = svg.querySelector('#poisGroup');
if (g && g.parentNode) g.parentNode.removeChild(g);
} catch(e) {}
};
if (window.ReactNativeWebView) {
window.ReactNativeWebView.postMessage(JSON.stringify({ type: 'webViewReady' }));
}
})();
</script>
</body>
</html>
`;
Iif (cancelled || version !== floorVersionRef.current) return;
setSvgHtml(html);
markWebViewReady(false);
}
} catch (error) {
console.error("Error loading SVG:", getErrorMessage(error));
}
};
loadSvg();
return () => {
cancelled = true;
};
}, [buildingId, floorNumber, backgroundColor, invertSvg, markWebViewReady]);
const executeDrawRoute = React.useCallback(
(routePoints: RoutePoint[], version: number, retryCount = 0) => {
Iif (version !== floorVersionRef.current) return;
if (!loadedFloorRef.current) return;
Iif (!webViewRef.current) {
if (retryCount < 3) {
setTimeout(
() => executeDrawRoute(routePoints, version, retryCount + 1),
500,
);
}
return;
}
Iif (!isWebViewReadyRef.current) {
pendingRouteRef.current = routePoints;
return;
}
if (!routePoints || routePoints.length === 0) return;
const pointsJson = JSON.stringify(routePoints);
webViewRef.current.injectJavaScript(`
(function() {
if (typeof window.drawRouteFromPoints === 'function') {
try {
var result = window.drawRouteFromPoints(${pointsJson});
if (window.ReactNativeWebView) {
window.ReactNativeWebView.postMessage(JSON.stringify({
type: 'routeDrawn', success: result, pointCount: ${routePoints.length}
}));
}
} catch (e) {
console.error('Error in drawRouteFromPoints:', e);
}
}
true;
})();
`);
},
[],
);
React.useEffect(() => {
if (isWebViewReady && loadedFloorRef.current === floorNumber) {
const version = floorVersionRef.current;
Iif (pendingRouteRef.current) {
const pendingRoute = pendingRouteRef.current;
pendingRouteRef.current = null;
setTimeout(() => {
if (
version === floorVersionRef.current &&
isWebViewReadyRef.current
)
executeDrawRoute(pendingRoute, version, 0);
}, 300);
} else if (propRoutePoints && propRoutePoints.length > 0) {
setTimeout(() => {
if (
version === floorVersionRef.current &&
isWebViewReadyRef.current
)
executeDrawRoute(propRoutePoints, version, 0);
}, 300);
}
}
}, [isWebViewReady, propRoutePoints, executeDrawRoute, floorNumber]);
React.useEffect(() => {
if (!isWebViewReady || !webViewRef.current) return;
if (roomData && roomData.length > 0) {
const roomsJson = JSON.stringify(roomData);
setTimeout(() => {
webViewRef.current?.injectJavaScript(`
(function() {
try { if (typeof window.showRoomMarkers === 'function') window.showRoomMarkers(${roomsJson}); }
catch(e) { console.error('Error auto-showing rooms:', e); }
true;
})();
`);
}, 300);
}
}, [isWebViewReady, roomData]);
React.useEffect(() => {
if (!isWebViewReady || !webViewRef.current) return;
if (poiData && poiData.length > 0) {
const poisJson = JSON.stringify(poiData);
setTimeout(() => {
webViewRef.current?.injectJavaScript(`
(function() {
try { if (typeof window.showPois === 'function') window.showPois(${poisJson}); }
catch(e) { console.error('Error auto-showing POIs:', e); }
true;
})();
`);
}, 400);
} else {
webViewRef.current?.injectJavaScript(`
(function() {
if (typeof window.hidePois === 'function') window.hidePois();
true;
})();
`);
}
}, [isWebViewReady, poiData]);
useImperativeHandle(
ref,
() => ({
drawRoute: (routePoints: RoutePoint[]) => {
executeDrawRoute(routePoints, floorVersionRef.current);
},
clearRoute: () => {
Iif (!webViewRef.current) return;
webViewRef.current.injectJavaScript(`
(function() { if (window.clearRoute) window.clearRoute(); true; })();
`);
},
showRoomMarkers: (
roomPoints: Array<{ x: number; y: number; id: string }>,
) => {
if (!webViewRef.current || !roomPoints || roomPoints.length === 0)
return;
const roomPointsJson = JSON.stringify(roomPoints);
webViewRef.current.injectJavaScript(`
(function() {
try { if (typeof window.showRoomMarkers === 'function') window.showRoomMarkers(${roomPointsJson}); }
catch(e) { console.error('Error in showRoomMarkers:', e); }
true;
})();
`);
},
hideRoomMarkers: () => {
Iif (!webViewRef.current) return;
webViewRef.current.injectJavaScript(`
(function() { if (typeof window.hideRoomMarkers === 'function') window.hideRoomMarkers(); true; })();
`);
},
showPois: (pois: PoiMarker[]) => {
Iif (!webViewRef.current || !isWebViewReady) return;
const poisJson = JSON.stringify(pois);
webViewRef.current.injectJavaScript(`
(function() {
try { if (typeof window.showPois === 'function') window.showPois(${poisJson}); }
catch(e) { console.error('Error in showPois:', e); }
true;
})();
`);
},
hidePois: () => {
Iif (!webViewRef.current) return;
webViewRef.current.injectJavaScript(`
(function() { if (typeof window.hidePois === 'function') window.hidePois(); true; })();
`);
},
}),
[isWebViewReady],
);
const bgColor = backgroundColor ?? "white";
if (!svgHtml) {
return (
<View style={[styles.loadingContainer, { backgroundColor: bgColor }]}>
<ActivityIndicator size="large" color="#4285F4" />
<Text style={styles.loadingText}>Loading floor plan...</Text>
</View>
);
}
return (
<View style={styles.container}>
<WebView
key={`${buildingId}-${floorNumber}`}
ref={webViewRef}
source={{ html: svgHtml }}
style={[styles.webView, { backgroundColor: bgColor }]}
scalesPageToFit={true}
bounces={true}
scrollEnabled={true}
javaScriptEnabled={true}
onMessage={(event) => {
try {
const data = JSON.parse(event.nativeEvent.data);
if (data.type === "webViewReady") {
markWebViewReady(true, floorNumber);
Iif (pendingRouteRef.current) {
const pendingRoute = pendingRouteRef.current;
const version = floorVersionRef.current;
pendingRouteRef.current = null;
setTimeout(
() => executeDrawRoute(pendingRoute, version, 0),
100,
);
}
} else if (data.type === "poiTap" && onPoiTap && data.poi) {
onPoiTap(data.poi as PoiMarker);
} else if (data.type === "roomTap" && onRoomTap && data.room) {
onRoomTap(data.room as RoomMarkerData);
} else if (data.type === "routeDrawError") {
console.error("Route draw error:", data.message);
}
} catch (error) {
console.error(
"Failed to parse WebView message:",
getErrorMessage(error),
);
}
}}
onError={(syntheticEvent) => {
console.error("WebView error:", syntheticEvent.nativeEvent);
}}
onLoadEnd={() => {
setTimeout(() => {
Eif (!isWebViewReadyRef.current) {
markWebViewReady(true, floorNumber);
Iif (pendingRouteRef.current) {
const pendingRoute = pendingRouteRef.current;
const version = floorVersionRef.current;
pendingRouteRef.current = null;
setTimeout(
() => executeDrawRoute(pendingRoute, version, 0),
100,
);
}
}
}, 500);
}}
/>
</View>
);
},
);
const styles = StyleSheet.create({
container: {
flex: 1,
},
webView: {
flex: 1,
backgroundColor: "#FFFFFF",
},
loadingContainer: {
flex: 1,
justifyContent: "center",
alignItems: "center",
},
loadingText: {
marginTop: 12,
fontSize: 16,
color: "#757575",
},
});
export default FloorPlanWebView;
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