WIP: loading indicator

frontend/lib/modules/current_trip_loading_indicator.dart

@@ -34,29 +34,85 @@ Widget loadingText(Trip trip) => FutureBuilder(
     Widget greeter;
 
     if (snapshot.hasData) {
-      greeter = AutoSizeText(
-        maxLines: 1,
-        'Generating your trip to ${snapshot.data}...',
+      greeter = AnimatedGradientText(
+        text: 'Generating your trip to ${snapshot.data}...',
         style: greeterStyle,
       );
     } else if (snapshot.hasError) {
       // the exact error is shown in the central part of the trip overview. No need to show it here
-      greeter = AutoSizeText(
-        maxLines: 1,
-        'Error while loading trip.',
+      greeter = AnimatedGradientText(
+        text: 'Error while loading trip.',
         style: greeterStyle,
-        );
+      );
     } else {
-      greeter = AutoSizeText(
-        maxLines: 1,
-        'Generating your trip...',
+      greeter = AnimatedGradientText(
+        text: 'Generating your trip...',
         style: greeterStyle,
-        );
+      );
     }
     return greeter;
   }
 );
 
+class AnimatedGradientText extends StatefulWidget {
+  final String text;
+  final TextStyle style;
+
+  const AnimatedGradientText({
+    Key? key,
+    required this.text,
+    required this.style,
+  }) : super(key: key);
+
+  @override
+  _AnimatedGradientTextState createState() => _AnimatedGradientTextState();
+}
+
+class _AnimatedGradientTextState extends State<AnimatedGradientText> with SingleTickerProviderStateMixin {
+  late AnimationController _controller;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = AnimationController(
+      duration: const Duration(seconds: 1),
+      vsync: this,
+    )..repeat();
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AnimatedBuilder(
+      animation: _controller,
+      builder: (context, child) {
+        return ShaderMask(
+          shaderCallback: (bounds) {
+            return LinearGradient(
+              colors: [Colors.blue, Colors.red, Colors.blue],
+              stops: [
+                _controller.value - 1.0,
+                _controller.value,
+                _controller.value + 1.0,
+              ],
+              tileMode: TileMode.mirror,
+            ).createShader(bounds);
+          },
+          child: Text(
+            widget.text,
+            style: widget.style,
+          ),
+        );
+      },
+    );
+  }
+}
+
 
 
 

frontend/lib/structs/landmark.dart

@@ -125,7 +125,7 @@ class LandmarkType {
   LandmarkType({required this.name, this.icon = const Icon(Icons.location_on)}) {
     switch (name) {
       case 'sightseeing':
-        icon = const Icon(Icons.church);
+        icon = const Icon(Icons.castle);
         break;
       case 'nature':
         icon = const Icon(Icons.eco);