Fixed map blinking when swiping the bottom sheet (#88)

- Rewrote the route_details_screen with improved code logic.
- Enhanced handling of the bottom sheet to eliminate map blinking.

Signed-off-by: Mohan Sai Manthri <[email protected]>

lib/common/extensions/geo_box_extensions.dart

@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2020-2023 HERE Europe B.V.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * License-Filename: LICENSE
+ */
+
+import 'package:here_sdk/core.dart';
+
+extension GeoBoxExtensionsNullable on GeoBox {
+  bool get hasDiagonalLength => southWestCorner.distanceTo(northEastCorner) > 0;
+
+  GeoBox expandedByPercentage(double percentage) {
+    final double diagonalLength = southWestCorner.distanceTo(northEastCorner);
+    final double padding = hasDiagonalLength ? diagonalLength * percentage : percentage;
+    return expandedBy(padding, padding, padding, padding);
+  }
+}

lib/common/util.dart

@@ -178,6 +178,11 @@ extension Point2DExtensions on Point2D {
   Point2D operator /(double factor) => Point2D(x / factor, y / factor);
 }
 
+/// An extension for the [Size2D].
+extension Size2DExtensions on Size2D {
+  Size2D operator *(double factor) => Size2D(width * factor, height * factor);
+}
+
 /// Utility function that shows [SnackBar] with [errorMessage]
 void displayErrorSnackBar(BuildContext context, String errorMessage) {
   ScaffoldMessenger.of(context).showSnackBar(SnackBar(