Allow reordering of post images

CHDataManagement/Views/Posts/PostImageGalleryView.swift

@@ -14,9 +14,9 @@ private struct NavigationIcon: View {
             .padding(5)
             .padding(edge, 2)
             .fontWeight(.light)
-            .foregroundStyle(.white)
+            .foregroundStyle(Color.white.opacity(0.8))
             .frame(width: 30, height: 30)
-            .background(Color.black.opacity(0.6).clipShape(Circle()))
+            .background(Color.black.opacity(0.7).clipShape(Circle()))
     }
 }
 
@@ -49,14 +49,18 @@ struct PostImageGalleryView: View {
                         .padding(.bottom, 10)
                     }
                 }
-                Button(action: { showImagePicker = true }) {
+                HStack(spacing: 5) {
-                    Image(systemSymbol: .plusCircleFill)
+                    Button(action: shiftBack) {
-                        .resizable()
+                        NavigationIcon(symbol: .arrowTurnUpLeft, edge: .trailing)
-                        .renderingMode(.template)
-                        .foregroundStyle(.blue.opacity(0.7))
-                        .frame(width: 30, height: 30)
-                        .padding()
                     }
+                    Button(action: shiftForward) {
+                        NavigationIcon(symbol: .arrowTurnUpRight, edge: .leading)
+                    }
+                    Spacer()
+                    Button(action: { showImagePicker = true }) {
+                        NavigationIcon(symbol: .plus, edge: .all)
+                    }
+                }.padding()
             }
             .buttonStyle(.plain)
             .foregroundStyle(.blue)
@@ -100,6 +104,22 @@ struct PostImageGalleryView: View {
             currentIndex = 0
         }
     }
+
+    private func shiftBack() {
+        guard currentIndex > 0 else {
+            return
+        }
+        post.images.swapAt(currentIndex, currentIndex-1)
+        currentIndex -= 1
+    }
+
+    private func shiftForward() {
+        guard currentIndex < post.images.count - 1 else {
+            return
+        }
+        post.images.swapAt(currentIndex, currentIndex+1)
+        currentIndex += 1
+    }
 }
 
 #Preview(traits: .fixedLayout(width: 300, height: 250)) {