Fix performance and undo

[rbdr/map] / Map / Views / MapRender.swift

diff --git a/Map/Views/MapRender.swift b/Map/Views/MapRender.swift
index 7623b6179a7504c6c845c191f54cf08abbedce1e..aa97e22ab12a883a247a5a259b8dae64dce5a8c4 100644 (file)
--- a/Map/Views/MapRender.swift
+++ b/Map/Views/MapRender.swift
@@ -14,8 +14,10 @@ struct MapRenderView: View {
 
   @Environment(\.colorScheme) var colorScheme
 
-  var content: String
-  let evolution: Stage
+  @Binding var content: String
+  @Binding var evolution: Stage
+
+  @State var parsedMap: ParsedMap = ParsedMap.empty
 
   let mapSize = CGSize(width: 1300.0, height: 1000.0)
 
@@ -23,10 +25,6 @@ struct MapRenderView: View {
   let vertexSize = CGSize(width: 25.0, height: 25.0)
   let padding = CGFloat(30.0)
 
-  var parsedMap: ParsedMap {
-    return Map.parse(content: content)
-  }
-
   var body: some View {
     ZStack(alignment: .topLeading) {
 
@@ -50,13 +48,19 @@ struct MapRenderView: View {
     }.frame(
       width: mapSize.width,
       height: mapSize.height + 2 * padding, alignment: .topLeading
-    ).padding(padding)
+    ).onAppear {
+      self.parsedMap = Map.parse(content: content)
+    }.padding(padding).onChange(of: content) { newState in
+      self.parsedMap = Map.parse(content: newState)
+    }
   }
 }
 
 struct MapRenderView_Previews: PreviewProvider {
   static var previews: some View {
-    MapRenderView(content: "", evolution: Stage.stages(.general)).environment(
+    MapRenderView(
+      content: Binding.constant(""), evolution: Binding.constant(Stage.stages(.general))
+    ).environment(
       \.managedObjectContext, PersistenceController.preview.container.viewContext)
   }
 }