Simplify some things in ui container implementation.

packages/rendering/include/rendering/ui/UIContainer.h

@@ -56,10 +56,8 @@ namespace l::ui {
     };
 
     enum class UITraversalMode {
-        AllDFS = 0, // when a visitor performs an action on all containers of its type for example rendering (visiting leaves first)
-        AllBFS = 1, // when a visitor performs an action on all containers starting with the root (visiting leaves last)
-        Once = 2, // when a visitor performs an action on one container of its type for example resizing
-        Twice = 3, // when a visitor performs an action on two containers of its type for example drag and drop actions like connecting input/output between two containers
+        DFS = 0, // Depth first search, leaves first, root last
+        BFS = 1, // Breadth first search, root first, leaves last
     };
 
     struct UIRenderData {
@@ -270,8 +268,8 @@ namespace l::ui {
         }
         virtual ~UIContainer() = default;
 
-        bool Accept(UIVisitor& visitor, const InputState& input, UITraversalMode mode = UITraversalMode::AllBFS);
-        virtual bool Accept(UIVisitor& visitor, const InputState& input, const ContainerArea& contentArea, UITraversalMode mode = UITraversalMode::AllBFS);
+        bool Accept(UIVisitor& visitor, const InputState& input, UITraversalMode mode = UITraversalMode::BFS);
+        virtual bool Accept(UIVisitor& visitor, const InputState& input, const ContainerArea& contentArea, UITraversalMode mode = UITraversalMode::BFS);
         virtual void Add(UIContainer* container, int32_t i = -1);
 
         template<class T>

packages/rendering/source/common/ui/UIContainer.cpp

@@ -230,8 +230,10 @@ namespace l::ui {
             }
         }
 
-        if (mode == UITraversalMode::AllBFS && visitor.Active(*this, input)) {
-            visitor.Visit(*this, input, contentArea);
+        if (mode == UITraversalMode::BFS && visitor.Active(*this, input)) {
+            if (visitor.Visit(*this, input, contentArea)) {
+                return true;
+            }
         }
 
         size_t i = 0;
@@ -251,14 +253,12 @@ namespace l::ui {
             }
 
             if (content->Accept(visitor, input, mContentAreas.at(i), mode)) {
-                if (mode == UITraversalMode::Once) {
-                    return true;
-                }
+                return true;
             }
             i++;
         }
 
-        if ((mode == UITraversalMode::AllDFS || mode == UITraversalMode::Once || mode == UITraversalMode::Twice) && visitor.Active(*this, input)) {
+        if (mode == UITraversalMode::DFS && visitor.Active(*this, input)) {
             return visitor.Visit(*this, input, contentArea);
         }
         return false;
@@ -314,8 +314,10 @@ namespace l::ui {
             }
         }
 
-        if (mode == UITraversalMode::AllBFS && visitor.Active(*this, input)) {
-            visitor.Visit(*this, input, contentArea);
+        if (mode == UITraversalMode::BFS && visitor.Active(*this, input)) {
+            if (visitor.Visit(*this, input, contentArea)) {
+                return true;
+            }
         }
 
         size_t i = 0;
@@ -327,9 +329,7 @@ namespace l::ui {
             }
 
             if (content->Accept(visitor, input, mContentAreas.at(i), mode)) {
-                if (mode == UITraversalMode::Once) {
-                    return true;
-                }
+                return true;
             }
 
             if (visitor.ShouldUpdateContainer()) {
@@ -355,7 +355,7 @@ namespace l::ui {
             i++;
         }
 
-        if ((mode == UITraversalMode::AllDFS || mode == UITraversalMode::Once || mode == UITraversalMode::Twice) && visitor.Active(*this, input)) {
+        if ((mode == UITraversalMode::DFS) && visitor.Active(*this, input)) {
             return visitor.Visit(*this, input, contentArea);
         }
         return false;