Editor: Ensure CreateItemAction is not activated fom invalid state, thanks @pthom

Author: thedmd

docs/CHANGELOG.txt

@@ -20,6 +20,8 @@ v0.9.2 (WIP):
 
     CHANGE: Editor: Unary operator- for ImVec2 is defined by ImGui since r18955 (#248)
 
+    CHANGE: Editor: Ensure CreateItemAction is not activated fom invalid state, thanks @pthom
+
     BUGFIX: Editor: Correctly initialize 'width' for view resize code (thx @gnif)
 
     BUGFIX: Examples: Handle node deletion before links (#182)
@@ -45,6 +47,8 @@ v0.9.2 (WIP):
 
     BUGFIX: Editor: Don't call Canvas.End() when Canvas.Begin() failed (#186), thanks @pthom, @TheZoc
 
+    BUGFIX: Examples: Call ed::EndCreate() and ed::EndDelete() only when ed::BeginCreate() and ed::BeginDelete() returned true
+
 
 v0.9.1 (2022-08-27):
 

examples/basic-interaction-example/basic-interaction-example.cpp

@@ -153,8 +153,8 @@ struct Example:
                     // visual feedback by changing link thickness and color.
                 }
             }
+            ed::EndCreate(); // Wraps up object creation action handling.
         }
-        ed::EndCreate(); // Wraps up object creation action handling.
 
 
         // Handle deletion action
@@ -181,9 +181,8 @@ struct Example:
                 // You may reject link deletion by calling:
                 // ed::RejectDeletedItem();
             }
+            ed::EndDelete(); // Wrap up deletion action
         }
-        ed::EndDelete(); // Wrap up deletion action
-
 
 
         // End of interaction with editor.

examples/blueprints-example/blueprints-example.cpp

@@ -1543,12 +1543,12 @@ struct Example:
                             ed::Resume();
                         }
                     }
+
+                    ed::EndCreate();
                 }
                 else
                     newLinkPin = nullptr;
 
-                ed::EndCreate();
-
                 if (ed::BeginDelete())
                 {
                     ed::NodeId nodeId = 0;
@@ -1572,8 +1572,9 @@ struct Example:
                                 m_Links.erase(id);
                         }
                     }
+
+                    ed::EndDelete();
                 }
-                ed::EndDelete();
             }
 
             ImGui::SetCursorScreenPos(cursorTopLeft);

examples/widgets-example/widgets-example.cpp

@@ -384,8 +384,8 @@ struct Example:
                         }
                     }
                 }
+                ed::EndCreate();
             }
-            ed::EndCreate();
 
             // Handle deletion action ---------------------------------------------------------------------------
             if (ed::BeginDelete())
@@ -405,8 +405,8 @@ struct Example:
                         }
                     }
                 }
+                ed::EndDelete();
             }
-            ed::EndDelete();
 
         ed::End();
         ed::SetCurrentEditor(nullptr);

imgui_node_editor.cpp

@@ -4709,23 +4709,23 @@ bool ed::CreateItemAction::Begin()
 {
     IM_ASSERT(false == m_InActive);
 
+    if (m_NextStage == None)
+        return false;
+
     m_InActive        = true;
     m_CurrentStage    = m_NextStage;
     m_UserAction      = Unknown;
     m_LinkColor       = IM_COL32_WHITE;
     m_LinkThickness   = 1.0f;
 
-    if (m_CurrentStage == None)
-        return false;
-
     m_LastChannel = Editor->GetDrawList()->_Splitter._Current;
 
     return true;
 }
 
 void ed::CreateItemAction::End()
 {
-    IM_ASSERT(m_InActive);
+    IM_ASSERT(m_InActive && "Please call End() only when Begin() was successful");
 
     if (m_IsInGlobalSpace)
     {