Metrics: Expose basic details of each window key/value state storage.

docs/CHANGELOG.txt

@@ -72,6 +72,7 @@ Other Changes:
 - Docs: Improved and moved FAQ to docs/FAQ.md so it can be readable on the web. [@ButternCream, @ocornut]
 - Docs: Added permanent redirect from https://www.dearimgui.org/faq to FAQ page.
 - Demo: Added simple item reordering demo in Widgets -> Drag and Drop section. (#2823, #143) [@rokups]
+- Metrics: Expose basic details of each window key/value state storage.
 - Examples: DX12: Using IDXGIDebug1::ReportLiveObjects() when DX12_ENABLE_DEBUG_LAYER is enabled.
 - Examples: Emscripten: Removed NO_FILESYSTEM from Makefile, seems to fail on some setup. (#2734) [@Funto]
 - Backends: OpenGL3: Fix building with pre-3.2 GL loaders which do not expose glDrawElementsBaseVertex(),

imgui.cpp

@@ -9762,7 +9762,7 @@ void ImGui::ShowMetricsWindow(bool* p_open)
                     NodeColumns(&window->ColumnsStorage[n]);
                 ImGui::TreePop();
             }
-            ImGui::BulletText("Storage: %d bytes", window->StateStorage.Data.size_in_bytes());
+            NodeStorage(&window->StateStorage, "Storage");
             ImGui::TreePop();
         }
 
@@ -9787,6 +9787,18 @@ void ImGui::ShowMetricsWindow(bool* p_open)
                 ImGui::TreePop();
             }
         }
+
+        static void NodeStorage(ImGuiStorage* storage, const char* label)
+        {
+            if (!ImGui::TreeNode(label, "%s: %d entries, %d bytes", label, storage->Data.Size, storage->Data.size_in_bytes()))
+                return;
+            for (int n = 0; n < storage->Data.Size; n++)
+            {
+                const ImGuiStorage::ImGuiStoragePair& p = storage->Data[n];
+                ImGui::BulletText("Key 0x%08X Value { i: %d }", p.key, p.val_i); // Important: we currently don't store a type, real value may not be integer.
+            }
+            ImGui::TreePop();
+        }
     };
 
     Funcs::NodeWindows(g.Windows, "Windows");