Add XCUI expansion state and coverage tests

engine/CMakeLists.txt

@@ -521,8 +521,10 @@ add_library(XCEngine STATIC
     ${CMAKE_CURRENT_SOURCE_DIR}/src/UI/Text/UITextEditing.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/src/UI/Text/UITextInputController.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/UI/Widgets/UIEditorCollectionPrimitives.h
+    ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/UI/Widgets/UIExpansionModel.h
     ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/UI/Widgets/UISelectionModel.h
     ${CMAKE_CURRENT_SOURCE_DIR}/src/UI/Widgets/UIEditorCollectionPrimitives.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/UI/Widgets/UIExpansionModel.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/src/UI/Widgets/UISelectionModel.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/UI/Runtime/UIScreenTypes.h
     ${CMAKE_CURRENT_SOURCE_DIR}/include/XCEngine/UI/Runtime/UIScreenDocumentHost.h

engine/include/XCEngine/UI/Widgets/UIExpansionModel.h

@@ -0,0 +1,30 @@
+#pragma once
+
+#include <cstddef>
+#include <string>
+#include <string_view>
+#include <unordered_set>
+
+namespace XCEngine {
+namespace UI {
+namespace Widgets {
+
+class UIExpansionModel {
+public:
+    bool HasExpandedItems() const;
+    std::size_t GetExpandedCount() const;
+    bool IsExpanded(std::string_view id) const;
+
+    bool SetExpanded(std::string itemId, bool expanded);
+    bool Expand(std::string itemId);
+    bool Collapse(std::string itemId);
+    bool ToggleExpanded(std::string itemId);
+    bool Clear();
+
+private:
+    std::unordered_set<std::string> m_expandedIds = {};
+};
+
+} // namespace Widgets
+} // namespace UI
+} // namespace XCEngine

engine/src/UI/Widgets/UIEditorCollectionPrimitives.cpp

@@ -64,6 +64,7 @@ bool UsesUIEditorCollectionPrimitiveColumnLayout(UIEditorCollectionPrimitiveKind
 bool IsUIEditorCollectionPrimitiveHoverable(UIEditorCollectionPrimitiveKind kind) {
     return kind == UIEditorCollectionPrimitiveKind::TreeItem ||
         kind == UIEditorCollectionPrimitiveKind::ListItem ||
+        kind == UIEditorCollectionPrimitiveKind::PropertySection ||
         kind == UIEditorCollectionPrimitiveKind::FieldRow;
 }
 

engine/src/UI/Widgets/UIExpansionModel.cpp

@@ -0,0 +1,57 @@
+#include <XCEngine/UI/Widgets/UIExpansionModel.h>
+
+#include <utility>
+
+namespace XCEngine {
+namespace UI {
+namespace Widgets {
+
+bool UIExpansionModel::HasExpandedItems() const {
+    return !m_expandedIds.empty();
+}
+
+std::size_t UIExpansionModel::GetExpandedCount() const {
+    return m_expandedIds.size();
+}
+
+bool UIExpansionModel::IsExpanded(std::string_view id) const {
+    return m_expandedIds.contains(std::string(id));
+}
+
+bool UIExpansionModel::SetExpanded(std::string itemId, bool expanded) {
+    return expanded
+        ? Expand(std::move(itemId))
+        : Collapse(std::move(itemId));
+}
+
+bool UIExpansionModel::Expand(std::string itemId) {
+    return m_expandedIds.insert(std::move(itemId)).second;
+}
+
+bool UIExpansionModel::Collapse(std::string itemId) {
+    return m_expandedIds.erase(itemId) > 0u;
+}
+
+bool UIExpansionModel::ToggleExpanded(std::string itemId) {
+    const auto it = m_expandedIds.find(itemId);
+    if (it != m_expandedIds.end()) {
+        m_expandedIds.erase(it);
+        return true;
+    }
+
+    m_expandedIds.insert(std::move(itemId));
+    return true;
+}
+
+bool UIExpansionModel::Clear() {
+    if (m_expandedIds.empty()) {
+        return false;
+    }
+
+    m_expandedIds.clear();
+    return true;
+}
+
+} // namespace Widgets
+} // namespace UI
+} // namespace XCEngine