Advance new editor hosted panels and state flow

new_editor/app/Project/ProductProjectBrowserModel.h

@@ -0,0 +1,67 @@
+#pragma once
+
+#include <XCEditor/Collections/UIEditorTreeView.h>
+
+#include <XCEngine/UI/Types.h>
+
+#include <cstdint>
+#include <filesystem>
+#include <string>
+#include <string_view>
+#include <vector>
+
+namespace XCEngine::UI::Editor::App::Project {
+
+class ProductProjectBrowserModel {
+public:
+    struct BreadcrumbSegment {
+        std::string label = {};
+        std::string targetFolderId = {};
+        bool current = false;
+    };
+
+    struct FolderEntry {
+        std::string itemId = {};
+        std::filesystem::path absolutePath = {};
+        std::string label = {};
+    };
+
+    struct AssetEntry {
+        std::string itemId = {};
+        std::filesystem::path absolutePath = {};
+        std::string displayName = {};
+        bool directory = false;
+    };
+
+    void Initialize(const std::filesystem::path& repoRoot);
+    void SetFolderIcon(const ::XCEngine::UI::UITextureHandle& icon);
+    void Refresh();
+
+    bool Empty() const;
+    const std::filesystem::path& GetAssetsRootPath() const;
+    const std::vector<FolderEntry>& GetFolderEntries() const;
+    const std::vector<Widgets::UIEditorTreeViewItem>& GetTreeItems() const;
+    const std::vector<AssetEntry>& GetAssetEntries() const;
+    const std::string& GetCurrentFolderId() const;
+
+    const FolderEntry* FindFolderEntry(std::string_view itemId) const;
+    const AssetEntry* FindAssetEntry(std::string_view itemId) const;
+    bool NavigateToFolder(std::string_view itemId);
+    std::vector<BreadcrumbSegment> BuildBreadcrumbSegments() const;
+    std::vector<std::string> CollectCurrentFolderAncestorIds() const;
+    std::vector<std::string> BuildAncestorFolderIds(std::string_view itemId) const;
+
+private:
+    void RefreshFolderTree();
+    void RefreshAssetList();
+    void EnsureValidCurrentFolder();
+
+    std::filesystem::path m_assetsRootPath = {};
+    std::vector<FolderEntry> m_folderEntries = {};
+    std::vector<Widgets::UIEditorTreeViewItem> m_treeItems = {};
+    std::vector<AssetEntry> m_assetEntries = {};
+    ::XCEngine::UI::UITextureHandle m_folderIcon = {};
+    std::string m_currentFolderId = {};
+};
+
+} // namespace XCEngine::UI::Editor::App::Project