Step 84: native file dialogs

editor/src/FileDialog.h

@@ -0,0 +1,67 @@
+#pragma once
+// Step 84: Native file dialogs wrapper
+//
+// Provides a small abstraction over native file dialogs (tinyfiledialogs)
+// with an injectable provider for tests.
+
+#include <string>
+#include <vector>
+#include <functional>
+
+class FileDialog {
+public:
+    struct OpenRequest {
+        std::string title;
+        std::vector<std::string> filters;
+        std::string defaultPath;
+    };
+
+    struct SaveRequest {
+        std::string title;
+        std::vector<std::string> filters;
+        std::string defaultPath;
+    };
+
+    struct FolderRequest {
+        std::string title;
+        std::string defaultPath;
+    };
+
+    using OpenFn = std::function<std::string(const OpenRequest&)>;
+    using SaveFn = std::function<std::string(const SaveRequest&)>;
+    using FolderFn = std::function<std::string(const FolderRequest&)>;
+
+    struct Provider {
+        OpenFn openFile;
+        SaveFn saveFile;
+        FolderFn openFolder;
+    };
+
+    static void setProvider(const Provider& provider) { provider_() = provider; }
+    static void clearProvider() { provider_() = Provider{}; }
+
+    static std::string openFile(const OpenRequest& req) {
+        if (provider_().openFile) return provider_().openFile(req);
+        return openFileNative(req);
+    }
+
+    static std::string saveFile(const SaveRequest& req) {
+        if (provider_().saveFile) return provider_().saveFile(req);
+        return saveFileNative(req);
+    }
+
+    static std::string openFolder(const FolderRequest& req) {
+        if (provider_().openFolder) return provider_().openFolder(req);
+        return openFolderNative(req);
+    }
+
+private:
+    static Provider& provider_() {
+        static Provider p{};
+        return p;
+    }
+
+    static std::string openFileNative(const OpenRequest& req);
+    static std::string saveFileNative(const SaveRequest& req);
+    static std::string openFolderNative(const FolderRequest& req);
+};