basic plugin support

src/providerregistry.h

@@ -0,0 +1,59 @@
+#pragma once
+#include "iplugin.h"
+#include <QVector>
+#include <QString>
+#include <functional>
+
+// Forward declarations
+namespace rcx { class Provider; }
+class QWidget;
+
+/**
+ * Global registry for data source providers
+ * 
+ * Providers register themselves here so they can be listed in the Source picker.
+ * Supports both plugin-based providers and built-in providers.
+ */
+class ProviderRegistry {
+public:
+    // Factory function for creating built-in providers
+    using BuiltinFactory = std::function<bool(QWidget* parent, QString* target)>;
+    
+    struct ProviderInfo {
+        QString name;          // Display name (e.g., "Process Memory")
+        QString identifier;    // Unique ID (e.g., "process")
+        IProviderPlugin* plugin;  // Plugin (if plugin-based)
+        BuiltinFactory factory;   // Factory (if built-in)
+        bool isBuiltin;
+        
+        ProviderInfo(const QString& n, const QString& id, IProviderPlugin* p)
+            : name(n), identifier(id), plugin(p), factory(nullptr), isBuiltin(false) {}
+        
+        ProviderInfo(const QString& n, const QString& id, BuiltinFactory f)
+            : name(n), identifier(id), plugin(nullptr), factory(f), isBuiltin(true) {}
+    };
+    
+    static ProviderRegistry& instance();
+    
+    // Register a plugin-based provider
+    void registerProvider(const QString& name, const QString& identifier, IProviderPlugin* plugin);
+    
+    // Register a built-in provider with a factory function
+    void registerBuiltinProvider(const QString& name, const QString& identifier, BuiltinFactory factory);
+    
+    // Unregister a provider (called when unloading plugins)
+    void unregisterProvider(const QString& identifier);
+    
+    // Get all registered providers
+    const QVector<ProviderInfo>& providers() const { return m_providers; }
+    
+    // Find provider by identifier
+    const ProviderInfo* findProvider(const QString& identifier) const;
+    
+    // Clear all providers
+    void clear();
+    
+private:
+    ProviderRegistry() = default;
+    QVector<ProviderInfo> m_providers;
+};