Support ui component-specific cursors specified by a string id

libs/ui/include/psemek/ui/impl/component.hpp

@@ -9,6 +9,8 @@
 #include <psemek/util/span.hpp>
 
 #include <memory>
+#include <string>
+#include <optional>
 
 namespace psemek::ui::impl
 {
@@ -33,6 +35,8 @@ namespace psemek::ui::impl
 		virtual void      draw(renderer &) {}
 		virtual void post_draw(renderer &) {}
 
+		virtual std::optional<std::string> cursor() const { return std::nullopt; }
+
 		virtual ~component() {}
 
 	private:

libs/ui/include/psemek/ui/impl/controller.hpp

@@ -2,6 +2,7 @@
 
 #include <psemek/ui/impl/component_factory.hpp>
 #include <psemek/ui/impl/renderer.hpp>
+#include <psemek/ui/impl/event_state.hpp>
 #include <psemek/react/value.hpp>
 #include <psemek/util/pimpl.hpp>
 
@@ -25,9 +26,13 @@ namespace psemek::ui::impl
 		bool on_event(mouse_button_event const & event);
 		bool on_event(key_event const & event);
 
+		event_state const & state();
+
 		void update(float dt);
 		void draw(renderer & renderer);
 
+		std::optional<std::string> cursor();
+
 	private:
 		psemek_declare_pimpl
 	};

libs/ui/source/impl/controller.cpp

@@ -90,6 +90,23 @@ namespace psemek::ui::impl
 
 			element->post_draw(renderer);
 		}
+
+		std::optional<std::string> cursor()
+		{
+			return cursor_impl(root.get());
+		}
+
+		std::optional<std::string> cursor_impl(component * element)
+		{
+			if (!element)
+				return std::nullopt;
+
+			for (auto const & child : util::reversed(element->children()))
+				if (auto cursor = cursor_impl(child.get()))
+					return cursor;
+
+			return element->cursor();
+		}
 	};
 
 	controller::controller(component_factory & factory)
@@ -133,6 +150,11 @@ namespace psemek::ui::impl
 		return impl().on_event(event);
 	}
 
+	event_state const & controller::state()
+	{
+		return impl().state;
+	}
+
 	void controller::update(float dt)
 	{
 		impl().update(dt);
@@ -143,4 +165,9 @@ namespace psemek::ui::impl
 		impl().draw(renderer);
 	}
 
+	std::optional<std::string> controller::cursor()
+	{
+		return impl().cursor();
+	}
+
 }