Add ui::impl::renderer

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

@@ -2,6 +2,7 @@
 
 #include <psemek/ui/impl/size_constraints.hpp>
 #include <psemek/ui/impl/events.hpp>
+#include <psemek/ui/impl/renderer.hpp>
 #include <psemek/react/value.hpp>
 #include <psemek/geom/box.hpp>
 #include <psemek/geom/interval.hpp>
@@ -27,6 +28,9 @@ namespace psemek::ui::impl
 		virtual bool on_event(mouse_button_event const &) { return false; }
 		virtual bool on_event(key_event const &) { return false; }
 
+		virtual void      draw(renderer &) {}
+		virtual void post_draw(renderer &) {}
+
 		virtual ~component() {}
 
 	private:

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

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <psemek/ui/impl/component_factory.hpp>
+#include <psemek/ui/impl/renderer.hpp>
 #include <psemek/react/value.hpp>
 #include <psemek/util/pimpl.hpp>
 
@@ -16,12 +17,16 @@ namespace psemek::ui::impl
 
 		void set_ui(react::value<std::any> ui);
 
+		component * root();
+
 		bool on_event(resize_event const & event);
 		bool on_event(mouse_move_event const & event);
 		bool on_event(mouse_wheel_event const & event);
 		bool on_event(mouse_button_event const & event);
 		bool on_event(key_event const & event);
 
+		void draw(renderer & renderer);
+
 	private:
 		psemek_declare_pimpl
 	};

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

@@ -0,0 +1,11 @@
+#pragma once
+
+namespace psemek::ui::impl
+{
+
+	struct renderer
+	{
+		virtual ~renderer() {}
+	};
+
+}

libs/ui/source/impl/controller.cpp

@@ -24,7 +24,8 @@ namespace psemek::ui::impl
 				root = factory.reconciliate(std::move(root), value);
 				subscribe_reshape();
 			}, true);
-			subscribe_reshape();
+
+			on_event(resize_event{screen_size});
 		}
 
 		void subscribe_reshape()
@@ -70,6 +71,24 @@ namespace psemek::ui::impl
 
 			return element->on_event(event);
 		}
+
+		void draw(renderer & renderer)
+		{
+			draw_impl(renderer, root.get());
+		}
+
+		void draw_impl(renderer & renderer, component * element)
+		{
+			if (!element)
+				return;
+
+			element->draw(renderer);
+
+			for (auto const & child : element->children())
+				draw_impl(renderer, child.get());
+
+			element->post_draw(renderer);
+		}
 	};
 
 	controller::controller(component_factory & factory)
@@ -83,6 +102,11 @@ namespace psemek::ui::impl
 		impl().set_ui(std::move(ui));
 	}
 
+	component * controller::root()
+	{
+		return impl().root.get();
+	}
+
 	bool controller::on_event(resize_event const & event)
 	{
 		return impl().on_event(event);
@@ -108,4 +132,9 @@ namespace psemek::ui::impl
 		return impl().on_event(event);
 	}
 
+	void controller::draw(renderer & renderer)
+	{
+		impl().draw(renderer);
+	}
+
 }