Add generic ui::spawn

libs/ui/include/psemek/ui/spawn.hpp

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <psemek/ui/element.hpp>
+
+namespace psemek::ui
+{
+
+	bool spawn(element * root, std::shared_ptr<element> element, geom::point<float, 2> const & position);
+
+}

libs/ui/source/spawn.cpp

@@ -0,0 +1,68 @@
+#include <psemek/ui/spawn.hpp>
+#include <psemek/ui/event_interceptor.hpp>
+#include <psemek/ui/positioner.hpp>
+#include <psemek/ui/screen.hpp>
+
+namespace psemek::ui
+{
+
+	namespace
+	{
+
+		struct opaque_event_interceptor
+			: event_interceptor
+		{
+			bool transparent() const override { return false; }
+		};
+
+	}
+
+	bool spawn(element * root, std::shared_ptr<element> element, geom::point<float, 2> const & position)
+	{
+		ui::screen * screen = find_last_parent_of_type<struct screen>(root);
+		if (!screen)
+			return false;
+
+		auto event_interceptor = std::make_shared<opaque_event_interceptor>();
+		auto positioner = std::make_shared<struct positioner>();
+		positioner->set_child(element);
+		event_interceptor->set_child(positioner);
+
+		auto loop = screen->loop();
+
+		auto close = [root = event_interceptor.get()]{
+			auto p = dynamic_cast<struct screen *>(root->parent());
+			if (p)
+				p->remove_child(root);
+		};
+
+		event_interceptor->on_mouse_click([loop, close](ui::mouse_click const & e) -> bool {
+			if (e.down && (e.button == ui::mouse_button::right || e.button == ui::mouse_button::left))
+			{
+				loop->post(close);
+				return true;
+			}
+
+			return false;
+		});
+
+		event_interceptor->on_key_press([loop, close](key_press const & e) -> bool {
+			if (e.down && e.key == SDLK_ESCAPE)
+			{
+				loop->post(close);
+				return true;
+			}
+
+			return false;
+		});
+
+		event_interceptor->on_mouse_move([](mouse_move const &){ return true; });
+
+		send_fake_mouse_move_event(event_interceptor.get(), true);
+
+		positioner->set_position(position, positioner::x_align::left, positioner::y_align::top);
+		screen->add_child(event_interceptor, screen::x_policy::fill, screen::y_policy::fill);
+		return true;
+	}
+
+}