Обновлен и вынесен в отдельный модуль абстрактный класс базового экрана.

source/ncui/engine/basescreen.d

@@ -0,0 +1,108 @@
+module ncui.engine.basescreen;
+
+import ncui.core.ncwin;
+import ncui.core.window;
+import ncui.core.event;
+import ncui.engine.screen;
+import ncui.engine.action;
+import ncui.widgets.container;
+
+abstract class ScreenBase : IScreen
+{
+protected:
+	Window _window;
+	WidgetContainer _ui;
+	bool _built;
+
+	void ensureWindow(ScreenContext context);
+	void build(ScreenContext context, Window window, WidgetContainer ui);
+	void layout(ScreenContext ctx, Window w, WidgetContainer ui)
+	{
+	}
+
+	ScreenAction handleGlobal(ScreenContext context, KeyEvent event)
+	{
+		return ScreenAction.none();
+	}
+
+private:
+	void renderAll(ScreenContext context)
+	{
+		import deimos.ncurses : doupdate;
+		import ncui.lib.checks;
+
+		_window.erase();
+		layout(context, _window, _ui);
+		_ui.render(_window, context);
+		_window.noutrefresh();
+
+		ncuiNotErr!doupdate();
+	}
+
+public:
+	this()
+	{
+		_ui = new WidgetContainer();
+	}
+
+	override NCWin inputWindow()
+	{
+		return _window.handle();
+	}
+
+	override ScreenAction onShow(ScreenContext context)
+	{
+		if (_window !is null)
+		{
+			_window.close();
+		}
+
+		ensureWindow(context);
+
+		if (!_built)
+		{
+			build(context, _window, _ui);
+			_built = true;
+		}
+
+		renderAll(context);
+		return ScreenAction.none();
+	}
+
+	override ScreenAction onChildResult(ScreenContext context, ScreenResult child)
+	{
+		return ScreenAction.none();
+	}
+
+	override ScreenAction handle(ScreenContext context, KeyEvent event)
+	{
+		auto result = handleGlobal(context, event);
+
+		if (result.kind != ActionKind.None)
+		{
+			return result;
+		}
+
+		auto action = _ui.handle(context, event);
+
+		if (action.kind != ActionKind.None)
+		{
+			return action;
+		}
+
+		renderAll(context);
+		return ScreenAction.none();
+	}
+
+	override void close()
+	{
+		if (_window !is null)
+		{
+			_window.close();
+		}
+
+		_window = null;
+		_built = false;
+		_ui = new WidgetContainer();
+	}
+}

source/ncui/engine/screen.d

@@ -56,37 +56,3 @@ interface ITaggedScreen
 {
 	int tag();
 }
-
-abstract class ScreenBase : IScreen
-{
-protected:
-	Window _window;
-
-public:
-	override NCWin inputWindow()
-	{
-		return _window.handle();
-	}
-
-	override ScreenAction onShow(ScreenContext context)
-	{
-		return ScreenAction.none();
-	}
-
-	override ScreenAction onChildResult(ScreenContext context, ScreenResult child)
-	{
-		return ScreenAction.none();
-	}
-
-	override ScreenAction handle(ScreenContext context, KeyEvent event)
-	{
-		return ScreenAction.none();
-	}
-
-	override void close()
-	{
-		if (_window !is null)
-			_window.close();
-		_window = null;
-	}
-}

source/ncui/package.d

@@ -10,6 +10,7 @@ public import ncui.core.window;
 public import ncui.engine.ncui;
 public import ncui.engine.action;
 public import ncui.engine.screen;
+public import ncui.engine.basescreen;
 
 // Вспомогательная библиотека
 public import ncui.lib.logger;