Introduced Ui::Show interface.

CMakeLists.txt

@@ -86,6 +86,7 @@ PRIVATE
     ui/layers/layer_manager.h
     ui/layers/layer_widget.cpp
     ui/layers/layer_widget.h
+    ui/layers/show.h
     ui/paint/arcs.cpp
     ui/paint/arcs.h
     ui/paint/blob.cpp

ui/layers/show.h

@@ -0,0 +1,32 @@
+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include "ui/layers/layer_widget.h"
+
+namespace Ui {
+
+class BoxContent;
+
+class Show {
+public:
+	virtual ~Show() = 0;
+	virtual void showBox(
+		object_ptr<BoxContent> content,
+		LayerOptions options = LayerOption::KeepOther) const = 0;
+	virtual void hideLayer() const = 0;
+	[[nodiscard]] virtual not_null<QWidget*> toastParent() const = 0;
+	[[nodiscard]] virtual bool valid() const = 0;
+	virtual operator bool() const = 0;
+};
+
+inline Show::~Show() = default;
+
+using ShowPtr = std::shared_ptr<Show>;
+
+
+} // namespace Ui