desktop code refactoring

Signed-off-by: Peter Siegmund <developer@mars3142.org>

src/ui/Device.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <functional>
+#include <memory>
+#include <vector>
+
+#include "UIWidget.h"
+#include "model/AppContext.h"
+#include "common/Widget.h"
+
+class Device final : public UIWidget {
+public:
+    explicit Device(void* appstate);
+
+    void render() const override;
+
+    void hit_test(SDL_MouseMotionEvent* event) const;
+
+    void onButtonClicked(uint8_t button) const;
+
+private:
+    void draw_background() const;
+
+    void draw_screen() const;
+
+    void draw_text() const;
+
+    void render_u8g2() const;
+
+    void setScreen(const std::shared_ptr<Widget>& screen);
+
+    void pushScreen(const std::shared_ptr<Widget>& screen);
+
+    void popScreen();
+
+    static void pushKey(SDL_Keycode key);
+
+    std::vector<std::shared_ptr<UIWidget>> m_children{};
+
+    std::shared_ptr<Widget> widget;
+    std::vector<std::shared_ptr<Widget>> history;
+};