Add "Fullscreen UI"

src/frontend-common/fullscreen_ui_progress_callback.h

@@ -0,0 +1,38 @@
+#pragma once
+#include "common/progress_callback.h"
+#include "common/string.h"
+
+namespace FullscreenUI {
+
+class ProgressCallback final : public BaseProgressCallback
+{
+public:
+  ProgressCallback(String name);
+  ~ProgressCallback() override;
+
+  void PushState() override;
+  void PopState() override;
+
+  void SetCancellable(bool cancellable) override;
+  void SetTitle(const char* title) override;
+  void SetStatusText(const char* text) override;
+  void SetProgressRange(u32 range) override;
+  void SetProgressValue(u32 value) override;
+
+  void DisplayError(const char* message) override;
+  void DisplayWarning(const char* message) override;
+  void DisplayInformation(const char* message) override;
+  void DisplayDebugMessage(const char* message) override;
+
+  void ModalError(const char* message) override;
+  bool ModalConfirmation(const char* message) override;
+  void ModalInformation(const char* message) override;
+
+private:
+  void Redraw(bool force);
+
+  String m_name;
+  int m_last_progress_percent = -1;
+};
+
+} // namespace FullscreenUI