implement file viewer

1 files changed, 34 insertions, 0 deletions

diff --git a/lib/nes/app/ui/screen-file-viewer.hh b/lib/nes/app/ui/screen-file-viewer.hh
new file mode 100644
index 0000000..ed01e6f
--- /dev/null
+++ b/lib/nes/app/ui/screen-file-viewer.hh
@@ -0,0 +1,34 @@
+#pragma once
+
+#include "nes/common/types.hh"
+#include "nes/common/containers/string-view.hh"
+#include "nes/app/ui/screen.hh"
+#include "nes/common/containers/string-view.hh"
+
+namespace nes::app
+{
+	class input_device_keyboard;
+	class file_browser;
+
+	/// An popup showing the contents of a file.
+	class screen_file_viewer final : public screen
+	{
+		static constexpr auto line_length = u32{ 24 };
+		static constexpr auto buffer_length = u32{ 1024 };
+		static constexpr auto max_line_count = u32{ 16 };
+
+		input_device_keyboard& keyboard_;
+		file_browser& file_browser_;
+		u8 buffer_[buffer_length];
+		string_view lines_[max_line_count];
+		u32 line_count_{ 0 };
+
+	public:
+		explicit screen_file_viewer(input_device_keyboard&, file_browser&);
+
+		auto load(string_view file_name) -> status;
+
+		auto render(renderer&) -> void override;
+		auto process_events() -> action override;
+	};
+} // namespace nes::app