refactor: decouple statusline from scene & cursor controller

Might be slightly slower than previously though...

2 files changed, 144 insertions, 0 deletions

diff --git a/src/engine/components/statusline.cpp b/src/engine/components/statusline.cpp
new file mode 100644
index 0000000..ae0f3fa
--- /dev/null
+++ b/src/engine/components/statusline.cpp
@@ -0,0 +1,99 @@
+#include "statusline.hpp"
+
+#include "engine/data/vector2.hpp"
+#include "util/color.hpp"
+
+#include <fmt/color.h>
+
+#include <utility>
+
+StatusLine::StatusLine(std::shared_ptr<ComponentMatrix> component_matrix) noexcept
+	: _component_matrix(std::move(component_matrix)), _need_render(false)
+{
+	_component_matrix->fill(' ');
+}
+
+auto StatusLine::get() const noexcept -> const std::shared_ptr<ComponentMatrix> &
+{
+	return _component_matrix;
+}
+
+auto StatusLine::get_need_render() const noexcept -> bool
+{
+	return _need_render;
+}
+
+void StatusLine::set_need_render(bool need_render) noexcept
+{
+	_need_render = need_render;
+}
+
+auto StatusLine::get_foreground_color() const noexcept -> uint32_t
+{
+	return static_cast<uint32_t>(fmt::color::white);
+}
+
+auto StatusLine::get_background_color() const noexcept -> uint32_t
+{
+	return STATUSLINE_COLOR;
+}
+
+void StatusLine::set_status(
+	StatusLineSection section,
+	const std::string_view &status,
+	int32_t start) noexcept
+{
+	_clear_section(section, start);
+
+	auto section_start = _get_section_start_x(section);
+
+	auto pos = Vector2({.x = section_start + start, .y = 0});
+
+	for (const auto &character : status)
+	{
+		_component_matrix->set(pos, character);
+
+		pos += Vector2::right();
+	}
+
+	set_need_render(true);
+}
+
+void StatusLine::set_section_length(StatusLineSection section, int32_t length) noexcept
+{
+	_section_lengths[section] = length;
+}
+
+auto StatusLine::_get_section_start_x(StatusLineSection section) const noexcept -> int32_t
+{
+	int32_t section_start = 0;
+
+	auto section_index = static_cast<int32_t>(section);
+
+	while (section_index > 0)
+	{
+		const auto prev_section = static_cast<StatusLineSection>(section_index - 1);
+
+		section_start += static_cast<int32_t>(_section_lengths.at(prev_section));
+
+		section_index--;
+	}
+
+	return section_start;
+}
+
+void StatusLine::_clear_section(StatusLineSection section, int32_t start) noexcept
+{
+	auto section_start = _get_section_start_x(section);
+
+	auto pos = Vector2({.x = section_start + start, .y = 0});
+
+	auto section_length = _section_lengths[section];
+
+	for (auto index = 0; index < section_length - start; index++)
+	{
+		_component_matrix->set(pos, ' ');
+
+		pos += Vector2::right();
+	}
+}
diff --git a/src/engine/components/statusline.hpp b/src/engine/components/statusline.hpp
new file mode 100644
index 0000000..3fdb8d3
--- /dev/null
+++ b/src/engine/components/statusline.hpp
@@ -0,0 +1,45 @@
+#pragma once
+
+#include "interfaces/matrix.hpp"
+#include "interfaces/statusline.hpp"
+
+#include "engine/data/vector2.hpp"
+
+#include <memory>
+#include <string_view>
+#include <unordered_map>
+
+constexpr uint32_t STATUSLINE_COLOR = 0x1A1A1AU;
+
+class StatusLine : public IStatusLine
+{
+public:
+	explicit StatusLine(std::shared_ptr<ComponentMatrix> component_matrix) noexcept;
+
+	auto get() const noexcept -> const std::shared_ptr<ComponentMatrix> & override;
+
+	[[nodiscard]] auto get_need_render() const noexcept -> bool override;
+
+	void set_need_render(bool need_render) noexcept override;
+
+	auto get_foreground_color() const noexcept -> uint32_t override;
+
+	auto get_background_color() const noexcept -> uint32_t override;
+
+	void set_status(
+		StatusLineSection section,
+		const std::string_view &status,
+		int32_t start) noexcept override;
+
+	void set_section_length(StatusLineSection section, int32_t length) noexcept override;
+
+private:
+	std::shared_ptr<ComponentMatrix> _component_matrix;
+	std::unordered_map<StatusLineSection, int32_t> _section_lengths;
+	bool _need_render;
+
+	[[nodiscard]] auto _get_section_start_x(StatusLineSection section) const noexcept
+		-> int32_t;
+
+	void _clear_section(StatusLineSection section, int32_t start) noexcept;
+};