More progress

Signed-off-by: Slendi <slendi@socopon.com>

src/ImGui.hpp

@@ -0,0 +1,61 @@
+#pragma once
+
+#include <bitset>
+#include <memory>
+
+#include <raylib.h>
+
+#include "TextRenderer.hpp"
+
+struct TextInputOptions {
+	bool multiline { false };
+};
+
+struct ImGui {
+	ImGui(std::shared_ptr<TextRenderer> text_renderer);
+
+	ImGui(ImGui const &) = delete;
+	auto operator=(ImGui const &) -> ImGui & = delete;
+	ImGui(ImGui &&) = default;
+	auto operator=(ImGui &&) -> ImGui & = default;
+
+	void begin(std::pmr::vector<u32> const input_runes, bool ctrl, bool shift);
+	void end();
+
+	// Bit 0 -> Submitted
+	// Bit 1 -> String changed
+	auto text_input(std::size_t id, std::pmr::string &str, Rectangle rec,
+	    TextInputOptions options = {}) -> std::bitset<2>;
+
+	[[nodiscard]] inline auto id(std::string_view const str) -> std::size_t
+	{
+		std::hash<std::string_view> hasher;
+		return hasher(str);
+	}
+
+private:
+	struct TextInputState {
+		int current_rune_idx { 0 };
+	};
+
+	std::unordered_map<std::size_t, TextInputState> m_ti_states;
+	std::size_t m_focused {};
+	std::pmr::vector<u32> m_input_runes {}; // 0123 <-> hjkl arrow keys
+	bool m_ctrl {};
+	bool m_shift {};
+
+	std::shared_ptr<TextRenderer> m_text_renderer {};
+};
+
+struct ImGuiGuard {
+	ImGuiGuard(ImGui *imgui, std::pmr::vector<u32> const input_runes, bool ctrl,
+	    bool shift)
+	    : m_imgui(imgui)
+	{
+		m_imgui->begin(input_runes, ctrl, shift);
+	}
+	~ImGuiGuard() { m_imgui->end(); }
+
+private:
+	ImGui *m_imgui { nullptr };
+};