Started working on RichTextBox (Broken commit)

src/RichTextBox/RichTextBox.hpp

@@ -0,0 +1,69 @@
+#pragma once
+#include <cstdint>
+#include <include/core/SkCanvas.h>
+#include <modules/skparagraph/include/FontCollection.h>
+#include <modules/skparagraph/include/Paragraph.h>
+#include "../SharedTypes.hpp"
+
+class RichTextBox {
+    public:
+        RichTextBox();
+
+        enum class Movement {
+            LEFT,
+            RIGHT,
+            UP,
+            DOWN,
+            HOME,
+            END
+        };
+
+        struct Cursor {
+            uint64_t pos = 0;
+            uint64_t selectionBeginPos = 0;
+            uint64_t selectionEndPos = 0;
+        };
+
+        struct PaintOpts {
+            SkColor4f cursorColor = {1, 0, 0, 1};
+            std::optional<Cursor> cursor;
+        };
+
+        uint64_t move(Movement movement, uint64_t pos);
+        void set_width(float newWidth);
+        uint64_t insert(uint64_t pos, const std::string& textToInsert);
+        uint64_t remove(uint64_t start, uint64_t end);
+        void set_font_collection(const sk_sp<skia::textlayout::FontCollection>& fC);
+        void paint(SkCanvas* canvas, const PaintOpts& paintOpts);
+        void set_allow_newlines(bool allow);
+
+        enum class InputKey {
+            LEFT,
+            RIGHT,
+            UP,
+            DOWN,
+            HOME,
+            END,
+            BACKSPACE,
+            DELETE,
+            ENTER,
+            SELECT_ALL
+        };
+
+        void process_key_input(Cursor& cur, InputKey in, bool ctrl, bool shift);
+        std::string process_copy(Cursor& cur);
+        std::string process_cut(Cursor& cur);
+        void process_text_input(Cursor& cur, const std::string& in);
+    private:
+        SkRect get_cursor_rect(uint64_t pos);
+
+        void rebuild();
+
+        bool newlinesAllowed = true;
+        float width = 100.0f;
+        float fontSize = 0.0f;
+        bool needsRebuild = true;
+        sk_sp<skia::textlayout::FontCollection> fontCollection;
+        std::unique_ptr<skia::textlayout::Paragraph> paragraph;
+        std::string text;
+};