From b84c87ef820976cc541586a09ec6f845726580f2 Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Sat, 17 Oct 2026 03:54:06 +0800
Subject: feat(tui): add Unicode text service and document layout

---
 ricochet/src/tui/layout.hh | 98 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 ricochet/src/tui/layout.hh

(limited to 'ricochet/src/tui/layout.hh')

diff --git a/ricochet/src/tui/layout.hh b/ricochet/src/tui/layout.hh
new file mode 100644
index 0000000..5feb0cd
--- /dev/null
+++ b/ricochet/src/tui/layout.hh
@@ -0,0 +1,98 @@
+/*
+ * Ricochet - A minimalist CLI web browser for fast, distraction-free navigation.
+ * Copyright (C) 2026  Richard Qin
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "paint.hh"
+#include "ricochet/tui/view.hh"
+#include "text.hh"
+
+#include <cstddef>
+#include <cstdint>
+#include <optional>
+#include <span>
+#include <variant>
+#include <vector>
+
+namespace ricochet::tui::detail {
+
+using HitTarget = std::variant<LinkId, ControlId>;
+
+struct LayoutPoint
+{
+  std::size_t row { 0 };
+  std::int64_t column { 0 };
+};
+
+struct LayoutHit
+{
+  DisplayPosition position {};
+  DocumentRange unit {};
+  std::optional<HitTarget> target {};
+};
+
+struct LayoutGlyph
+{
+  LayoutPoint position {};
+  int columns { 0 };
+  std::wstring text {};
+  TextStyle style {};
+  DocumentRange source {};
+  std::optional<HitTarget> target {};
+  // Clip bounds are in document-layout columns and also constrain hit testing.
+  std::int64_t clip_left { 0 };
+  std::int64_t clip_right { 0 };
+  // Structural boundaries locate anchors but do not displace nearby text hits.
+  bool boundary_only { false };
+  std::int64_t line_start { 0 };
+  bool decoration { false };
+  bool line_break { false };
+  bool fill { false };
+};
+
+struct LayoutData
+{
+  // Reading order, including table cells in row/cell order; not screen order.
+  std::vector<LayoutGlyph> glyphs {};
+  std::size_t rows { 1 };
+  std::int64_t extent { 0 };
+};
+
+// A derived snapshot for one Document + initial control values + width/scrolls.
+// Editing will supply a separate draft snapshot; this stage uses revision zero.
+// No ncurses headers, terminal objects or business-module dependencies.
+class DocumentLayout
+{
+public:
+  DocumentLayout( const Document& document,
+                  const TextService& text,
+                  int columns,
+                  std::span<const HorizontalScroll> scrolls );
+
+  int columns() const;
+  std::size_t rows() const;
+  std::optional<LayoutPoint> locate( const DisplayPosition& position ) const;
+  std::optional<LayoutHit> hit( LayoutPoint point ) const;
+  void append_frame( Frame& frame, std::size_t first_row, CellPoint origin, ScreenSize viewport ) const;
+
+private:
+  int columns_;
+  LayoutData data_;
+};
+
+} // namespace ricochet::tui::detail
-- 
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