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/*
* 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 "document_text.hh"
#include "layout.hh"
#include <chrono>
namespace ricochet::tui::detail {
enum class ViewMotion : std::uint8_t
{
Left,
Right,
Up,
Down,
NextWord,
PreviousWord,
WordEnd,
LineStart,
LineEnd,
DocumentStart,
DocumentEnd,
PageUp,
PageDown,
HalfPageUp,
HalfPageDown,
PanLeft,
PanRight
};
// One tab's reading state. It owns the logical snapshot; screen rows are caches.
// Keyboard, mouse and host navigation all use the same layout/source mappings.
class DocumentView
{
public:
DocumentView( Document document, ViewSnapshot snapshot, const TextService& text, ScreenSize viewport );
const Document& document() const;
const ViewSnapshot& snapshot() const;
void resize( ScreenSize viewport );
void move( ViewMotion motion );
void press( CellPoint point, std::chrono::steady_clock::time_point now );
// The session routes these only while dragging() owns mouse capture.
void drag( CellPoint point );
void release( CellPoint point );
void stop_drag();
bool dragging() const;
bool tick( std::chrono::steady_clock::time_point now );
void begin_selection();
void cancel_selection();
std::optional<std::string> selected_text() const;
void wheel( int steps );
bool locate( const DocumentPoint& point );
std::optional<HitTarget> focused_target() const;
void draw( Frame& frame, CellPoint origin ) const;
private:
std::size_t last_top_row() const;
void set_top_row( std::size_t row );
void restore_viewport();
void apply_scrolls( std::span<const HorizontalScroll> changes );
void reveal_cursor();
void finish_move( bool preserve_column );
void move_rows( std::int64_t distance, bool page );
void extend_selection();
void drag_to_pointer();
struct Drag
{
CellPoint press {};
CellPoint pointer {};
DocumentRange anchor {};
bool selecting { false };
std::chrono::steady_clock::time_point next_scroll {};
};
Document document_;
ViewSnapshot snapshot_;
const TextService& text_;
DocumentText content_;
ScreenSize viewport_;
DocumentLayout layout_;
std::size_t top_row_ { 0 };
std::int64_t desired_column_ { 0 };
bool follow_cursor_ { false };
std::optional<Drag> drag_ {};
};
} // namespace ricochet::tui::detail
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