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/*
* Copyright (c) 2021-2022, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Noncopyable.h>
#include <LibGUI/Event.h>
#include <LibGUI/TextDocument.h>
namespace GUI {
enum CursorWidth {
NARROW,
WIDE
};
enum EngineType {
Regular,
Vim,
};
class MoveLineUpOrDownCommand;
class EditingEngine {
AK_MAKE_NONCOPYABLE(EditingEngine);
AK_MAKE_NONMOVABLE(EditingEngine);
public:
virtual ~EditingEngine() = default;
virtual CursorWidth cursor_width() const { return NARROW; }
void attach(TextEditor& editor);
void detach();
TextEditor& editor()
{
VERIFY(!m_editor.is_null());
return *m_editor.unsafe_ptr();
}
virtual bool on_key(KeyEvent const& event);
bool is_regular() const { return engine_type() == EngineType::Regular; }
bool is_vim() const { return engine_type() == EngineType::Vim; }
void get_selection_line_boundaries(Badge<MoveLineUpOrDownCommand>, size_t& first_line, size_t& last_line);
protected:
EditingEngine() = default;
WeakPtr<TextEditor> m_editor;
enum class DidMoveALine {
No,
Yes,
};
void move_one_left();
void move_one_right();
void move_one_helper(KeyEvent const& event, VerticalDirection direction);
DidMoveALine move_one_up(KeyEvent const& event);
DidMoveALine move_one_down(KeyEvent const& event);
void move_to_previous_span();
void move_to_next_span();
void move_to_logical_line_beginning();
void move_to_logical_line_end();
void move_to_line_beginning();
void move_to_line_end();
void move_page_up();
void move_page_down();
void move_to_first_line();
void move_to_last_line();
void move_up(double page_height_factor);
void move_down(double page_height_factor);
void get_selection_line_boundaries(size_t& first_line, size_t& last_line);
void delete_line();
void delete_char();
virtual EngineType engine_type() const = 0;
};
class MoveLineUpOrDownCommand : public TextDocumentUndoCommand {
public:
MoveLineUpOrDownCommand(TextDocument&, KeyEvent event, EditingEngine&);
virtual void undo() override;
virtual void redo() override;
bool merge_with(GUI::Command const&) override;
DeprecatedString action_text() const override;
static bool valid_operation(EditingEngine& engine, VerticalDirection direction);
private:
void move_lines(VerticalDirection);
TextRange retrieve_selection(VerticalDirection);
KeyEvent m_event;
VerticalDirection m_direction;
EditingEngine& m_engine;
TextRange m_selection;
TextPosition m_cursor;
};
}
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