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/*
* Copyright © 2018–2019 Egmont Koblinger
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
#include <glib.h>
#include "ring.hh"
#include "vterowdata.hh"
#include "vtetypes.hh"
#include "vteunistr.h"
namespace vte {
namespace base {
/*
* RingView provides a "view" to a continuous segment of the Ring (or stream),
* typically the user visible area.
*
* It computes additional data that are needed to display the contents (or handle
* user events such as mouse click), but not needed for the terminal emulation logic.
* In order to save tons of resources, these data are computed when the Ring's
* contents are about to be displayed, rather than whenever they change.
*
* For computing these data, context lines (outside of the specified region of the
* Ring) are also taken into account up to the next hard newline or a safety limit.
*
* Currently RingView is used for BiDi: to figure out which logical character is
* mapped to which visual position.
*
* Future possible uses include "highlight all" for the search match, and
* syntax highlighting. URL autodetection might also be ported to this
* infrastructure one day.
*/
class RingView {
public:
RingView();
~RingView();
// prevent accidents
RingView(RingView& o) = delete;
RingView(RingView const& o) = delete;
RingView(RingView&& o) = delete;
RingView& operator= (RingView& o) = delete;
RingView& operator= (RingView const& o) = delete;
RingView& operator= (RingView&& o) = delete;
void set_ring(Ring *ring);
void set_rows(vte::grid::row_t start, vte::grid::row_t len);
void set_width(vte::grid::column_t width);
inline constexpr vte::grid::column_t get_width() const noexcept { return m_width; }
inline void invalidate() { m_invalid = true; }
inline constexpr bool is_updated() const noexcept { return !m_invalid; }
void update();
void pause();
VteRowData const* get_row(vte::grid::row_t row) const;
private:
Ring *m_ring{nullptr};
VteRowData **m_rows{nullptr};
int m_rows_len{0};
int m_rows_alloc_len{0};
vte::grid::row_t m_top{0}; /* the row of the Ring corresponding to m_rows[0] */
vte::grid::row_t m_start{0};
vte::grid::row_t m_len{0};
vte::grid::column_t m_width{0};
bool m_invalid{true};
bool m_paused{true};
void resume();
};
}; /* namespace base */
}; /* namespace vte */
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