103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
#ifndef BUFFERVIEW_H
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#define BUFFERVIEW_H
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#include "Buffer.h"
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#include "CharacterWidthDeterminer.h"
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#include <functional>
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#include "BufferLineWalker.h"
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/**
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* Tracks a "view" of a buffer, which is a two-dimensional grid of characters
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* that displays a section of a buffer's contents.
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*/
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class BufferView
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{
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public:
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class Iterator
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{
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public:
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Iterator(BufferView & bv) : m_buffer_view(bv)
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{
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if (bv.m_iterator->valid())
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{
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m_iterator = std::make_shared<Buffer::Iterator>(*m_buffer_view.m_first_line);
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m_row_offset = m_buffer_view.m_first_line_row_offset;
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}
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}
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void operator++()
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{
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(*this)++;
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}
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void operator++(int unused)
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{
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if (is_valid())
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{
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m_row_offset += m_buffer_view.calculate_rows_in_line(m_iterator);
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if ((m_row_offset >= m_buffer_view.m_height) || (!m_iterator->go_next_line()))
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{
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m_iterator.reset();
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}
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}
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}
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bool is_valid()
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{
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return (bool)m_iterator;
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}
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int row_offset() const
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{
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return m_row_offset;
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}
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std::shared_ptr<Buffer::Iterator> iterator() const
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{
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return m_iterator;
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}
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protected:
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BufferView & m_buffer_view;
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std::shared_ptr<Buffer::Iterator> m_iterator;
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int m_row_offset;
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};
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BufferView(std::shared_ptr<Buffer> buffer,
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std::shared_ptr<Buffer::Iterator> iterator,
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CharacterWidthDeterminer & character_width_determiner);
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void resize(int width, int height);
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void set_scroll_offset(int scroll_offset);
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Iterator vert_iter();
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BufferLineWalker horiz_iter(std::shared_ptr<Buffer::Iterator> start_of_line)
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{
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return BufferLineWalker(m_buffer, start_of_line, m_width, m_character_width_determiner);
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}
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int cursor_screen_row() const { return m_cursor_screen_row; }
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int cursor_screen_column() const { return m_cursor_screen_column; }
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int cursor_virtual_column() const { return m_cursor_virtual_column; }
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protected:
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std::shared_ptr<Buffer> m_buffer;
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std::shared_ptr<Buffer::Iterator> m_iterator;
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std::shared_ptr<Buffer::Iterator> m_first_line;
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int m_first_line_row_offset;
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int m_width;
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int m_height;
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int m_scroll_offset;
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int m_cursor_screen_row;
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int m_cursor_screen_column;
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int m_cursor_virtual_column;
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int m_cursor_row_offset;
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CharacterWidthDeterminer & m_character_width_determiner;
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int effective_scroll_offset()
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{
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return std::min(m_scroll_offset, (m_height - 1) / 2);
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}
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void update();
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int calculate_rows_in_line(std::shared_ptr<Buffer::Iterator> start_of_line);
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int calculate_rows_in_cursor_line(std::shared_ptr<Buffer::Iterator> start_of_line);
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int screen_rows_below_line(std::shared_ptr<Buffer::Iterator> line);
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int screen_rows_above_line(
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std::shared_ptr<Buffer::Iterator> line,
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std::list<std::pair<int, std::shared_ptr<Buffer::Iterator>>> & backward_lines);
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};
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#endif
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