65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/*
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* Copyright (c) 2013, 2014 Jonas 'Sortie' Termansen.
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* Copyright (c) 2021 Juhani 'nortti' Krekelä.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* cursor.c
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* Editor cursor.
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*/
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#include <assert.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include "cursor.h"
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#include "display.h"
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#include "editor.h"
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void editor_select_set(struct editor* editor, size_t y, size_t x)
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{
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assert(y < editor->lines_used);
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assert(x <= editor->lines[y].used);
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size_t viewport_height = editor->viewport_height;
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// Account for the modal shrinking the viewport by one line.
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if ( editor->mode != MODE_EDIT && viewport_height )
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viewport_height--;
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if ( viewport_height )
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{
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if ( y < editor->page_y_offset )
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editor->page_y_offset = y;
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if ( editor->page_y_offset + viewport_height <= y )
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editor->page_y_offset = y + 1 - viewport_height;
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}
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editor->select_row = y;
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if ( editor->viewport_width )
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{
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struct line* line = &editor->lines[editor->select_row];
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size_t rx = displayed_string_length(line->data, x, editor->tabsize);
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if ( rx < editor->page_x_offset )
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editor->page_x_offset = rx;
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if ( editor->page_x_offset + editor->viewport_width <= rx )
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editor->page_x_offset = rx + 1 - editor->viewport_width;
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}
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editor->select_column = x;
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}
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void editor_cursor_set(struct editor* editor, size_t y, size_t x)
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{
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editor_select_set(editor, y, x);
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editor->cursor_column = x;
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editor->cursor_row = y;
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}
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