127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/*
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* Copyright (c) 2013, 2014 Jonas 'Sortie' Termansen.
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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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size_t editor_select_column_set(struct editor* editor, size_t x)
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{
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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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return editor->select_column = x;
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}
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size_t editor_select_row_set(struct editor* editor, size_t y)
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{
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if ( editor->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 + editor->viewport_height <= y )
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editor->page_y_offset = y + 1- editor->viewport_height;
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}
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return editor->select_row = y;
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}
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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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editor_select_column_set(editor, x);
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editor_select_row_set(editor, y);
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}
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size_t editor_select_column_dec(struct editor* editor)
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{
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assert(editor->select_column);
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return editor_select_column_set(editor, editor->select_column-1);
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}
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size_t editor_select_column_inc(struct editor* editor)
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{
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// TODO: Assert line doesn't overflow!
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return editor_select_column_set(editor, editor->select_column+1);
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}
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size_t editor_select_row_dec(struct editor* editor)
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{
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assert(editor->select_row);
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return editor_select_row_set(editor, editor->select_row-1);
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}
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size_t editor_select_row_inc(struct editor* editor)
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{
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// TODO: Assert line doesn't overflow!
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return editor_select_row_set(editor, editor->select_row+1);
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}
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size_t editor_cursor_column_set(struct editor* editor, size_t x)
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{
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editor_select_column_set(editor, x);
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editor_select_row_set(editor, editor->cursor_row);
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return editor->cursor_column = x;
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}
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size_t editor_cursor_row_set(struct editor* editor, size_t y)
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{
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editor_select_column_set(editor, editor->cursor_column);
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editor_select_row_set(editor, y);
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return editor->cursor_row = y;
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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_cursor_column_set(editor, x);
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editor_cursor_row_set(editor, y);
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}
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size_t editor_cursor_column_dec(struct editor* editor)
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{
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assert(editor->cursor_column);
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return editor_cursor_column_set(editor, editor->cursor_column-1);
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}
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size_t editor_cursor_column_inc(struct editor* editor)
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{
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// TODO: Assert line doesn't overflow!
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return editor_cursor_column_set(editor, editor->cursor_column+1);
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}
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size_t editor_cursor_row_dec(struct editor* editor)
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{
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assert(editor->cursor_row);
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return editor_cursor_row_set(editor, editor->cursor_row-1);
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}
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size_t editor_cursor_row_inc(struct editor* editor)
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{
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// TODO: Assert line doesn't overflow!
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return editor_cursor_row_set(editor, editor->cursor_row+1);
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}
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