133 lines
3.7 KiB
C++
133 lines
3.7 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013, 2014.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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command.c++
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Editor cursor.
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*******************************************************************************/
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#define __STDC_CONSTANT_MACROS
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#define __STDC_FORMAT_MACROS
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#define __STDC_LIMIT_MACROS
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#include <assert.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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