smol/move.c

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/* $Id$ */
/**************************************************************************
* move.c *
* *
* Copyright (C) 1999-2003 Chris Allegretta *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2, or (at your option) *
* any later version. *
* *
* This program 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 General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software *
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
* *
**************************************************************************/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <assert.h>
#include "proto.h"
#include "nano.h"
int do_home(void)
{
current_x = 0;
placewewant = 0;
update_line(current, current_x);
return 1;
}
int do_end(void)
{
current_x = strlen(current->data);
placewewant = xplustabs();
update_line(current, current_x);
return 1;
}
void page_up(void)
{
if (edittop != fileage) {
#ifndef NANO_SMALL
if (ISSET(SMOOTHSCROLL))
edit_update(edittop->prev, TOP);
else
#endif
{
edit_update(edittop, CENTER);
/* Now that we've updated the edit window, edittop might be
at the top of the file; if so, just move the cursor up one
line and don't center it. */
if (edittop != fileage)
center_cursor();
else
reset_cursor();
}
} else
current_y = 0;
update_cursor();
}
int do_page_up(void)
{
int i;
wrap_reset();
current_x = 0;
placewewant = 0;
if (current == fileage)
return 0;
current_y = 0;
current = edittop;
for (i = 0; i <= editwinrows - 3 && current->prev != NULL; i++)
current = current->prev;
edit_update(current, TOP);
update_cursor();
check_statblank();
return 1;
}
int do_page_down(void)
{
wrap_reset();
current_x = 0;
placewewant = 0;
if (current == filebot)
return 0;
/* AHEM, if we only have a screen or less of text, DON'T do an
edit_update(), just move the cursor to editbot! */
if (edittop == fileage && editbot == filebot && totlines < editwinrows) {
current = editbot;
reset_cursor();
#ifndef NANO_SMALL
/* ...unless marking is on, in which case we need it to update
the highlight. */
if (ISSET(MARK_ISSET))
edit_update(current, NONE);
#endif
} else if (editbot != filebot || edittop == fileage) {
current_y = 0;
current = editbot;
if (current->prev != NULL)
current = current->prev;
if (current->prev != NULL)
current = current->prev;
edit_update(current, TOP);
} else {
while (current != filebot) {
current = current->next;
current_y++;
}
edit_update(edittop, TOP);
}
update_cursor();
check_statblank();
return 1;
}
int do_up(void)
{
wrap_reset();
if (current->prev != NULL) {
current_x = actual_x(current->prev, placewewant);
current = current->prev;
if (current_y > 0) {
update_line(current->next, 0);
/* It is necessary to change current first, so the mark
display will change! */
current_y--;
update_line(current, current_x);
} else
page_up();
check_statblank();
}
return 1;
}
/* Return value 1 means we moved down, 0 means we were already at the
* bottom. */
int do_down(void)
{
wrap_reset();
check_statblank();
if (current->next == NULL)
return 0;
current = current->next;
current_x = actual_x(current, placewewant);
/* Note current_y is zero-based. This test checks for the cursor's
* being on the last row of the edit window. */
if (current_y == editwinrows - 1) {
#ifndef NANO_SMALL
if (ISSET(SMOOTHSCROLL)) {
/* In this case current_y does not change. The cursor
* remains at the bottom of the edit window. */
edittop = edittop->next;
editbot = editbot->next;
edit_refresh();
} else
#endif
{
/* Set edittop so editbot->next (or else editbot) is
* centered, and set current_y = editwinrows / 2. */
edit_update(editbot->next != NULL ? editbot->next : editbot, CENTER);
center_cursor();
}
} else {
update_line(current->prev, 0);
update_line(current, current_x);
current_y++;
}
return 1;
}
int do_left(void)
{
if (current_x > 0)
current_x--;
else if (current != fileage) {
do_up();
current_x = strlen(current->data);
}
placewewant = xplustabs();
update_line(current, current_x);
check_statblank();
return 1;
}
int do_right(void)
{
assert(current_x <= strlen(current->data));
if (current->data[current_x] != '\0')
current_x++;
else if (current->next != NULL) {
do_down();
current_x = 0;
}
placewewant = xplustabs();
update_line(current, current_x);
check_statblank();
return 1;
}