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/*
Copyright 2001-2003 David Gucwa
Copyright 2017-2019 Adam Bilbrough
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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "move.h"
#include "main.h"
void moveDown(struct position *p) {
positionDown(p);
if(p->cursY==maxY-1 && p==¤tBuffer->cursor) {
scrollDown();
}
}
void moveUp(struct position *p) {
positionUp(p);
if(p->cursY==-1 && p==¤tBuffer->cursor) {
scrollUp();
}
}
char moveLeft(struct position *p) {
/*
Returns 0 upon normal movement
Returns 1 if the position could not be moved left
Returns 2 if moving left caused the position to enter the previous line
Returns 3 if moving left caused the position to wrap on the same line
*/
char r = 0;
if(p->l == currentBuffer->head->next && p->offset == 0) {
/* Beginning of file */
return 1;
}
if(!p->offset) {
/* Beginning of line */
p->l = p->l->prev;
p->offset = p->l->length - 1;
if(p->l->hasTabs) {
determineCursX(p);
}
else {
p->cursX = p->offset % maxX;
}
p->cursY--;
p->lineNum--;
r = 2;
}
else {
p->offset--;
if(!p->cursX) {
r = 3;
p->cursY--;
if(p->l->hasTabs) {
determineCursX(p);
}
else {
p->cursX = maxX - 1;
}
}
else {
if(p->l->hasTabs)
determineCursX(p);
else
p->cursX--;
}
}
if(p->cursY==-1 && p==¤tBuffer->cursor) {
scrollUp();
}
return r;
}
char moveRight(struct position *p) {
/*
Returns 0 upon normal movement
Returns 1 if the position could not be moved right (end of file)
Returns 2 if moving right caused the position to enter the next line
Returns 3 if moving right caused the position to wrap on the same line
*/
char r=0;
if(p->l->next == currentBuffer->tail && p->offset == p->l->length-1) {
/* End of file */
return 1;
}
if(p->offset < p->l->length - 1) {
/* Normal movement */
int temp = p->cursX;
p->offset++;
if (p->l->hasTabs) {
determineCursX(p);
} else {
p->cursX++;
if (p->cursX == maxX) {
p->cursX=0;
}
}
if (p->cursX < temp) {
p->cursY++;
r = 3;
}
}
else {
/* Next line */
p->l = p->l->next;
p->cursX = p->offset = 0;
p->cursY++;
p->lineNum++;
r = 2; //Hit a new line
}
if(p->cursY == maxY-1 && p==¤tBuffer->cursor) {
scrollDown();
}
return r;
}
char scrollDown()
{
/* Returns 1 if the screen did not scroll down */
if(currentBuffer->topLine.lineNum + (maxY>>1) > currentBuffer->numLines) {
return 1;
}
if(currentBuffer->cursor.cursY==0) {
positionDown(¤tBuffer->cursor);
}
if(!positionDown(¤tBuffer->topLine)) {
currentBuffer->cursor.cursY--;
}
currentBuffer->lineUpdate = currentBuffer->topLine;
currentBuffer->lineUpdate.lineNum = 0;
currentBuffer->keepGoing = 1;
return 0;
}
char scrollUp()
{
/* Returns 1 if the screen did not scroll up */
if(currentBuffer->cursor.cursY==maxY-1) {
positionUp(¤tBuffer->cursor);
}
if(!positionUp(¤tBuffer->topLine)) {
currentBuffer->cursor.cursY++;
}
currentBuffer->lineUpdate = currentBuffer->topLine;
currentBuffer->lineUpdate.lineNum = 0;
currentBuffer->keepGoing = 1;
return 0;
}
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