motion.c

aee是一种易使用的文本编辑器。你可以不用说明书来使用它。它提供终端接口和本地的X-windows接口。它的特性包括即弹的菜单

					draw_line((curr_buff->scr_vert-(curr_buff->scr_pos/COLS)), 0, curr_buff->curr_line->line, 1, curr_buff->curr_line);
				}
			}
			else
				curr_buff->scr_vert += curr_buff->scr_pos / COLS;
			curr_buff->absolute_lin++;
		}
	}
	else if (curr_buff->curr_line->next_line == NULL)
	{
		wmove(com_win, 0,0);
		werase(com_win);
		wprintw(com_win, right_err_msg);
		wrefresh(com_win);
		clr_cmd_line = TRUE;
	}
	curr_buff->abs_pos = tscr_pos;
	wmove(curr_buff->win, curr_buff->scr_vert, curr_buff->scr_horz);
}

void 
adv_word()	/* advance to next word in text		*/
{
	if (curr_buff->position != curr_buff->curr_line->line_length)
	{
		while ((curr_buff->position < curr_buff->curr_line->line_length) && ((*curr_buff->pointer != ' ') && (*curr_buff->pointer != '\t')))
			right(TRUE);
		while ((curr_buff->position < curr_buff->curr_line->line_length) && ((*curr_buff->pointer == ' ') || (*curr_buff->pointer == '\t')))
			right(TRUE);
	}
	else
		right(TRUE);
}

void 
prev_word()	/* move to start of previous word in text	*/
{
	if (curr_buff->position != 1)
	{
		if ((curr_buff->position != 1) && ((curr_buff->pointer[-1] == ' ') || (curr_buff->pointer[-1] == '\t')))
		{	/* if at the start of a word	*/
			while ((curr_buff->position != 1) && ((*curr_buff->pointer != ' ') && (*curr_buff->pointer != '\t')))
				left(TRUE);
		}
		while ((curr_buff->position != 1) && ((*curr_buff->pointer == ' ') || (*curr_buff->pointer == '\t')))
			left(TRUE);
		while ((curr_buff->position != 1) && ((*curr_buff->pointer != ' ') && (*curr_buff->pointer != '\t')))
			left(TRUE);
		if ((curr_buff->position != 1) && ((*curr_buff->pointer == ' ') || (*curr_buff->pointer == '\t')))
			right(TRUE);
	}
	else
		left(TRUE);
}

void 
move_rel(direction, lines)	/* move relative # of lines to current line */
char *direction;
int lines;
{
	struct text *tmp_paste;
	struct text *tmp_line;
	int i;
	int j;
	int m;
	int slct_flag;
	char *tmp;

	if ((lines > curr_buff->last_line) && (mark_text))
	{
		if (*direction == 'u')
		{
			i = 0;
			while ((i<lines) && (curr_buff->curr_line->prev_line != NULL))
			{
				fast_line("u");
				i++;
			}
			while (curr_buff->position > 1)
				fast_left();
		}
		else
		{
			for (i=0; (i < lines) && (curr_buff->curr_line->next_line != NULL); i++)
				fast_line("d");
		}
		curr_buff->pointer = curr_buff->curr_line->line;
		curr_buff->abs_pos = curr_buff->scr_pos = curr_buff->scr_horz = 0;
		curr_buff->position = 1;
		if (curr_buff->curr_line->next_line == NULL)
			midscreen(curr_buff->last_line, curr_buff->position);
		else
			midscreen(curr_buff->last_line/2, curr_buff->position);
	}
	else if ((lines > curr_buff->last_line) && (!mark_text))
	{
		if (*direction == 'u')
		{
			i = 0;

			if (curr_buff->curr_line->changed && curr_buff->journalling)
				write_journal(curr_buff, curr_buff->curr_line);

			while ((i<lines) && (curr_buff->curr_line->prev_line != NULL))
			{
				curr_buff->curr_line = curr_buff->curr_line->prev_line;
				i++;
			}
			curr_buff->absolute_lin -= i;
		}
		else
		{
			i = 0;

			if (curr_buff->curr_line->changed && curr_buff->journalling)
				write_journal(curr_buff, curr_buff->curr_line);

			while ((i<lines) && (curr_buff->curr_line->next_line != NULL))
			{
				curr_buff->curr_line = curr_buff->curr_line->next_line;
				i++;
			}
			curr_buff->absolute_lin += i;
		}
		curr_buff->pointer = curr_buff->curr_line->line;
		curr_buff->abs_pos = curr_buff->scr_pos = curr_buff->scr_horz = 0;
		curr_buff->position = 1;
		if (curr_buff->curr_line->next_line == NULL)
			midscreen(curr_buff->last_line, curr_buff->position);
		else
			midscreen(curr_buff->last_line/2, curr_buff->position);
	}
	else
	{
		if (*direction == 'u')
		{
			while (curr_buff->position != 1)
				left(TRUE);
			curr_buff->abs_pos = curr_buff->scr_pos = curr_buff->scr_horz;
			for (i = 0; (i < lines) && (curr_buff->curr_line->prev_line != NULL); i++)
				up();
			if ((curr_buff->last_line > 5) && ( curr_buff->scr_vert < 4))
			{
				tmp = curr_buff->pointer;
				tmp_line = curr_buff->curr_line;
				slct_flag = mark_text;
				mark_text = FALSE;
				tmp_paste = cpste_line;
				i  = j = 0;
				m = curr_buff->scr_vert;
				while ((i < 5) && (tmp_line->prev_line != NULL))
				{
					tmp_line = tmp_line->prev_line;
					i += tmp_line->vert_len;
					j++;
					m -=tmp_line->vert_len;
				}
				if ((curr_buff->scr_vert - m) > 5)
					m = curr_buff->scr_vert - 5;
				if (i > 5)
					curr_buff->scr_vert = 5;
				else
					curr_buff->scr_vert = i;
				i = -m;
				wmove(curr_buff->win, 0,0);
				for (value=0; value<i; value++)
					winsertln(curr_buff->win);
				i = curr_buff->scr_vert;
				tmp_line = curr_buff->curr_line;
				for (value=0; value<j; value++)
				{
					curr_buff->curr_line = curr_buff->curr_line->prev_line;
					curr_buff->pointer = curr_buff->curr_line->line;
					i -= curr_buff->curr_line->vert_len;
					m += curr_buff->curr_line->vert_len;
					if ((slct_flag) && (cpste_line->prev_line != NULL))
					{
						cpste_line = cpste_line->prev_line;
						wstandout(curr_buff->win);
					}
					draw_line(i, 0, curr_buff->pointer, 1, curr_buff->curr_line);
					wstandend(curr_buff->win);
				}
				curr_buff->curr_line = tmp_line;
				cpste_line = tmp_paste;
				curr_buff->pointer = tmp;
				mark_text = slct_flag;
				curr_buff->scr_horz = scanline(curr_buff->curr_line, curr_buff->position);
			}
		}
		else
		{
			adv_line();
			for (i = 1; (i < lines) && (curr_buff->curr_line->next_line != NULL); i++)
				down();
			if ((curr_buff->last_line > 10) && (curr_buff->scr_vert > (curr_buff->last_line - 5)) && (curr_buff->curr_line->next_line != NULL))
			{
				tmp = curr_buff->pointer;
				tmp_line = curr_buff->curr_line;
				slct_flag = mark_text;
				mark_text = FALSE;
				tmp_paste = cpste_line;
				j = 1;
				i = curr_buff->curr_line->vert_len - 1;
				while ((i < 5) && (tmp_line->next_line != NULL))
				{
					tmp_line = tmp_line->next_line;
					i += tmp_line->vert_len;
					j++;
				}
				if (i > 5)
					i = 5;
				m = i;
				i = (curr_buff->scr_vert + i ) - curr_buff->last_line;
				if (i > 0)
					curr_buff->scr_vert = curr_buff->last_line - m;
				wmove(curr_buff->win, 0, 0);
				for (value=0; value<i; value++)
					wdeleteln(curr_buff->win);
				tmp_line = curr_buff->curr_line;
				i = curr_buff->scr_vert;
				for (value=0; value<j; value++)
				{
					if ((slct_flag) && (cpste_line->next_line != NULL))
					{
						cpste_line = cpste_line->next_line;
						wstandout(curr_buff->win);
					}
					draw_line(i, 0, curr_buff->pointer, 1, curr_buff->curr_line);
					i += curr_buff->curr_line->vert_len;
					wstandend(curr_buff->win);
					curr_buff->curr_line = curr_buff->curr_line->next_line;
					if (curr_buff->curr_line != NULL)
						curr_buff->pointer = curr_buff->curr_line->line;
				}
				curr_buff->curr_line = tmp_line;
				cpste_line = tmp_paste;
				curr_buff->pointer = tmp;
				mark_text = slct_flag;
				curr_buff->scr_horz = 0;
			}
		}
	}
	wmove(curr_buff->win, curr_buff->scr_vert, curr_buff->scr_horz);
}
	
void 
eol()		/* go to end of current line			*/
{
	int e;

	if ((curr_buff->position == curr_buff->curr_line->line_length) && (curr_buff->curr_line->next_line != NULL))
		right(TRUE);

	e = (curr_buff->curr_line->vert_len - (scanline(curr_buff->curr_line, curr_buff->position) / COLS)) - 1;

	if (mark_text)
	{
		while (curr_buff->position != curr_buff->curr_line->line_length)
			fast_right();
	}
	else
	{
		curr_buff->position = curr_buff->curr_line->line_length;
		curr_buff->abs_pos = curr_buff->scr_pos = scanline(curr_buff->curr_line, curr_buff->position);
		curr_buff->scr_horz = curr_buff->scr_pos % COLS;
	}
	curr_buff->scr_vert += e;
	if (curr_buff->scr_vert > curr_buff->last_line)
	{
		curr_buff->scr_vert = curr_buff->last_line;
		midscreen(curr_buff->scr_vert, curr_buff->position);
	}
	else if (mark_text)
		midscreen(curr_buff->scr_vert, curr_buff->position);
	else
	{
		curr_buff->pointer = &(curr_buff->curr_line->line[curr_buff->position - 1]);
		wmove(curr_buff->win, curr_buff->scr_vert, curr_buff->scr_horz);
	}
}

void 
bol()			/* move to beginning of current line	*/
{
	int b;

	b = scanline(curr_buff->curr_line, curr_buff->position) / COLS;
	if (curr_buff->position != 1)
	{
		if (mark_text)
		{
			while (curr_buff->position != 1)
				fast_left();
		}
		else
		{
			curr_buff->position = 1;
			curr_buff->scr_horz = curr_buff->scr_pos = 0;
			curr_buff->pointer = curr_buff->curr_line->line;
		}

		curr_buff->abs_pos = 0;

		if ((curr_buff->scr_vert - b) < 0)
		{
			curr_buff->scr_vert = 0;
			midscreen(0, curr_buff->position);
		}
		else
		{
			curr_buff->scr_vert -= b;
			if (mark_text)
				midscreen(curr_buff->scr_vert, curr_buff->position);
			else
				wmove(curr_buff->win, curr_buff->scr_vert, curr_buff->scr_horz);
		}
	}
	else if (curr_buff->curr_line->prev_line != NULL)
	{
		curr_buff->abs_pos = 0;
		up();
	}
}

void 
adv_line()	/* advance to beginning of next line	*/
{
	curr_buff->abs_pos = 0;
	if (curr_buff->position == 1)
		down();
	else
	{
		if (curr_buff->position < curr_buff->curr_line->line_length)
			eol();
		right(TRUE);
	}
}

/*
 |	move cursor to the next page
 */

void 
next_page()
{
	int counter = 0;
	int vlength;
	int tmp_vert = curr_buff->scr_vert;
	struct text *tmp_line;
	char done = FALSE;

	if (curr_buff->curr_line->changed && curr_buff->journalling)
		write_journal(curr_buff, curr_buff->curr_line);

	vlength = 
	   (curr_buff->curr_line->vert_len - (scanline(curr_buff->curr_line, curr_buff->position) / COLS)) - 1;
	tmp_line = curr_buff->curr_line;
	while ((curr_buff->curr_line->next_line != NULL) && (counter < curr_buff->last_line) && (!done))
	{
		if ((curr_buff->curr_line->vert_len + counter - vlength) <= curr_buff->last_line)
		{
			counter += curr_buff->curr_line->vert_len - vlength;
			adv_line();
		}
		else
			done = TRUE;

		vlength = 0;
	}

	if (counter == 0)
	{
		if (curr_buff->curr_line->next_line != NULL)
			adv_line();
	}

	if (curr_buff->curr_line->next_line != NULL)
		midscreen(tmp_vert, 0);
}

/*
 |	move the cursor to the previous page
 */

void 
prev_page()
{
	int counter = 0;
	int vlength;
	int tmp_vert = curr_buff->scr_vert;
	struct text *tmp_line;
	char done = FALSE;

	if (curr_buff->curr_line->changed && curr_buff->journalling)
		write_journal(curr_buff, curr_buff->curr_line);

	vlength = (scanline(curr_buff->curr_line, curr_buff->position) / COLS);
	tmp_line = curr_buff->curr_line;
	while ((curr_buff->curr_line->prev_line != NULL) && (counter < curr_buff->last_line) && (!done))
	{
		if ((curr_buff->curr_line->vert_len + counter - vlength) <= curr_buff->last_line)
		{
			counter += curr_buff->curr_line->vert_len - vlength;
			if (curr_buff->position != 1)
				bol();
			bol();
		}
		else
			done = TRUE;

		vlength = 0;
	}

	if (counter == 0)
	{
		if (curr_buff->curr_line->prev_line != NULL)
		{
			if (curr_buff->position != 1)
				bol();
			bol();
		}
	}

	midscreen(tmp_vert, 0);
}