static off_t
begin_paragraph (WEdit * edit, gboolean force)
{
long i;
for (i = edit->buffer.curs_line - 1; i >= 0; i--)
if (edit_line_is_blank (edit, i) ||
(force && bad_line_start (&edit->buffer, line_start (&edit->buffer, i))))
{
i++;
break;
}
return edit_buffer_move_backward (&edit->buffer, edit_buffer_get_current_bol (&edit->buffer),
edit->buffer.curs_line - i);
}
static off_t
line_start (const edit_buffer_t * buf, long line)
{
off_t p;
long l;
l = buf->curs_line;
p = buf->curs1;
if (line < l)
p = edit_buffer_move_backward (buf, p, l - line);
else if (line > l)
p = edit_buffer_move_forward (buf, p, line - l, 0);
p = edit_buffer_get_bol (buf, p);
while (strchr ("\t ", edit_buffer_get_byte (buf, p)) != NULL)
p++;
return p;
}
static inline void
render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
{
static long prev_curs_row = 0;
static off_t prev_curs = 0;
Widget *w = WIDGET (edit);
Widget *wh = WIDGET (w->owner);
int force = edit->force;
int y1, x1, y2, x2;
int last_line;
int last_column;
/* draw only visible region */
last_line = wh->y + wh->lines - 1;
y1 = w->y;
if (y1 > last_line - 1 /* buttonbar */ )
return;
last_column = wh->x + wh->cols - 1;
x1 = w->x;
if (x1 > last_column)
return;
y2 = w->y + w->lines - 1;
if (y2 < wh->y + 1 /* menubar */ )
return;
x2 = w->x + w->cols - 1;
if (x2 < wh->x)
return;
if ((force & REDRAW_IN_BOUNDS) == 0)
{
/* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
/* draw only visible region */
if (y2 <= last_line - 1 /* buttonbar */ )
end_row = w->lines - 1;
else if (y1 >= wh->y + 1 /* menubar */ )
end_row = wh->lines - 1 - y1 - 1;
else
end_row = start_row + wh->lines - 1 - 1;
if (x2 <= last_column)
end_column = w->cols - 1;
else if (x1 >= wh->x)
end_column = wh->cols - 1 - x1;
else
end_column = start_column + wh->cols - 1;
}
/*
* If the position of the page has not moved then we can draw the cursor
* character only. This will prevent line flicker when using arrow keys.
*/
if ((force & REDRAW_CHAR_ONLY) == 0 || (force & REDRAW_PAGE) != 0)
{
long row = 0;
long b;
if ((force & REDRAW_PAGE) != 0)
{
row = start_row;
b = edit_buffer_move_forward (&edit->buffer, edit->start_display, start_row, 0);
while (row <= end_row)
{
if (key_pending (edit))
return;
edit_draw_this_line (edit, b, row, start_column, end_column);
b = edit_buffer_move_forward (&edit->buffer, b, 1, 0);
row++;
}
}
else
{
long curs_row = edit->curs_row;
if ((force & REDRAW_BEFORE_CURSOR) != 0 && start_row < curs_row)
{
long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
row = start_row;
b = edit->start_display;
while (row <= upto)
{
if (key_pending (edit))
return;
edit_draw_this_line (edit, b, row, start_column, end_column);
b = edit_buffer_move_forward (&edit->buffer, b, 1, 0);
}
}
/* if (force & REDRAW_LINE) ---> default */
b = edit_buffer_get_current_bol (&edit->buffer);
if (curs_row >= start_row && curs_row <= end_row)
{
if (key_pending (edit))
return;
edit_draw_this_line (edit, b, curs_row, start_column, end_column);
}
if ((force & REDRAW_AFTER_CURSOR) != 0 && end_row > curs_row)
{
row = curs_row + 1 < start_row ? start_row : curs_row + 1;
b = edit_buffer_move_forward (&edit->buffer, b, 1, 0);
while (row <= end_row)
{
if (key_pending (edit))
return;
edit_draw_this_line (edit, b, row, start_column, end_column);
b = edit_buffer_move_forward (&edit->buffer, b, 1, 0);
row++;
}
}
if ((force & REDRAW_LINE_ABOVE) != 0 && curs_row >= 1)
{
row = curs_row - 1;
b = edit_buffer_move_backward (&edit->buffer,
edit_buffer_get_current_bol (&edit->buffer), 1);
if (row >= start_row && row <= end_row)
{
if (key_pending (edit))
return;
edit_draw_this_line (edit, b, row, start_column, end_column);
}
}
if ((force & REDRAW_LINE_BELOW) != 0 && row < w->lines - 1)
{
row = curs_row + 1;
b = edit_buffer_get_current_bol (&edit->buffer);
b = edit_buffer_move_forward (&edit->buffer, b, 1, 0);
if (row >= start_row && row <= end_row)
{
if (key_pending (edit))
return;
edit_draw_this_line (edit, b, row, start_column, end_column);
}
}
}
}
else if (prev_curs_row < edit->curs_row)
{
/* with the new text highlighting, we must draw from the top down */
edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
edit_draw_this_char (edit, edit->buffer.curs1, edit->curs_row, start_column, end_column);
}
else
{
edit_draw_this_char (edit, edit->buffer.curs1, edit->curs_row, start_column, end_column);
edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
}
edit->force = 0;
prev_curs_row = edit->curs_row;
prev_curs = edit->buffer.curs1;
}
