static long
line_start (WEdit *edit, long line)
{
long p, l;
l = edit->curs_line;
p = edit->curs1;
if (line < l)
p = edit_move_backward (edit, p, l - line);
else if (line > l)
p = edit_move_forward (edit, p, line - l, 0);
p = edit_bol (edit, p);
while (strchr ("\t ", edit_get_byte (edit, p)))
p++;
return p;
}
/*
* Find the start of the current paragraph for the purpose of formatting.
* Return position in the file.
*/
static long
begin_paragraph (WEdit *edit, int force)
{
int i;
for (i = edit->curs_line - 1; i >= 0; i--) {
if (line_is_blank (edit, i)) {
i++;
break;
}
if (force) {
if (bad_line_start (edit, line_start (edit, i))) {
i++;
break;
}
}
}
return edit_move_backward (edit, edit_bol (edit, edit->curs1),
edit->curs_line - i);
}
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 long prev_curs = 0;
Widget *w = (Widget *) edit;
Dlg_head *h = w->owner;
long row = 0, curs_row;
int force = edit->force;
long b;
int y1, x1, y2, x2;
int last_line;
int last_column;
/* draw only visible region */
last_line = h->y + h->lines - 1;
y1 = w->y;
if (y1 > last_line - 1 /* buttonbar */ )
return;
last_column = h->x + h->cols - 1;
x1 = w->x;
if (x1 > last_column)
return;
y2 = w->y + w->lines - 1;
if (y2 < h->y + 1 /* menubar */ )
return;
x2 = w->x + w->cols - 1;
if (x2 < h->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 >= h->y + 1 /* menubar */ )
end_row = h->lines - 1 - y1 - 1;
else
end_row = start_row + h->lines - 1 - 1;
if (x2 <= last_column)
end_column = w->cols - 1;
else if (x1 >= h->x)
end_column = h->cols - 1 - x1;
else
end_column = start_column + h->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)
{
if ((force & REDRAW_PAGE) != 0)
{
row = start_row;
b = edit_move_forward (edit, 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_move_forward (edit, b, 1, 0);
row++;
}
}
else
{
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_move_forward (edit, b, 1, 0);
}
}
/* if (force & REDRAW_LINE) ---> default */
b = edit_bol (edit, edit->curs1);
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_move_forward (edit, 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_move_forward (edit, b, 1, 0);
row++;
}
}
if ((force & REDRAW_LINE_ABOVE) != 0 && curs_row >= 1)
{
row = curs_row - 1;
b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 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 < edit->widget.lines - 1)
{
row = curs_row + 1;
b = edit_bol (edit, edit->curs1);
b = edit_move_forward (edit, 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->curs1, edit->curs_row, start_column, end_column);
}
else
{
edit_draw_this_char (edit, edit->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->curs1;
}
/* cursor must be in screen for other than REDRAW_PAGE passed in force */
static void
render_edit_text (WEdit * edit, long start_row, long start_column, long end_row,
long end_column)
{
long row = 0, curs_row;
static int prev_curs_row = 0;
static long prev_curs = 0;
int force = edit->force;
long b;
/*
* 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)) || (force & REDRAW_PAGE)) {
if (!(force & REDRAW_IN_BOUNDS)) { /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
start_row = 0;
end_row = edit->num_widget_lines - 1;
start_column = 0;
end_column = edit->num_widget_columns - 1;
}
if (force & REDRAW_PAGE) {
row = start_row;
b = edit_move_forward (edit, edit->start_display, start_row, 0);
while (row <= end_row) {
if (key_pending (edit))
goto exit_render;
edit_draw_this_line (edit, b, row, start_column, end_column);
b = edit_move_forward (edit, b, 1, 0);
row++;
}
} else {
curs_row = edit->curs_row;
if (force & REDRAW_BEFORE_CURSOR) {
if (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))
goto exit_render;
edit_draw_this_line (edit, b, row, start_column, end_column);
b = edit_move_forward (edit, b, 1, 0);
}
}
}
/* if (force & REDRAW_LINE) ---> default */
b = edit_bol (edit, edit->curs1);
if (curs_row >= start_row && curs_row <= end_row) {
if (key_pending (edit))
goto exit_render;
edit_draw_this_line (edit, b, curs_row, start_column, end_column);
}
if (force & REDRAW_AFTER_CURSOR) {
if (end_row > curs_row) {
row = curs_row + 1 < start_row ? start_row : curs_row + 1;
b = edit_move_forward (edit, b, 1, 0);
while (row <= end_row) {
if (key_pending (edit))
goto exit_render;
edit_draw_this_line (edit, b, row, start_column, end_column);
b = edit_move_forward (edit, b, 1, 0);
row++;
}
}
}
if (force & REDRAW_LINE_ABOVE && curs_row >= 1) {
row = curs_row - 1;
b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
if (row >= start_row && row <= end_row) {
if (key_pending (edit))
goto exit_render;
edit_draw_this_line (edit, b, row, start_column, end_column);
}
}
if (force & REDRAW_LINE_BELOW && row < edit->num_widget_lines - 1) {
row = curs_row + 1;
b = edit_bol (edit, edit->curs1);
b = edit_move_forward (edit, b, 1, 0);
if (row >= start_row && row <= end_row) {
if (key_pending (edit))
goto exit_render;
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);
edit_draw_this_char (edit, edit->curs1, edit->curs_row);
} else {
edit_draw_this_char (edit, edit->curs1, edit->curs_row);
edit_draw_this_char (edit, prev_curs, prev_curs_row);
}
}
edit->force = 0;
prev_curs_row = edit->curs_row;
prev_curs = edit->curs1;
exit_render:
edit->screen_modified = 0;
return;
}
