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Add an "absolute-centre" alignment to use the centre of the total space

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instead of only the available space. From Magnus Gross in GitHub issue 2578.
This commit is contained in:
nicm
2021-03-11 06:41:04 +00:00
parent d98f9f7fe5
commit 3eb91efba1
5 changed files with 199 additions and 31 deletions
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214
format-draw.c
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@@ -157,13 +157,14 @@ format_draw_put_list(struct screen_write_ctx *octx,
static void
format_draw_none(struct screen_write_ctx *octx, u_int available, u_int ocx,
u_int ocy, struct screen *left, struct screen *centre, struct screen *right,
struct format_ranges *frs)
struct screen *abs_centre, struct format_ranges *frs)
{
u_int width_left, width_centre, width_right;
u_int width_left, width_centre, width_right, width_abs_centre;
width_left = left->cx;
width_centre = centre->cx;
width_right = right->cx;
width_abs_centre = abs_centre->cx;
/*
* Try to keep as much of the left and right as possible at the expense
@@ -199,23 +200,34 @@ format_draw_none(struct screen_write_ctx *octx, u_int available, u_int ocx,
- width_centre / 2,
centre->cx / 2 - width_centre / 2,
width_centre);
/*
* Write abs_centre in the perfect centre of all horizontal space.
*/
if (width_abs_centre > available)
width_abs_centre = available;
format_draw_put(octx, ocx, ocy, abs_centre, frs,
(available - width_abs_centre) / 2,
0,
width_abs_centre);
}
/* Draw format with list on the left. */
static void
format_draw_left(struct screen_write_ctx *octx, u_int available, u_int ocx,
u_int ocy, struct screen *left, struct screen *centre, struct screen *right,
struct screen *list, struct screen *list_left, struct screen *list_right,
struct screen *after, int focus_start, int focus_end,
struct format_ranges *frs)
struct screen *abs_centre, struct screen *list, struct screen *list_left,
struct screen *list_right, struct screen *after, int focus_start,
int focus_end, struct format_ranges *frs)
{
u_int width_left, width_centre, width_right;
u_int width_list, width_after;
u_int width_list, width_after, width_abs_centre;
struct screen_write_ctx ctx;
width_left = left->cx;
width_centre = centre->cx;
width_right = right->cx;
width_abs_centre = abs_centre->cx;
width_list = list->cx;
width_after = after->cx;
@@ -247,7 +259,7 @@ format_draw_left(struct screen_write_ctx *octx, u_int available, u_int ocx,
screen_write_stop(&ctx);
format_draw_none(octx, available, ocx, ocy, left, centre,
right, frs);
right, abs_centre, frs);
return;
}
@@ -291,23 +303,34 @@ format_draw_left(struct screen_write_ctx *octx, u_int available, u_int ocx,
focus_start = focus_end = 0;
format_draw_put_list(octx, ocx, ocy, width_left, width_list, list,
list_left, list_right, focus_start, focus_end, frs);
/*
* Write abs_centre in the perfect centre of all horizontal space.
*/
if (width_abs_centre > available)
width_abs_centre = available;
format_draw_put(octx, ocx, ocy, abs_centre, frs,
(available - width_abs_centre) / 2,
0,
width_abs_centre);
}
/* Draw format with list in the centre. */
static void
format_draw_centre(struct screen_write_ctx *octx, u_int available, u_int ocx,
u_int ocy, struct screen *left, struct screen *centre, struct screen *right,
struct screen *list, struct screen *list_left, struct screen *list_right,
struct screen *after, int focus_start, int focus_end,
struct format_ranges *frs)
struct screen *abs_centre, struct screen *list, struct screen *list_left,
struct screen *list_right, struct screen *after, int focus_start,
int focus_end, struct format_ranges *frs)
{
u_int width_left, width_centre, width_right;
u_int width_list, width_after, middle;
u_int width_left, width_centre, width_right, middle;
u_int width_list, width_after, width_abs_centre;
struct screen_write_ctx ctx;
width_left = left->cx;
width_centre = centre->cx;
width_right = right->cx;
width_abs_centre = abs_centre->cx;
width_list = list->cx;
width_after = after->cx;
@@ -339,7 +362,7 @@ format_draw_centre(struct screen_write_ctx *octx, u_int available, u_int ocx,
screen_write_stop(&ctx);
format_draw_none(octx, available, ocx, ocy, left, centre,
right, frs);
right, abs_centre, frs);
return;
}
@@ -388,23 +411,34 @@ format_draw_centre(struct screen_write_ctx *octx, u_int available, u_int ocx,
format_draw_put_list(octx, ocx, ocy, middle - width_list / 2,
width_list, list, list_left, list_right, focus_start, focus_end,
frs);
/*
* Write abs_centre in the perfect centre of all horizontal space.
*/
if (width_abs_centre > available)
width_abs_centre = available;
format_draw_put(octx, ocx, ocy, abs_centre, frs,
(available - width_abs_centre) / 2,
0,
width_abs_centre);
}
/* Draw format with list on the right. */
static void
format_draw_right(struct screen_write_ctx *octx, u_int available, u_int ocx,
u_int ocy, struct screen *left, struct screen *centre, struct screen *right,
struct screen *list, struct screen *list_left, struct screen *list_right,
struct screen *after, int focus_start, int focus_end,
struct format_ranges *frs)
struct screen *abs_centre, struct screen *list,
struct screen *list_left, struct screen *list_right, struct screen *after,
int focus_start, int focus_end, struct format_ranges *frs)
{
u_int width_left, width_centre, width_right;
u_int width_list, width_after;
u_int width_list, width_after, width_abs_centre;
struct screen_write_ctx ctx;
width_left = left->cx;
width_centre = centre->cx;
width_right = right->cx;
width_abs_centre = abs_centre->cx;
width_list = list->cx;
width_after = after->cx;
@@ -436,7 +470,7 @@ format_draw_right(struct screen_write_ctx *octx, u_int available, u_int ocx,
screen_write_stop(&ctx);
format_draw_none(octx, available, ocx, ocy, left, centre,
right, frs);
right, abs_centre, frs);
return;
}
@@ -484,6 +518,118 @@ format_draw_right(struct screen_write_ctx *octx, u_int available, u_int ocx,
format_draw_put_list(octx, ocx, ocy, available - width_list -
width_after, width_list, list, list_left, list_right, focus_start,
focus_end, frs);
/*
* Write abs_centre in the perfect centre of all horizontal space.
*/
if (width_abs_centre > available)
width_abs_centre = available;
format_draw_put(octx, ocx, ocy, abs_centre, frs,
(available - width_abs_centre) / 2,
0,
width_abs_centre);
}
static void
format_draw_absolute_centre(struct screen_write_ctx *octx, u_int available,
u_int ocx, u_int ocy, struct screen *left, struct screen *centre,
struct screen *right, struct screen *abs_centre, struct screen *list,
struct screen *list_left, struct screen *list_right, struct screen *after,
int focus_start, int focus_end, struct format_ranges *frs)
{
u_int width_left, width_centre, width_right, width_abs_centre;
u_int width_list, width_after, middle, abs_centre_offset;
width_left = left->cx;
width_centre = centre->cx;
width_right = right->cx;
width_abs_centre = abs_centre->cx;
width_list = list->cx;
width_after = after->cx;
/*
* Trim first centre, then the right, then the left.
*/
while (width_left +
width_centre +
width_right > available) {
if (width_centre > 0)
width_centre--;
else if (width_right > 0)
width_right--;
else
width_left--;
}
/*
* We trim list after and abs_centre independently, as we are drawing
* them over the rest. Trim first the list, then after the list, then
* abs_centre.
*/
while (width_list + width_after + width_abs_centre > available) {
if (width_list > 0)
width_list--;
else if (width_after > 0)
width_after--;
else
width_abs_centre--;
}
/* Write left at 0. */
format_draw_put(octx, ocx, ocy, left, frs, 0, 0, width_left);
/* Write right at available - width_right. */
format_draw_put(octx, ocx, ocy, right, frs,
available - width_right,
right->cx - width_right,
width_right);
/*
* Keep writing centre at the relative centre. Only the list is written
* in the absolute centre of the horizontal space.
*/
middle = (width_left + ((available - width_right) - width_left) / 2);
/*
* Write centre at
* middle - width_centre.
*/
format_draw_put(octx, ocx, ocy, centre, frs,
middle - width_centre,
0,
width_centre);
/*
* If there is no focus given, keep the centre in focus.
*/
if (focus_start == -1 || focus_end == -1)
focus_start = focus_end = list->cx / 2;
/*
* We centre abs_centre and the list together, so their shared centre is
* in the perfect centre of horizontal space.
*/
abs_centre_offset = (available - width_list - width_abs_centre) / 2;
/*
* Write abs_centre before the list.
*/
format_draw_put(octx, ocx, ocy, abs_centre, frs, abs_centre_offset,
0, width_abs_centre);
abs_centre_offset += width_abs_centre;
/*
* Draw the list in the absolute centre
*/
format_draw_put_list(octx, ocx, ocy, abs_centre_offset, width_list,
list, list_left, list_right, focus_start, focus_end, frs);
abs_centre_offset += width_list;
/*
* Write after at the end of the centre
*/
format_draw_put(octx, ocx, ocy, after, frs, abs_centre_offset, 0,
width_after);
}
/* Draw multiple characters. */
@@ -506,6 +652,7 @@ format_draw(struct screen_write_ctx *octx, const struct grid_cell *base,
enum { LEFT,
CENTRE,
RIGHT,
ABSOLUTE_CENTRE,
LIST,
LIST_LEFT,
LIST_RIGHT,
@@ -514,6 +661,7 @@ format_draw(struct screen_write_ctx *octx, const struct grid_cell *base,
const char *names[] = { "LEFT",
"CENTRE",
"RIGHT",
"ABSOLUTE_CENTRE",
"LIST",
"LIST_LEFT",
"LIST_RIGHT",
@@ -522,7 +670,11 @@ format_draw(struct screen_write_ctx *octx, const struct grid_cell *base,
struct screen *os = octx->s, s[TOTAL];
struct screen_write_ctx ctx[TOTAL];
u_int ocx = os->cx, ocy = os->cy, n, i, width[TOTAL];
u_int map[] = { LEFT, LEFT, CENTRE, RIGHT };
u_int map[] = { LEFT,
LEFT,
CENTRE,
RIGHT,
ABSOLUTE_CENTRE };
int focus_start = -1, focus_end = -1;
int list_state = -1, fill = -1, even;
enum style_align list_align = STYLE_ALIGN_DEFAULT;
@@ -789,25 +941,35 @@ format_draw(struct screen_write_ctx *octx, const struct grid_cell *base,
case STYLE_ALIGN_DEFAULT:
/* No list. */
format_draw_none(octx, available, ocx, ocy, &s[LEFT],
&s[CENTRE], &s[RIGHT], &frs);
&s[CENTRE], &s[RIGHT], &s[ABSOLUTE_CENTRE], &frs);
break;
case STYLE_ALIGN_LEFT:
/* List is part of the left. */
format_draw_left(octx, available, ocx, ocy, &s[LEFT],
&s[CENTRE], &s[RIGHT], &s[LIST], &s[LIST_LEFT],
&s[LIST_RIGHT], &s[AFTER], focus_start, focus_end, &frs);
&s[CENTRE], &s[RIGHT], &s[ABSOLUTE_CENTRE], &s[LIST],
&s[LIST_LEFT], &s[LIST_RIGHT], &s[AFTER],
focus_start, focus_end, &frs);
break;
case STYLE_ALIGN_CENTRE:
/* List is part of the centre. */
format_draw_centre(octx, available, ocx, ocy, &s[LEFT],
&s[CENTRE], &s[RIGHT], &s[LIST], &s[LIST_LEFT],
&s[LIST_RIGHT], &s[AFTER], focus_start, focus_end, &frs);
&s[CENTRE], &s[RIGHT], &s[ABSOLUTE_CENTRE], &s[LIST],
&s[LIST_LEFT], &s[LIST_RIGHT], &s[AFTER],
focus_start, focus_end, &frs);
break;
case STYLE_ALIGN_RIGHT:
/* List is part of the right. */
format_draw_right(octx, available, ocx, ocy, &s[LEFT],
&s[CENTRE], &s[RIGHT], &s[LIST], &s[LIST_LEFT],
&s[LIST_RIGHT], &s[AFTER], focus_start, focus_end, &frs);
&s[CENTRE], &s[RIGHT], &s[ABSOLUTE_CENTRE], &s[LIST],
&s[LIST_LEFT], &s[LIST_RIGHT], &s[AFTER],
focus_start, focus_end, &frs);
break;
case STYLE_ALIGN_ABSOLUTE_CENTRE:
/* List is in the centre of the entire horizontal space. */
format_draw_absolute_centre(octx, available, ocx, ocy, &s[LEFT],
&s[CENTRE], &s[RIGHT], &s[ABSOLUTE_CENTRE], &s[LIST],
&s[LIST_LEFT], &s[LIST_RIGHT], &s[AFTER],
focus_start, focus_end, &frs);
break;
}