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view: implement cascade placement policy

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Adds following settings:
<placement>
  <policy>cascade</policy>
  <cascadeOffset x="40" y="30" />
</placement>

"Cascade" policy places a new window at the center of the screen like
"center" policy, but possibly shifts its position to bottom-right so the
new window doesn't cover existing windows.

The algorithm is copied from KWin's implementation:
df9f8f8346/src/placement.cpp (L589)

Also added some helper functions to manipulate `wlr_box`.
This commit is contained in:
tokyo4j 2024-05-04 06:26:27 +09:00 • committed by Johan Malm
parent 3be8fe25f3
commit 46ec513630
10 changed files with 199 additions and 17 deletions
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6
src/edges.c
View file

@ -5,6 +5,7 @@
#include <wlr/util/edges.h>
#include <wlr/util/box.h>
#include "common/border.h"
#include "common/box.h"
#include "common/macros.h"
#include "config/rcxml.h"
#include "edges.h"
@ -466,9 +467,8 @@ edges_find_outputs(struct border *nearest_edges, struct view *view,
struct wlr_box usable =
output_usable_area_in_layout_coords(o);
struct wlr_box ol;
if (!wlr_box_intersection(&ol, &origin, &usable) &&
!wlr_box_intersection(&ol, &target, &usable)) {
if (!box_intersects(&origin, &usable)
&& !box_intersects(&target, &usable)) {
continue;
}