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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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5
include/config/rcxml.h
View file

@ -20,7 +20,8 @@ enum view_placement_policy {
LAB_PLACE_INVALID = 0,
LAB_PLACE_CENTER,
LAB_PLACE_CURSOR,
LAB_PLACE_AUTOMATIC
LAB_PLACE_AUTOMATIC,
LAB_PLACE_CASCADE,
};
enum adaptive_sync_mode {
@ -57,6 +58,8 @@ struct rcxml {
bool reuse_output_mode;
enum view_placement_policy placement_policy;
bool xwayland_persistence;
int placement_cascade_offset_x;
int placement_cascade_offset_y;
/* focus */
bool focus_follow_mouse;