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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/config/rcxml.c
View file

@ -901,6 +901,10 @@ entry(xmlNode *node, char *nodename, char *content)
}
} else if (!strcasecmp(nodename, "xwaylandPersistence.core")) {
set_bool(content, &rc.xwayland_persistence);
} else if (!strcasecmp(nodename, "x.cascadeOffset.placement")) {
rc.placement_cascade_offset_x = atoi(content);
} else if (!strcasecmp(nodename, "y.cascadeOffset.placement")) {
rc.placement_cascade_offset_y = atoi(content);
} else if (!strcmp(nodename, "name.theme")) {
rc.theme_name = xstrdup(content);
} else if (!strcmp(nodename, "cornerradius.theme")) {
@ -1234,6 +1238,8 @@ rcxml_init(void)
has_run = true;
rc.placement_policy = LAB_PLACE_CENTER;
rc.placement_cascade_offset_x = 0;
rc.placement_cascade_offset_y = 0;
rc.xdg_shell_server_side_deco = true;
rc.ssd_keep_border = true;