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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
docs/rc.xml.all
View file

@ -18,6 +18,11 @@
<placement>
<policy>center</policy>
<!--
When <placement><policy> is "cascade", the offset for cascading new
windows can be overwritten like this:
<cascadeOffset x="40" y="30" />
-->
</placement>
<!-- <font><theme> can be defined without an attribute to set all places -->