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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
parent 9e9c29d7f5
commit 2a81f391c0
10 changed files with 199 additions and 17 deletions
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14
docs/labwc-config.5.scd
View file

@ -203,12 +203,22 @@ this is for compatibility with Openbox.
## PLACEMENT
*<placement><policy>* [center|automatic|cursor]
*<placement><policy>* [center|automatic|cursor|cascade]
Specify a placement policy for new windows. The "center" policy will
always place windows at the center of the active output. The "automatic"
policy will try to place new windows in such a way that they will
have minimal overlap with existing windows. The "cursor" policy will
center new windows under the cursor. Default is "center".
center new windows under the cursor. The "cascade" policy will try to
place new windows at the center of the active output, but possibly
shifts its position to bottom-right not to cover existing windows.
Default is "center".
*<placement><cascadeOffset><x>*++
*<placement><cascadeOffset><y>*
Specify the offset by which a new window can be shifted from an existing
window when <placement><policy> is "cascade". These values must be positive.
Default is the height of titlebar (the sum of *titlebar.height* and
*border.width* from theme) plus 5 for both *x* and *y*.
## WINDOW SWITCHER