Is it possible to write a rule to enable shadows for a particular application?

[ghost]

In a nutshell, I want to enable shadows only for System Preferences and Preview.

[koekeishiya]

Added support on master for querying the value of a windows shadow and the ability to toggle shadow on or off. That should be enough for you to do what you want through the signal system.

[dominiklohmann]

@koekeishiya you forgot the docs

@danteissaias this should do (edit: just filed #174, window_created has a bug that affects this)

# disable window shadows for all windows
yabai -m config window_shadow off

# toggle shadows when a window is created for system prefs or preview
yabai -m signal --add event=window_created  app='^(System Preferences|Preview)$' \
    action='yabai -m window "${YABAI_WINDOW_ID}" --toggle shadow'

# toggle shadows for all existing system prefs or preview windows when yabai launches
yabai -m query --windows \
    | jq '.[] | select(.shadow == 0 and (.app == "System Preferences" or .app == "Preview")).id' \
    | xargs -I{} yabai -m window {} --toggle shadow

[ghost]

Is it possible to make these two work together, since toggling floating also re-disables shadows?

yabai -m signal --add event=window_created  app='^(System Preferences|Preview)$' \
    action='yabai -m window "${YABAI_WINDOW_ID}" --toggle shadow'
yabai -m signal --add event=window_created  app='^(System Preferences|Preview)$' \
    action='yabai -m window "${YABAI_WINDOW_ID}" --toggle floating'

Edit: This issue only affects System Preferences, and not Preview.
Edit 2: I now realize this is the #174 bug.

[koekeishiya]

I don't consider 174 to be a bug. You need to also subscribe to the application_launched signal.