Feature: window policies (defaults and override per window/clients)

Hello folks,


I'd like to announce a new feature for Xfwm4 that I've implemented
recently: window policies.

Rationale: in some cases one wants to override default behavours for
specific clients.

For example, you want some application to always appear at on a specific
position (maybe a separate monitor). Another neat example is enforcing
borders around windows that usually don't have any.

Policies can be configured quite easily via xfconf (xfwm4 channel):


<channel name="xfwm4" version="1.0">
   ...
   <property name="policies" type="array">
     <property name="XTerm.xterm.*._NET_WM_WINDOW_TYPE_NORMAL" type="array">
       <property name="placement.geometry" type="string" value="=100x100"/>
     </property>
     <property name="XTerm.xterm.*.*" type="array">
       <property name="placement.midpoint" type="string" value="2266x540"/>
     </property>
     <property name="XEyes.xeyes.*.*" type="array">
       <property name="force.border"        type="bool"   value="true"/>
     </property>
   </property>
   ...
</channel>

The property name is constructed from window class, window class name,
window name and window type, separated by dot. Asterisks match to any
value.

Currently defined policy attributes:

* placement.geometry: initial window geometry in standard X notation
   (see XParseGeometry())
* placement.midpoint: initial position by window's midpoint
   (format <x-pos> + "x" <y-pos>)
* force.border: enforce the window to always have border


Here's my merge request:
https://gitlab.xfce.org/xfce/xfwm4/-/merge_requests/55

If you like it, feel free to leave your thumb up :)


--mtx


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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
[email protected] -- +49-151-27565287
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