Re: [ruby-gnome2-devel-en] Is there a Gdk.Window.property_change method ?

[John L. <jo...@la...>]

On 24/02/17 13:44, cedlemo wrote:
> Jhon,
> 
> after looking at the documentation 
> https://developer.gnome.org/gdk3/stable/gdk3-X-Window-System-Interaction.html 
> and at  the Gdk code : 
> https://github.com/GNOME/gtk/blob/master/gdk/x11/gdkwindow-x11.c
> it seems that Gdk does not provide the api you want.
> 
> Can I ask you what do you want to do ? why do you want to set the window 
> manager hints ? Do you really need them ?
> Could you not do what you want with the available api without settings 
> the window manager hints ?
> 

I'm trying to write a dock-like app that puts a bar across the top of
the screen and I want to reserve space for it so that it isn't obscured
by maximised windows.

I have two ways to achieve what I want but I had hoped to be able to use
the Gtk bindings because it would be neater. I also evaluated the Python
Gtk2 bindings (property_change[1]) and that does support this.

Here's what I can do in Ruby:

There is an Xlib API (require 'xlib-objects' [2]) that allows you to do
this:

    topw = XlibObj::Window.new(XlibObj::Display.new(':0')
                                                ,toplevel.window.xid)
    XlibObj::Window::Property.new(topw, '_NET_WM_STRUT').set(
                [0, 0, self.height, 0 ],
                :CARDINAL)
    XlibObj::Window::Property.new(topw, '_NET_WM_STRUT_PARTIAL').set(
                [0, 0, self.height, 0, 0, 0, 0, 0, x, x+width-1, 0, 0],
                :CARDINAL)

The other way is to run xbind[3] in a subshell:

    xid = toplevel.window.xid
    system %Q{xprop -id #{xid} -format _NET_WM_STRUT 32c \
                               -set _NET_WM_STRUT \
                               "0, 0, #{self.height}, 0"}
    system %Q{xprop -id #{xid} -format _NET_WM_STRUT_PARTIAL 32c \
                               -set _NET_WM_STRUT_PARTIAL \
              "0, 0, #{self.height}, 0, 0, 0, 0, 0, #{x}, #{x+width-1},
0, 0"}

So I have solutions that work. Thanks for taking the time to look into
it for me.

John


[1]
http://pygtk.org/pygtk2reference/class-gdkwindow.html#method-gdkwindow--property-change
[2] https://rubygems.org/gems/xlib-objects
[3] https://www.x.org/archive/X11R7.5/doc/man/man1/xprop.1.html