GDK returns GDK_FILTER_REMOVE on its GdkWindow event filters when it
gets a change to the XSETTINGS manager selection, as well as when it
sees a change to the _XSETTINGS_SETTINGS property.  I have no idea why
it does that, and it's incredibly frustrating.

There's a workaround, though: GDK supports "default" window filters,
where if you pass NULL for the window to gdk_window_add_filter(), it
will pass *all* events to your filter function.  These default filters
run before the window-specific filters run, so we can see the xsettings
changes before GDK has a chance to see them and prevent us from seeing
them.

Closes #28

Closes #27

This is mostly taken from the xfdesktop code, but the styling is more
like the xfce4-panel window-menu plugin.  It also includes the union of
the features supported by both.

The menu currently does not auto-update in an efficient way.  Every time
the menu is re-shown, it is re-populated.  The only exception is that if
a window is destroyed while the menu is being shown, the menu item for
it will be removed.

Closes #20

Brian Tarricone authored 5 months ago and Brian Tarricone committed 5 months ago

Apparently that's just for functions that create an instance of the
specific class the function is associated with.  In our case, XfwScreen
is an abstract class and can't be instantiated.

At the very least the Vala compiler doesn't like this, and leaves out
_get_default() entirely in its bindings.

Closes #25

Not sure why it wasn't already; it's declared as a final type, and
there's no reason to make the contents of the struct public, or use a
->priv pointer.

This is only used for xfw_window_activate() so far.

Closes #26

libwnck reports window geometry in unscaled physical pixels, so we need
to compare with the monitor's physical pixels in order to tell if the
window is on that monitor.

This does raise a question: should the window geometry reported through
the API report physical or logical pixels?

Updates from our xfce4-dev-tools template

This gets rid of typedef redefinition warnings in libwnck's headers.
And in general we are using C11 anyway, and shouldn't feel constrained
by a 25-year old standard.

Closes #24

Gets rid of a global and the need for a GOnce.

If we have no monitors, then gdk_display_get_monitor(dpy, 0) will return
NULL, and we won't be able to get the scale factor.