Re: GTK "decorated" and "deletable" properties

[Jan Djärv]

Ted Zlatanov skrev 2011-06-03 18.29:
> On Fri, 03 Jun 2011 17:21:19 +0200 Jan Djärv<address@hidden>  wrote:
>
>
> JD>  These functions just set the MotifWMHints.  So we should make sure it
> JD>  works on all X11 ports, not just Gtk+.  Also, can these new frame
> JD>  parameters be generalized into something that makes sense on all ports
> JD>  (W32, Nextstep)?
>
> GTK on W32 respects the decorated hint and passes it on correctly,
> according to the docs.  It's not clear from the docs if W32 itself will
> display the window without decorations, but it seems so: "On Windows,
> this function always works, since there's no window manager policy
> involved."

Emacs does not suppoty Gtk+ on anything but X11.

> On NextStep / Cocoa, according to
> http://www.cocoadev.com/index.pl?BorderlessWindow it's possible but such
> a window can't have a toolbar (does it crash or simply ignore the
> toolbar?  that's not clear).  For my purposes that's OK, the pop-up
> frames I need won't have toolbars.
>
> It would be nice if each port offered even more control through native
> frame properties, of course, e.g. ns-borderless and gtk-deletable.  I
> can then set each native property and it has no effect otherwise.  But a
> general name convention is useful too.

For X11 you can do it in lisp.  Here is a function from an earlier bug report 
about Motif WM Hints (4363).  Gtk+ (as far as I know) only manipulates 
functions and decorations.

Motif wm hits is just a property with 5 values. Just use 
x-change-window-property.

(defun make-special-frame (data)
  (let ((ff (make-frame '((visibility . nil)))))
    (progn
      (x-change-window-property "_MOTIF_WM_HINTS" data ff
                                "_MOTIF_WM_HINTS" 32 t)
       (make-frame-visible ff))))

To make a frame without decoration (gtk_window_decorated):

(make-special-frame '(2 0 0 0 0))

To make a frame without delete (gtk_window_deletable):

(make-special-frame '(1 33 0 0 0))

The first value tells what to change (from /usr/include/Xm/MwmUtils.h):
#define MWM_HINTS_FUNCTIONS     (1L << 0)
#define MWM_HINTS_DECORATIONS   (1L << 1)
#define MWM_HINTS_INPUT_MODE    (1L << 2)
#define MWM_HINTS_STATUS        (1L << 3)

The second is the functions:
#define MWM_FUNC_ALL            (1L << 0)
#define MWM_FUNC_RESIZE         (1L << 1)
#define MWM_FUNC_MOVE           (1L << 2)
#define MWM_FUNC_MINIMIZE       (1L << 3)
#define MWM_FUNC_MAXIMIZE       (1L << 4)
#define MWM_FUNC_CLOSE          (1L << 5)

The third is the decorations:
#define MWM_DECOR_ALL           (1L << 0)
#define MWM_DECOR_BORDER        (1L << 1)
#define MWM_DECOR_RESIZEH       (1L << 2)
#define MWM_DECOR_TITLE         (1L << 3)
#define MWM_DECOR_MENU          (1L << 4)
#define MWM_DECOR_MINIMIZE      (1L << 5)
#define MWM_DECOR_MAXIMIZE      (1L << 6)

Note that most wm:s just check MWM_HINTS when the window is mapped, thats why 
the function creates it invisible at first.
If a frame is visible, you must (make-frame-invisble), 
(x-change-window-properties...) (make-frame-visible).

        Jan D.