[Xcb] Setting _NET_WM_STATE_FULLSCREEN

[Vincent Torri]

On Fri, 31 Dec 2010, Cinolt wrote:

> Ah, thanks. The wording of it got me thrown off. One way I have found that
> works to actually remove decorationsis the _MOTIF_WM_HINTS property, and it
> uses the following structure in the data argument of xcb_change_property:
>
> struct
>  {
>    uint32_t flags;
>    uint32_t functions;
>    uint32_t decorations;
>    int32_t  inputMode;
>    uint32_t status;
>  } Hints;
>
> Kind of off topic but is there any official XCB structure for this yet?

No. In util, there is a ICCCM utility library in the 'util' package. Iirc, 
Arnaud wrote a EWMH utility library but it is not in the 'util' (yet ?). 
So Maybe such MWM structure should go to that 'util' package.

Vincent Torri

>
> On Fri, Dec 31, 2010 at 8:41 PM, Vincent Torri <vtorri at univ-evry.fr> wrote:
>
>>
>>
>> On Fri, 31 Dec 2010, Cinolt wrote:
>>
>>  I want to create my window to fill the entire screen with no decorations.
>>> According to the EWMH specification, I should set the _NET_WM_STATE
>>> property
>>> to have the _NET_WM_STATE_FULLSCREEN atom (
>>> http://standards.freedesktop.org/wm-spec/wm-spec-1.3.html#id2507241 ).
>>> How
>>> should I do this in XCB? This is my failed attempt, it appears as a
>>> regular
>>> window:
>>>
>>
>> The documentation says:
>>
>> "_NET_WM_STATE_FULLSCREEN indicates that the window should fill the entire
>> screen and have no window decorations. Additionally the Window Manager is
>> responsible for restoring the original geometry after a switch from
>> fullscreen back to normal window. For example, a presentation program would
>> use this hint."
>>
>> so that atom just **indicates** (to the Window manager) that your window is
>> fullscreen (hence, for example (i think) the Window manager does not draw
>> the border of the window). It's up to you to create a widnow of the size of
>> the screen.
>>
>> Vincent Torri
>>
>>
>>
>>> ...
>>> xcb_connection_t* c = xcb_connect(0, 0);
>>> ...
>>> xcb_window_t w = xcb_generate_id(c);
>>> ...
>>> xcb_intern_atom_cookie_t cookie = xcb_intern_atom(c, 0, 12,
>>> "_NET_WM_STATE");
>>> xcb_intern_atom_reply_t* reply = xcb_intern_atom_reply(c, cookie, 0);
>>>
>>> xcb_intern_atom_cookie_t cookie2 = xcb_intern_atom(c, 0, 24,
>>> "_NET_WM_STATE_FULLSCREEN");
>>> xcb_intern_atom_reply_t* reply2 = xcb_intern_atom_reply(c, cookie2, 0);
>>>
>>> xcb_change_property(c, XCB_PROP_MODE_REPLACE, w, (*reply).atom, ATOM, 32,
>>> 1,
>>> &((reply2).atom);
>>> ...
>>>
>>> I can set other properties such as the window name, so the other
>>> irrelevant
>>> code should be fine. Thanks in advance.
>>>
>>>
>