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<HTML
><HEAD
><TITLE
>Application Window Properties</TITLE
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><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="AEN225"
>5. Application Window Properties</A
></H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN227"
>5.1. _NET_WM_NAME</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_NAME, UTF8_STRING</PRE
><P
>The Client SHOULD set this to the title of the window in UTF-8 encoding. If
set, the Window Manager should use this in preference to WM_NAME.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN231"
>5.2. _NET_WM_VISIBLE_NAME</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_VISIBLE_NAME, UTF8_STRING</PRE
><P
>If the Window Manager displays a window name other than _NET_WM_NAME the Window Manager MUST set this to the title displayed in UTF-8 encoding.
</P
><P
>Rationale: For window managers that display a title different from the _NET_WM_NAME or WM_NAME of the window (i.e. xterm <1>, xterm <2>, ... is shown, but _NET_WM_NAME / WM_NAME is still xterm for each window). This property allows taskbars / pagers to display the same title as the window manager.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN236"
>5.3. _NET_WM_ICON_NAME</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_ICON_NAME, UTF8_STRING</PRE
><P
>The Client SHOULD set this to the title of the icon for this window in UTF-8
encoding. If set, the Window Manager should use this in preference to
WM_ICON_NAME.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN240"
>5.4. _NET_WM_VISIBLE_ICON_NAME</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_VISIBLE_ICON_NAME, UTF8_STRING</PRE
><P
>If the Window Manager displays an icon name other than _NET_WM_ICON_NAME
the Window Manager MUST set this to the title displayed in UTF-8 encoding.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN244"
>5.5. _NET_WM_DESKTOP</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_DESKTOP desktop, CARDINAL/32</PRE
><P
>Cardinal to determine the desktop the window is in (or wants to be) starting
with 0 for the first desktop. A Client MAY choose not to set this property,
in which case the Window Manager SHOULD place as it wishes. 0xFFFFFFFF
indicates that the window SHOULD appear on all desktops/workspaces.
</P
><P
>The Window Manager should honor _NET_WM_DESKTOP whenever a withdrawn window
requests to be mapped.
</P
><P
>The Window Manager should remove the property whenever
a window is withdrawn, but it should leave the property in place when it is
shutting down, e.g. in response to losing ownership of the WM_Sn manager
selection.
</P
><P
>Rationale: Removing the property upon window withdrawal helps legacy
applications which want to reuse withdrawn windows. Not removing the property
upon shutdown allows the next Window Manager to restore windows to their
previous desktops.
</P
><P
>A Client can request a change of desktop for a non-withdrawn window by sending
a _NET_WM_DESKTOP client message to the root window:
</P
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_DESKTOP
window = the respective client window
message_type = _NET_WM_DESKTOP
format = 32
data.l[0] = new_desktop</PRE
><P
> The Window Manager MUST keep this property updated on all windows.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN254"
>5.6. _NET_WM_WINDOW_TYPE</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_WINDOW_TYPE, ATOM[]/32</PRE
><P
>This SHOULD be set by the Client before mapping, to a list of atoms indicating
the functional type of the window. This property SHOULD be used by the window
manager in determining the decoration, stacking position and other behaviour
of the window. The Client SHOULD specify window types in order of preference
(the first being most preferable), but MUST include at least one of the basic
window type atoms from the list below. This is to allow for extension of the
list of types, whilst providing default behaviour for window managers that do
not recognise the extensions.
</P
><P
>Rationale: This hint is intend to replace the MOTIF hints. One of the
objections to the MOTIF hints is that they are a purely visual description of
the window decoration. By describing the function of the window, the window
manager can apply consistent decoration and behaviour to windows of the same
type. Possible examples of behaviour include keeping dock/panels on top or
allowing pinnable menus / toolbars to only be hidden when another window has
focus (NextStep style).
</P
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_WINDOW_TYPE_DESKTOP, ATOM
_NET_WM_WINDOW_TYPE_DOCK, ATOM
_NET_WM_WINDOW_TYPE_TOOLBAR, ATOM
_NET_WM_WINDOW_TYPE_MENU, ATOM
_NET_WM_WINDOW_TYPE_UTILITY, ATOM
_NET_WM_WINDOW_TYPE_SPLASH, ATOM
_NET_WM_WINDOW_TYPE_DIALOG, ATOM
_NET_WM_WINDOW_TYPE_NORMAL, ATOM</PRE
><P
>_NET_WM_WINDOW_TYPE_DESKTOP indicates a desktop feature. This can include a
single window containing desktop icons with the same dimensions as the screen,
allowing the desktop environment to have full control of the desktop, without
the need for proxying root window clicks.
</P
><P
>_NET_WM_WINDOW_TYPE_DOCK indicates a dock or panel feature. Typically a
window manager would keep such windows on top of all other windows.
</P
><P
>_NET_WM_WINDOW_TYPE_TOOLBAR and _NET_WM_WINDOW_TYPE_MENU indicate toolbar and
pinnable menu windows, respectively (i.e. toolbars and menus "torn off" from
the main application). Windows of this type may set the WM_TRANSIENT_FOR
hint indicating the main application window.
</P
><P
>_NET_WM_WINDOW_TYPE_UTILITY indicates a small persistent utility window, such as
a palette or toolbox. It is distinct from type TOOLBAR because it does not
correspond to a toolbar torn off from the main application. It's distinct from
type DIALOG because it isn't a transient dialog, the user will probably keep it
open while they're working. Windows of this type may set the WM_TRANSIENT_FOR
hint indicating the main application window.
</P
><P
>_NET_WM_WINDOW_TYPE_SPLASH indicates that the window is a splash screen
displayed as an application is starting up.
</P
><P
>_NET_WM_WINDOW_TYPE_DIALOG indicates that this is a dialog window. If
_NET_WM_WINDOW_TYPE is not set, then windows with WM_TRANSIENT_FOR set MUST
be taken as this type.
</P
><P
>_NET_WM_WINDOW_TYPE_NORMAL indicates that this is a normal, top-level window.
Windows with neither _NET_WM_WINDOW_TYPE nor WM_TRANSIENT_FOR are set MUST
be taken as this type.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN267"
>5.7. _NET_WM_STATE</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_STATE, ATOM[]</PRE
><P
>A list of hints describing the window state. Atoms present in the list MUST be
considered set, atoms not present in the list MUST be considered not set. The
Window Manager SHOULD honor
_NET_WM_STATE whenever a withdrawn window requests to be mapped. A Client
wishing to change the state of a window MUST send a _NET_WM_STATE client
message to the root window (see below). The Window Manager MUST keep this
property updated to reflect the current state of the window.
</P
><P
>The Window Manager should remove the property whenever
a window is withdrawn, but it should leave the property in place when it is
shutting down, e.g. in response to losing ownership of the WM_Sn manager
selection.
</P
><P
>Rationale: Removing the property upon window withdrawal helps legacy
applications which want to reuse withdrawn windows. Not removing the property
upon shutdown allows the next Window Manager to restore windows to their
previous state.
</P
><P
>Possible atoms are:
</P
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_STATE_MODAL, ATOM
_NET_WM_STATE_STICKY, ATOM
_NET_WM_STATE_MAXIMIZED_VERT, ATOM
_NET_WM_STATE_MAXIMIZED_HORZ, ATOM
_NET_WM_STATE_SHADED, ATOM
_NET_WM_STATE_SKIP_TASKBAR, ATOM
_NET_WM_STATE_SKIP_PAGER, ATOM
_NET_WM_STATE_HIDDEN, ATOM
_NET_WM_STATE_FULLSCREEN, ATOM
_NET_WM_STATE_FLOATING, ATOM</PRE
><P
>An implementation MAY add new atoms to this list. Implementations
without extensions MUST ignore any unknown atoms, effectively removing
them from the list. These extension atoms MUST NOT start with the prefix
_NET.
</P
><P
>_NET_WM_STATE_MODAL indicates that this is a modal dialog box. The
WM_TRANSIENT_FOR hint MUST be set to indicate which window the dialog is a
modal for, or set to the root window if the dialog is a modal for its window
group.
</P
><P
>_NET_WM_STATE_STICKY indicates that the Window Manager SHOULD keep the
window's position fixed on the screen, even when the virtual desktop scrolls.
</P
><P
>_NET_WM_STATE_MAXIMIZED_{VERT,HORZ} indicates that the window is
{vertically,horizontally} maximised.
</P
><P
>_NET_WM_STATE_SHADED indicates that the window is shaded.
</P
><P
>_NET_WM_STATE_SKIP_TASKBAR indicates that the window should not be
included on a taskbar. This hint should be requested by the
application, i.e. it indicates that the window by nature is never
in the taskbar. Applications should not set this hint if
_NET_WM_WINDOW_TYPE already conveys the exact nature of the
window.
</P
><P
>_NET_WM_STATE_SKIP_PAGER indicates that the window should not be
included on a Pager. This hint should be requested by the application,
i.e. it indicates that the window by nature is never in the
Pager. Applications should not set this hint if _NET_WM_WINDOW_TYPE
already conveys the exact nature of the window.
</P
><P
>_NET_WM_STATE_HIDDEN should be set by the window manager to indicate
that a window would not be visible on the screen if its
desktop/viewport were active and its coordinates were within the
screen bounds. The canonical example is that minimized windows should
be in the _NET_WM_STATE_HIDDEN state. Pagers and similar applications
should use _NET_WM_STATE_HIDDEN instead of WM_STATE to decide whether
to display a window in miniature representations of the windows on a
desktop.
<A
NAME="AEN283"
HREF="#FTN.AEN283"
>[1]</A
>
</P
><P
>_NET_WM_STATE_FULLSCREEN indicates that the window should fill the entire screen
and have no window decorations. For example, a presentation program would use
this hint.
</P
><P
>_NET_WM_STATE_FLOATING indicates that the window should be on top of other
windows of the same type. Applications should not set this hint
if _NET_WM_WINDOW_TYPE already conveys the exact nature of the window.
Windows in this state would typically appear above other windows of the same
_NET_WM_WINDOW_TYPE.
</P
><P
>To change the state of a mapped window, a Client MUST send a _NET_WM_STATE
client message to the root window (window is the respective window, type
_NET_WM_STATE, format 32, l[0]=<the action, as listed below>,
l[1]=<First property to alter>, l[2]=<Second property to alter>).
This message allows two properties to be changed simultaneously, specifically
to allow both horizontal and vertical maximisation to be altered together.
l[2] MUST be set to zero if only one property is to be changed. l[0], the
action, MUST be one of:
</P
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_STATE_REMOVE 0 /* remove/unset property */
_NET_WM_STATE_ADD 1 /* add/set property */
_NET_WM_STATE_TOGGLE 2 /* toggle property */</PRE
><P
> See also the implementation notes on <A
HREF="x351.html#URGENCY"
>urgency</A
> and <A
HREF="x351.html#NORESIZE"
>fixed size windows</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN292"
>5.8. _NET_WM_ALLOWED_ACTIONS</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_ALLOWED_ACTIONS, ATOM[]</PRE
><P
>A list of atoms indicating user operations that the window manager supports for
this window. Atoms present in the list indicate allowed actions, atoms not
present in the list indicate actions that are not supported for this window.
The window manager MUST keep this property updated to reflect the
actions which are currently "active" or "sensitive" for a window.
Taskbars, Pagers, and other tools use _NET_WM_ALLOWED_ACTIONS to
decide which actions should be made available to the user.
</P
><P
>Possible atoms are:
</P
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_ACTION_MOVE, ATOM
_NET_WM_ACTION_RESIZE, ATOM
_NET_WM_ACTION_SHADE, ATOM
_NET_WM_ACTION_STICK, ATOM
_NET_WM_ACTION_MAXIMIZE_HORZ, ATOM
_NET_WM_ACTION_MAXIMIZE_VERT, ATOM
_NET_WM_ACTION_FULLSCREEN, ATOM
_NET_WM_ACTION_CHANGE_DESKTOP, ATOM
_NET_WM_ACTION_CLOSE, ATOM</PRE
><P
>An implementation MAY add new atoms to this list. Implementations
without extensions MUST ignore any unknown atoms, effectively removing
them from the list. These extension atoms MUST NOT start with the prefix
_NET.
</P
><P
>Note that the actions listed here are those that the <SPAN
CLASS="emphasis"
><I
CLASS="EMPHASIS"
>Window
Manager</I
></SPAN
> will honor for this window. The operations must still be
requested through the normal mechanisms outlined in this specification. For
example, _NET_WM_ACTION_CLOSE does not mean that clients can send a
WM_DELETE_WINDOW message to this window; it means that clients can use a
_NET_CLOSE_WINDOW message to ask the Window Manager to do so.
</P
><P
>Window Managers SHOULD ignore the value of _NET_WM_ALLOWED_ACTIONS when they
initially manage a window. This value may be left over from a previous window
manager with different policies.
</P
><P
>_NET_WM_ACTION_MOVE indicates that the window may be moved around the screen.
</P
><P
>_NET_WM_ACTION_RESIZE indicates that the window may be resized.
(Implementation note: window managers can identify a non-resizable
window because its minimum and maximum size in WM_NORMAL_HINTS will be the same.)
</P
><P
>_NET_WM_ACTION_SHADE indicates that the window may be shaded.
</P
><P
>_NET_WM_ACTION_STICK indicates that the window may have its sticky state
toggled (as for _NET_WM_STATE_STICKY). Note that this state has to do with
viewports, not desktops.
</P
><P
>_NET_WM_ACTION_MAXIMIZE_HORZ indicates that the window may be maximized horizontally.
</P
><P
>_NET_WM_ACTION_MAXIMIZE_VERT indicates that the window may be maximized vertically.
</P
><P
>_NET_WM_ACTION_FULLSCREEN indicates that the window may be brought to
fullscreen mode.
</P
><P
>_NET_WM_ACTION_CHANGE_DESKTOP indicates that the window may be moved between desktops.
</P
><P
>_NET_WM_ACTION_CLOSE indicates that the window may be closed (i.e. a WM_DELETE_WINDOW
message may be sent).
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN311"
>5.9. _NET_WM_STRUT</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_STRUT, left, right, top, bottom, CARDINAL[4]/32</PRE
><P
>This property MUST be set by the Client if the window is to reserve space at
the edge of the screen. The property contains a 4 cardinals specifying the
width of the reserved area at each border of the screen.
The order of the borders is left, right, top, bottom.
The client MAY change this property anytime, therefore the Window Manager MUST
watch out for property notify events.
</P
><P
>The purpose of struts is to reserve space at the borders of the desktop. This
is very useful for a docking area, a taskbar or a panel, for instance. The
window manager should know about this reserved space in order to be able to
preserve the space. Also maximized windows should not cover that reserved
space.
</P
><P
>Rationale: A simple "do not cover" hint is not enough for dealing with e.g.
auto-hide panels.
</P
><P
>Notes: An auto-hide panel SHOULD set the strut to be its minimum, hidden size.
A "corner" panel that does not extend for the full length of a screen border
SHOULD only set one strut.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN318"
>5.10. _NET_WM_ICON_GEOMETRY</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_ICON_GEOMETRY, x, y, width, height, CARDINAL[4]/32</PRE
><P
>This optional property MAY be set by standalone tools like a taskbar or an
iconbox. It specifies the geometry of a possible icon in case the window is iconified.
</P
><P
>Rationale: This makes it possible for a window manager to display a nice
animation like morphing the window into its icon.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN323"
>5.11. _NET_WM_ICON</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_ICON CARDINAL[][2+n]/32</PRE
><P
>This is an array of possible icons for the client. This specification does
not stipulate what size these icons should be, but individual desktop
environments or toolkits may do so. The Window Manager MAY scale any of these
icons to an appropriate size.
</P
><P
>This is an array of 32bit packed CARDINAL ARGB with high byte being A, low
byte being B. First two cardinals are width, height. Data is in rows, left to
right and top to bottom.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN328"
>5.12. _NET_WM_PID</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_PID CARDINAL/32</PRE
><P
>If set, this property MUST contain the process ID of the client owning this
window. This MAY be used by the Window Manager to kill windows which do not
respond to the _NET_WM_PING protocol.
</P
><P
>If _NET_WM_PID is set, the ICCCM-specified property WM_CLIENT_MACHINE
MUST also be set. While the ICCCM only requests that WM_CLIENT_MACHINE is set
<SPAN
CLASS="QUOTE"
>" to a string that forms the name of the machine running the client as
seen from the machine running the server"</SPAN
> conformance to this
specification requires that WM_CLIENT_MACHINE be set to the fully-qualified domain
name of the client's host.
</P
><P
>See also the implementation notes on <A
HREF="x351.html#KILLINGWINDOWS"
>killing hung processes</A
>.
</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN336"
>5.13. _NET_WM_HANDLED_ICONS</A
></H2
><PRE
CLASS="PROGRAMLISTING"
>_NET_WM_HANDLED_ICONS</PRE
><P
>This property can be set by clients to indicate that the Window Manager need
not provide icons for iconified windows, for example if the client is a taskbar
and provides buttons for iconified windows.
</P
></DIV
></DIV
><H3
CLASS="FOOTNOTES"
>Notes</H3
><TABLE
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><TD
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><A
NAME="FTN.AEN283"
HREF="x225.html#AEN283"
>[1]</A
></TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
WIDTH="95%"
><P
>Implementation note: if an application asks to toggle
_NET_WM_STATE_HIDDEN the window manager should probably just ignore
the request, since _NET_WM_STATE_HIDDEN is a function of some other
aspect of the window such as minimization, rather than an independent
state.</P
></TD
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