From 2aa01fd8d4ff9d82a760e86472daadadaaf1d594 Mon Sep 17 00:00:00 2001 From: Karol Szwed Date: Wed, 21 Aug 2002 07:37:55 +0000 Subject: [PATCH] Remove ancient 2yr old extended WM spec. Adding the current draft of the WM spec, version 1.2 (August 19, 2002). svn path=/trunk/kdebase/kwin/; revision=173009 --- wm-spec/index.html | 275 +++++------ wm-spec/x107.html | 627 +++++++++++++++++++++++++ wm-spec/x123.html | 207 --------- wm-spec/x137.html | 562 ----------------------- wm-spec/x208.html | 225 +++++++++ wm-spec/x216.html | 231 ---------- wm-spec/x225.html | 720 +++++++++++++++++++++++++++++ wm-spec/x24.html | 496 ++++++++++++++++++++ wm-spec/{x207.html => x340.html} | 57 ++- wm-spec/x351.html | 648 ++++++++++++++++++++++++++ wm-spec/x479.html | 143 ++++++ wm-spec/x483.html | 166 +++++++ wm-spec/x489.html | 178 +++++++ wm-spec/x512.html | 763 +++++++++++++++++++++++++++++++ wm-spec/x71.html | 429 ----------------- 15 files changed, 4103 insertions(+), 1624 deletions(-) create mode 100644 wm-spec/x107.html delete mode 100644 wm-spec/x123.html delete mode 100644 wm-spec/x137.html create mode 100644 wm-spec/x208.html delete mode 100644 wm-spec/x216.html create mode 100644 wm-spec/x225.html create mode 100644 wm-spec/x24.html rename wm-spec/{x207.html => x340.html} (78%) create mode 100644 wm-spec/x351.html create mode 100644 wm-spec/x479.html create mode 100644 wm-spec/x483.html create mode 100644 wm-spec/x489.html create mode 100644 wm-spec/x512.html delete mode 100644 wm-spec/x71.html diff --git a/wm-spec/index.html b/wm-spec/index.html index de98f2f975..187fe7d72b 100644 --- a/wm-spec/index.html +++ b/wm-spec/index.html @@ -4,12 +4,18 @@ >Extended Window Manager Hints
Extended Window Manager Hints

X Desktop Group +

DRAFT version 1.2
August 19, 2002
Table of Contents
1. Introduction
2. Non-ICCCM features
3. Root Window Properties (+Related Messages)
4. Other Root Window Messages
5. Application Window Properties
6. Window Manager Protocols
7. Implementation notes
8. References
9. Copyright
10. Contributors
11. Change history

Introduction1. Introduction

What is this spec?1.1. Version

This spec defines interactions between window managers, applications and the utilities that form part of a desktop environment. It builds on the ICCCM, which defines wm/client interactions at a lower level. It was born out of a need to replace the original Gnome WM specification, although this specification has been designed to be independent of any one desktop environment. +>This is DRAFT version 1.2 of the Extended Window Manager Hints (EWMH) spec, updated August 19, 2002.

Language used in this specification1.2. What is this spec?

This spec defines interactions between window managers, applications, +and the utilities that form part of a desktop environment. It builds +on the ICCCM [2], which defines WM (window manager) interactions at a +lower level. The ICCCM does not provide ways to implement many +features that modern desktop users expect. The GNOME and KDE desktop +projects originally developed their own extensions to the ICCCM to +support these features; this spec replaces those custom extensions +with a standardized set of ICCCM additions that any desktop +environment can adopt. +

1.3. Language used in this specification

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", @@ -105,155 +176,15 @@ CLASS="SECT2" >

Changes since 1.9d1.4. Prerequisites for adoption of this specification

  • Added _NET_VIRTUAL_ROOTS -

  • Added note about ICCCM compliant window moves. -

  • Added _NET_WM_HANDLED_ICONS -

  • Added _NET_SUPPORTING_WM_CHECK -

  • Removed degrees of activation -

Changes since 1.9c

  • Removed packaging of hints into 2 X properties. Jim Gettys points out that the -performance gains of fewer round trips can be better achieved using Xlib -routines. -

  • Clarified that _NET_DESKTOP_VIEWPORT is in pixels -

  • _NET_DESKTOP_VIEWPORT is now an array, one for each desktop, to allow for -different active viewports on different desktops -

  • _NET_WM_STRUT now only applies on desktops on which the client is visible -

  • Introduced RFC 2119 language, and attempted to clarify the roles of the Window -Manager, Pagers and Applications -

  • Added _NET_WM_NAME -

  • _NET_DESKTOP_NAMES now in UTF8 -

  • Desktops now start from 0 -

  • Added _NET_WM_PID -

  • Added _NET_WM_PING protocol -

  • Added _NET_WM_STATE_SKIP_TASKBAR -

Changes since 1.9b

  • Removed _NET_NUMBER_OF_DESKTOPS client message, as it overlaps unnecessarily with _NET_{INSERT/DELETE}_DESKTOP.

  • Replaced _NET_WM_LAYER and _NET_WM_HINTS with _NET_WM_WINDOW_TYPE functional hint.

  • Changed _NET_WM_STATE to a list of atoms, for extensibility.

  • Expanded description of _NET_WORKAREA and _NET_WM_STRUT.

  • Removed _NET_WM_SIZEMOVE_NOTIFY protocol.

  • Added degrees of activation to _NET_ACTIVE_WINDOW client message

  • Added _NET_WM_ICON

  • My comments are in [[ ]]. Comments from Marko's draft are in [[MM: ]]

Window Managers and Clients which aim to fulfil this specification MUST adhere +to the ICCCM on which this specification builds. If this specification +explicitly modifies the ICCCM Window Managers and Clients MUST fulfil these +modifications. +

NextRoot Window Properties (+Related Messages)Non-ICCCM features
Root Window Properties (+Related Messages)
PrevNext

3. Root Window Properties (+Related Messages)

Whenever this spec speaks about "sending a message to the root +window", it is understood that the client is supposed to create +a ClientMessage event with the specified contents and send it by using +a SendEvent request with the following arguments: + 

destination     root
+propagate       False
+event-mask      (SubstructureNotify|SubstructureRedirect)
+event           the specified ClientMessage
+

3.1. _NET_SUPPORTED

_NET_SUPPORTED, ATOM[]/32

This property MUST be set by the Window Manager to indicate which hints it +supports. For example: considering _NET_WM_STATE +both this atom and all supported states e.g. _NET_WM_STATE_MODAL, +_NET_WM_STATE_STICKY, would be listed. This assumes that backwards +incompatible changes will not be made to the hints (without being renamed). +

3.2. _NET_CLIENT_LIST

_NET_CLIENT_LIST, WINDOW[]/32
+_NET_CLIENT_LIST_STACKING, WINDOW[]/32

These arrays contain all X Windows managed by the Window Manager. +_NET_CLIENT_LIST has initial mapping order, starting with the oldest window. +_NET_CLIENT_LIST_STACKING has bottom-to-top stacking order. These properties +SHOULD be set and updated by the Window Manager. +

3.3. _NET_NUMBER_OF_DESKTOPS

_NET_NUMBER_OF_DESKTOPS, CARDINAL/32

This property SHOULD be set and updated by the Window Manager to indicate the +number of virtual desktops. +

A Pager can request change in the desktops number by sending a _NET_NUMBER_OF_DESKTOPS message to the root window: + 

_NET_NUMBER_OF_DESKTOPS
+  message_type = _NET_NUMBER_OF_DESKTOPS
+  format = 32
+  data.l[0] = new_number_of_desktops

The Window Manager is free to honor or reject this request. If request is honored _NET_NUMBER_OF_DESKTOPS MUST be set to the new number of desktops, _NET_VIRTUAL_ROOTS MUST be set to store the new number of desktop virtual root window IDs and _NET_DESKTOP_VIEWPORT and _NET_WORKAREA must also be changed accordingly. The _NET_DESKTOP_NAMES property MAY remain unchanged. +

+If the number of desktops is shrinking and _NET_CURRENT_DESKTOP is out of the new range of available desktops, then this MUST be set to the last available desktop from the new set. If number of desktops is shrinking then clients that are still present on desktops, that are out of the new range, MUST be moved to the very last desktop from the new set. For these _NET_WM_DESKTOP MUST be updated. +

3.4. _NET_DESKTOP_GEOMETRY

_NET_DESKTOP_GEOMETRY width, height, CARDINAL[2]/32

Array of two cardinals that defines the common size of all desktops. +This property SHOULD be set by the Window Manager. +

A Pager can request a change in the desktop geometry by sending a _NET_DESKTOP_GEOMETRY client +message to the root window: + 

_NET_DESKTOP_GEOMETRY
+  message_type = _NET_DESKTOP_GEOMETRY 
+  format = 32
+  data.l[0] = new_width
+  data.l[1] = new_height

The Window Manager MAY choose to ignore this message, in which case _NET_DESKTOP_GEOMETRY property will remain unchanged. +

3.5. _NET_DESKTOP_VIEWPORT

_NET_DESKTOP_VIEWPORT x, y, CARDINAL[][2]/32

Array of pairs of cardinals that define the top left corner of each desktops +viewport. For Window Managers that don't support large desktops, this MUST +always be set to (0,0). +

A Pager can request to change the viewport for the current desktop by sending a +_NET_DESKTOP_VIEWPORT client message to the root window: + 

_NET_DESKTOP_VIEWPORT
+  message_type = _NET_DESKTOP_VIEWPORT
+  format = 32
+  data.l[0] = new_vx
+  data.l[1] = new_vy

The Window Manager MAY choose to ignore this message, in which case _NET_DESKTOP_VIEWPORT property will remain unchanged. +

3.6. _NET_CURRENT_DESKTOP

_NET_CURRENT_DESKTOP desktop, CARDINAL/32

The index of the current desktop. This is always an integer between 0 and +_NET_NUMBER_OF_DESKTOPS - 1. This MUST be set and updated by the Window +Manager If a Pager wants to switch to another virtual desktop, it MUST send +a _NET_CURRENT_DESKTOP client message to the root window: + 

_NET_CURRENT_DESKTOP
+  message_type = _NET_CURRENT_DESKTOP 
+  format = 32
+  data.l[0] = new_index

3.7. _NET_DESKTOP_NAMES

_NET_DESKTOP_NAMES, UTF8_STRING[]

The names of all virtual desktops. This is a list of NULL-terminated strings in UTF-8 [1] encoding. This property MAY be changed by a Pager or the Window Manager at any time. +

Note: The number of names could be different from _NET_NUMBER_OF_DESKTOPS. +If it is less than _NET_NUMBER_OF_DESKTOPS - then the desktops with high +numbers are unnamed. If it is larger than _NET_NUMBER_OF_DESKTOPS, then the +excess names outside of the _NET_NUMBER_OF_DESKTOPS are considered to be +reserved in case number of desktops is increased.

Rationale: The name is not a necessary attribute of a virtual desktop. Thus +the availability or unavailability of names has no impact on virtual desktop +functionality. Since names are set by users and users are likely to preset +names for a fixed number of desktops, it doesn't make sense to shrink or grow +this list when the number of available desktops changes.

3.8. _NET_ACTIVE_WINDOW

_NET_ACTIVE_WINDOW, WINDOW/32

The window ID of the currently active window or None if no window has the focus. +This is a read-only property set by the +Window Manager. If a client (for example, a taskbar) wants to activate +another window, it MUST send a _NET_ACTIVE_WINDOW client message to the root +window: + 

_NET_ACTIVE_WINDOW
+  window  = window to activate
+  message_type = _NET_ACTIVE_WINDOW
+  format = 32
+  data.l[0] = 0 /* may be used later */

3.9. _NET_WORKAREA

_NET_WORKAREA, x, y, width, height CARDINAL[][4]/32
+

This property MUST be set by WM upon calculating the work area for +each desktop. Contains a geometry for each desktop. These geometries are +specified relative to the viewport on each desktop and specify an area that is +completely contained within the viewport. + Work area SHOULD be used by desktop applications to place desktop icons appropriately. +

The Window Manager SHOULD calculate this space by taking the current page minus space occupied by dock and panel windows, as indicated by the _NET_WM_STRUT property set on client windows. +

3.10. _NET_SUPPORTING_WM_CHECK

_NET_SUPPORTING_WM_CHECK, WINDOW/32

The Window Manager MUST set this property on the root window to be the ID of a + child window created by the WM, to indicate that a compliant WM is + active. The child window MUST also have the _NET_SUPPORTING_WM_CHECK + property set to the ID of the child window. The child window MUST also + have the _NET_WM_NAME property set to the name of the Window Manager. +

Rationale: The child window is used to distinguish an active Window Manager + from a stale _NET_SUPPORTING_WM_CHECK + property that happens to point to another window. If the + _NET_SUPPORTING_WM_CHECK window on the client window is missing + or not properly set, clients SHOULD assume that no conforming + Window Manager is present. +

3.11. _NET_VIRTUAL_ROOTS

_NET_VIRTUAL_ROOTS, WINDOW[]/32

To implement virtual desktops, some window managers reparent client windows to +a child of the root window. Window managers using this technique MUST set +this property to a list of IDs for windows that are acting as virtual root +windows. This property allows background setting programs to work with +virtual roots and allows clients to figure out the WM frame windows of their +windows. +

3.12. _NET_DESKTOP_LAYOUT

_NET_DESKTOP_LAYOUT, orientation, x, y, starting_corner CARDINAL[4]/32
+  #define _NET_WM_ORIENTATION_HORZ 0
+  #define _NET_WM_ORIENTATION_VERT 1
+
+  #define _NET_WM_TOPLEFT     0
+  #define _NET_WM_TOPRIGHT    1
+  #define _NET_WM_BOTTOMRIGHT 2
+  #define _NET_WM_BOTTOMLEFT  3

This property is set by a Pager, not by the Window + Manager. + When setting this property, the Pager must own a manager selection (as + defined in the ICCCM 2.8). The manager selection is called + _NET_DESKTOP_LAYOUT_Sn where + n is the screen number. The purpose of + this property is to allow the Window Manager to know the desktop + layout displayed by the Pager. +

_NET_DESKTOP_LAYOUT describes the layout of virtual + desktops relative to each other. More specifically, it describes the layout + used by the owner of the manager selection. The Window Manager may use + this layout information or may choose to ignore it. + The property contains four values: the Pager orientation, the number of + desktops in the X direction, the number in the Y direction, and the + starting corner of the Pager. +

Note: In order to interoperate with Pagers implementing an earlier + draft of this document, Window Managers should accept a + _NET_DESKTOP_LAYOUT property of length 3 and + use _NET_WM_TOPLEFT as the starting corner in this case. +

The virtual desktops are arranged in a rectangle + with X rows and Y columns. If X times Y does not match the total number of + desktops as specified by + _NET_NUMBER_OF_DESKTOPS, the highest-numbered + workspaces are assumed to be nonexistent. Either X or Y (but not + both) may be specified as 0 in which case its actual value will be + derived from _NET_NUMBER_OF_DESKTOPS. +

When the orientation is _NET_WM_ORIENTATION_HORZ + the desktops are layed out in rows, with the first desktop in the + specified starting corner. So a layout with X=4 and Y=3 starting in + the _NET_WM_TOPLEFT corner looks like this: +

 +--+--+--+--+
+ | 0| 1| 2| 3|
+ +--+--+--+--+
+ | 4| 5| 6| 7|
+ +--+--+--+--+
+ | 8| 9|10|11|
+ +--+--+--+--+
+With starting_corner _NET_WM_BOTTOMRIGHT, it looks like +this: +
 +--+--+--+--+
+ |11|10| 9| 8|
+ +--+--+--+--+
+ | 7| 6| 5| 4|
+ +--+--+--+--+
+ | 3| 2| 1| 0|
+ +--+--+--+--+
+ +

When the orientation is _NET_WM_ORIENTATION_VERT + the layout for X=4 and Y=3 starting in the _NET_WM_TOPLEFT + corner looks like: + +

 +--+--+--+--+
+ | 0| 3| 6| 9|
+ +--+--+--+--+
+ | 1| 4| 7|10|
+ +--+--+--+--+
+ | 2| 5| 8|11|
+ +--+--+--+--+
+With starting_corner _NET_WM_TOPRIGHT, it looks like: + +
 +--+--+--+--+
+ | 9| 6| 3| 0|
+ +--+--+--+--+
+ |10| 7| 4| 1|
+ +--+--+--+--+
+ |11| 8| 5| 2|
+ +--+--+--+--+
+

The numbers here are the desktop numbers, as for + _NET_CURRENT_DESKTOP. +

3.13. _NET_SHOWING_DESKTOP

_NET_SHOWING_DESKTOP desktop, CARDINAL/32

Some Window Managers have a "showing the desktop" mode in which windows + are hidden, and the desktop background is displayed and focused. If a + Window Manager supports the _NET_SHOWING_DESKTOP hint, it MUST set it + to a value of 1 if the Window Manager is in "showing the desktop" mode, + and a value of zero if the Window Manager is not in this mode. +

If a Pager wants to enter or leave the mode, it MUST + send a _NET_SHOWING_DESKTOP client message to the root window + requesting the change: + 

_NET_SHOWING_DESKTOP
+  message_type = _NET_SHOWING_DESKTOP 
+  format = 32
+  data.l[0] = boolean 0 or 1
+ The Window Manager may choose to ignore this client message. +

PrevHomeNext
Non-ICCCM features Other Root Window Messages
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Extended Window Manager Hints
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Other Root Window Messages

_NET_CLOSE_WINDOW

_NET_CLOSE_WINDOW

Pagers wanting to close a window MUST send a _NET_CLOSE_WINDOW client message request to the root window (type _NET_ACTIVE_WINDOW, format 32, l[0]=0 /*may be used later*/, window should be set to the window to close). The Window Manager MUST then attempt to close the window specified. -

Rationale: A window manager might be more clever than the usual method (send WM_DELETE message if the protocol is selected, XKillClient otherwise). It might introduce a timeout, for example. Instead of duplicating the code, the Window Manager can easily do the job. -

_NET_WM_MOVERESIZE

_NET_WM_MOVERESIZE
-  window = target app window
-  message_type = _NET_WM_MOVERESIZE
-  format = 16
-  data.s[0] = x_root 
-  data.s[1] = y_root
-  data.s[2] = direction

This message allows an application to initiate window movement or resizing. This allows the application to define its own move and size "grips", whilst letting the window manager control the actual move/resize. This means that all moves / resizes can happen in a consistent manner as defined by the WM. -

When sending this message, x_root and y_root SHOULD indicate the position of the mouse click [[PDW: with respect to what?]] and direction MUST indicate whether this is a move or resize event, and if it is a resize event, which edges of the window the size grip applies to. - 

#define _NET_WM_MOVERESIZE_SIZE_TOPLEFT      0
-#define _NET_WM_MOVERESIZE_SIZE_TOP          1
-#define _NET_WM_MOVERESIZE_SIZE_TOPRIGHT     2
-#define _NET_WM_MOVERESIZE_SIZE_RIGHT        3
-#define _NET_WM_MOVERESIZE_SIZE_BOTTOMRIGHT  4
-#define _NET_WM_MOVERESIZE_SIZE_BOTTOM       5
-#define _NET_WM_MOVERESIZE_SIZE_BOTTOMLEFT   6
-#define _NET_WM_MOVERESIZE_SIZE_LEFT         7
-#define _NET_WM_MOVERESIZE_MOVE              8   /* Movement only */

[[PDW: Why do we need to indicate the direction? The WM could guess this from the click position - some WMs (eg. sawmill) have code for doing something similar when you hold eg. Meta + click in the client area... ]] -

PrevHomeNext
Root Window Properties (+Related Messages) Application Window Properties
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Extended Window Manager Hints
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Application Window Properties

_NET_PROPERTIES

_NET_PROPERTIES, ATOM[]/32

Enables only use of listed properties on this windows. If this property is -set, the Window Manager MUST only handle (XGetWindowProperty) properties -listed here. This property MUST be set by the Client before any other _NET -hints can be used. If this property is set, it MUST also include any ICCCM -client-only (not WM_STATE) hints that are set by the client. If WM_PROTOCOLS -is not listed here, the Window Manager SHOULD assume that it contains exactly -WM_DELETE_WINDOW. -

This is a performance optimization. [[MM: I still have to do a benchmark.]] -

_NET_WM_NAME

_NET_WM_NAME

The Client SHOULD set this to the title of the window in UTF8 encoding. If -set, the Window Manager should use this in preference to WM_NAME. -

_NET_WM_DESKTOP

_NET_WM_DESKTOP <desktop>, CARDINAL/32

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. -

The Window Manager should honor _NET_WM_DESKTOP whenever a withdrawn window -requests to be mapped. -

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 (window is the respective -window, type _NET_WM_DESKTOP, format 32, l[0]=<desktop>) -

The Window Manager MUST keep this property updated on all windows. -

_NET_WM_WINDOW_TYPE

_NET_WM_WINDOW_TYPE, ATOM[]/32

This MUST 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. -

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). - 

_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_DIALOG, ATOM
-_NET_WM_WINDOW_TYPE_NORMAL, ATOM

_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. -

_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. -

_NET_WM_WINDOW_TYPE_TOOLBAR and _NET_WM_WINDOW_TYPE_MENU indicate toolbar and -pinnable menu windows, respectively. -

_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. -

_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. -

_NET_WM_STATE

_NET_WM_STATE, ATOM[]

A list of hints describing the state window. 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. -

Possible atoms are: - 

_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_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. -

_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. -

_NET_WM_STATE_MAXIMIZED_{VERT,HORZ} indicates that the window is -{vertically,horizontally} maximised. -

_NET_WM_STATE_SHADED indicates that the window is shaded. -

_NET_WM_SKIP_TASKBAR indicates that a window should not be included on a -taskbar. -

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: - 

_NET_WM_STATE_REMOVE        0    /* remove/unset property */
-_NET_WM_STATE_ADD           1    /* add/set property */
-_NET_WM_STATE_TOGGLE        2    /* toggle property  */

See also the implementation notes on urgency and fixed size windows. -

_NET_WM_STRUT

_NET_WM_STRUT, CARDINAL[4]/32

This property MUST be set by the Client if the window is to reserve space at -the edge of the screen. The property is a 4-tupel of cardinals, one for 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. -

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. -

Rationale: A simple "do not cover" hint is not enough for dealing with e.g. -auto-hide panels. -

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. -

_NET_WM_ICON_GEOMETRY

_NET_WM_ICON_GEOMETRY, CARDINAL[4]

An array of x,y,w,h of type CARDINAL, format 32. 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. -

Rationale: This makes it possible for a window manager to display a nice -animation like morphing the window into its icon. -

_NET_WM_ICON

_NET_WM_ICON CARDINAL[][2+n]/32

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. -

This is an array of 32bit packed CARDINAL ARGB with high byte being A, low -byte being B. First two bytes are width, height. Data is in rows, left to -right and top to bottom. -

_NET_WM_PID

_NET_WM_PID CARDINAL/32

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. -

_NET_WM_HANDLED_ICONS

_NET_WM_HANDLED_ICONS

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. -

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Other Root Window Messages Window Manager Protocols
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4. Other Root Window Messages

4.1. _NET_CLOSE_WINDOW

_NET_CLOSE_WINDOW

Pagers wanting to close a window MUST send a _NET_CLOSE_WINDOW client + message request to the root window: + 

_NET_CLOSE_WINDOW
+  window = window to close
+  message_type = _NET_CLOSE_WINDOW
+  format = 32
+  data.l[0] = 0 /* may be used later */

The Window Manager MUST then attempt to close the window specified. +

Rationale: A Window Manager might be more clever than the usual method (send WM_DELETE message if the protocol is selected, XKillClient otherwise). It might introduce a timeout, for example. Instead of duplicating the code, the Window Manager can easily do the job. +

4.2. _NET_WM_MOVERESIZE

_NET_WM_MOVERESIZE
+  window = window to be moved or resized
+  message_type = _NET_WM_MOVERESIZE
+  format = 32
+  data.l[0] = x_root 
+  data.l[1] = y_root
+  data.l[2] = direction
+  data.l[3] = button

This message allows an application to initiate window movement or + resizing. This allows the application to define its own move and size + "grips", whilst letting the window manager control the actual operation. + This means that all moves/resizes can happen in a consistent manner as + defined by the WM. +

When sending this message in response to a button press event, button + SHOULD indicate the button which was pressed, x_root and y_root MUST + indicate the position of the button press with respect to the root + window and direction MUST indicate whether this is a move or resize + event, and if it is a resize event, which edges of the window the size + grip applies to. When sending this message in response to a key event, + the direction MUST indicate wether this this is a move or resize event + and the other fields are unused. + 

#define _NET_WM_MOVERESIZE_SIZE_TOPLEFT      0
+#define _NET_WM_MOVERESIZE_SIZE_TOP          1
+#define _NET_WM_MOVERESIZE_SIZE_TOPRIGHT     2
+#define _NET_WM_MOVERESIZE_SIZE_RIGHT        3
+#define _NET_WM_MOVERESIZE_SIZE_BOTTOMRIGHT  4
+#define _NET_WM_MOVERESIZE_SIZE_BOTTOM       5
+#define _NET_WM_MOVERESIZE_SIZE_BOTTOMLEFT   6
+#define _NET_WM_MOVERESIZE_SIZE_LEFT         7
+#define _NET_WM_MOVERESIZE_MOVE              8   /* movement only */
+#define _NET_WM_MOVERESIZE_SIZE_KEYBOARD     9   /* size via keyboard */
+#define _NET_WM_MOVERESIZE_MOVE_KEYBOARD    10   /* move via keyboard */

The Client MUST release all grabs prior to sending such message. +

The Window Manager can use the button field to determine the + events on which it terminates the operation initiated by the + _NET_WM_MOVERESIZE message. Since there is a race condition between + client sending the _NET_WM_MOVERESIZE message and the user releasing + the button, Window Managers are advised to offer some other means to + terminate the operation, e.g. by pressing the ESC key. +

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Root Window Properties (+Related Messages) Application Window Properties
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Extended Window Manager Hints
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Implementation notes

Desktop/workspace model

This spec assumes a desktop model that consists of one or more completely -independent desktops which may or may not be larger than the screen area. -When a desktop is larger than the screen it is left to the window manager if -it will implement scrolling or paging. -

File Manager desktop

This spec suggests implementing the file manager desktop by mapping a -desktop-sized window (no shape) to all desktops, with -_NET_WM_WINDOW_TYPE_DESKTOP. This makes the desktop focusable and greatly -simplifies implementation of the file manager. It is also faster than -managing lots of small shaped windows. The file manager draws the background -on this window. There should be a root property with a window handle for use -in applications that want to draw the background (xearth). -

Several GNOME file manager developers have accepted this model -

Implementing enhanced support for application transient windows

If the WM_TRANSIENT_FOR property is set to None or Root window, the window -should be treated as a transient for all other windows in the same group. It -has been noted that this is a slight ICCCM violation, but as this behaviour is -pretty standard for many toolkits and window managers, and is extremely -unlikely to break anything, it seems reasonable to document it as standard. -

Urgency

Dialog boxes should indicate their urgency level (information or warning) using the urgency bit in the WM_HINTS.flags property, as defined in the ICCCM. -

Fixed size windows

Windows can indicate that they are non-resizable by setting minheight = maxheight and minwidth = maxwidth in the ICCCM WM_NORMAL_HINTS property. The Window Manager MAY decorate such windows differently. -

Pagers and Taskbars

This specification attempts to make reasonable provisions for WM independant pagers and taskbars. Window Managers that require / desire additional functionality beyond what can be acheived using the mechanisms set out in this specification may choose to implement their own pagers, which communicates with the Window Manager using further, WM-specific hints, or some other means. -

Window Movement

According to the ICCCM, applications should not see unnecessary differences -between running with or without a window manager. Therefore window movements -for already mapped windows, such as ones requested by XMoveWindow(Display, -Window, X, Y) have to move the window Window to the coordinates (X, Y) and not -cause the window's window manager frame window to end up at (X, Y). -

Window-in-Window MDI

The authors of this specification acknowledge that there is no standard method to allow the Window Manager to manage windows that a part of a Window-in-Window MDI application. Application authors are advised to use some other form of MDI, or to propose a mechanism to be included in the next revision of this specification. -

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Window Manager Protocols  
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5. Application Window Properties

5.1. _NET_WM_NAME

_NET_WM_NAME, UTF8_STRING

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. +

5.2. _NET_WM_VISIBLE_NAME

_NET_WM_VISIBLE_NAME, UTF8_STRING

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. +

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. +

5.3. _NET_WM_ICON_NAME

_NET_WM_ICON_NAME, UTF8_STRING

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. +

5.4. _NET_WM_VISIBLE_ICON_NAME

_NET_WM_VISIBLE_ICON_NAME, UTF8_STRING

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. +

5.5. _NET_WM_DESKTOP

_NET_WM_DESKTOP desktop, CARDINAL/32

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. +

The Window Manager should honor _NET_WM_DESKTOP whenever a withdrawn window +requests to be mapped. +

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. +

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. +

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: + 

_NET_WM_DESKTOP
+  window  = the respective client window
+  message_type = _NET_WM_DESKTOP
+  format = 32
+  data.l[0] = new_desktop

The Window Manager MUST keep this property updated on all windows. +

5.6. _NET_WM_WINDOW_TYPE

_NET_WM_WINDOW_TYPE, ATOM[]/32

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. +

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). + 

_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

_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. +

_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. +

_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. +

_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. +

_NET_WM_WINDOW_TYPE_SPLASH indicates that the window is a splash screen +displayed as an application is starting up. +

_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. +

_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. +

5.7. _NET_WM_STATE

_NET_WM_STATE, ATOM[]

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. +

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. +

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. +

Possible atoms are: + 

_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

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. +

_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. +

_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. +

_NET_WM_STATE_MAXIMIZED_{VERT,HORZ} indicates that the window is +{vertically,horizontally} maximised. +

_NET_WM_STATE_SHADED indicates that the window is shaded. +

_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. +

_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. +

_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. +[1] +

_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. +

_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. +

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: + 

_NET_WM_STATE_REMOVE        0    /* remove/unset property */
+_NET_WM_STATE_ADD           1    /* add/set property */
+_NET_WM_STATE_TOGGLE        2    /* toggle property  */

See also the implementation notes on urgency and fixed size windows. +

5.8. _NET_WM_ALLOWED_ACTIONS

_NET_WM_ALLOWED_ACTIONS, ATOM[]

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. +

Possible atoms are: + 

_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

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. +

Note that the actions listed here are those that the Window +Manager 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. +

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. +

_NET_WM_ACTION_MOVE indicates that the window may be moved around the screen. +

_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.) +

_NET_WM_ACTION_SHADE indicates that the window may be shaded. +

_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. +

_NET_WM_ACTION_MAXIMIZE_HORZ indicates that the window may be maximized horizontally. +

_NET_WM_ACTION_MAXIMIZE_VERT indicates that the window may be maximized vertically. +

_NET_WM_ACTION_FULLSCREEN indicates that the window may be brought to + fullscreen mode. +

_NET_WM_ACTION_CHANGE_DESKTOP indicates that the window may be moved between desktops. +

_NET_WM_ACTION_CLOSE indicates that the window may be closed (i.e. a WM_DELETE_WINDOW +message may be sent). +

5.9. _NET_WM_STRUT

_NET_WM_STRUT, left, right, top, bottom, CARDINAL[4]/32

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. +

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. +

Rationale: A simple "do not cover" hint is not enough for dealing with e.g. +auto-hide panels. +

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. +

5.10. _NET_WM_ICON_GEOMETRY

_NET_WM_ICON_GEOMETRY, x, y, width, height, CARDINAL[4]/32

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. +

Rationale: This makes it possible for a window manager to display a nice +animation like morphing the window into its icon. +

5.11. _NET_WM_ICON

_NET_WM_ICON CARDINAL[][2+n]/32

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. +

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. +

5.12. _NET_WM_PID

_NET_WM_PID CARDINAL/32

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. +

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 +" to a string that forms the name of the machine running the client as +seen from the machine running the server" conformance to this +specification requires that WM_CLIENT_MACHINE be set to the fully-qualified domain +name of the client's host. +

See also the implementation notes on killing hung processes. +

5.13. _NET_WM_HANDLED_ICONS

_NET_WM_HANDLED_ICONS

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. +

Notes

[1]

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.

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2. Non-ICCCM features

There is a number of window management features or behaviours which are +not specified in the ICCCM, but are commonly met in modern Window Managers and Desktop Environments.

2.1. Additional States

The ICCCM allows Window Managers to implement additional window states, which will +appear to clients as substates of NormalState and IconicState. Two +commonly met examples are Maximized and Shaded. A Window Manager may implement these +as proper substates of NormalState and IconicState, or it may treat them +as independent flags, allowing e.g. a maximized window to be iconified +and to re-appear as maximized upon de-iconification.

2.1.1. Maximization

Maximization is a very old feature of Window Managers. There was even a ZoomedState +in early ICCCM drafts. Maximizing a window should give it as much of the +screen area as possible (this may not be the full screen area, but only +a smaller 'workarea', since the Window Manager may have reserved certain areas for other +windows). A Window Manager is expected to remember the geometry of a maximized window +and restore it upon de-maximization. Modern Window Managers typically allow separate +horizontal and vertical maximization.

With the introduction of the Xinerama extension in X11 R6.4, maximization +has become more involved. Xinerama allows a screen to span multiple +monitors in a freely configurable geometry. In such a setting, maximizing +a window would ideally not grow it to fill the whole screen, but only the +monitor it is shown on. There are of course borderline cases for windows +crossing monitor boundaries, and 'real' maximization to the full screen may +sometimes be useful.

2.1.2. Shading

Some Desktop Environments offer shading (also known as rollup) as an alternative to +iconfication. A shaded window typically shows only the titlebar, the client +window is hidden, thus shading is not useful for windows which are not +decorated with a titlebar.

2.2. Modality

The Window Manager _TRANSIENT_FOR hint of the ICCCM allows clients to specify that a +toplevel window may be closed before the client finishes. A typical example +of a transient window is a dialog. Some dialogs can be open for a long time, +while the user continues to work in the main window. Other dialogs have to be +closed before the user can continue to work in the main window. This property +is called modality. While clients can implement modal windows in an ICCCM +compliant way using the globally active input model, some Window Managers offer support +for handling modality.

2.3. Large Desktops

The Window Manager may offer to arrange the managed windows on a desktop that is +larger than the root window. The screen functions as a viewport on this large +desktop. Different policies regarding the positioning of the viewport on the +desktop can be implemented: The Window Manager may only allow to change the viewport +position in increments of the screen size (paging) or it may allow arbitrary +positions (scrolling).

To fulfill the ICCCM principle that clients should behave the same +regardless wether a Window Manager is running or not, Window Managers which +implement large desktops must interpret all client-provided geometries with +respect to the current viewport.

2.3.1. Implementation note

There are two options for implementing a large desktop: The first is to +keep the managed windows (or, if reparenting, their frames) as children +of the root window. Moving the viewport is achieved by moving all managed +windows in the opposite direction.

The second alternative is to reparent all managed windows to a dedicated +large window (somewhat inappropriately called a 'virtual root'). Moving +the viewport is then achieved by moving the virtual root in the opposite +direction.

Both alternatives are completely ICCCM compliant, although the second one +may be somewhat problematic for clients trying to figure out the Window Manager decorations +around their toplevel windows and for clients trying to draw background +images on the root window.

2.4. Sticky windows

A Window Manager which implements a large desktop typically offers a way for the user +to make certain windows 'stick to the glass', i.e. these windows will stay +at the same position on the screen when the viewport is moved.

2.5. Virtual Desktops

Most X servers have only a single screen. The Window Manager may virtualize this +resource and offer multiple so-called 'virtual desktops', of which only one +can be shown on the screen at a time. There is some variation among the +features of virtual desktop implementations. There may be a fixed number +of desktops, or new ones may be created dynamically. The size of the desktops +may be fixed or variable. If the desktops are larger than the root window, +their viewports (see Section 2.3) may be independent or forced to be at the same +position.

A Window Manager which implements virtual desktops generally offers a way for the user +to move clients between desktops. Clients may be allowed to occupy more than +one desktop simultaneously.

2.5.1. Implementation note

There are at least two options for implementing virtual desktops. +The first is to use multiple virtual roots (see Section 2.3.1) and change the current +desktop by manipulating the stacking order of the virtual roots. This is +completely ICCCM compliant, but has the issues outlined in Section 2.3.1

The second option is to keep all managed windows as children of the root +window and unmap the frames of those which are not on the current +desktop. Unmapped windows should be placed in IconicState, according to +the ICCCM. Windows which are actually iconified or minimized +should have the _NET_WM_STATE_HIDDEN property set, to +communicate to Pagers that the window should not be represented as +"onscreen."

2.6. Pagers

A pager offers a different UI for window management tasks. It shows a +miniature view of the desktop(s) representing managed windows by small +rectangles and allows the user to initiate various Window Manager actions by manipulating +these representations. Typically offered actions are activation (see Section 2.8), +moving, restacking, iconification, maximization and closing. On a large +desktop, the pager may offer a way to move the viewport. On virtual desktops, +the pager may offer ways to move windows between desktops and to change the +current desktop.

2.7. Taskbars

A taskbar offers another UI for window management tasks. It typically +represents client windows as a list of buttons labelled with the window +titles and possibly icons. Pressing a button initiates a Window Manager action on the +represented window, typical actions being activation and iconification. +In environments with a taskbar, icons are often considered inappropriate, +since the iconified windows are already represented in the taskbar.

2.8. Activation

In the X world, activating a window means to give it the input focus. +This may not be possible if the window is unmapped, because it is on a +different desktop. Thus, activating a window may involve additional steps +like moving it to the current desktop (or changing to the desktop the window +is on), deiconifying it or raising it.

2.9. Animated iconification

Some Window Managers display some form of animation when (de-)iconifying a window. +This may be a line drawing connecting the corners of the window with +the corners of the icon or the window may be opaquely moved and resized +on some trajectory joining the window location and the icon location.

2.10. Window-in-window MDI

Window-in-window MDI is a multiple document interface known from MS +Windows platforms. Programs employing it have a single top-level window +which contains a workspace which contains the subwindows for the open +documents. These subwindows are decorated with Window Manager frames and can be +manipulated within their parent window just like ordinary top-level +windows on the root window.

2.11. Layered stacking order

Some Window Managers keep the toplevel windows not in a single linear stack, +but subdivide the stack into several layers. There is a lot of variation +among the features of layered stacking order implementations. The number of +layers may or may not be fixed. The layer of a toplevel window may be explicit +and directly modifyable or derived from other properties of the window, e.g. +the type of the window. The stacking order may or may not +be strict, i.e. not allow the user to raise or lower windows beyond their +layer.

2.12. Scope of this spec

This spec tries to address the following issues:

  • Allow clients to influence their initial state with respect +to maximization, shading, stickyness, desktop, stacking order.

  • Improve the Window Managers ability to vary window +decorations and maintain the stacking order by allowing clients to hint the +Window Manager about the type of their windows.

  • Enable pagers and taskbars to be implemented as separate +clients and allow them to work with any compliant Window Manager.

This spec doesn't cover any of the following:

  • Other IPC mechanisms like ICE or Corba.

  • Window Manager configuration.

  • Window Manager documentation.

  • Clients appearing on a proper subset of desktops.

  • Window-in-window MDI.

The Window Manager is supposed to be in charge of window management +policy, so that there is consistent behaviour on the user's screen no matter +who wrote the clients.

The spec offers a lot of external control about Window Manager actions. +This is intended mainly to allow pagers, taskbars and similar Window Manager +UIs to be implemented as separate clients. "Ordinary" clients shouldn't use +these except maybe in response to a direct user request (i.e. setting a +config option to start maximized or specifying a -desk n cmdline +argument).

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 Root Window Properties (+Related Messages)
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Window Manager Protocols6. Window Manager Protocols

_NET_WM_PING6.1. _NET_WM_PING

This protocol allows the Window Manager to determine if the Client is still @@ -85,23 +93,14 @@ client window. >A Window Manager can use this protocol at any time by sending a client message as follows:

Extended Window Manager Hints
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type = ClientMessage
-window = <client window>
+window = the respective client window
 message_type = WM_PROTOCOLS
 format = 32
 data.l[0] = _NET_WM_PING
-data.l[1] = <timestamp>

A participating Client receiving this message MUST send it back to the root window immediately, by setting window = root, and calling XSendEvent. The @@ -112,6 +111,12 @@ to uniquely identify the ping. >The Window Manager MAY kill the Client (using _NET_WM_PID) if it fails to respond to this protocol within a reasonable time.

See also the implementation notes on killing hung processes. +

PrevImplementation notes
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7. Implementation notes

7.1. Desktop/workspace model

This spec assumes a desktop model that consists of one or more completely +independent desktops which may or may not be larger than the screen area. +When a desktop is larger than the screen it is left to the window manager if +it will implement scrolling or paging. +

7.2. File Manager desktop

This spec suggests implementing the file manager desktop by mapping a +desktop-sized window (no shape) to all desktops, with +_NET_WM_WINDOW_TYPE_DESKTOP. This makes the desktop focusable and greatly +simplifies implementation of the file manager. It is also faster than +managing lots of small shaped windows. The file manager draws the background +on this window. There should be a root property with a window handle for use +in applications that want to draw the background (xearth). +

7.3. Implementing enhanced support for application transient windows

If the WM_TRANSIENT_FOR property is set to None or Root window, the window +should be treated as a transient for all other windows in the same group. It +has been noted that this is a slight ICCCM violation, but as this behaviour is +pretty standard for many toolkits and window managers, and is extremely +unlikely to break anything, it seems reasonable to document it as standard. +

7.4. Urgency

Dialog boxes should indicate their urgency level (information or warning) using the urgency bit in the WM_HINTS.flags property, as defined in the ICCCM. +

7.5. Fixed size windows

Windows can indicate that they are non-resizable by setting minheight = maxheight and minwidth = maxwidth in the ICCCM WM_NORMAL_HINTS property. The Window Manager MAY decorate such windows differently. +

7.6. Pagers and Taskbars

This specification attempts to make reasonable provisions for WM independent pagers and taskbars. Window Managers that require / desire additional functionality beyond what can be achieved using the mechanisms set out in this specification may choose to implement their own pagers, which communicates with the Window Manager using further, WM-specific hints, or some other means. +

Pagers should decide whether to show a miniature version of a + window using the following guidelines: +

  • If either _NET_WM_STATE_SKIP_PAGER or + _NET_WM_STATE_HIDDEN are set on a window, then the + pager should not show that window. +

  • The pager may choose not to display windows with + certain semantic types; this spec has no + recommendations, but common practice is to avoid + displaying _NET_WM_WINDOW_TYPE_DOCK for example. +

  • If the _NET_WM_STATE_SKIP_PAGER and + _NET_WM_STATE_HIDDEN hints are not present, and the + window manager claims to support _NET_WM_STATE_HIDDEN, + then the window should be shown if it's in either + NormalState or IconicState. +

  • For window managers that do not support + _NET_WM_STATE_HIDDEN, the pager should + not show windows in IconicState. These window + managers are probably using an older version + of this specification. +

+

7.7. Window Movement

Window manager implementors should refer to the ICCCM for definitive +specifications of how to handle MapRequest and ConfigureRequest events. +However, since these aspects of the ICCCM are easily misread, this +document offers the following clarifications: +

  • Window managers MUST honour the win_gravity field of WM_NORMAL_HINTS + for both MapRequest _and_ ConfigureRequest events [1] +

  • Applications are free to change their win_gravity setting at any time +

    If application changes its gravity then Window manager should adjust the +reference point, so that client window will not move as the result. +For example if client's gravity was NorthWestGravity and reference point +was +at the top-left corner of the frame window, then after change of gravity to +the SouthEast reference point should be adjusted to point to the +lower-right +corner of the frame. +

  • When generating synthetic ConfigureNotify events, the position given + MUST be the top-left corner of the client window in relation to the + origin of the root window (i.e., ignoring win_gravity) [2] +

  • XMoveWindow(w,x,y) behaviour depends on the window gravity. Upon receiving a +request from client application the Window Manager calculates a new reference +point, based on the client window's own size, border width and gravity. For given client +window dimentions (width, height) and border width (bw), the reference point will be +placed at: +

    Gravity:ref_x:ref_y:
    StaticGravityxy
    NorthWestGravityx-bwy-bw
    NorthGravityx+(width/2)y-bw
    NorthEastGravityx+width+bwy-bw
    EastGravityx+width+bwy+(height/2)
    SouthEastGravityx+width+bwy+height+bw
    SouthGravityx+(width/2)y+height+bw
    SouthWestGravityx-bwy+height+bw
    WestGravityx-bwy+(height/2)
    CenterGravityx+(width/2)y+(height/2)

    The Window manager will use the reference point as calculated above, +until next XMoveWindow request. The Window Manager will place frame decorations +in the following position, based on the window gravity : +

    StaticGravity: +

    window's left top corner will be placed at (ref_x,ref_y) +

    NorthWestGravity: +

    window frame's left top corner will be placed at (ref_x,ref_y) +

    NorthGravity: +

    window frame's top side's center will be placed at (ref_x,ref_y) +

    NorthEastGravity: +

    window frame's right top corner will be placed at (ref_x,ref_y) +

    EastGravity: +

    window frame's right side's center will be placed at (ref_x,ref_y) +

    SouthWestGravity: +

    window frame's left bottom corner will be placed at (ref_x,ref_y) +

    SouthGravity: +

    window frame's bottom side's center will be placed at (ref_x,ref_y) +

    SouthEastGravity: +

    window frame's right bottom corner will be placed at (ref_x,ref_y) +

    WestGravity: +

    window frame's left side's center will be placed at (ref_x,ref_y) +

    CenterGravity: +

    window frame's center will be placed at (ref_x,ref_y) +

  • Implementation Note for Application developers: +

    When client window is resized - its reference point does not move. +So for example if window has SouthEastGravity and it is resized - +the bottom-right corner of its frame will not move but instead +top-left corner will be adjusted by the difference in size. +

  • Implementation Note for WM developers : +

    when calculating reference point at the time of initial placement - +initial window's width should be taken into consideration, as if it +was the frame for this window. +

[1] ICCCM Version 2.0, §4.1.2.3 and §4.1.5 +

[2] ICCCM Version 2.0, §4.2.3 +

7.8. Window-in-Window MDI

The authors of this specification acknowledge that there is no standard + method to allow the Window Manager to manage windows that are part of a + Window-in-Window MDI application. Application authors are advised to + use some other form of MDI, or to propose a mechanism to be included in + a future revision of this specification. +

7.9. Killing Hung Processes

If processes fail to respond to the _NET_WM_PING protocol _NET_WM_PID may be +used in combination with the ICCCM specified WM_CLIENT_MACHINE to +attempt to kill a process. +

WM_CLIENT_MACHINE must be set to the fully-qualified domain name of the client's +host. This would normally be retrieved using gethostname(2). When gethostname() +is not available on the client's platform implementors may use the value of the +nodename field of struct utsname as returned by uname(2). An example of how to +retrieve a value for WM_CLIENT_MACHINE: + 

int net_get_hostname (char *buf, size_t maxlen)
+{
+#ifdef HAVE_GETHOSTNAME
+	if (buf == NULL) return 0;
+
+	gethostname (buf, maxlen);
+	buf [maxlen - 1] = '\0';
+
+	return strlen(buf);
+#else
+	struct utsname name;
+	size_t len;
+
+	if (buf == NULL) return 0;
+
+	uname (&name);
+	len = strlen (name.nodename);
+
+	if (len >= maxlen) len = maxlen - 1;
+	strncpy (buf, name.nodename, len);
+	buf[len] = '\0';
+
+	return len;
+#endif
+}
+

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Window Manager Protocols References
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8. References

[1] F. Yergeau,"UTF-8, a transformation format of ISO 10646", RFC 2279 +

[2] David Rosenthal / Stuart W. Marks "Inter-Client Communication Conventions + Manual (Version 2.0)", X Consortium Standard, X Version 11, Release 6.3 +

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Implementation notes Copyright
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9. Copyright

Copyright (C) 2000, 2001, 2002 See Contributors List +

+Permission is hereby granted, free of charge, to any person +obtaining a copy of this software and associated documentation +files (the "Software"), to deal in the Software without +restriction, including without limitation the rights to use, +copy, modify, merge, publish, distribute, sublicense, and/or +sell copies of the Software, and to permit persons to whom +the Software is furnished to do so, subject to the following +conditions: +

+The above copyright notice and this permission notice shall +be included in all copies or substantial portions of the +Software. +

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY +KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE +WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE +AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS +BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, +WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE +OR OTHER DEALINGS IN THE SOFTWARE. +

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References Contributors
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10. Contributors

Sasha Vasko

Bradley T. Hughes

Dominik Vogt

Havoc Pennington

Jeff Raven

Jim Gettys

John Harper

Julian Adams

Matthias Ettrich

Micheal Rogers

Nathan Clemons

Tim Janik

Tomi Ollila

Sam Lantinga

The Rasterman

Paul Warren

Owen Taylor

Marko Macek

Greg Badros

Matthias Clasen

David Rosenthal

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Copyright Change history
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11. Change history

11.1. Changes since 1.1

  • Changed WM_CLIENT_NAME(STRING) from suggested to required for _NET_WM_PID. +

  • Specification and sample code for the content of WM_CLIENT_NAME(STRING). +

  • Added _NET_WM_WINDOW_TYPE_SPLASH, _NET_WM_WINDOW_TYPE_UTILITY. +

  • Added _NET_WM_STATE_FULLSCREEN. +

  • Added _NET_WM_ALLOWED_ACTIONS. +

  • Added _NET_WM_STATE_HIDDEN and clarified purpose of + _NET_WM_STATE_SKIP_PAGER and _NET_WM_STATE_SKIP_TASKBAR. Changed + section on virtual desktop implementation to suggest ICCCM compliance + regarding IconicState, using _NET_WM_STATE_HIDDEN to avoid confusion. + Added implementation note for pagers on when to display a window. +

  • Added button field and new directions for keyboard-initiated actions + to the _NET_WM_MOVERESIZE message. +

  • Added advice on removing _NET_WM_STATE and _NET_WM_DESKTOP when a window + is withdrawn. +

  • Added _NET_DESKTOP_LAYOUT to allow a Pager to specify inter-desktop geometry. +

  • Added _NET_SHOWING_DESKTOP. +

  • Added _NET_WM_STATE_FLOATING. +

11.2. Changes since 1.0

  • Fix doctype, add author info, update data. +

  • Change specification description wording to be more inclusive, and to reflect the joint nature of the specification. +

  • Fix miscellaneous typographical, grammar and spelling errors. +

  • Clarified _NET_SUPPORTED to include ALL atoms, not just the property names. +

  • Various corrections to use of MUST and SHOULD. +

  • Fix problem in _NET_WM_ICON where 'bytes' should have been 'cardinals' +

  • Replaced ISO-8559-1 characters with entities. +

11.3. Changes since 1.0pre5

  • Change history moved to end. +

  • UTF-8 Reference updated. +

  • Window Gravity information updated. +

  • Copyright Added. +

  • Minor typo corrections. +

11.4. Changes since 1.0pre4

  • Clarified the interpretation of client-provided geometries on large desktops. +

  • Added more explanation for _NET_DESKTOP_NAMES. +

  • Added _NET_WM_ICON_NAME and _NET_WM_VISIBLE_ICON_NAME. +

  • Tried to improve the wording of _NET_WM_STRUT explanation. +

  • Changed _NET_WORKAREA to an array of viewport-relative geometries. +

  • Updated list of "dependent" properties for _NET_NUMBER_OF_DESKTOPS +to include _NET_WORKAREA and _NET_DESKTOP_VIEWPORT. +

  • Tidied formatting of all client messages. +

11.5. Changes since 1.0pre3

  • Added information about common non-ICCCM features. +

  • Added explanation of sending messages to the root window. +

  • Removed XA_ prefix from type names. +

  • Clarified that "mapping order" refers to inital mapping +and specify the directions of both orders. +

  • Clarified that desktops have a common size specified by _NET_DESKTOP_GEOMETRY. +

  • Rewrote explanation of _NET_DESKTOP_VIEWPORT. +

  • Tidied formatting of _NET_CURRENT_DESKTOP. +

  • Replaced "window handle" by "window ID". +

  • Tidied formatting of _NET_WORKAREA. +

  • Rewrote the motivation for _NET_VIRTUAL_ROOTS. +

  • Added advice on Pointer grabs to _NET_WM_MOVERESIZE. +

  • Fixed typos in _NET_WM_STATE. +

  • Added _NET_WM_STATE_SKIP_PAGER. +

  • Tidied formatting of _NET_WM_STRUT. +

  • Tidied formatting of _NET_WM_ICON_GEOMETRY. +

11.6. Changes since 1.0pre2

  • _NET_SET_NUMBER_OF_DESKTOPS -> _NET_NUMBER_OF_DESKTOPS for consistency. +

  • _NET_WM_VISIBLE_NAME_STRING -> _NET_WM_VISIBLE_NAME for consistency. +

  • _NET_WM_STATE: added explanation of permitted extensions. Added explanation of +being set / not set. +

  • Spellchecked, corrected various typos. +

  • UTF8 -> UTF-8 for consistency. +

  • added references to the ICCCM an UTF-8 (incomplete). +

  • added data and event formats where missing. +

  • clarified _NET_SUPPORTING_WM_CHECK. +

  • fixed formatting of _NET_CLOSE_WINDOW message. +

11.7. Changes since 1.0pre1

  • Removed implementation note concerning Gnome's (potential) file manager behaviour. +

  • The Window Movement section of the implementation notes has been revised. +

11.8. Changes since 1.9f

  • Revised revision number for first accepted release 1.9XX -> 1.0preXX. +

  • Prerequisites for adoption of this specification added. +

  • Tidied formatting of _NET_CURRENT_DESKTOP for consistency. +

  • Tidied formatting of _NET_ACTIVE_WINDOW for consistency. Removed doubled text. +

  • Tidied formatting of _NET_WM_DESKTOP for consistency. +

  • Killing Hung Processes implementation note added. _NET_WM_PID and _NET_WM_PING now link to this. +

  • Clarified x_root and y_root meaning for _NET_WM_MOVERESIZE. +

  • Added contributor list. +

11.9. Changes since 1.9e

  • Added _NET_WM_VISIBLE_NAME_STRING +

  • Removed ambiguity from _NET_NUMBER_OF_DESKTOPS and _NET_DESKTOP_NAMES in combination. +

  • Set _NET_WM_MOVERESIZE format to 32 for consistency. +

  • Removed _NET_PROPERTIES. +

  • Removed comment from _NET_WM_MOVERESIZE. +

11.10. Changes since 1.9d

  • Added _NET_VIRTUAL_ROOTS +

  • Added note about ICCCM compliant window moves. +

  • Added _NET_WM_HANDLED_ICONS +

  • Added _NET_SUPPORTING_WM_CHECK +

  • Removed degrees of activation +

11.11. Changes since 1.9c

  • Removed packaging of hints into 2 X properties. Jim Gettys points out that the +performance gains of fewer round trips can be better achieved using Xlib +routines. +

  • Clarified that _NET_DESKTOP_VIEWPORT is in pixels +

  • _NET_DESKTOP_VIEWPORT is now an array, one for each desktop, to allow for +different active viewports on different desktops +

  • _NET_WM_STRUT now only applies on desktops on which the client is visible +

  • Introduced RFC 2119 language, and attempted to clarify the roles of the Window +Manager, Pagers and Applications +

  • Added _NET_WM_NAME +

  • _NET_DESKTOP_NAMES now in UTF8 +

  • Desktops now start from 0 +

  • Added _NET_WM_PID +

  • Added _NET_WM_PING protocol +

  • Added _NET_WM_STATE_SKIP_TASKBAR +

11.12. Changes since 1.9b

  • Removed _NET_NUMBER_OF_DESKTOPS client message, as it overlaps unnecessarily with _NET_{INSERT/DELETE}_DESKTOP.

  • Replaced _NET_WM_LAYER and _NET_WM_HINTS with _NET_WM_WINDOW_TYPE functional hint.

  • Changed _NET_WM_STATE to a list of atoms, for extensibility.

  • Expanded description of _NET_WORKAREA and _NET_WM_STRUT.

  • Removed _NET_WM_SIZEMOVE_NOTIFY protocol.

  • Added degrees of activation to _NET_ACTIVE_WINDOW client message

  • Added _NET_WM_ICON

  • My comments are in [[ ]]. Comments from Marko's draft are in [[MM: ]]

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Contributors  
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Extended Window Manager Hints
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Root Window Properties (+Related Messages)

_NET_SUPPORTED

_NET_SUPPORTED, ATOM[]/32

This property MUST be set by the Window Manager to indicate which hints it -supports. This assumes that backwards incompatible changes will not be made -to the hints (without being renamed). -

_NET_CLIENT_LIST

_NET_CLIENT_LIST, XA_WINDOW[]/32
-_NET_CLIENT_LIST_STACKING, XA_WINDOW[]/32

An array of all X Windows managed by the Window Manager. _NET_CLIENT_LIST has -mapping order. _NET_CLIENT_LIST_STACKING has stacking order. This property -SHOULD be set and updated by the Window Manager. -

_NET_NUMBER_OF_DESKTOPS

_NET_NUMBER_OF_DESKTOPS, CARDINAL/32

This property SHOULD be set and updated by the Window Manager to indicate the -number of virtual desktops. -

A Pager can insert or delete a certain desktop by sending a -_NET_{INSERT/DELETE}_DESKTOP client message to the root window. -

_NET_DESKTOP_GEOMETRY

_NET_DESKTOP_GEOMETRY width,height, CARDINAL[2]/32

Array of two cardinals that defines the width and height of each desktop in -pixels. This property SHOULD be set by the Window Manager. -

A Pager can change the desktop geometry by sending a _NET_DESKTOP_GEOMETRY client -message to the root window -

_NET_DESKTOP_VIEWPORT

_NET_DESKTOP_VIEWPORT x,y, CARDINAL[][2]/32

Array of two cardinals that define the top left corner of the current view in -pixel, for each desktop. For window managers that don't support paged -desktops, this MUST always be set to (0,0). -

A Pager can change the viewport for the current desktop by sending a -_NET_DESKTOP_VIEWPORT client message to the root window -

_NET_CURRENT_DESKTOP

_NET_CURRENT_DESKTOP <desktop>, CARDINAL[1]/32

The index of the current desktop, starts with desktop 0. This MUST be set and -updated by the Window Manager If a Pager wants to switch to another virtual -desktop, it MUST send a _NET_CURRENT_DESKTOP client message to the root window -(type _NET_CURRENT_DESKTOP, format 32, l[0]=<new index>) -

_NET_DESKTOP_NAMES

_NET_DESKTOP_NAMES

The names of all virtual desktops in UTF8 encoding. This property MAY be -changed by a Pager or the Window Mangaer at any time. When a desktop is added -or removed, the Window Manager MUST update this list. -

_NET_ACTIVE_WINDOW

_NET_ACTIVE_WINDOW, WINDOW/32

The window handle of the currently active window. This is a read-only -property set by the Window Manager. This is a read-only property set by the -window manager. If a client (for example, a taskbar) wants to activate -another window, it MUST send a _NET_ACTIVE_WINDOW client message to the root -window (type _NET_ACTIVE_WINDOW, format 32, l[0]=0 -/* may be used later */, window is the respective client window) -

_NET_WORKAREA

_NET_WORKAREA, CARDINAL[][4]/32
-

This property MUST be set by WM upon calculating the work area for each desktop (the first quadruple = desktop 1). Contains the left, right, top, bottom co-ordinates for each desktop. Work area SHOULD be used by desktop applications to place desktop icons apropriately. -

The window manager SHOULD calculate this space by taking the current page minus space occupied by dock and panel windows, as indicated by the _NET_WM_STRUT property set on client windows. -

_NET_SUPPORTING_WM_CHECK

_NET_SUPPORTING_WM_CHECK, XA_WINDOW/32

The Window Manager MUST set this property on the root window to be the ID of a child window created by the WM, to indicate that a compliant WM is active. The child window MUST also have the _NET_SUPPORTING_WM_CHECK property set with the same value. The child window MUST also have the _NET_WM_NAME property set to the name of the Window Manager. -

Rationale: The child window is used to guard against stale properties being left on the root window by a crashed WM. -

_NET_VIRTUAL_ROOTS

_NET_VIRTUAL_ROOTS, XA_WINDOW[]/32

The Window Manager MUST set this to a list of IDs for windows that are acting as virtual root windows. To implement virtual desktops, some window managers reparent client windows to a child of the root window. The property is present so that Pagers can determine which windows to watch for substructure notifies. -

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Extended Window Manager Hints Other Root Window Messages
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