3 This document is a work in progress and is in no way complete or accurate!
4 Its current purpose is in aiding the KWin NetWM audit for a future KWin release.
6 NetWM Compliance Document:
7 ==========================
9 Listed below are all the NetWM (or EWM) hints decided upon on freedesktop.org
10 (as of version 1.3draft, Nov 27, 2002) and KWin's current level of
11 compliance with the spec. Some parts also involve the pager and clients which
12 this document will cater for as well where applicable.
14 If you modify the level of NetWM compliance (via modification of kwin/*,
15 kdecore/netwm.* or kdecore/kwin.* etc.), or notice any new hints that
16 were added after version 1.2, please modify this document appropriately.
17 Properties are ordered in the table in the order they are found in the
18 specification. To list any important notes regarding a property, just
21 _NET_NUMBER_OF_DESKTOPS root window property done
22 +----------------------------------------------------------------+
23 | This property SHOULD be updated by the Window Manager to |
24 | indicate the number of virtual desktops. KWin DOES update this |
25 | property when the pager changes the number of desktops. |
26 +----------------------------------------------------------------+
28 If you have any questions regarding the specification, feel free to ask on the KWin
29 mailing list <kwin@kde.org>, or on the Window Manager Spec list <wm-spec-list@gnome.org>.
30 -- Karol <kszwed@kde.org>
37 * = KWin is compliant, but something else needs checking (e.g. Qt)
42 NETWM spec compliance (whole document):
44 ======================
47 + 2.3. Feature not implemented.
48 + 2.4. Feature not implemented.
50 + 2. (rest of the section)
52 This property is complete in the sence that all implemented properties
54 CHECKME : check it's complete
56 The spec requires that _NET_CLIENT_LIST contains the windows in their
57 initial mapping order, which is currently not true for NET::Desktop
59 Note that xprop lists only first element in WINDOW type properties.
61 Note that KWin does not use the virtual root windows technique,
62 so it doesn't set _NET_VIRTUAL_ROOTS at all.
64 KWin doesn't implement large desktops, so it ignores
65 the message, and only sets the property to the screen size.
67 KWin doesn't implement viewports, so it correctly sets
68 the property to (0,0) pairs and ignores the message.
72 KWin currently extends the message a bit, with data.l[0] being 1 or 2,
73 meaning 'from application'/'from pager', and data.l[1] contains
74 timestamp. This is used for focus stealing prevention purposes, and
75 will be proposed for next version of the spec.
79 KWin doesn't use the virtual roots technique for creating virtual
80 desktops, so it doesn't set the property.
86 Due to implementation details KWin actually allows moving or resizing
87 by keyboard when requested to be done by mouse, and vice versa.
93 / 5.6. The handling of _NET_WM_WINDOW_TYPE itself is correct and complete.
94 Supported window types: DESKTOP, DOCK, TOOLBAR, MENU, UTILITY,
95 SPLASH, DIALOG, NORMAL.
96 UTILITY should get better placement.
97 TOOLBAR - many parts in KDE still treat this as "tool" window.
98 - should the decoration be shown for the toolbars?
100 _KDE_NET_WM_WINDOW_TYPE_TOPMENU - this is used for implementing
101 standalone menubars for applications. Only the menubar
102 that is transient for the currently active window will be shown.
103 See KMenuBar class in libkdeui for details.
104 _KDE_NET_WM_WINDOW_TYPE_OVERRIDE - this seems to mean "this window
105 should be borderless", but it's actually used also for other
106 things, like fullscreen windows. The plan is to get rid of this
107 flawed thing as soon as possible.
109 The handling of _NET_WM_STATE itself is correct and complete.
110 Supported states: MODAL, MAXIMIZED_VERT, MAXIMIZED_HORZ, SHADED,
111 SKIP_TASKBAR, SKIP_PAGER, HIDDEN, ABOVE, BELOW.
112 STICKY is not supported, because KWin doesn't implement viewports.
113 BELOW - in order to make 'allow windows to cover the panel' feature
114 in Kicker work KWin interprets this state a bit differently
115 for DOCK windows. While normal DOCK windows are in their
116 extra layer above normal windows, making them BELOW doesn't
117 move them below normal windows, but only to the same layer, so
118 that windows can hide Kicker, but Kicker can be also raised
119 above the windows. A bit hacky, but it's not really against
120 the spec, and I have no better idea.
122 _NET_WM_STATE_STAYS_ON_TOP - has the same meaning like ABOVE,
123 and is deprecated in favour of it; it lacks the _KDE prefix
125 The handling of _NET_WM_ALLOWED_ACTIONS itself is correct and complete.
126 Supported actions: MOVE, RESIZE, MINIMIZE, SHADE, MAXIMIZE_HORZ,
127 MAXIMIZE_VERT, CHANGE_DESKTOP, CLOSE
128 STICK is not supported, because KWin does not implement viewports.
129 Kicker etc. need to be updated.
132 Property is not used in KWin.
133 Kicker needs to be checked.
135 KWin's handling of the property is correct.
136 Qt should be checked.
139 Property is not used in KWin, KWin never provides icons for iconified windows.
140 Kicker or its taskbar don't set it either. However, the property is flawed,
141 and should be replaced by manager selection or similar mechanism.
145 The urgency hint is mapped to the _NET_WM_DEMANDS_ATTENTION flag.
147 Qt often sets maximum size smaller than minimum size. This seems to be caused
148 by delayed layout calculations.
150 Kicker should be checked.
152 + 7. (rest of the section)
155 + _NET_WM_FULLSCREEN_MONITORS Status: Done.
156 +----------------------------------------------------------------+
157 | The Window Manager MUST keep this list updated to reflect the |
158 | current state of the window. The application window sends this |
159 | in a ClientMessage to the root window. KWin persists this info |
160 | both internally as well as against the application window. |
161 | This data is used to spread the fullscreen application window |
162 | across the requested topology, if valid. |
163 +----------------------------------------------------------------+
165 ICCCM spec compliance (whole document):
167 ======================
170 KWin uses KWIN_RUNNING atom that's missing the leading underscore.
171 Some parts of KDE perhaps may be missing the leading underscore.
174 + 1. (rest of the section)
175 + 2.8. kmanagerselection.* in kdecore
176 + 2. (rest of the section)
178 * - patch sent to TT to make QClipboard sufficiently compliant
180 Feature not supported, obsolete.
184 Used as a fallback for _NET_WM_NAME.
186 Used as a fallback for _NET_WM_ICON_NAME.
188 ? - PSize, PPosition, USize, UPosition
189 ? - clients - Qt simply sets both
190 + - PWinGravity - window geometry constraints have higher priority than gravity
191 / - PBaseSize - PMinSize is not used as a fallback for size increments
194 + - input - see 4.1.7
196 + - icon - feature not supported
198 + - urgency - mapped to _NET_WM_DEMANDS_ATTENTION
199 / 4.1.2.5 - it should be checked it's used correctly in Kicker etc.
200 / 4.1.2.6 - should be checked
201 NETWM section 7.3. is supported too, even though it's a slight ICCCM violation.
205 + 4.1.2.9 - handled by Xlib call
208 Feature not supported (4.1.2.4 - icons)
209 * 4.1.4 it should be checked Qt/KDE clients handle this properly
215 KWin only installs colormap required by the active window.
217 Feature not supported, except for WM_ICON_NAME as a fallback for _NET_WM_ICON_NAME.
220 Window groups are only used for supporting NETWM section 7.3.
223 Qt doesn't set revert-to to Parent.
224 + 4.2.8.1 frozen clients may be XKill-ed upon a user request though
227 + 4. (rest of the section)
228 + 5.3. not KWin related
229 + 5. (rest of the section )
231 ? 6.2. clients thing - Qt perhaps should force rule 2.
233 ? 6. (rest of the section)
234 + 7. - no idea what it is, but it doesn't seem to be KWin related
238 KDE-specific extensions (for completeness):
241 ==========================================================================
242 _KDE_WM_CHANGE_STATE root window message
243 _KDE_NET_SYSTEM_TRAY_WINDOWS root window property
244 _KDE_NET_WM_SYSTEM_TRAY_WINDOW_FOR window property
245 _KDE_NET_WM_FRAME_STRUT window property
248 - has no vendor prefix even though it's not part of the spec
249 _NET_WM_STATE_STAYS_ON_TOP
251 - has no vendor prefix even though it's not part of the spec
252 - deprecated in favor of _NET_WM_STATE_KEEP_ABOVE
253 _KDE_NET_WM_WINDOW_TYPE_OVERRIDE
254 - window type, makes the window borderless
255 - unclear semantics, used also for fullscreen windows
256 - deprecated in favor of other window types
258 ==========================================================================