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- The mailing list for KWin is email@example.com (https://mail.kde.org/mailman/listinfo/kwin). - If you want to develop KWin, see file HACKING. - If you want to check KWin's compliance with specifications, see file COMPLIANCE. - File CONFIGURATION includes some details on configuring KWin. - Below is some info for application developers about application interaction with the window manager, but it'd need some cleanup. This README is meant as an explanation of various window manager related mechanisms that application developers need to be aware of. As some of these concepts may be difficult to understand for people not having the required background knowledge (since sometimes it's difficult even for people who do have the knowledge), the mechanisms are first briefly explained, and then an example of fixing the various problems is given. For comments, questions, suggestions and whatever use the firstname.lastname@example.org mailing list. Table of contents: ================== - Window relations - how to make the window manager know which windows belong together - Focus stealing prevention - how to solve cases where focus stealing prevention doesn't work properly automatically Window relations: ================= (For now, this explanation of window relations is mainly meant for focus stealing prevention. To be extended later.) All windows created by an application should be organized in a tree with the root being the application's main window. Note that this is about toplevel windows, not widgets inside the windows. For example, if you have KWrite running, with a torn-off toolbar (i.e. a standalone toolbar), a file save dialog open, and the file save dialog showing a dialog for creating a directory, the window hiearchy should look like this: KWrite mainwindow / \ / \ file save dialog torn-off toolbar \ \ create directory dialog Each subwindow (i.e. all except for the KWrite mainwindow) points to its main window (which in turn may have another main window, as in the case of the file save dialog). When the window manager knows these relations, it can better arrange the windows (keeping subwindows above their main windows, preventing activation of a main window of a modal dialog, and similar). Failing to provide this information to the window manager may have various results, for example having dialogs positioned below the main window, The window property used by subwindows to point to their mainwindows is called WM_TRANSIENT_FOR. It can be seen by running 'xprop | grep WM_TRANSIENT_FOR' and clicking on a window. If the property is not present, the window does not (claim to) have any mainwindow. If the property is present, it's value is the window id of its main window; window id of any window can be found out by running 'xwininfo'. A window having WM_TRANSIENT_FOR poiting to another window is said to be transient for that window. In some cases, the WM_TRANSIENT_FOR property may not point to any other existing window, having value of 0, or pointing to the screen number ('xwininfo -root'). These special values mean that the window is transient for all other windows in its window group. This should be used only in rare cases, everytime a specific main window is known, WM_TRANSIENT_FOR should be pointing to it instead of using one of these special values. (The explanation why is beyond the scope of this document - just accept it as a fact.) With Qt, the WM_TRANSIENT_FOR property is set by Qt automatically, based on the toplevel widget's parent. If the toplevel widget is of a normal type (i.e. not a dialog, toolbar, etc.), Qt doesn't set WM_TRANSIENT_FOR on it. For special widgets, such as dialogs, WM_TRANSIENT_FOR is set to point to the widget's parent, if it has a specific parent, otherwise WM_TRANSIENT_FOR points to the root window. As already said above, WM_TRANSIENT_FOR poiting to the root window should be usually avoided, so everytime the widget's main widget is known, the widget should get it passed as a parent in its constructor. (TODO KDialog etc. classes should not have a default argument for the parent argument, and comments like 'just pass 0 as the parent' should go.) Focus stealing prevention: ========================== Since KDE3.2 KWin has a feature called focus stealing prevention. As the name suggests, it prevents unexpected changes of focus. With older versions of KWin, if any application opened a new dialog, it became active, and if the application's main window was on another virtual desktop, also the virtual desktop was changed. This was annoying, and also sometimes led to dialogs mistakenly being closed because they received keyboard input that was meant for the previously active window. The basic principle of focus stealing prevention is that the window with most recent user activity wins. Any window of an application will become active when being shown only if this application was the most recently used one. KWin itself, and some of the related kdecore classes should take care of the common cases, so usually there's no need for any special handling in applications. Qt/KDE applications, that is. Applications using other toolkits should in most cases work fine too. If they don't support the window property _NET_WM_USER_TIME, the window manager may fail to detect the user timestamp properly, resulting either in other windows becoming active while the user works with this application, or this application may sometimes steal focus (this second case should be very rare though). There are also cases where KDE applications needs special handling. The two most common cases are when windows relations are not setup properly to make KWin realize that they belong to the same application, and when the user activity is not represented by manipulating with the application windows themselves. Also note that focus stealing prevention implemented in the window manager can only help with focus stealing between different applications. If an application itself suddenly pops up a dialog, KWin cannot do anything about it, and its the application's job to handle this case. Window relations: ----------------- The common case here is when a dialog is shown for an application, but this dialog is not provided by the application itself, but by some other process. For example, dialogs with warnings about accepted cookies are provided by KCookieJar, instead of being shown by Konqueror. In the normal case, from KWin's point of view the cookie dialog would be an attempt of another application to show a dialog, and KWin wouldn't allow activation of this window. The solution is to tell the window manager about the relation between the Konqueror main window and the cookie dialog, by making the dialog point to the mainwindow. Note that this is not special to focus stealing prevention, subwindows such as dialogs, toolbars and similar should always point to their mainwindow. See the section on window relations for full description. The WM_TRANSIENT_FOR property that's set on dialogs to point to their mainwindow should in the cookie dialog case point to the Konqueror window for which it has been shown. This is solved in kcookiejar by including the window id in the DCOP call. When the cookie dialog is shown, its WM_TRANSIENT_FOR property is manually set using the XSetTransientForHint() call (see kdelibs/kioslave/http/kcookiejar/kcookiewin.cpp). The arguments to XSetTransientForHint() call are the X display (i.e. qt_xdisplay()), the window id on which the WM_TRANSIENT_FOR property is to be set (i.e. use QWidget::winId()), and the window id of the mainwindow. Simple short HOWTO: To put it simply: Let's say you have a daemon application that has DCOP call "showDialog( QString text )", and when this is called, it shows a dialog with the given text. This won't work properly with focus stealing prevention. The DCOP call should be changed to "showDialog( QString text, long id )". The caller should pass something like myMainWindow->winId() as the second argument. In the daemon, before the dialog is shown, a call to XSetTransientHint() should be added: XSetTransientForHint( qt_xdisplay(), dialog->winId(), id_of_mainwindow ); That's it. Non-standard user activity: --------------------------- The most common case in KDE will be DCOP calls. For example, KDesktop's DCOP call "KDesktopIface popupExecuteCommand". Executing this DCOP call e.g. from Konsole as 'dcop kdesktop KDesktopIface popupExecuteCommand" will lead to showing the minicli, but the last user activity timestamp gained from events sent by X server will be older than user activity timestamp of Konsole, and would normally result in minicli not being active. Therefore, before showing the minicli, kdesktop needs to call KApplication::updateUserTimestamp(). However, this shouldn't be done with all DCOP calls. If a DCOP call is not a result of direct user action, calling KApplication::updateUserTimestamp() would lead to focus stealing. For example, let's assume for a moment that KMail would use this DCOP call in case it detects the modem is not connected, allowing to you to start KPPP or whatever tool you use. If KMail would be configured to check mail every 10 minutes, this would lead to minicli possibly suddenly showing up at every check. Basically, doing the above change to kdesktop's minicli means that the popupExecuteCommand() DCOP call is only for user scripting. (TODO write about focus transferring?) Simply said, KApplication::updateUserTimestamp() should be called only as a result of user action. Unfortunately, I'm not aware of any universal way how to handle this, so every case will have to be considered separately.