activation.cpp

00001 /*****************************************************************
00002  KWin - the KDE window manager
00003  This file is part of the KDE project.
00004 
00005 Copyright (C) 1999, 2000 Matthias Ettrich <ettrich@kde.org>
00006 Copyright (C) 2003 Lubos Lunak <l.lunak@kde.org>
00007 
00008 You can Freely distribute this program under the GNU General Public
00009 License. See the file "COPYING" for the exact licensing terms.
00010 ******************************************************************/
00011 
00012 /*
00013 
00014  This file contains things relevant to window activation and focus
00015  stealing prevention.
00016 
00017 */
00018 
00019 #include "client.h"
00020 #include "workspace.h"
00021 
00022 #include <fixx11h.h>
00023 #include <qpopupmenu.h>
00024 #include <kxerrorhandler.h>
00025 #include <kstartupinfo.h>
00026 #include <kstringhandler.h>
00027 #include <klocale.h>
00028 
00029 #include "notifications.h"
00030 #include "atoms.h"
00031 #include "group.h"
00032 #include "rules.h"
00033 
00034 extern Time qt_x_time;
00035 
00036 namespace KWinInternal
00037 {
00038 
00039 /*
00040  Prevention of focus stealing:
00041 
00042  KWin tries to prevent unwanted changes of focus, that would result
00043  from mapping a new window. Also, some nasty applications may try
00044  to force focus change even in cases when ICCCM 4.2.7 doesn't allow it
00045  (e.g. they may try to activate their main window because the user
00046  definitely "needs" to see something happened - misusing
00047  of QWidget::setActiveWindow() may be such case).
00048 
00049  There are 4 ways how a window may become active:
00050  - the user changes the active window (e.g. focus follows mouse, clicking
00051    on some window's titlebar) - the change of focus will
00052    be done by KWin, so there's nothing to solve in this case
00053  - the change of active window will be requested using the _NET_ACTIVE_WINDOW
00054    message (handled in RootInfo::changeActiveWindow()) - such requests
00055    will be obeyed, because this request is meant mainly for e.g. taskbar
00056    asking the WM to change the active window as a result of some user action.
00057    Normal applications should use this request only rarely in special cases.
00058    See also below the discussion of _NET_ACTIVE_WINDOW_TRANSFER.
00059  - the change of active window will be done by performing XSetInputFocus()
00060    on a window that's not currently active. ICCCM 4.2.7 describes when
00061    the application may perform change of input focus. In order to handle
00062    misbehaving applications, KWin will try to detect focus changes to
00063    windows that don't belong to currently active application, and restore
00064    focus back to the currently active window, instead of activating the window
00065    that got focus (unfortunately there's no way to FocusChangeRedirect similar
00066    to e.g. SubstructureRedirect, so there will be short time when the focus
00067    will be changed). The check itself that's done is
00068    Workspace::allowClientActivation() (see below).
00069  - a new window will be mapped - this is the most complicated case. If
00070    the new window belongs to the currently active application, it may be safely
00071    mapped on top and activated. The same if there's no active window,
00072    or the active window is the desktop. These checks are done by
00073    Workspace::allowClientActivation().
00074     Following checks need to compare times. One time is the timestamp
00075    of last user action in the currently active window, the other time is
00076    the timestamp of the action that originally caused mapping of the new window
00077    (e.g. when the application was started). If the first time is newer than
00078    the second one, the window will not be activated, as that indicates
00079    futher user actions took place after the action leading to this new
00080    mapped window. This check is done by Workspace::allowClientActivation().
00081     There are several ways how to get the timestamp of action that caused
00082    the new mapped window (done in Client::readUserTimeMapTimestamp()) :
00083      - the window may have the _NET_WM_USER_TIME property. This way
00084        the application may either explicitly request that the window is not
00085        activated (by using 0 timestamp), or the property contains the time
00086        of last user action in the application.
00087      - KWin itself tries to detect time of last user action in every window,
00088        by watching KeyPress and ButtonPress events on windows. This way some
00089        events may be missed (if they don't propagate to the toplevel window),
00090        but it's good as a fallback for applications that don't provide
00091        _NET_WM_USER_TIME, and missing some events may at most lead
00092        to unwanted focus stealing.
00093      - the timestamp may come from application startup notification.
00094        Application startup notification, if it exists for the new mapped window,
00095        should include time of the user action that caused it.
00096      - if there's no timestamp available, it's checked whether the new window
00097        belongs to some already running application - if yes, the timestamp
00098        will be 0 (i.e. refuse activation)
00099      - if the window is from session restored window, the timestamp will
00100        be 0 too, unless this application was the active one at the time
00101        when the session was saved, in which case the window will be
00102        activated if there wasn't any user interaction since the time
00103        KWin was started.
00104      - as the last resort, the _KDE_NET_USER_CREATION_TIME timestamp
00105        is used. For every toplevel window that is created (see CreateNotify
00106        handling), this property is set to the at that time current time.
00107        Since at this time it's known that the new window doesn't belong
00108        to any existing application (better said, the application doesn't
00109        have any other window mapped), it is either the very first window
00110        of the application, or its the only window of the application
00111        that was hidden before. The latter case is handled by removing
00112        the property from windows before withdrawing them, making
00113        the timestamp empty for next mapping of the window. In the sooner
00114        case, the timestamp will be used. This helps in case when
00115        an application is launched without application startup notification,
00116        it creates its mainwindow, and starts its initialization (that
00117        may possibly take long time). The timestamp used will be older
00118        than any user action done after launching this application.
00119      - if no timestamp is found at all, the window is activated.
00120     The check whether two windows belong to the same application (same
00121    process) is done in Client::belongToSameApplication(). Not 100% reliable,
00122    but hopefully 99,99% reliable.
00123 
00124  As a somewhat special case, window activation is always enabled when
00125  session saving is in progress. When session saving, the session
00126  manager allows only one application to interact with the user.
00127  Not allowing window activation in such case would result in e.g. dialogs
00128  not becoming active, so focus stealing prevention would cause here
00129  more harm than good.
00130 
00131  Windows that attempted to become active but KWin prevented this will
00132  be marked as demanding user attention. They'll get
00133  the _NET_WM_STATE_DEMANDS_ATTENTION state, and the taskbar should mark
00134  them specially (blink, etc.). The state will be reset when the window
00135  eventually really becomes active.
00136 
00137  There are one more ways how a window can become obstrusive, window stealing
00138  focus: By showing above the active window, by either raising itself,
00139  or by moving itself on the active desktop.
00140      - KWin will refuse raising non-active window above the active one,
00141          unless they belong to the same application. Applications shouldn't
00142          raise their windows anyway (unless the app wants to raise one
00143          of its windows above another of its windows).
00144      - KWin activates windows moved to the current desktop (as that seems
00145          logical from the user's point of view, after sending the window
00146          there directly from KWin, or e.g. using pager). This means
00147          applications shouldn't send their windows to another desktop
00148          (SELI TODO - but what if they do?)
00149 
00150  Special cases I can think of:
00151     - konqueror reusing, i.e. kfmclient tells running Konqueror instance
00152         to open new window
00153         - without focus stealing prevention - no problem
00154         - with ASN (application startup notification) - ASN is forwarded,
00155             and because it's newer than the instance's user timestamp,
00156             it takes precedence
00157         - without ASN - user timestamp needs to be reset, otherwise it would
00158             be used, and it's old; moreover this new window mustn't be detected
00159             as window belonging to already running application, or it wouldn't
00160             be activated - see Client::sameAppWindowRoleMatch() for the (rather ugly)
00161             hack
00162     - konqueror preloading, i.e. window is created in advance, and kfmclient
00163         tells this Konqueror instance to show it later
00164         - without focus stealing prevention - no problem
00165         - with ASN - ASN is forwarded, and because it's newer than the instance's
00166             user timestamp, it takes precedence
00167         - without ASN - user timestamp needs to be reset, otherwise it would
00168             be used, and it's old; also, creation timestamp is changed to
00169             the time the instance starts (re-)initializing the window,
00170             this ensures creation timestamp will still work somewhat even in this case
00171     - KUniqueApplication - when the window is already visible, and the new instance
00172         wants it to activate
00173         - without focus stealing prevention - _NET_ACTIVE_WINDOW - no problem
00174         - with ASN - ASN is forwarded, and set on the already visible window, KWin
00175             treats the window as new with that ASN
00176         - without ASN - _NET_ACTIVE_WINDOW as application request is used,
00177                 and there's no really usable timestamp, only timestamp
00178                 from the time the (new) application instance was started,
00179                 so KWin will activate the window *sigh*
00180                 - the bad thing here is that there's absolutely no chance to recognize
00181                     the case of starting this KUniqueApp from Konsole (and thus wanting
00182                     the already visible window to become active) from the case
00183                     when something started this KUniqueApp without ASN (in which case
00184                     the already visible window shouldn't become active)
00185                 - the only solution is using ASN for starting applications, at least silent
00186                     (i.e. without feedback)
00187     - when one application wants to activate another application's window (e.g. KMail
00188         activating already running KAddressBook window ?)
00189         - without focus stealing prevention - _NET_ACTIVE_WINDOW - no problem
00190         - with ASN - can't be here, it's the KUniqueApp case then
00191         - without ASN - _NET_ACTIVE_WINDOW as application request should be used,
00192             KWin will activate the new window depending on the timestamp and
00193             whether it belongs to the currently active application
00194 
00195  _NET_ACTIVE_WINDOW usage:
00196  data.l[0]= 1 ->app request
00197           = 2 ->pager request
00198           = 0 - backwards compatibility
00199  data.l[1]= timestamp
00200 */
00201 
00202 
00203 //****************************************
00204 // Workspace
00205 //****************************************
00206 
00207 
00216 void Workspace::setActiveClient( Client* c, allowed_t )
00217     {
00218     if ( active_client == c )
00219         return;
00220     if( active_popup && active_popup_client != c && set_active_client_recursion == 0 ) 
00221         closeActivePopup();
00222     StackingUpdatesBlocker blocker( this );
00223     ++set_active_client_recursion;
00224     if( active_client != NULL )
00225         { // note that this may call setActiveClient( NULL ), therefore the recursion counter
00226         active_client->setActive( false, !c || !c->isModal() || c != active_client->transientFor() );
00227         }
00228     active_client = c;
00229     Q_ASSERT( c == NULL || c->isActive());
00230     if( active_client != NULL )
00231         last_active_client = active_client;
00232     if ( active_client ) 
00233         {
00234         updateFocusChains( active_client, FocusChainMakeFirst );
00235         active_client->demandAttention( false );
00236         }
00237     pending_take_activity = NULL;
00238 
00239     updateCurrentTopMenu();
00240     updateToolWindows( false );
00241     if( c )
00242         disableGlobalShortcutsForClient( c->rules()->checkDisableGlobalShortcuts( false ));
00243     else
00244         disableGlobalShortcutsForClient( false );
00245 
00246     updateStackingOrder(); // e.g. fullscreens have different layer when active/not-active
00247 
00248     rootInfo->setActiveWindow( active_client? active_client->window() : 0 );
00249     updateColormap();
00250     --set_active_client_recursion;
00251     }
00252 
00264 void Workspace::activateClient( Client* c, bool force )
00265     {
00266     if( c == NULL )
00267         {
00268         focusToNull();
00269         setActiveClient( NULL, Allowed );
00270         return;
00271         }
00272     raiseClient( c );
00273     if (!c->isOnDesktop(currentDesktop()) )
00274         {
00275         ++block_focus;
00276         setCurrentDesktop( c->desktop() );
00277         --block_focus;
00278         }
00279     if( c->isMinimized())
00280         c->unminimize();
00281 
00282 // TODO force should perhaps allow this only if the window already contains the mouse
00283     if( options->focusPolicyIsReasonable() || force )
00284         requestFocus( c, force );
00285 
00286     // Don't update user time for clients that have focus stealing workaround.
00287     // As they usually belong to the current active window but fail to provide
00288     // this information, updating their user time would make the user time
00289     // of the currently active window old, and reject further activation for it.
00290     // E.g. typing URL in minicli which will show kio_uiserver dialog (with workaround),
00291     // and then kdesktop shows dialog about SSL certificate.
00292     // This needs also avoiding user creation time in Client::readUserTimeMapTimestamp().
00293     if( !c->ignoreFocusStealing())
00294         c->updateUserTime();
00295     }
00296 
00304 void Workspace::requestFocus( Client* c, bool force )
00305     {
00306     takeActivity( c, ActivityFocus | ( force ? ActivityFocusForce : 0 ), false);
00307     }
00308     
00309 void Workspace::takeActivity( Client* c, int flags, bool handled )
00310     {
00311      // the 'if( c == active_client ) return;' optimization mustn't be done here
00312     if (!focusChangeEnabled() && ( c != active_client) )
00313         flags &= ~ActivityFocus;
00314 
00315     if ( !c ) 
00316         {
00317         focusToNull();
00318         return;
00319         }
00320 
00321     if( flags & ActivityFocus )
00322         {
00323         Client* modal = c->findModal();
00324         if( modal != NULL && modal != c )   
00325             { 
00326             if( !modal->isOnDesktop( c->desktop()))
00327                 {
00328                 modal->setDesktop( c->desktop());
00329                 if( modal->desktop() != c->desktop()) // forced desktop
00330                     activateClient( modal );
00331                 }
00332             // if the click was inside the window (i.e. handled is set),
00333             // but it has a modal, there's no need to use handled mode, because
00334             // the modal doesn't get the click anyway
00335             // raising of the original window needs to be still done
00336             if( flags & ActivityRaise )
00337                 raiseClient( c );
00338             c = modal;
00339             handled = false;
00340             }
00341         cancelDelayFocus();
00342         }
00343     if ( !( flags & ActivityFocusForce ) && ( c->isTopMenu() || c->isDock() || c->isSplash()) )
00344         flags &= ~ActivityFocus; // toplevel menus and dock windows don't take focus if not forced
00345     if( c->isShade())
00346         {
00347         if( c->wantsInput() && ( flags & ActivityFocus ))
00348             {
00349         // client cannot accept focus, but at least the window should be active (window menu, et. al. )
00350             c->setActive( true );
00351             focusToNull();
00352             }
00353         flags &= ~ActivityFocus;
00354         handled = false; // no point, can't get clicks
00355         }
00356     if( !c->isShown( true )) // shouldn't happen, call activateClient() if needed
00357         {
00358         kdWarning( 1212 ) << "takeActivity: not shown" << endl;
00359         return;
00360         }
00361     c->takeActivity( flags, handled, Allowed );
00362     if( !c->isOnScreen( active_screen ))
00363         active_screen = c->screen();
00364     }
00365 
00366 void Workspace::handleTakeActivity( Client* c, Time /*timestamp*/, int flags )
00367     {
00368     if( pending_take_activity != c ) // pending_take_activity is reset when doing restack or activation
00369         return;
00370     if(( flags & ActivityRaise ) != 0 )
00371         raiseClient( c );
00372     if(( flags & ActivityFocus ) != 0 && c->isShown( false ))
00373         c->takeFocus( Allowed );
00374     pending_take_activity = NULL;
00375     }
00376 
00384 void Workspace::clientHidden( Client* c )
00385     {
00386     assert( !c->isShown( true ) || !c->isOnCurrentDesktop());
00387     activateNextClient( c );
00388     }
00389 
00390 // deactivates 'c' and activates next client
00391 bool Workspace::activateNextClient( Client* c )
00392     {
00393     // if 'c' is not the active or the to-become active one, do nothing
00394     if( !( c == active_client
00395             || ( should_get_focus.count() > 0 && c == should_get_focus.last())))
00396         return false;
00397     closeActivePopup();
00398     if( c != NULL )
00399         {
00400         if( c == active_client )
00401             setActiveClient( NULL, Allowed );
00402         should_get_focus.remove( c );
00403         }
00404     if( focusChangeEnabled())
00405         {
00406         if ( options->focusPolicyIsReasonable())
00407             { // search the focus_chain for a client to transfer focus to
00408               // if 'c' is transient, transfer focus to the first suitable mainwindow
00409             Client* get_focus = NULL;
00410             const ClientList mainwindows = ( c != NULL ? c->mainClients() : ClientList());
00411             for( ClientList::ConstIterator it = focus_chain[currentDesktop()].fromLast();
00412                  it != focus_chain[currentDesktop()].end();
00413                  --it )
00414                 {
00415                 if( !(*it)->isShown( false ) || !(*it)->isOnCurrentDesktop())
00416                     continue;
00417                 if( options->separateScreenFocus )
00418                     {
00419                     if( c != NULL && !(*it)->isOnScreen( c->screen()))
00420                         continue;
00421                     if( c == NULL && !(*it)->isOnScreen( activeScreen()))
00422                         continue;
00423                     }
00424                 if( mainwindows.contains( *it ))
00425                     {
00426                     get_focus = *it;
00427                     break;
00428                     }
00429                 if( get_focus == NULL )
00430                     get_focus = *it;
00431                 }
00432             if( get_focus == NULL )
00433                 get_focus = findDesktop( true, currentDesktop());
00434             if( get_focus != NULL )
00435                 requestFocus( get_focus );
00436             else
00437                 focusToNull();
00438             }
00439             else
00440                 return false;
00441         }
00442     else
00443         // if blocking focus, move focus to the desktop later if needed
00444         // in order to avoid flickering
00445         focusToNull();
00446     return true;
00447     }
00448 
00449 void Workspace::setCurrentScreen( int new_screen )
00450     {
00451     if (new_screen < 0 || new_screen > numScreens())
00452         return;
00453     if ( !options->focusPolicyIsReasonable())
00454         return;
00455     closeActivePopup();
00456     Client* get_focus = NULL;
00457     for( ClientList::ConstIterator it = focus_chain[currentDesktop()].fromLast();
00458          it != focus_chain[currentDesktop()].end();
00459          --it )
00460         {
00461         if( !(*it)->isShown( false ) || !(*it)->isOnCurrentDesktop())
00462             continue;
00463         if( !(*it)->screen() == new_screen )
00464             continue;
00465         get_focus = *it;
00466         break;
00467         }
00468     if( get_focus == NULL )
00469         get_focus = findDesktop( true, currentDesktop());
00470     if( get_focus != NULL && get_focus != mostRecentlyActivatedClient())
00471         requestFocus( get_focus );
00472     active_screen = new_screen;
00473     }
00474 
00475 void Workspace::gotFocusIn( const Client* c )
00476     {
00477     if( should_get_focus.contains( const_cast< Client* >( c )))
00478         { // remove also all sooner elements that should have got FocusIn,
00479       // but didn't for some reason (and also won't anymore, because they were sooner)
00480         while( should_get_focus.first() != c )
00481             should_get_focus.pop_front();
00482         should_get_focus.pop_front(); // remove 'c'
00483         }
00484     }
00485 
00486 void Workspace::setShouldGetFocus( Client* c )
00487     {
00488     should_get_focus.append( c );
00489     updateStackingOrder(); // e.g. fullscreens have different layer when active/not-active
00490     }
00491 
00492 // focus_in -> the window got FocusIn event
00493 // session_active -> the window was active when saving session
00494 bool Workspace::allowClientActivation( const Client* c, Time time, bool focus_in )
00495     {
00496     // options->focusStealingPreventionLevel :
00497     // 0 - none    - old KWin behaviour, new windows always get focus
00498     // 1 - low     - focus stealing prevention is applied normally, when unsure, activation is allowed
00499     // 2 - normal  - focus stealing prevention is applied normally, when unsure, activation is not allowed,
00500     //              this is the default
00501     // 3 - high    - new window gets focus only if it belongs to the active application,
00502     //              or when no window is currently active
00503     // 4 - extreme - no window gets focus without user intervention
00504     if( time == -1U )
00505         time = c->userTime();
00506     int level = c->rules()->checkFSP( options->focusStealingPreventionLevel );
00507     if( session_saving && level <= 2 ) // <= normal
00508         {
00509         return true;
00510         }
00511     Client* ac = mostRecentlyActivatedClient();
00512     if( focus_in )
00513         {
00514         if( should_get_focus.contains( const_cast< Client* >( c )))
00515             return true; // FocusIn was result of KWin's action
00516         // Before getting FocusIn, the active Client already
00517         // got FocusOut, and therefore got deactivated.
00518         ac = last_active_client;
00519         }
00520     if( time == 0 ) // explicitly asked not to get focus
00521         return false;
00522     if( level == 0 ) // none
00523         return true;
00524     if( level == 4 ) // extreme
00525         return false;
00526     if( !c->isOnCurrentDesktop())
00527         return false; // allow only with level == 0
00528     if( c->ignoreFocusStealing())
00529         return true;
00530     if( ac == NULL || ac->isDesktop())
00531         {
00532 //        kdDebug( 1212 ) << "Activation: No client active, allowing" << endl;
00533         return true; // no active client -> always allow
00534         }
00535     // TODO window urgency  -> return true?
00536     if( Client::belongToSameApplication( c, ac, true ))
00537         {
00538 //        kdDebug( 1212 ) << "Activation: Belongs to active application" << endl;
00539         return true;
00540         }
00541     if( level == 3 ) // high
00542         return false;
00543     if( time == -1U )  // no time known
00544         {
00545 //        kdDebug( 1212 ) << "Activation: No timestamp at all" << endl;
00546         if( level == 1 ) // low
00547             return true;
00548         // no timestamp at all, don't activate - because there's also creation timestamp
00549         // done on CreateNotify, this case should happen only in case application
00550         // maps again already used window, i.e. this won't happen after app startup
00551         return false; 
00552         }
00553     // level == 2 // normal
00554     Time user_time = ac->userTime();
00555 //    kdDebug( 1212 ) << "Activation, compared:" << c << ":" << time << ":" << user_time
00556 //        << ":" << ( timestampCompare( time, user_time ) >= 0 ) << endl;
00557     return timestampCompare( time, user_time ) >= 0; // time >= user_time
00558     }
00559 
00560 // basically the same like allowClientActivation(), this time allowing
00561 // a window to be fully raised upon its own request (XRaiseWindow),
00562 // if refused, it will be raised only on top of windows belonging
00563 // to the same application
00564 bool Workspace::allowFullClientRaising( const Client* c, Time time )
00565     {
00566     int level = c->rules()->checkFSP( options->focusStealingPreventionLevel );
00567     if( session_saving && level <= 2 ) // <= normal
00568         {
00569         return true;
00570         }
00571     Client* ac = mostRecentlyActivatedClient();
00572     if( level == 0 ) // none
00573         return true;
00574     if( level == 4 ) // extreme
00575         return false;
00576     if( ac == NULL || ac->isDesktop())
00577         {
00578 //        kdDebug( 1212 ) << "Raising: No client active, allowing" << endl;
00579         return true; // no active client -> always allow
00580         }
00581     if( c->ignoreFocusStealing())
00582         return true;
00583     // TODO window urgency  -> return true?
00584     if( Client::belongToSameApplication( c, ac, true ))
00585         {
00586 //        kdDebug( 1212 ) << "Raising: Belongs to active application" << endl;
00587         return true;
00588         }
00589     if( level == 3 ) // high
00590         return false;
00591     Time user_time = ac->userTime();
00592 //    kdDebug( 1212 ) << "Raising, compared:" << time << ":" << user_time
00593 //        << ":" << ( timestampCompare( time, user_time ) >= 0 ) << endl;
00594     return timestampCompare( time, user_time ) >= 0; // time >= user_time
00595     }
00596 
00597 // called from Client after FocusIn that wasn't initiated by KWin and the client
00598 // wasn't allowed to activate
00599 void Workspace::restoreFocus()
00600     {
00601     // this updateXTime() is necessary - as FocusIn events don't have
00602     // a timestamp *sigh*, kwin's timestamp would be older than the timestamp
00603     // that was used by whoever caused the focus change, and therefore
00604     // the attempt to restore the focus would fail due to old timestamp
00605     updateXTime();
00606     if( should_get_focus.count() > 0 )
00607         requestFocus( should_get_focus.last());
00608     else if( last_active_client )
00609         requestFocus( last_active_client );
00610     }
00611 
00612 void Workspace::clientAttentionChanged( Client* c, bool set )
00613     {
00614     if( set )
00615         {
00616         attention_chain.remove( c );
00617         attention_chain.prepend( c );
00618         }
00619     else
00620         attention_chain.remove( c );
00621     }
00622 
00623 // This is used when a client should be shown active immediately after requestFocus(),
00624 // without waiting for the matching FocusIn that will really make the window the active one.
00625 // Used only in special cases, e.g. for MouseActivateRaiseandMove with transparent windows,
00626 bool Workspace::fakeRequestedActivity( Client* c )
00627     {
00628     if( should_get_focus.count() > 0 && should_get_focus.last() == c )
00629         {
00630         if( c->isActive())
00631             return false;
00632         c->setActive( true );
00633         return true;
00634         }
00635     return false;
00636     }
00637 
00638 void Workspace::unfakeActivity( Client* c )
00639     {
00640     if( should_get_focus.count() > 0 && should_get_focus.last() == c )
00641         { // TODO this will cause flicker, and probably is not needed
00642         if( last_active_client != NULL )
00643             last_active_client->setActive( true );
00644         else
00645             c->setActive( false );
00646         }
00647     }
00648 
00649 
00650 //********************************************
00651 // Client
00652 //********************************************
00653 
00660 void Client::updateUserTime( Time time )
00661     { // copied in Group::updateUserTime
00662     if( time == CurrentTime )
00663         time = qt_x_time;
00664     if( time != -1U
00665         && ( user_time == CurrentTime
00666             || timestampCompare( time, user_time ) > 0 )) // time > user_time
00667         user_time = time;
00668     group()->updateUserTime( user_time );
00669     }
00670 
00671 Time Client::readUserCreationTime() const
00672     {
00673     long result = -1; // Time == -1 means none
00674     Atom type;
00675     int format, status;
00676     unsigned long nitems = 0;
00677     unsigned long extra = 0;
00678     unsigned char *data = 0;
00679     KXErrorHandler handler; // ignore errors?
00680     status = XGetWindowProperty( qt_xdisplay(), window(),
00681         atoms->kde_net_wm_user_creation_time, 0, 10000, FALSE, XA_CARDINAL,
00682         &type, &format, &nitems, &extra, &data );
00683     if (status  == Success )
00684         {
00685         if (data && nitems > 0)
00686             result = *((long*) data);
00687         XFree(data);
00688         }
00689     return result;       
00690     }
00691 
00692 void Client::demandAttention( bool set )
00693     {
00694     if( isActive())
00695         set = false;
00696     if( demands_attention == set )
00697         return;
00698     demands_attention = set;
00699     if( demands_attention )
00700         {
00701         // Demand attention flag is often set right from manage(), when focus stealing prevention
00702         // steps in. At that time the window has no taskbar entry yet, so KNotify cannot place
00703         // e.g. the passive popup next to it. So wait up to 1 second for the icon geometry
00704         // to be set.
00705         // Delayed call to KNotify also solves the problem of having X server grab in manage(),
00706         // which may deadlock when KNotify (or KLauncher when launching KNotify) need to access X.
00707         Notify::Event e = isOnCurrentDesktop() ? Notify::DemandAttentionCurrent : Notify::DemandAttentionOther;
00708         // Setting the demands attention state needs to be done directly in KWin, because
00709         // KNotify would try to set it, resulting in a call to KNotify again, etc.
00710         if( Notify::makeDemandAttention( e ))
00711             info->setState( set ? NET::DemandsAttention : 0, NET::DemandsAttention );
00712 
00713         if( demandAttentionKNotifyTimer == NULL )
00714             {
00715             demandAttentionKNotifyTimer = new QTimer( this );
00716             connect( demandAttentionKNotifyTimer, SIGNAL( timeout()), SLOT( demandAttentionKNotify()));
00717             }
00718         demandAttentionKNotifyTimer->start( 1000, true );
00719         }
00720     else
00721         info->setState( set ? NET::DemandsAttention : 0, NET::DemandsAttention );
00722     workspace()->clientAttentionChanged( this, set );
00723     }
00724 
00725 void Client::demandAttentionKNotify()
00726     {
00727     Notify::Event e = isOnCurrentDesktop() ? Notify::DemandAttentionCurrent : Notify::DemandAttentionOther;
00728     Notify::raise( e, i18n( "Window '%1' demands attention." ).arg( KStringHandler::csqueeze(caption())), this );
00729     demandAttentionKNotifyTimer->stop();
00730     demandAttentionKNotifyTimer->deleteLater();
00731     demandAttentionKNotifyTimer = NULL;
00732     }
00733 
00734 // TODO I probably shouldn't be lazy here and do it without the macro, so that people can read it
00735 KWIN_COMPARE_PREDICATE( SameApplicationActiveHackPredicate, const Client*,
00736     // ignore already existing splashes, toolbars, utilities, menus and topmenus,
00737     // as the app may show those before the main window
00738     !cl->isSplash() && !cl->isToolbar() && !cl->isTopMenu() && !cl->isUtility() && !cl->isMenu()
00739     && Client::belongToSameApplication( cl, value, true ) && cl != value);
00740 
00741 Time Client::readUserTimeMapTimestamp( const KStartupInfoId* asn_id, const KStartupInfoData* asn_data,
00742     bool session ) const
00743     {
00744     Time time = info->userTime();
00745 //    kdDebug( 1212 ) << "User timestamp, initial:" << time << endl;
00746     // newer ASN timestamp always replaces user timestamp, unless user timestamp is 0
00747     // helps e.g. with konqy reusing
00748     if( asn_data != NULL && time != 0 )
00749         {
00750         // prefer timestamp from ASN id (timestamp from data is obsolete way)
00751         if( asn_id->timestamp() != 0
00752             && ( time == -1U || timestampCompare( asn_id->timestamp(), time ) > 0 ))
00753             {
00754             time = asn_id->timestamp();
00755             }
00756         else if( asn_data->timestamp() != -1U
00757             && ( time == -1U || timestampCompare( asn_data->timestamp(), time ) > 0 ))
00758             {
00759             time = asn_data->timestamp();
00760             }
00761         }
00762 //    kdDebug( 1212 ) << "User timestamp, ASN:" << time << endl;
00763     if( time == -1U )
00764         { // The window doesn't have any timestamp.
00765       // If it's the first window for its application
00766       // (i.e. there's no other window from the same app),
00767       // use the _KDE_NET_WM_USER_CREATION_TIME trick.
00768       // Otherwise, refuse activation of a window
00769       // from already running application if this application
00770       // is not the active one (unless focus stealing prevention is turned off).
00771         Client* act = workspace()->mostRecentlyActivatedClient();
00772         if( act != NULL && !belongToSameApplication( act, this, true ))
00773             {
00774             bool first_window = true;
00775             if( isTransient())
00776                 {
00777                 if( act->hasTransient( this, true ))
00778                     ; // is transient for currently active window, even though it's not
00779                       // the same app (e.g. kcookiejar dialog) -> allow activation
00780                 else if( groupTransient() &&
00781                     findClientInList( mainClients(), SameApplicationActiveHackPredicate( this )) == NULL )
00782                     ; // standalone transient
00783                 else
00784                     first_window = false;
00785                 }
00786             else
00787                 {
00788                 if( workspace()->findClient( SameApplicationActiveHackPredicate( this )))
00789                     first_window = false;
00790                 }
00791             // don't refuse if focus stealing prevention is turned off
00792             if( !first_window && rules()->checkFSP( options->focusStealingPreventionLevel ) > 0 )
00793                 {
00794 //                kdDebug( 1212 ) << "User timestamp, already exists:" << 0 << endl;
00795                 return 0; // refuse activation
00796                 }
00797             }
00798         // Creation time would just mess things up during session startup,
00799         // as possibly many apps are started up at the same time.
00800         // If there's no active window yet, no timestamp will be needed,
00801         // as plain Workspace::allowClientActivation() will return true
00802         // in such case. And if there's already active window,
00803         // it's better not to activate the new one.
00804         // Unless it was the active window at the time
00805         // of session saving and there was no user interaction yet,
00806         // this check will be done in manage().
00807         if( session )
00808             return -1U;
00809         if( ignoreFocusStealing() && act != NULL )
00810             time = act->userTime();
00811         else
00812             time = readUserCreationTime();
00813         }
00814 //    kdDebug( 1212 ) << "User timestamp, final:" << this << ":" << time << endl;
00815     return time;
00816     }
00817 
00818 Time Client::userTime() const
00819     {
00820     Time time = user_time;
00821     if( time == 0 ) // doesn't want focus after showing
00822         return 0;
00823     assert( group() != NULL );
00824     if( time == -1U
00825          || ( group()->userTime() != -1U
00826                  && timestampCompare( group()->userTime(), time ) > 0 ))
00827         time = group()->userTime();
00828     return time;
00829     }
00830 
00842 void Client::setActive( bool act, bool updateOpacity_)
00843     {
00844     if ( active == act )
00845         return;
00846     active = act;
00847     workspace()->setActiveClient( act ? this : NULL, Allowed );
00848     
00849     if (updateOpacity_) updateOpacity();
00850     if (isModal() && transientFor())
00851     {
00852         if (!act) transientFor()->updateOpacity();
00853         else if (!transientFor()->custom_opacity) transientFor()->setOpacity(options->translucentActiveWindows, options->activeWindowOpacity);
00854     }
00855     updateShadowSize();
00856     
00857     if ( active )
00858         Notify::raise( Notify::Activate );
00859 
00860     if( !active )
00861         cancelAutoRaise();
00862 
00863     if( !active && shade_mode == ShadeActivated )
00864         setShade( ShadeNormal );
00865         
00866     StackingUpdatesBlocker blocker( workspace());
00867     workspace()->updateClientLayer( this ); // active windows may get different layer
00868     // TODO optimize? mainClients() may be a bit expensive
00869     ClientList mainclients = mainClients();
00870     for( ClientList::ConstIterator it = mainclients.begin();
00871          it != mainclients.end();
00872          ++it )
00873         if( (*it)->isFullScreen()) // fullscreens go high even if their transient is active
00874             workspace()->updateClientLayer( *it );
00875     if( decoration != NULL )
00876         decoration->activeChange();
00877     updateMouseGrab();
00878     updateUrgency(); // demand attention again if it's still urgent
00879     }
00880 
00881 void Client::startupIdChanged()
00882     {
00883     KStartupInfoId asn_id;
00884     KStartupInfoData asn_data;
00885     bool asn_valid = workspace()->checkStartupNotification( window(), asn_id, asn_data );
00886     if( !asn_valid )
00887         return;
00888     // If the ASN contains desktop, move it to the desktop, otherwise move it to the current
00889     // desktop (since the new ASN should make the window act like if it's a new application
00890     // launched). However don't affect the window's desktop if it's set to be on all desktops.
00891     int desktop = workspace()->currentDesktop();
00892     if( asn_data.desktop() != 0 )
00893         desktop = asn_data.desktop();
00894     if( !isOnAllDesktops())
00895         workspace()->sendClientToDesktop( this, desktop, true );
00896     if( asn_data.xinerama() != -1 )
00897         workspace()->sendClientToScreen( this, asn_data.xinerama());
00898     Time timestamp = asn_id.timestamp();
00899     if( timestamp == 0 && asn_data.timestamp() != -1U )
00900         timestamp = asn_data.timestamp();
00901     if( timestamp != 0 )
00902         {
00903         bool activate = workspace()->allowClientActivation( this, timestamp );
00904         if( asn_data.desktop() != 0 && !isOnCurrentDesktop())
00905             activate = false; // it was started on different desktop than current one
00906         if( activate )
00907             workspace()->activateClient( this );
00908         else
00909             demandAttention();
00910         }
00911     }
00912 
00913 void Client::updateUrgency()
00914     {
00915     if( urgency )
00916         demandAttention();
00917     }
00918 
00919 void Client::shortcutActivated()
00920     {
00921     workspace()->activateClient( this, true ); // force
00922     }
00923 
00924 //****************************************
00925 // Group
00926 //****************************************
00927     
00928 void Group::startupIdChanged()
00929     {
00930     KStartupInfoId asn_id;
00931     KStartupInfoData asn_data;
00932     bool asn_valid = workspace()->checkStartupNotification( leader_wid, asn_id, asn_data );
00933     if( !asn_valid )
00934         return;
00935     if( asn_id.timestamp() != 0 && user_time != -1U
00936         && timestampCompare( asn_id.timestamp(), user_time ) > 0 )
00937         {
00938         user_time = asn_id.timestamp();
00939         }
00940     else if( asn_data.timestamp() != -1U && user_time != -1U
00941         && timestampCompare( asn_data.timestamp(), user_time ) > 0 )
00942         {
00943         user_time = asn_data.timestamp();
00944         }
00945     }
00946 
00947 void Group::updateUserTime( Time time )
00948     { // copy of Client::updateUserTime
00949     if( time == CurrentTime )
00950         time = qt_x_time;
00951     if( time != -1U
00952         && ( user_time == CurrentTime
00953             || timestampCompare( time, user_time ) > 0 )) // time > user_time
00954         user_time = time;
00955     }
00956 
00957 } // namespace
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