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tdebase/kwin/layers.cpp

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/*****************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 1999, 2000 Matthias Ettrich <ettrich@kde.org>
Copyright (C) 2003 Lubos Lunak <l.lunak@kde.org>
You can Freely distribute this program under the GNU General Public
License. See the file "COPYING" for the exact licensing terms.
******************************************************************/
// SELI zmenit doc
/*
This file contains things relevant to stacking order and layers.
Design:
Normal unconstrained stacking order, as requested by the user (by clicking
on windows to raise them, etc.), is in Workspace::unconstrained_stacking_order.
That list shouldn't be used at all, except for building
Workspace::stacking_order. The building is done
in Workspace::constrainedStackingOrder(). Only Workspace::stackingOrder() should
be used to get the stacking order, because it also checks the stacking order
is up to date.
All clients are also stored in Workspace::clients (except for isDesktop() clients,
as those are very special, and are stored in Workspace::desktops), in the order
the clients were created.
Every window has one layer assigned in which it is. There are 6 layers,
from bottom : DesktopLayer, BelowLayer, NormalLayer, DockLayer, AboveLayer
and ActiveLayer (see also NETWM sect.7.10.). The layer a window is in depends
on the window type, and on other things like whether the window is active.
NET::Splash clients belong to the Normal layer. NET::TopMenu clients
belong to Dock layer. Clients that are both NET::Dock and NET::KeepBelow
are in the Normal layer in order to keep the 'allow window to cover
the panel' Kicker setting to work as intended (this may look like a slight
spec violation, but a) I have no better idea, b) the spec allows adjusting
the stacking order if the WM thinks it's a good idea . We put all
NET::KeepAbove above all Docks too, even though the spec suggests putting
them in the same layer.
Most transients are in the same layer as their mainwindow,
see Workspace::constrainedStackingOrder(), they may also be in higher layers, but
they should never be below their mainwindow.
When some client attribute changes (above/below flag, transiency...),
Workspace::updateClientLayer() should be called in order to make
sure it's moved to the appropriate layer ClientList if needed.
Currently the things that affect client in which layer a client
belongs: KeepAbove/Keep Below flags, window type, fullscreen
state and whether the client is active, mainclient (transiency).
Make sure updateStackingOrder() is called in order to make
Workspace::stackingOrder() up to date and propagated to the world.
Using Workspace::blockStackingUpdates() (or the StackingUpdatesBlocker
helper class) it's possible to temporarily disable updates
and the stacking order will be updated once after it's allowed again.
*/
#include <assert.h>
#include <kdebug.h>
#include "utils.h"
#include "client.h"
#include "workspace.h"
#include "tabbox.h"
#include "group.h"
#include "rules.h"
namespace KWinInternal
{
//*******************************
// Workspace
//*******************************
void Workspace::updateClientLayer( Client* c )
{
if( c == NULL )
return;
if( c->layer() == c->belongsToLayer())
return;
StackingUpdatesBlocker blocker( this );
c->invalidateLayer(); // tqinvalidate, will be updated when doing restacking
for( ClientList::ConstIterator it = c->transients().begin();
it != c->transients().end();
++it )
updateClientLayer( *it );
}
void Workspace::updateStackingOrder( bool propagate_new_clients )
{
if( block_stacking_updates > 0 )
{
blocked_propagating_new_clients = blocked_propagating_new_clients || propagate_new_clients;
return;
}
ClientList new_stacking_order = constrainedStackingOrder();
bool changed = ( new_stacking_order != stacking_order );
stacking_order = new_stacking_order;
#if 0
kdDebug() << "stacking:" << changed << endl;
if( changed || propagate_new_clients )
{
for( ClientList::ConstIterator it = stacking_order.begin();
it != stacking_order.end();
++it )
kdDebug() << (void*)(*it) << *it << ":" << (*it)->layer() << endl;
}
#endif
if( changed || propagate_new_clients )
{
propagateClients( propagate_new_clients );
if( active_client )
active_client->updateMouseGrab();
}
}
/*!
Propagates the managed clients to the world.
Called ONLY from updateStackingOrder().
*/
void Workspace::propagateClients( bool propagate_new_clients )
{
Window *cl; // MW we should not assume WId and Window to be compatible
// when passig pointers around.
// restack the windows according to the stacking order
#if 0
Window* new_stack = new Window[ stacking_order.count() + 2 ];
int pos = 0;
#endif
NET::WindowType t;
Window shadow;
Window *dock_shadow_stack, *window_stack;
int i, numDocks, pos, topmenu_space_pos;
dock_shadow_stack = new Window[ stacking_order.count() * 2 ];
window_stack = new Window[ stacking_order.count() * 2 + 2 ];
i = 0;
pos = 0;
topmenu_space_pos = 1; // not 0, that's supportWindow !!!
// Stack all windows under the support window. The support window is
// not used for anything (besides the NETWM property), and it's not shown,
// but it was lowered after kwin startup. Stacking all clients below
// it ensures that no client will be ever shown above override-redirect
// windows (e.g. popups).
#if 0
new_stack[ pos++ ] = supportWindow->winId();
int topmenu_space_pos = 1; // not 0, that's supportWindow !!!
#endif
window_stack[pos++] = supportWindow->winId();
for( ClientList::ConstIterator it = stacking_order.fromLast();
it != stacking_order.end();
--it )
{
#if 0
new_stack[ pos++ ] = (*it)->frameId();
if( (*it)->belongsToLayer() >= DockLayer )
topmenu_space_pos = pos;
#endif
t = (*it)->windowType();
switch (t)
{
case NET::Dock:
window_stack[pos++] = (*it)->frameId();
if ((shadow = (*it)->shadowId()) != None)
dock_shadow_stack[i++] = shadow;
break;
case NET::Desktop:
numDocks = i;
for (i = 0; i < numDocks; i++)
// Shadows for dock windows go just above the desktop
window_stack[pos++] = dock_shadow_stack[i];
window_stack[pos++] = (*it)->frameId();
break;
case NET::TopMenu:
topmenu_space_pos = pos;
// fall through
default:
window_stack[pos++] = (*it)->frameId();
if ((shadow = (*it)->shadowId()) != None)
// If the current window also has a shadow, place it
// immediately under the current window
window_stack[pos++] = shadow;
}
}
if( topmenu_space != NULL )
{ // make sure the topmenu space is below all topmenus, fullscreens, etc.
for( int i = pos;
i > topmenu_space_pos;
--i )
#if 0
new_stack[ i ] = new_stack[ i - 1 ];
new_stack[ topmenu_space_pos ] = topmenu_space->winId();
#endif
window_stack[ i ] = window_stack[ i - 1 ];
window_stack[ topmenu_space_pos ] = topmenu_space->winId();
++pos;
}
#if 0
// TODO isn't it too inefficient to restart always all clients?
// TODO don't restack not visible windows?
assert( new_stack[ 0 ] = supportWindow->winId());
#endif
#if 0
XRestackWindows(qt_xdisplay(), new_stack, pos);
delete [] new_stack;
#endif
XRestackWindows(qt_xdisplay(), window_stack, pos);
delete [] dock_shadow_stack;
delete [] window_stack;
if ( propagate_new_clients )
{
cl = new Window[ desktops.count() + clients.count()];
pos = 0;
// TODO this is still not completely in the map order
for ( ClientList::ConstIterator it = desktops.begin(); it != desktops.end(); ++it )
cl[pos++] = (*it)->window();
for ( ClientList::ConstIterator it = clients.begin(); it != clients.end(); ++it )
cl[pos++] = (*it)->window();
rootInfo->setClientList( cl, pos );
delete [] cl;
}
cl = new Window[ stacking_order.count()];
pos = 0;
for ( ClientList::ConstIterator it = stacking_order.begin(); it != stacking_order.end(); ++it)
cl[pos++] = (*it)->window();
rootInfo->setClientListStacking( cl, pos );
delete [] cl;
}
/*!
Returns topmost visible client. Windows on the dock, the desktop
or of any other special kind are excluded. Also if the window
doesn't accept focus it's excluded.
*/
// TODO misleading name for this method
Client* Workspace::topClientOnDesktop( int desktop, bool unconstrained, bool only_normal ) const
{
// TODO Q_ASSERT( block_stacking_updates == 0 );
ClientList::ConstIterator begin, end;
if( !unconstrained )
{
begin = stacking_order.fromLast();
end = stacking_order.end();
}
else
{
begin = unconstrained_stacking_order.fromLast();
end = unconstrained_stacking_order.end();
}
for( ClientList::ConstIterator it = begin;
it != end;
--it )
{
if( (*it)->isOnDesktop( desktop ) && (*it)->isShown( false ))
{
if( !only_normal )
return *it;
if( (*it)->wantsTabFocus() && !(*it)->isSpecialWindow())
return *it;
}
}
return 0;
}
Client* Workspace::findDesktop( bool topmost, int desktop ) const
{
// TODO Q_ASSERT( block_stacking_updates == 0 );
if( topmost )
{
for ( ClientList::ConstIterator it = stacking_order.fromLast(); it != stacking_order.end(); --it)
{
if ( (*it)->isOnDesktop( desktop ) && (*it)->isDesktop()
&& (*it)->isShown( true ))
return *it;
}
}
else // bottom-most
{
for ( ClientList::ConstIterator it = stacking_order.begin(); it != stacking_order.end(); ++it)
{
if ( (*it)->isOnDesktop( desktop ) && (*it)->isDesktop()
&& (*it)->isShown( true ))
return *it;
}
}
return NULL;
}
void Workspace::raiseOrLowerClient( Client *c)
{
if (!c) return;
Client* topmost = NULL;
// TODO Q_ASSERT( block_stacking_updates == 0 );
if ( most_recently_raised && stacking_order.tqcontains( most_recently_raised ) &&
most_recently_raised->isShown( true ) && c->isOnCurrentDesktop())
topmost = most_recently_raised;
else
topmost = topClientOnDesktop( c->isOnAllDesktops() ? currentDesktop() : c->desktop());
if( c == topmost)
lowerClient(c);
else
raiseClient(c);
}
void Workspace::lowerClient( Client* c )
{
if ( !c )
return;
if( c->isTopMenu())
return;
c->cancelAutoRaise();
StackingUpdatesBlocker blocker( this );
unconstrained_stacking_order.remove( c );
unconstrained_stacking_order.prepend( c );
if( c->isTransient())
{
// lower also mainclients, in their reversed stacking order
ClientList mainclients = ensureStackingOrder( c->mainClients());
for( ClientList::ConstIterator it = mainclients.fromLast();
it != mainclients.end();
++it )
lowerClient( *it );
}
if ( c == most_recently_raised )
most_recently_raised = 0;
}
void Workspace::lowerClientWithinApplication( Client* c )
{
if ( !c )
return;
if( c->isTopMenu())
return;
c->cancelAutoRaise();
StackingUpdatesBlocker blocker( this );
unconstrained_stacking_order.remove( c );
bool lowered = false;
// first try to put it below the bottom-most window of the application
for( ClientList::Iterator it = unconstrained_stacking_order.begin();
it != unconstrained_stacking_order.end();
++it )
if( Client::belongToSameApplication( *it, c ))
{
unconstrained_stacking_order.insert( it, c );
lowered = true;
break;
}
if( !lowered )
unconstrained_stacking_order.prepend( c );
// ignore mainwindows
}
void Workspace::raiseClient( Client* c )
{
if ( !c )
return;
if( c->isTopMenu())
return;
c->cancelAutoRaise();
StackingUpdatesBlocker blocker( this );
if( c->isTransient())
{
ClientList mainclients = ensureStackingOrder( c->mainClients());
for( ClientList::ConstIterator it = mainclients.begin();
it != mainclients.end();
++it )
raiseClient( *it );
}
unconstrained_stacking_order.remove( c );
unconstrained_stacking_order.append( c );
if (options->shadowEnabled(c->isActive()))
{
c->removeShadow();
c->drawDelayedShadow();
}
if( !c->isSpecialWindow())
{
most_recently_raised = c;
pending_take_activity = NULL;
}
}
void Workspace::raiseClientWithinApplication( Client* c )
{
if ( !c )
return;
if( c->isTopMenu())
return;
c->cancelAutoRaise();
StackingUpdatesBlocker blocker( this );
// ignore mainwindows
// first try to put it above the top-most window of the application
for( ClientList::Iterator it = unconstrained_stacking_order.fromLast();
it != unconstrained_stacking_order.end();
--it )
{
if( *it == c ) // don't lower it just because it asked to be raised
return;
if( Client::belongToSameApplication( *it, c ))
{
unconstrained_stacking_order.remove( c );
++it; // insert after the found one
unconstrained_stacking_order.insert( it, c );
return;
}
}
}
void Workspace::raiseClientRequest( Client* c, NET::RequestSource src, Time timestamp )
{
if( src == NET::FromTool || allowFullClientRaising( c, timestamp ))
raiseClient( c );
else
{
raiseClientWithinApplication( c );
c->demandAttention();
}
}
void Workspace::lowerClientRequest( Client* c, NET::RequestSource src, Time /*timestamp*/ )
{
// If the client has support for all this focus stealing prevention stuff,
// do only lowering within the application, as that's the more logical
// variant of lowering when application requests it.
// No demanding of attention here of course.
if( src == NET::FromTool || !c->hasUserTimeSupport())
lowerClient( c );
else
lowerClientWithinApplication( c );
}
void Workspace::restackClientUnderActive( Client* c )
{
if( c->isTopMenu())
return;
if( !active_client || active_client == c )
{
raiseClient( c );
return;
}
assert( unconstrained_stacking_order.tqcontains( active_client ));
if( Client::belongToSameApplication( active_client, c ))
{ // put it below the active window if it's the same app
unconstrained_stacking_order.remove( c );
unconstrained_stacking_order.insert( unconstrained_stacking_order.tqfind( active_client ), c );
}
else
{ // put in the stacking order below _all_ windows belonging to the active application
for( ClientList::Iterator it = unconstrained_stacking_order.begin();
it != unconstrained_stacking_order.end();
++it )
{ // TODO ignore topmenus?
if( Client::belongToSameApplication( active_client, *it ))
{
if( *it != c )
{
unconstrained_stacking_order.remove( c );
unconstrained_stacking_order.insert( it, c );
}
break;
}
}
}
assert( unconstrained_stacking_order.tqcontains( c ));
for( int desktop = 1;
desktop <= numberOfDesktops();
++desktop )
{ // do for every virtual desktop to handle the case of onalldesktop windows
if( c->wantsTabFocus() && c->isOnDesktop( desktop ) && focus_chain[ desktop ].tqcontains( active_client ))
{
if( Client::belongToSameApplication( active_client, c ))
{ // put it after the active window if it's the same app
focus_chain[ desktop ].remove( c );
focus_chain[ desktop ].insert( focus_chain[ desktop ].tqfind( active_client ), c );
}
else
{ // put it in focus_chain[currentDesktop()] after all windows belonging to the active applicationa
focus_chain[ desktop ].remove( c );
for( ClientList::Iterator it = focus_chain[ desktop ].fromLast();
it != focus_chain[ desktop ].end();
--it )
{
if( Client::belongToSameApplication( active_client, *it ))
{
focus_chain[ desktop ].insert( it, c );
break;
}
}
}
}
}
// the same for global_focus_chain
if( c->wantsTabFocus() && global_focus_chain.tqcontains( active_client ))
{
if( Client::belongToSameApplication( active_client, c ))
{
global_focus_chain.remove( c );
global_focus_chain.insert( global_focus_chain.tqfind( active_client ), c );
}
else
{
global_focus_chain.remove( c );
for( ClientList::Iterator it = global_focus_chain.fromLast();
it != global_focus_chain.end();
--it )
{
if( Client::belongToSameApplication( active_client, *it ))
{
global_focus_chain.insert( it, c );
break;
}
}
}
}
updateStackingOrder();
}
void Workspace::circulateDesktopApplications()
{
if ( desktops.count() > 1 )
{
bool change_active = activeClient()->isDesktop();
raiseClient( findDesktop( false, currentDesktop()));
if( change_active ) // if the previously topmost Desktop was active, activate this new one
activateClient( findDesktop( true, currentDesktop()));
}
// if there's no active client, make desktop the active one
if( desktops.count() > 0 && activeClient() == NULL && should_get_focus.count() == 0 )
activateClient( findDesktop( true, currentDesktop()));
}
/*!
Returns a stacking order based upon \a list that fulfills certain contained.
*/
ClientList Workspace::constrainedStackingOrder()
{
ClientList layer[ NumLayers ];
#if 0
kdDebug() << "stacking1:" << endl;
#endif
// build the order from layers
TQMap< Group*, Layer > minimum_layer;
for( ClientList::ConstIterator it = unconstrained_stacking_order.begin();
it != unconstrained_stacking_order.end();
++it )
{
Layer l = (*it)->layer();
// If a window is raised above some other window in the same window group
// which is in the ActiveLayer (i.e. it's fulscreened), make sure it stays
// above that window (see #95731).
if( minimum_layer.tqcontains( (*it)->group())
&& minimum_layer[ (*it)->group() ] == ActiveLayer
&& ( l == NormalLayer || l == AboveLayer ))
{
l = minimum_layer[ (*it)->group() ];
}
minimum_layer[ (*it)->group() ] = l;
layer[ l ].append( *it );
}
ClientList stacking;
for( Layer lay = FirstLayer;
lay < NumLayers;
++lay )
stacking += layer[ lay ];
#if 0
kdDebug() << "stacking2:" << endl;
for( ClientList::ConstIterator it = stacking.begin();
it != stacking.end();
++it )
kdDebug() << (void*)(*it) << *it << ":" << (*it)->layer() << endl;
#endif
// now keep transients above their mainwindows
// TODO this could(?) use some optimization
for( ClientList::Iterator it = stacking.fromLast();
it != stacking.end();
)
{
if( !(*it)->isTransient())
{
--it;
continue;
}
ClientList::Iterator it2 = stacking.end();
if( (*it)->groupTransient())
{
if( (*it)->group()->members().count() > 0 )
{ // find topmost client this one is transient for
for( it2 = stacking.fromLast();
it2 != stacking.end();
--it2 )
{
if( *it2 == *it )
{
it2 = stacking.end(); // don't reorder
break;
}
if( (*it2)->hasTransient( *it, true ) && keepTransientAbove( *it2, *it ))
break;
}
} // else it2 remains pointing at stacking.end()
}
else
{
for( it2 = stacking.fromLast();
it2 != stacking.end();
--it2 )
{
if( *it2 == *it )
{
it2 = stacking.end(); // don't reorder
break;
}
if( *it2 == (*it)->transientFor() && keepTransientAbove( *it2, *it ))
break;
}
}
// kdDebug() << "STACK:" << (*it) << ":" << ( it2 == stacking.end() ? ((Client*)0) : (*it2)) << endl;
if( it2 == stacking.end())
{
--it;
continue;
}
Client* current = *it;
ClientList::Iterator remove_it = it;
--it;
stacking.remove( remove_it );
if( !current->transients().isEmpty()) // this one now can be possibly above its transients,
it = it2; // so go again higher in the stack order and possibly move those transients again
++it2; // insert after the mainwindow, it's ok if it2 is now stacking.end()
stacking.insert( it2, current );
}
#if 0
kdDebug() << "stacking3:" << endl;
for( ClientList::ConstIterator it = stacking.begin();
it != stacking.end();
++it )
kdDebug() << (void*)(*it) << *it << ":" << (*it)->layer() << endl;
kdDebug() << "\n\n" << endl;
#endif
return stacking;
}
void Workspace::blockStackingUpdates( bool block )
{
if( block )
{
if( block_stacking_updates == 0 )
blocked_propagating_new_clients = false;
++block_stacking_updates;
}
else // !block
if( --block_stacking_updates == 0 )
updateStackingOrder( blocked_propagating_new_clients );
}
// Ensure list is in stacking order
ClientList Workspace::ensureStackingOrder( const ClientList& list ) const
{
// TODO Q_ASSERT( block_stacking_updates == 0 );
if( list.count() < 2 )
return list;
// TODO is this worth optimizing?
ClientList result = list;
for( ClientList::ConstIterator it = stacking_order.begin();
it != stacking_order.end();
++it )
if( result.remove( *it ) != 0 )
result.append( *it );
return result;
}
// check whether a transient should be actually kept above its mainwindow
// there may be some special cases where this rule shouldn't be enfored
bool Workspace::keepTransientAbove( const Client* mainwindow, const Client* transient )
{
// When topmenu's mainwindow becomes active, topmenu is raised and shown.
// They also belong to the Dock layer. This makes them to be very high.
// Therefore don't keep group transients above them, otherwise this would move
// group transients way too high.
if( mainwindow->isTopMenu() && transient->groupTransient())
return false;
// #93832 - don't keep splashscreens above dialogs
if( transient->isSplash() && mainwindow->isDialog())
return false;
// This is rather a hack for #76026. Don't keep non-modal dialogs above
// the mainwindow, but only if they're group transient (since only such dialogs
// have taskbar entry in Kicker). A proper way of doing this (both kwin and kicker)
// needs to be found.
if( transient->isDialog() && !transient->isModal() && transient->groupTransient())
return false;
// #63223 - don't keep transients above docks, because the dock is kept high,
// and e.g. dialogs for them would be too high too
if( mainwindow->isDock())
return false;
return true;
}
//*******************************
// Client
//*******************************
void Client::restackWindow( Window /*above TODO */, int detail, NET::RequestSource src, Time timestamp, bool send_event )
{
switch ( detail )
{
case Above:
case TopIf:
workspace()->raiseClientRequest( this, src, timestamp );
break;
case Below:
case BottomIf:
workspace()->lowerClientRequest( this, src, timestamp );
break;
case Opposite:
default:
break;
}
if( send_event )
sendSyntheticConfigureNotify();
}
void Client::setKeepAbove( bool b )
{
b = rules()->checkKeepAbove( b );
if( b && !rules()->checkKeepBelow( false ))
setKeepBelow( false );
if ( b == keepAbove())
{ // force hint change if different
if( bool( info->state() & NET::KeepAbove ) != keepAbove())
info->setState( keepAbove() ? NET::KeepAbove : 0, NET::KeepAbove );
return;
}
keep_above = b;
info->setState( keepAbove() ? NET::KeepAbove : 0, NET::KeepAbove );
if( decoration != NULL )
decoration->emitKeepAboveChanged( keepAbove());
workspace()->updateClientLayer( this );
updateWindowRules();
}
void Client::setKeepBelow( bool b )
{
b = rules()->checkKeepBelow( b );
if( b && !rules()->checkKeepAbove( false ))
setKeepAbove( false );
if ( b == keepBelow())
{ // force hint change if different
if( bool( info->state() & NET::KeepBelow ) != keepBelow())
info->setState( keepBelow() ? NET::KeepBelow : 0, NET::KeepBelow );
return;
}
keep_below = b;
info->setState( keepBelow() ? NET::KeepBelow : 0, NET::KeepBelow );
if( decoration != NULL )
decoration->emitKeepBelowChanged( keepBelow());
workspace()->updateClientLayer( this );
updateWindowRules();
}
Layer Client::layer() const
{
if( in_layer == UnknownLayer )
const_cast< Client* >( this )->in_layer = belongsToLayer();
return in_layer;
}
Layer Client::belongsToLayer() const
{
if( isDesktop())
return DesktopLayer;
if( isSplash()) // no damn annoying splashscreens
return NormalLayer; // getting in the way of everything else
if( isDock() && keepBelow())
// slight hack for the 'allow window to cover panel' Kicker setting
// don't move keepbelow docks below normal window, but only to the same
// layer, so that both may be raised to cover the other
return NormalLayer;
if( keepBelow())
return BelowLayer;
if( isDock() && !keepBelow())
return DockLayer;
if( isTopMenu())
return DockLayer;
// only raise fullscreen above docks if it's the topmost window in unconstrained stacking order,
// i.e. the window set to be topmost by the user (also includes transients of the fullscreen window)
const Client* ac = workspace()->mostRecentlyActivatedClient(); // instead of activeClient() - avoids flicker
const Client* top = workspace()->topClientOnDesktop( desktop(), true, false );
if( isFullScreen() && ac != NULL && top != NULL
&& ( ac == this || this->group() == ac->group())
&& ( top == this || this->group() == top->group()))
return ActiveLayer;
if( keepAbove())
return AboveLayer;
return NormalLayer;
}
} // namespace
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