KWindowSystem

#include <kwindowsystem.h>

Inheritance diagram for KWindowSystem:

Public Types
enum	IconSource { NETWM = 1, WMHints = 2, ClassHint = 4, XApp = 8 }

enum	Platform { Platform::Unknown, Platform::X11, Platform::Wayland }

Public Types inherited from NET
enum	{ OnAllDesktops = -1 }

enum	Action { ActionMove = 1u << 0, ActionResize = 1u << 1, ActionMinimize = 1u << 2, ActionShade = 1u << 3, ActionStick = 1u << 4, ActionMaxVert = 1u << 5, ActionMaxHoriz = 1u << 6, ActionMax = ActionMaxVert \| ActionMaxHoriz, ActionFullScreen = 1u << 7, ActionChangeDesktop = 1u << 8, ActionClose = 1u << 9 }

typedef QFlags< Action >	Actions

enum	DesktopLayoutCorner { DesktopLayoutCornerTopLeft = 0, DesktopLayoutCornerTopRight = 1, DesktopLayoutCornerBottomLeft = 2, DesktopLayoutCornerBottomRight = 3 }

enum	Direction { TopLeft = 0, Top = 1, TopRight = 2, Right = 3, BottomRight = 4, Bottom = 5, BottomLeft = 6, Left = 7, Move = 8, KeyboardSize = 9, KeyboardMove = 10, MoveResizeCancel = 11 }

enum	MappingState { Visible = 1, Withdrawn = 0, Iconic = 3 }

enum	Orientation { OrientationHorizontal = 0, OrientationVertical = 1 }

typedef QFlags< Property >	Properties

typedef QFlags< Property2 >	Properties2

enum	Property { Supported = 1u << 0, ClientList = 1u << 1, ClientListStacking = 1u << 2, NumberOfDesktops = 1u << 3, DesktopGeometry = 1u << 4, DesktopViewport = 1u << 5, CurrentDesktop = 1u << 6, DesktopNames = 1u << 7, ActiveWindow = 1u << 8, WorkArea = 1u << 9, SupportingWMCheck = 1u << 10, VirtualRoots = 1u << 11, CloseWindow = 1u << 13, WMMoveResize = 1u << 14, WMName = 1u << 15, WMVisibleName = 1u << 16, WMDesktop = 1u << 17, WMWindowType = 1u << 18, WMState = 1u << 19, WMStrut = 1u << 20, WMIconGeometry = 1u << 21, WMIcon = 1u << 22, WMPid = 1u << 23, WMHandledIcons = 1u << 24, WMPing = 1u << 25, XAWMState = 1u << 27, WMFrameExtents = 1u << 28, WMIconName = 1u << 29, WMVisibleIconName = 1u << 30, WMGeometry = 1u << 31, WMAllProperties = ~0u }

enum	Property2 { WM2UserTime = 1u << 0, WM2StartupId = 1u << 1, WM2TransientFor = 1u << 2, WM2GroupLeader = 1u << 3, WM2AllowedActions = 1u << 4, WM2RestackWindow = 1u << 5, WM2MoveResizeWindow = 1u << 6, WM2ExtendedStrut = 1u << 7, WM2KDETemporaryRules = 1u << 8, WM2WindowClass = 1u << 9, WM2WindowRole = 1u << 10, WM2ClientMachine = 1u << 11, WM2ShowingDesktop = 1u << 12, WM2Opacity = 1u << 13, WM2DesktopLayout = 1u << 14, WM2FullPlacement = 1u << 15, WM2FullscreenMonitors = 1u << 16, WM2FrameOverlap = 1u << 17, WM2Activities = 1u << 18, WM2BlockCompositing = 1u << 19, WM2KDEShadow = 1u << 20, WM2Urgency = 1u << 21, WM2Input = 1u << 22, WM2Protocols = 1u << 23, WM2InitialMappingState = 1u << 24, WM2IconPixmap = 1u << 25, WM2OpaqueRegion = 1u << 25, WM2DesktopFileName = 1u << 26, WM2GTKFrameExtents = 1u << 27, WM2AppMenuServiceName = 1u << 28, WM2AppMenuObjectPath = 1u << 29, WM2GTKApplicationId = 1u << 30, WM2GTKShowWindowMenu = 1u << 31, WM2AllProperties = ~0u }

enum	Protocol { NoProtocol = 0, TakeFocusProtocol = 1 << 0, DeleteWindowProtocol = 1 << 1, PingProtocol = 1 << 2, SyncRequestProtocol = 1 << 3, ContextHelpProtocol = 1 << 4 }

typedef QFlags< Protocol >	Protocols

enum	RequestSource { FromUnknown = 0, FromApplication = 1, FromTool = 2 }

enum	Role { Client, WindowManager }

enum	State { Modal = 1u << 0, Sticky = 1u << 1, MaxVert = 1u << 2, MaxHoriz = 1u << 3, Max = MaxVert \| MaxHoriz, Shaded = 1u << 4, SkipTaskbar = 1u << 5, KeepAbove = 1u << 6, StaysOnTop = KeepAbove, SkipPager = 1u << 7, Hidden = 1u << 8, FullScreen = 1u << 9, KeepBelow = 1u << 10, DemandsAttention = 1u << 11, SkipSwitcher = 1u << 12, Focused = 1u << 13 }

typedef QFlags< State >	States

enum	WindowType { Unknown = -1, Normal = 0, Desktop = 1, Dock = 2, Toolbar = 3, Menu = 4, Dialog = 5, Override = 6, TopMenu = 7, Utility = 8, Splash = 9, DropdownMenu = 10, PopupMenu = 11, Tooltip = 12, Notification = 13, ComboBox = 14, DNDIcon = 15, OnScreenDisplay = 16, CriticalNotification = 17, AppletPopup = 18 }

enum	WindowTypeMask { NormalMask = 1u << 0, DesktopMask = 1u << 1, DockMask = 1u << 2, ToolbarMask = 1u << 3, MenuMask = 1u << 4, DialogMask = 1u << 5, OverrideMask = 1u << 6, TopMenuMask = 1u << 7, UtilityMask = 1u << 8, SplashMask = 1u << 9, DropdownMenuMask = 1u << 10, PopupMenuMask = 1u << 11, TooltipMask = 1u << 12, NotificationMask = 1u << 13, ComboBoxMask = 1u << 14, DNDIconMask = 1u << 15, OnScreenDisplayMask = 1u << 16, CriticalNotificationMask = 1u << 17, AppletPopupMask = 1u << 18, AllTypesMask = 0U - 1 }

typedef QFlags< WindowTypeMask >	WindowTypes

Properties
bool	isPlatformWayland

bool	isPlatformX11

Properties inherited from QObject
	objectName

Signals
void	activeWindowChanged (WId id)

void	compositingChanged (bool enabled)

void	currentDesktopChanged (int desktop)

void	desktopNamesChanged ()

void	numberOfDesktopsChanged (int num)

void	showingDesktopChanged (bool showing)

void	stackingOrderChanged ()

void	strutChanged ()

void	windowAdded (WId id)

void	windowChanged (WId id)

QT_MOC_COMPAT void	windowChanged (WId id, const unsigned long *properties)

void	windowChanged (WId id, NET::Properties properties, NET::Properties2 properties2)

QT_MOC_COMPAT void	windowChanged (WId id, unsigned int properties)

void	windowRemoved (WId id)

void	workAreaChanged ()

void	xdgActivationTokenArrived (int serial, const QString &token)

Static Public Member Functions
static Q_INVOKABLE void	activateWindow (QWindow *window, long time=0)

static void	activateWindow (WId win, long time=0)

static WId	activeWindow ()

static bool	allowedActionsSupported ()

static void	allowExternalProcessWindowActivation (int pid=-1)

static void	clearState (WId win, NET::States state)

static bool	compositingActive ()

static QPoint	constrainViewportRelativePosition (const QPoint &pos)

static int	currentDesktop ()

static void	demandAttention (WId win, bool set=true)

static QString	desktopName (int desktop)

static QPoint	desktopToViewport (int desktop, bool absolute)

static void	forceActiveWindow (WId win, long time=0)

static WId	groupLeader (WId window)

static bool	hasWId (WId id)

static bool	icccmCompliantMappingState ()

static QPixmap	icon (WId win, int width, int height, bool scale, int flags)

static QPixmap	icon (WId win, int width, int height, bool scale, int flags, NETWinInfo *info)

static QPixmap	icon (WId win, int width=-1, int height=-1, bool scale=false)

static bool	isPlatformWayland ()

static bool	isPlatformX11 ()

static Q_INVOKABLE quint32	lastInputSerial (QWindow *window)

static void	lowerWindow (WId win)

static bool	mapViewport ()

static void	minimizeWindow (WId win)

static void	minimizeWindow (WId win, bool animation)

static int	numberOfDesktops ()

static Platform	platform ()

static void	raiseWindow (WId win)

static QString	readNameProperty (WId window, unsigned long atom)

static Q_INVOKABLE void	requestXdgActivationToken (QWindow *win, uint32_t serial, const QString &app_id)

static KWindowSystem *	self ()

static void	setBlockingCompositing (WId window, bool active)

static void	setCurrentDesktop (int desktop)

static Q_INVOKABLE void	setCurrentXdgActivationToken (const QString &token)

static void	setDesktopName (int desktop, const QString &name)

static void	setExtendedStrut (WId win, int left_width, int left_start, int left_end, int right_width, int right_start, int right_end, int top_width, int top_start, int top_end, int bottom_width, int bottom_start, int bottom_end)

static void	setIcons (WId win, const QPixmap &icon, const QPixmap &miniIcon)

static void	setMainWindow (QWidget *subwindow, WId mainwindow)

static void	setMainWindow (QWindow *subwindow, WId mainwindow)

static void	setOnActivities (WId win, const QStringList &activities)

static void	setOnAllDesktops (WId win, bool b)

static void	setOnDesktop (WId win, int desktop)

static void	setShowingDesktop (bool showing)

static void	setState (WId win, NET::States state)

static void	setStrut (WId win, int left, int right, int top, int bottom)

static void	setType (WId win, NET::WindowType windowType)

static void	setUserTime (WId win, long time)

static bool	showingDesktop ()

static QList< WId >	stackingOrder ()

static WId	transientFor (WId window)

static void	unminimizeWindow (WId win)

static void	unminimizeWindow (WId win, bool animation)

static void	updateStartupId (QWindow *window)

static int	viewportToDesktop (const QPoint &pos)

static int	viewportWindowToDesktop (const QRect &r)

static KWindowInfo	windowInfo (WId win, NET::Properties properties, NET::Properties2 properties2=NET::Properties2())

static QList< WId >	windows ()

static QRect	workArea (const QList< WId > &excludes, int desktop=-1)

static QRect	workArea (int desktop=-1)

Static Public Member Functions inherited from QObject
QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, PointerToMemberFunction signal, const QObject context, Functor functor, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject sender, PointerToMemberFunction signal, const QObject receiver, PointerToMemberFunction method, Qt::ConnectionType type)

QMetaObject::Connection	connect (const QObject *sender, PointerToMemberFunction signal, Functor functor)

bool	disconnect (const QMetaObject::Connection &connection)

bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char method)

bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method)

bool	disconnect (const QObject sender, PointerToMemberFunction signal, const QObject receiver, PointerToMemberFunction method)

QString	tr (const char sourceText, const char disambiguation, int n)

QString	trUtf8 (const char sourceText, const char disambiguation, int n)

Static Public Member Functions inherited from NET
static int	timestampCompare (unsigned long time1, unsigned long time2)

static int	timestampDiff (unsigned long time1, unsigned long time2)

static bool	typeMatchesMask (WindowType type, WindowTypes mask)

Protected Member Functions
void	connectNotify (const QMetaMethod &signal) override

Protected Member Functions inherited from QObject
virtual void	childEvent (QChildEvent *event)

virtual void	customEvent (QEvent *event)

virtual void	disconnectNotify (const QMetaMethod &signal)

bool	isSignalConnected (const QMetaMethod &signal) const const

int	receivers (const char *signal) const const

QObject *	sender () const const

int	senderSignalIndex () const const

virtual void	timerEvent (QTimerEvent *event)

Additional Inherited Members
Public Member Functions inherited from QObject
	QObject (QObject *parent)

bool	blockSignals (bool block)

const QObjectList &	children () const const

QMetaObject::Connection	connect (const QObject sender, const char signal, const char *method, Qt::ConnectionType type) const const

void	deleteLater ()

void	destroyed (QObject *obj)

bool	disconnect (const char signal, const QObject receiver, const char *method) const const

bool	disconnect (const QObject receiver, const char method) const const

void	dumpObjectInfo ()

void	dumpObjectInfo () const const

void	dumpObjectTree ()

void	dumpObjectTree () const const

QList< QByteArray >	dynamicPropertyNames () const const

virtual bool	event (QEvent *e)

virtual bool	eventFilter (QObject watched, QEvent event)

T	findChild (const QString &name, Qt::FindChildOptions options) const const

QList< T >	findChildren (const QRegExp &regExp, Qt::FindChildOptions options) const const

QList< T >	findChildren (const QRegularExpression &re, Qt::FindChildOptions options) const const

QList< T >	findChildren (const QString &name, Qt::FindChildOptions options) const const

bool	inherits (const char *className) const const

void	installEventFilter (QObject *filterObj)

bool	isWidgetType () const const

bool	isWindowType () const const

void	killTimer (int id)

virtual const QMetaObject *	metaObject () const const

void	moveToThread (QThread *targetThread)

QString	objectName () const const

void	objectNameChanged (const QString &objectName)

QObject *	parent () const const

QVariant	property (const char *name) const const

	Q_CLASSINFO (Name, Value)

	Q_DISABLE_COPY (Class)

	Q_DISABLE_COPY_MOVE (Class)

	Q_DISABLE_MOVE (Class)

	Q_EMIT Q_EMIT

	Q_ENUM (...)

	Q_ENUM_NS (...)

	Q_ENUMS (...)

	Q_FLAG (...)

	Q_FLAG_NS (...)

	Q_FLAGS (...)

	Q_GADGET Q_GADGET

	Q_INTERFACES (...)

	Q_INVOKABLE Q_INVOKABLE

	Q_NAMESPACE Q_NAMESPACE

	Q_NAMESPACE_EXPORT (EXPORT_MACRO)

	Q_OBJECT Q_OBJECT

	Q_PROPERTY (...)

	Q_REVISION Q_REVISION

	Q_SET_OBJECT_NAME (Object)

	Q_SIGNAL Q_SIGNAL

	Q_SIGNALS Q_SIGNALS

	Q_SLOT Q_SLOT

	Q_SLOTS Q_SLOTS

T	qFindChild (const QObject *obj, const QString &name)

QList< T >	qFindChildren (const QObject *obj, const QRegExp &regExp)

QList< T >	qFindChildren (const QObject *obj, const QString &name)

T	qobject_cast (const QObject *object)

T	qobject_cast (QObject *object)

	QT_NO_NARROWING_CONVERSIONS_IN_CONNECT QT_NO_NARROWING_CONVERSIONS_IN_CONNECT

void	removeEventFilter (QObject *obj)

void	setObjectName (const QString &name)

void	setParent (QObject *parent)

bool	setProperty (const char *name, const QVariant &value)

bool	signalsBlocked () const const

int	startTimer (int interval, Qt::TimerType timerType)

int	startTimer (std::chrono::milliseconds time, Qt::TimerType timerType)

QThread *	thread () const const

Public Attributes inherited from QObject
typedef	QObjectList

Detailed Description

Convenience access to certain properties and features of the window manager.

The class KWindowSystem provides information about the state of the window manager and allows asking the window manager to change them using a more high-level interface than the NETWinInfo/NETRootInfo lowlevel classes.

Because of limitations of the way Qt is implemented on Mac OSX, the WId's returned by methods in this class are not compatible with those expected by other Qt methods. So while it should be fine to pass WId's retrieved by for example calling the winId method on a QWidget to methods in this class the reverse is not true. You should never pass a WId obtained from this class to a Qt method accepting a WId parameter.

Class for interaction with the window manager.

Author: Matthias Ettrich (ettri.nosp@m.ch@k.nosp@m.de.or.nosp@m.g)

Definition at line 44 of file kwindowsystem.h.

Member Enumeration Documentation

◆ IconSource

enum KWindowSystem::IconSource

Masks specifying from which sources to read an icon.

They are tried from the best until an icon is found.

NETWM from property from the window manager specification
WMHints from WMHints property
ClassHint load icon after getting name from the classhint
XApp load the standard X icon (last fallback)

Enumerator
NETWM	read from property from the window manager specification
WMHints	read from WMHints property
ClassHint	load icon after getting name from the classhint
XApp	load the standard X icon (last fallback)

Definition at line 389 of file kwindowsystem.h.

◆ Platform

enum KWindowSystem::Platform

strong

Enum describing the windowing system platform used by the QGuiApplication.

See also: platform

Since: 5.25

Enumerator
Unknown	A platform unknown to the application is used.
X11	The xcb/X11 windowing system platorm.
Wayland	The Wayland windowing system platform.

Definition at line 811 of file kwindowsystem.h.

Member Function Documentation

◆ activateWindow() [1/2]

void KWindowSystem::activateWindow	(	QWindow *	window,
		long	time = `0`
	)

static

Requests that window win is activated.

There are two ways how to activate a window, by calling activateWindow() and forceActiveWindow(). Generally, applications shouldn't make attempts to explicitly activate their windows, and instead let the user to activate them. In the special cases where this may be needed, applications should use activateWindow(). Window manager may consider whether this request wouldn't result in focus stealing, which would be obtrusive, and may refuse the request.

The usage of forceActiveWindow() is meant only for pagers and similar tools, which represent direct user actions related to window manipulation. Except for rare cases, this request will be always honored, and normal applications are forbidden to use it.

In case of problems, consult the KWin README in the kdebase package (kdebase/kwin/README), or ask on the kwin@.nosp@m.kde..nosp@m.org mailing list.

Parameters

window	the window to make active
time	X server timestamp of the user activity that caused this request

Since: 5.89

Definition at line 478 of file kwindowsystem.cpp.

◆ activateWindow() [2/2]

void KWindowSystem::activateWindow	(	WId	win,
		long	time = `0`
	)

static

Requests that window win is activated.

In case of problems, consult the KWin README in the kdebase package (kdebase/kwin/README), or ask on the kwin@.nosp@m.kde..nosp@m.org mailing list.

Parameters

win	the id of the window to make active
time	X server timestamp of the user activity that caused this request

Deprecated:: since 5.101, use KX11Extras::activateWindow() or KWindowSystem::activateWindow(QWindow *) instead

Definition at line 471 of file kwindowsystem.cpp.

◆ activeWindow()

WId KWindowSystem::activeWindow ( )

static

Returns the currently active window, or 0 if no window is active.

Returns: the window id of the active window, or 0 if no window is active

Deprecated:: since 5.101, use KX11Extras::activeWindow()

Definition at line 463 of file kwindowsystem.cpp.

◆ activeWindowChanged

void KWindowSystem::activeWindowChanged ( WId id )

signal

Hint that <Window> is active (= has focus) now.

Parameters

id	the id of the window that is active

Deprecated:: since 5.101, use KX11Extras::activeWindowChanged()

◆ allowedActionsSupported()

bool KWindowSystem::allowedActionsSupported ( )

static

Returns true if the WM announces which actions it allows for windows.

Definition at line 759 of file kwindowsystem.cpp.

◆ allowExternalProcessWindowActivation()

void KWindowSystem::allowExternalProcessWindowActivation ( int pid = -1 )

static

Allows a window from another process to raise and activate itself.

Depending on the window manager, the grant may only be temporary, or for a single activation, and it may require the current process to be the "foreground" one" (ie. the process with the input focus).

You should call this function before executing actions that may trigger the showing of a window or dialog in another process, e.g. a dbus signal or function call, or any other inter-process notification mechanism.

This is mostly used on Windows, where windows are not allowed to be raised and activated if their process is not the foreground one, but it may also apply to other window managers.

Parameters

pid	if specified, the grant only applies to windows belonging to the specific process. By default, a value of -1 means all processes.

Deprecated:: since 5.104, not implemented.

Definition at line 774 of file kwindowsystem.cpp.

◆ clearState()

void KWindowSystem::clearState	(	WId	win,
		NET::States	state
	)

static

Clears the state of window win from state.

Possible values are or'ed combinations of NET::Modal, NET::Sticky, NET::MaxVert, NET::MaxHoriz, NET::Shaded, NET::SkipTaskbar, NET::SkipPager, NET::Hidden, NET::FullScreen, NET::KeepAbove, NET::KeepBelow, NET::SkipSwitcher

Parameters

win	the id of the window
state	the flags that will be cleared

Definition at line 597 of file kwindowsystem.cpp.

◆ compositingActive()

bool KWindowSystem::compositingActive ( )

static

Returns true if a compositing manager is running (i.e.

ARGB windows are supported, effects will be provided, etc.).

Deprecated:: since 5.101, use KX11Extras::compositingActive()

Definition at line 650 of file kwindowsystem.cpp.

◆ compositingChanged

void KWindowSystem::compositingChanged ( bool enabled )

signal

Compositing was enabled or disabled.

Note that this signal may be emitted before any compositing plugins have been initialized in the window manager.

If you need to check if a specific compositing plugin such as the blur effect is enabled, you should track that separately rather than test for it in a slot connected to this signal.

Since: 4.7.1

Deprecated:: since 5.101, use KX11Extras::compositingChanged()

◆ constrainViewportRelativePosition()

QPoint KWindowSystem::constrainViewportRelativePosition ( const QPoint & pos )

static

Since: 4.0.1 Checks the relative difference used to move a window will still be inside valid desktop area.

Definition at line 816 of file kwindowsystem.cpp.

◆ currentDesktop()

int KWindowSystem::currentDesktop ( )

static

Returns the current virtual desktop.

Returns: the current virtual desktop

Deprecated:: since 5.101, use KX11Extras::currentDesktop()

Definition at line 415 of file kwindowsystem.cpp.

◆ currentDesktopChanged

void KWindowSystem::currentDesktopChanged ( int desktop )

signal

Switched to another virtual desktop.

Parameters

desktop the number of the new desktop

Deprecated:: since 5.101, use KX11Extras::currentDesktopChanged()

◆ demandAttention()

void KWindowSystem::demandAttention	(	WId	win,
		bool	set = `true`
	)

static

When application finishes some operation and wants to notify the user about it, it can call demandAttention().

Instead of activating the window, which could be obtrusive, the window will be marked specially as demanding user's attention. See also explanation in description of activateWindow().

Note that it's usually better to use KNotifyClient.

Deprecated:: since 5.101, use QWindow::alert() instead().

Definition at line 493 of file kwindowsystem.cpp.

◆ desktopName()

QString KWindowSystem::desktopName ( int desktop )

static

Returns the name of the specified desktop.

Parameters

desktop the number of the desktop

Returns: the name of the desktop

Deprecated:: since 5.101, use KX11Extras::desktopName()

Definition at line 674 of file kwindowsystem.cpp.

◆ desktopNamesChanged

void KWindowSystem::desktopNamesChanged ( )

signal

Desktops have been renamed.

Deprecated:: since 5.101, use KX11Extras::desktopNamesChanged()

◆ desktopToViewport()

QPoint KWindowSystem::desktopToViewport	(	int	desktop,
		bool	absolute
	)

static

Returns topleft corner of the viewport area for the given mapped virtual desktop.

Definition at line 809 of file kwindowsystem.cpp.

◆ forceActiveWindow()

void KWindowSystem::forceActiveWindow	(	WId	win,
		long	time = `0`
	)

static

Sets window win to be the active window.

Note that this should be called only in special cases, applications shouldn't force themselves or other windows to be the active window. Generally, this call should used only by pagers and similar tools. See the explanation in description of activateWindow().

Parameters

win	the id of the window to make active
time	X server timestamp of the user activity that caused this request

Deprecated:: since 5.101, use KX11Extras::forceActiveWindow()

Definition at line 485 of file kwindowsystem.cpp.

◆ groupLeader()

WId KWindowSystem::groupLeader ( WId window )

static

Returns the leader window for the group the given window is in, if any.

Parameters

window the id of the window

Deprecated:: Since 5.0, use KWindowInfo::groupLeader

Definition at line 530 of file kwindowsystem.cpp.

◆ hasWId()

bool KWindowSystem::hasWId ( WId id )

static

Test to see if id still managed at present.

Parameters

id	the window id to test

Returns: true if the window id is still managed

Deprecated:: since 5.101, use KX11Extras::hasWId()

Definition at line 400 of file kwindowsystem.cpp.

◆ icccmCompliantMappingState()

bool KWindowSystem::icccmCompliantMappingState ( )

static

Returns true if the WM uses IconicState also for windows on inactive virtual desktops.

Deprecated:: since 5.101, internal.

Definition at line 752 of file kwindowsystem.cpp.

◆ icon() [1/3]

QPixmap KWindowSystem::icon	(	WId	win,
		int	width,
		int	height,
		bool	scale,
		int	flags
	)

static

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Overloaded variant that allows specifying from which sources the icon should be read.

You should usually prefer the simpler variant which tries all possibilities to get an icon.

Parameters

win	the id of the window
width	the desired width, or -1
height	the desired height, or -1
scale	if true the icon will be scaled to the desired size. Otherwise the icon will not be modified.
flags	OR-ed flags from the IconSource enum

Deprecated:: since 5.101, use KX11Extras::icon()

Definition at line 545 of file kwindowsystem.cpp.

◆ icon() [2/3]

QPixmap KWindowSystem::icon	(	WId	win,
		int	width,
		int	height,
		bool	scale,
		int	flags,
		NETWinInfo *	info
	)

static

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Overloaded variant that allows passing in the NETWinInfo to use for reading the information.

This variant is only useful on the X11 platform, other platforms do not use NETWinInfo and delegate to the variant without NETWinInfo. Though if compiled with X11 support the X11 variant is used on other platforms if info is not nullptr. This can be used by applications using e.g. platform wayland but also connecting to an XServer.

The NETWinInfo must be constructed with property NET::WMIcon in order to use the IconSource flag NETWM. NET::WM2IconPixmap for IconSource flag WMHints and NET::WM2WindowClass for IconSource flag ClassHint.

Parameters

win	the id of the window
width	the desired width, or -1
height	the desired height, or -1
scale	if true the icon will be scaled to the desired size. Otherwise the icon will not be modified.
flags	OR-ed flags from the IconSource enum
into	the NETWinInfo to use for reading properties.

Since: 5.7

Deprecated:: since 5.101, use KX11Extras::icon()

Definition at line 553 of file kwindowsystem.cpp.

◆ icon() [3/3]

QPixmap KWindowSystem::icon	(	WId	win,
		int	width = `-1`,
		int	height = `-1`,
		bool	scale = `false`
	)

static

Returns an icon for window win.

If width and height are specified, the best icon for the requested size is returned.

If scale is true, the icon is smooth-scaled to have exactly the requested size.

Parameters

win	the id of the window
width	the desired width, or -1
height	the desired height, or -1
scale	if true the icon will be scaled to the desired size. Otherwise the icon will not be modified.

Returns: the icon of the window

Deprecated:: since 5.101, use KX11Extras::icon()

Definition at line 538 of file kwindowsystem.cpp.

◆ isPlatformWayland()

static bool KWindowSystem::isPlatformWayland ( )

static

Convenience method to check whether the Platform is Wayland.

See also: platform; isPlatformX11

Since: 5.25

◆ isPlatformX11()

static bool KWindowSystem::isPlatformX11 ( )

static

Convenience method to check whether the Platform is X11.

See also: platform; isPlatformWayland

Since: 5.25

◆ lastInputSerial()

quint32 KWindowSystem::lastInputSerial ( QWindow * window )

static

Offers the seat's current serial.

This will mostly be useful on wayland sessions.

Since: 5.83

Definition at line 909 of file kwindowsystem.cpp.

◆ lowerWindow()

void KWindowSystem::lowerWindow ( WId win )

static

Lowers the given window.

This call is only for pagers and similar tools that represent direct user actions. Applications should not use it, they should keep using QWidget::lower() or XLowerWindow() if necessary.

Deprecated:: since 5.101, no known users.

Definition at line 642 of file kwindowsystem.cpp.

◆ mapViewport()

bool KWindowSystem::mapViewport ( )

static

Returns true if viewports are mapped to virtual desktops.

Definition at line 790 of file kwindowsystem.cpp.

◆ minimizeWindow() [1/2]

void KWindowSystem::minimizeWindow ( WId win )

static

Minimizes the window with id win.

On X11 this follows the protocol described in ICCCM section 4.1.4.

Parameters

win	The window to minimize

See also: unminimizeWindow()

Deprecated:: since 5.101, use KX11Extras::minimizeWindow() or QWindow::setState()

Definition at line 604 of file kwindowsystem.cpp.

◆ minimizeWindow() [2/2]

void KWindowSystem::minimizeWindow	(	WId	win,
		bool	animation
	)

static

Deprecated:: since 5.0 the animation is ignored.

Definition at line 620 of file kwindowsystem.cpp.

◆ numberOfDesktops()

int KWindowSystem::numberOfDesktops ( )

static

Returns the number of virtual desktops.

Returns: the number of virtual desktops

Deprecated:: since 5.101, use KX11Extras::numberOfDesktops()

Definition at line 423 of file kwindowsystem.cpp.

◆ numberOfDesktopsChanged

void KWindowSystem::numberOfDesktopsChanged ( int num )

signal

The number of desktops changed.

Parameters

num	the new number of desktops

Deprecated:: since 5.101, use KX11Extras::numberOfDesktopsChanged()

◆ platform()

KWindowSystem::Platform KWindowSystem::platform ( )

static

Returns the Platform used by the QGuiApplication.

This method allows to check for the used windowing system in a cheap and reliable way. The Platform gets resolved the first time the method is invoked and cached for further usages.

Returns: The Platform used by the QGuiApplication.

Since: 5.25

Definition at line 844 of file kwindowsystem.cpp.

◆ raiseWindow()

void KWindowSystem::raiseWindow ( WId win )

static

Raises the given window.

This call is only for pagers and similar tools that represent direct user actions. Applications should not use it, they should keep using QWidget::raise() or XRaiseWindow() if necessary.

Definition at line 635 of file kwindowsystem.cpp.

◆ readNameProperty()

QString KWindowSystem::readNameProperty	(	WId	window,
		unsigned long	atom
	)

static

Function that reads and returns the contents of the given text property (WM_NAME, WM_ICON_NAME,...).

Definition at line 766 of file kwindowsystem.cpp.

◆ requestXdgActivationToken()

void KWindowSystem::requestXdgActivationToken	(	QWindow *	win,
		uint32_t	serial,
		const QString &	app_id
	)

static

Requests an xdg_activation_v1 token for a specific window.

Parameters

win	window in behalf this request is made
serial	of the event that triggered the request
app_id	identifier of the application that we are launching

See also: lastInputSerial

Since: 5.83

Definition at line 884 of file kwindowsystem.cpp.

◆ self()

KWindowSystem * KWindowSystem::self ( )

static

Access to the singleton instance.

Useful mainly for connecting to signals.

Definition at line 367 of file kwindowsystem.cpp.

◆ setBlockingCompositing()

void KWindowSystem::setBlockingCompositing	(	WId	window,
		bool	active
	)

static

Sets whether the client wishes to block compositing (for better performance)

Since: 4.7

Deprecated:: since 5.101, no known users.

Definition at line 782 of file kwindowsystem.cpp.

◆ setCurrentDesktop()

void KWindowSystem::setCurrentDesktop ( int desktop )

static

Convenience function to set the current desktop to desktop.

See NETRootInfo.

Parameters

desktop the number of the new desktop

Deprecated:: since 5.101, use KX11Extras::setCurrentDesktop()

Definition at line 431 of file kwindowsystem.cpp.

◆ setCurrentXdgActivationToken()

void KWindowSystem::setCurrentXdgActivationToken ( const QString & token )

static

Sets the token that will be used when activateWindow is called next.

Since: 5.83

Definition at line 899 of file kwindowsystem.cpp.

◆ setDesktopName()

void KWindowSystem::setDesktopName	(	int	desktop,
		const QString &	name
	)

static

Sets the name of the specified desktop.

Parameters

desktop	the number of the desktop
name	the new name for the desktop

Deprecated:: since 5.101, use KX11Extras::setDesktopName()

Definition at line 682 of file kwindowsystem.cpp.

◆ setExtendedStrut()

void KWindowSystem::setExtendedStrut	(	WId	win,
		int	left_width,
		int	left_start,
		int	left_end,
		int	right_width,
		int	right_start,
		int	right_end,
		int	top_width,
		int	top_start,
		int	top_end,
		int	bottom_width,
		int	bottom_start,
		int	bottom_end
	)

static

Sets the strut of window win to left_width ranging from left_start to left_end on the left edge, and simiarly for the other edges.

For not reserving a strut, pass 0 as the width. E.g. to reserve 10x10 square in the topleft corner, use e.g. setExtendedStrut( w, 10, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0 ).

Parameters

win	the id of the window
left_width	width of the strut at the left edge
left_start	starting y coordinate of the strut at the left edge
left_end	ending y coordinate of the strut at the left edge
right_width	width of the strut at the right edge
right_start	starting y coordinate of the strut at the right edge
right_end	ending y coordinate of the strut at the right edge
top_width	width of the strut at the top edge
top_start	starting x coordinate of the strut at the top edge
top_end	ending x coordinate of the strut at the top edge
bottom_width	width of the strut at the bottom edge
bottom_start	starting x coordinate of the strut at the bottom edge
bottom_end	ending x coordinate of the strut at the bottom edge

Definition at line 710 of file kwindowsystem.cpp.

◆ setIcons()

void KWindowSystem::setIcons	(	WId	win,
		const QPixmap &	icon,
		const QPixmap &	miniIcon
	)

static

Sets an icon and a miniIcon on window win.

Parameters

win	the id of the window
icon	the new icon
miniIcon	the new mini icon

Deprecated:: since 5.101, use QWindow::setIcon() or QGuiApplication::setWindowIcon()

Definition at line 578 of file kwindowsystem.cpp.

◆ setMainWindow() [1/2]

void KWindowSystem::setMainWindow	(	QWidget *	subwindow,
		WId	mainwindow
	)

static

Sets the parent window of subwindow to be mainwindow.

This overrides the parent set the usual way as the QWidget parent, but only for the window manager - e.g. stacking order and window grouping will be affected, but features like automatic deletion of children when the parent is deleted are unaffected and normally use the QWidget parent.

This function should be used before a dialog is shown for a window that belongs to another application.

Deprecated:: since 5.62, use setMainWindow(QWindow *). If all you have is a QWidget*, you might need to call setAttribute(Qt::WA_NativeWindow, true); before calling >window()->windowHandle().

Definition at line 507 of file kwindowsystem.cpp.

◆ setMainWindow() [2/2]

void KWindowSystem::setMainWindow	(	QWindow *	subwindow,
		WId	mainwindow
	)

static

Sets the parent window of subwindow to be mainwindow.

This overrides the parent set the usual way as the QWidget or QWindow parent, but only for the window manager - e.g. stacking order and window grouping will be affected, but features like automatic deletion of children when the parent is deleted are unaffected and normally use the QObject parent.

This function should be used before a dialog is shown for a window that belongs to another application.

Definition at line 518 of file kwindowsystem.cpp.

◆ setOnActivities()

void KWindowSystem::setOnActivities	(	WId	win,
		const QStringList &	activities
	)

static

Moves window win to activities activities.

Parameters

win	the id of the window
activities	the list of activity UUIDs

Since: 5.1

See also: KWindowInfo::activities

Deprecated:: since 5.101, use KX11Extras::setOnActivities()

Definition at line 455 of file kwindowsystem.cpp.

◆ setOnAllDesktops()

void KWindowSystem::setOnAllDesktops	(	WId	win,
		bool	b
	)

static

Sets window win to be present on all virtual desktops if is true.

Otherwise the window lives only on one single desktop.

Parameters

win	the id of the window
b	true to show the window on all desktops, false otherwise

Deprecated:: since 5.101, use KX11Extras::setOnAllDesktops()

Definition at line 439 of file kwindowsystem.cpp.

◆ setOnDesktop()

void KWindowSystem::setOnDesktop	(	WId	win,
		int	desktop
	)

static

Moves window win to desktop desktop.

Parameters

win	the id of the window
desktop	the number of the new desktop

Deprecated:: since 5.101, use KX11Extras::setOnDesktop()

Definition at line 447 of file kwindowsystem.cpp.

◆ setShowingDesktop()

void KWindowSystem::setShowingDesktop ( bool showing )

static

Sets the state of the "showing desktop" mode of the window manager.

If on, windows are hidden and desktop background is shown and focused.

Parameters

showing if true, the window manager is put in "showing desktop" mode. If false, the window manager is put out of that mode.

Since: 5.7.0

Definition at line 695 of file kwindowsystem.cpp.

◆ setState()

void KWindowSystem::setState	(	WId	win,
		NET::States	state
	)

static

Sets the state of window win to state.

Parameters

win	the id of the window
state	the new flags that will be set

Definition at line 591 of file kwindowsystem.cpp.

◆ setStrut()

void KWindowSystem::setStrut	(	WId	win,
		int	left,
		int	right,
		int	top,
		int	bottom
	)

static

Convenience function for setExtendedStrut() that automatically makes struts as wide/high as the screen width/height.

Sets the strut of window win to left, right, top, bottom.

Parameters

win	the id of the window
left	the left strut
right	the right strut
top	the top strut
bottom	the bottom strut

Definition at line 743 of file kwindowsystem.cpp.

◆ setType()

void KWindowSystem::setType	(	WId	win,
		NET::WindowType	windowType
	)

static

Sets the type of window win to windowType.

Parameters

win	the id of the window
windowType	the type of the window (see NET::WindowType)

Definition at line 585 of file kwindowsystem.cpp.

◆ setUserTime()

void KWindowSystem::setUserTime	(	WId	win,
		long	time
	)

static

Sets user timestamp time on window win.

The timestamp is expressed as XServer time. If a window is shown with user timestamp older than the time of the last user action, it won't be activated after being shown. The most common case is the special value 0 which means not to activate the window after being shown.

Deprecated:: since 5.101, use QX11Info::setAppUserTime().

Definition at line 702 of file kwindowsystem.cpp.

◆ showingDesktop()

bool KWindowSystem::showingDesktop ( )

static

Returns the state of showing the desktop.

Definition at line 689 of file kwindowsystem.cpp.

◆ showingDesktopChanged

void KWindowSystem::showingDesktopChanged ( bool showing )

signal

The state of showing the desktop has changed.

◆ stackingOrder()

QList< WId > KWindowSystem::stackingOrder ( )

static

Returns the list of all toplevel windows currently managed by the window manager in the current stacking order (from lower to higher).

May be useful for pagers.

Returns: the list of all toplevel windows in stacking order

Deprecated:: since 5.101, use KX11Extras::stackingOrder()

Definition at line 407 of file kwindowsystem.cpp.

◆ stackingOrderChanged

void KWindowSystem::stackingOrderChanged ( )

signal

Emitted when the stacking order of the window changed.

The new order can be obtained with stackingOrder().

Deprecated:: since 5.101, use KX11Extras::stackingOrderChanged()

◆ strutChanged

void KWindowSystem::strutChanged ( )

signal

Something changed with the struts, may or may not have changed the work area.

Usually just using the workAreaChanged() signal is sufficient.

Deprecated:: since 5.101, use KX11Extras::strutChanged()

◆ transientFor()

WId KWindowSystem::transientFor ( WId window )

static

Returns the WM_TRANSIENT_FOR property for the given window, i.e.

the mainwindow for this window.

Parameters

window the id of the window

Deprecated:: Since 5.0, use KWindowInfo::transientFor

Definition at line 501 of file kwindowsystem.cpp.

◆ unminimizeWindow() [1/2]

void KWindowSystem::unminimizeWindow ( WId win )

static

Unminimizes the window with id win.

On X11 this follows the protocol described in ICCCM section 4.1.4.

Parameters

win	The window to unminimize

See also: minimizeWindow()

Deprecated:: since 5.101, use KX11Extras::unminimizeWindow() or QWindow::setState()

Definition at line 612 of file kwindowsystem.cpp.

◆ unminimizeWindow() [2/2]

void KWindowSystem::unminimizeWindow	(	WId	win,
		bool	animation
	)

static

Deprecated:: since 5.0 the animation is ignored.

Definition at line 628 of file kwindowsystem.cpp.

◆ updateStartupId()

void KWindowSystem::updateStartupId ( QWindow * window )

static

Updates the platform-specific startup id, if any.

This method is to be called when a running application instance is reused for handling the request to start this application. A typical use would be in the handler of the KDBusService activation signal.

For X11, this updates the id for the Startup Notification protocol, taking the id from QX11Info::nextStartupId(), if not empty. For Wayland, this updates the token for the XDG Activation protocol, taking the token from the "XDG_ACTIVATION_TOKEN" environment variable and then unsetting it, if not empty.

Parameters

window the main window (needed by X11 platform)

Since: 5.91

Definition at line 860 of file kwindowsystem.cpp.

◆ viewportToDesktop()

int KWindowSystem::viewportToDesktop ( const QPoint & pos )

static

Returns mapped virtual desktop for the given position in the viewport.

Definition at line 797 of file kwindowsystem.cpp.

◆ viewportWindowToDesktop()

int KWindowSystem::viewportWindowToDesktop ( const QRect & r )

static

Returns mapped virtual desktop for the given window geometry.

Definition at line 803 of file kwindowsystem.cpp.

◆ windowAdded

void KWindowSystem::windowAdded ( WId id )

signal

A window has been added.

Parameters

id	the id of the window

Deprecated:: since 5.101, use KX11Extras::windowAdded()

◆ windowChanged [1/4]

void KWindowSystem::windowChanged ( WId id )

signal

The window changed somehow.

Parameters

id	the id of the window

Deprecated:: since 5.80, use windowChanged(WId, NET::Properties, NET::Properties2);

◆ windowChanged [2/4]

QT_MOC_COMPAT void KWindowSystem::windowChanged	(	WId	id,
		const unsigned long *	properties
	)

signal

The window changed.

The properties parameter contains the NET properties that were modified (see netwm_def.h). First element are NET::Property values, second element are NET::Property2 values (i.e. the format is the same like for the NETWinInfo class constructor).

Parameters

id	the id of the window
properties	the properties that were modified

Deprecated:: since 5.0 use windowChanged(WId, NET::Properties, NET::Properties2)

◆ windowChanged [3/4]

void KWindowSystem::windowChanged	(	WId	id,
		NET::Properties	properties,
		NET::Properties2	properties2
	)

signal

The window changed.

Carries the NET::Properties and NET::Properties2 that were changed.

Parameters

id	the id of the window
properties	the properties that were modified
properties2	the properties2 that were modified

Since: 5.0

Deprecated:: since 5.101, use KX11Extras::windowChanged()

◆ windowChanged [4/4]

QT_MOC_COMPAT void KWindowSystem::windowChanged	(	WId	id,
		unsigned int	properties
	)

signal

The window changed.

The unsigned int parameter contains the NET properties that were modified (see netwm_def.h).

Parameters

id	the id of the window
properties	the properties that were modified

Deprecated:: Since 5.0

◆ windowInfo()

KWindowInfo KWindowSystem::windowInfo	(	WId	win,
		NET::Properties	properties,
		NET::Properties2	properties2 = `NET::Properties2()`
	)

static

Returns information about window win.

It is recommended to check whether the returned info is valid by calling the valid() method.

Parameters

win	the id of the window
properties	all properties that should be retrieved (see NET::Property enum for details). Unlisted properties cause related information to be invalid in the returned data, but make this function faster when not all data is needed.
properties2	additional properties (see NET::Property2 enum)

Returns: the window information

Deprecated:: Since 5.0, use KWindowInfo directly

Definition at line 393 of file kwindowsystem.cpp.

◆ windowRemoved

void KWindowSystem::windowRemoved ( WId id )

signal

A window has been removed.

Parameters

id	the id of the window that has been removed

Deprecated:: since 5.101, use KX11Extras::windowRemoved()

◆ windows()

const QList< WId > & KWindowSystem::windows ( )

static

Returns the list of all toplevel windows currently managed by the window manager in the order of creation.

Please do not rely on indexes of this list: Whenever you enter Qt's event loop in your application, it may happen that entries are removed or added. Your module should perhaps work on a copy of this list and verify a window with hasWId() before any operations.

Iteration over this list can be done easily with

QList<WId> windows = KWindowSystem::windows();
for (auto it = windows.cbegin(), end = windows.cend(); it != end; ++it) {
   ... do something here,  (*it) is the current WId.
}

Returns: the list of all toplevel windows

Deprecated:: since 5.101, use KX11Extras::windows()

Definition at line 385 of file kwindowsystem.cpp.

◆ workArea() [1/2]

QRect KWindowSystem::workArea	(	const QList< WId > &	excludes,
		int	desktop = `-1`
	)

static

Returns the workarea for the specified desktop, or the current work area if no desktop has been specified.

Excludes struts of clients in the exclude List.

Parameters

excludes	the list of clients whose struts will be excluded
desktop	the number of the desktop to check, -1 for the current desktop

Returns: the size and position of the desktop

Deprecated:: since 5.101, use KX11Extras::workArea()

Definition at line 666 of file kwindowsystem.cpp.

◆ workArea() [2/2]

QRect KWindowSystem::workArea ( int desktop = -1 )

static

Returns the workarea for the specified desktop, or the current work area if no desktop has been specified.

Parameters

desktop the number of the desktop to check, -1 for the current desktop

Returns: the size and position of the desktop

Deprecated:: since 5.101, use KX11Extras::workArea()

Definition at line 658 of file kwindowsystem.cpp.

◆ workAreaChanged

void KWindowSystem::workAreaChanged ( )

signal

The workarea has changed.

Deprecated:: since 5.101, use KX11Extras::workAreaChanged()

◆ xdgActivationTokenArrived

void KWindowSystem::xdgActivationTokenArrived	(	int	serial,
		const QString &	token
	)

signal

Activation token to pass to the client.

See also: requestXdgActivationToken; setCurrentXdgActivationToken

Since: 5.83

The documentation for this class was generated from the following files:

QList< WId >

QList::cend

QList::const_iterator cend() const const

KWindowSystem::windows

static QList< WId > windows()

Returns the list of all toplevel windows currently managed by the window manager in the order of crea...

Definition: kwindowsystem.cpp:385

QList::cbegin

QList::const_iterator cbegin() const const

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About KWindowSystem

KWindowSystem

Public Types

Properties

Signals

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ IconSource

◆ Platform

Member Function Documentation

◆ activateWindow() [1/2]

◆ activateWindow() [2/2]

◆ activeWindow()

◆ activeWindowChanged

◆ allowedActionsSupported()

◆ allowExternalProcessWindowActivation()

◆ clearState()

◆ compositingActive()

◆ compositingChanged

◆ constrainViewportRelativePosition()

◆ currentDesktop()

◆ currentDesktopChanged

◆ demandAttention()

◆ desktopName()

◆ desktopNamesChanged

◆ desktopToViewport()

◆ forceActiveWindow()

◆ groupLeader()

◆ hasWId()

◆ icccmCompliantMappingState()

◆ icon() [1/3]

◆ icon() [2/3]

◆ icon() [3/3]

◆ isPlatformWayland()

◆ isPlatformX11()

◆ lastInputSerial()

◆ lowerWindow()

◆ mapViewport()

◆ minimizeWindow() [1/2]

◆ minimizeWindow() [2/2]

◆ numberOfDesktops()

◆ numberOfDesktopsChanged

◆ platform()

◆ raiseWindow()

◆ readNameProperty()

◆ requestXdgActivationToken()

◆ self()

◆ setBlockingCompositing()

◆ setCurrentDesktop()

◆ setCurrentXdgActivationToken()

◆ setDesktopName()

◆ setExtendedStrut()

◆ setIcons()

◆ setMainWindow() [1/2]

◆ setMainWindow() [2/2]

◆ setOnActivities()

◆ setOnAllDesktops()

◆ setOnDesktop()

◆ setShowingDesktop()

◆ setState()

◆ setStrut()

◆ setType()

◆ setUserTime()

◆ showingDesktop()

◆ showingDesktopChanged

◆ stackingOrder()

◆ stackingOrderChanged

◆ strutChanged

◆ transientFor()

◆ unminimizeWindow() [1/2]

◆ unminimizeWindow() [2/2]

◆ updateStartupId()

◆ viewportToDesktop()

◆ viewportWindowToDesktop()

◆ windowAdded