LSessionLockManager Class Reference

Manages session lock requests and state changes. More...

Inheritance diagram for LSessionLockManager:

Public Types
enum	State
	Represents the state of the session. More...
Public Types inherited from LFactoryObject
enum class	Type : Int32
	Base factory object types. More...

Public Member Functions
	LSessionLockManager (const void *params) noexcept
	LSessionLockManager class constructor. More...
LClient *	client () const noexcept
	Gets the client locking the session. More...
const std::vector< LSessionLockRole * > &	roles () const noexcept
	Gets the Session Lock Surface Roles. More...
State	state () const noexcept
	Gets the current state of the session. More...
void	forceUnlock ()
	Forces the session to unlock. More...
virtual bool	lockRequest (LClient *client)
	Handles a lock request from a client. More...
virtual void	stateChanged ()
	Notifies a change in the session state. More...
Public Member Functions inherited from LFactoryObject
Type	factoryObjectType () const noexcept
	Gets the base factory object type. More...
Public Member Functions inherited from LObject
	LObject (const LObject &) noexcept
	Copy constructor. More...
LObject &	operator= (const LObject &) noexcept
	Assignment operator (each object has its own individual LWeak reference count). More...
void	setUserData (UIntPtr data) const noexcept
	Store an unsigned integer value/pointer. More...
UIntPtr	userData () const noexcept
	Retrieves the stored unsigned integer value/pointer. More...

Additional Inherited Members
Protected Member Functions inherited from LObject
	LObject () noexcept=default
	Constructor of the LObject class. More...
virtual	~LObject () noexcept
	Destructor of the LObject class. More...
void	notifyDestruction () noexcept
	Notifies the object destruction. More...

Detailed Description

Manages session lock requests and state changes.

Clients using the Session Lock protocol can request the compositor to lock the user session and display arbitrary graphics (see LSessionLockRole) such as an authentication form to allow the user to unlock the session.
This class allows you to accept/decline such requests (see lockRequest()) and monitor changes in the session state (stateChanged()).

Member Enumeration Documentation

State

enum State

Represents the state of the session.

Enumerator
Unlocked	The session is unlocked.
Locked	The session is locked.
DeadLocked	The session is locked, but the locking client died.

Constructor & Destructor Documentation

LSessionLockManager()

LSessionLockManager ( const void *  params )

noexcept

LSessionLockManager class constructor.

There is only one instance of LSessionLockManager, which can be accessed from LCompositor::sessionLockManager().

Parameters

params

Internal parameters provided in LCompositor::createObjectRequest().

Member Function Documentation

client()

LClient * client ( ) const

noexcept

Gets the client locking the session.

Returns

A pointer to the client locking the session, or nullptr if the session is unlocked or the locking client died.

roles()

const std::vector< LSessionLockRole * > & roles ( ) const

noexcept

Gets the Session Lock Surface Roles.

The client creates one for each output.

state()

State state ( ) const

inlinenoexcept

Gets the current state of the session.

forceUnlock()

void forceUnlock

(

)

Forces the session to unlock.

If the locking client dies without unlocking the session, the session remains locked (DeadLocked state). This method allows the compositor to forcibly unlock the session, ideally after a fallback user authentication mechanism.

lockRequest()

virtual bool lockRequest ( LClient *  client )

virtual

Handles a lock request from a client.

This method determines whether to grant permission for the client to lock the session. Returning true indicates permission, while false denies the request.

Warning

It's recommended that the client be a trusted and well-known entity.

This method is only invoked when the session state is Unlocked or DeadLocked. Louvre automatically ignores requests in the Locked state.

Parameters

client

The client requesting to lock the session.

Default Implementation

bool LSessionLockManager::lockRequest(LClient *client)
{
    L_UNUSED(client);
 
    /* Allow all requests by default. */
 
    return true;
}

stateChanged()

virtual void stateChanged ( )

virtual

Notifies a change in the session state.

Default Implementation

void LSessionLockManager::stateChanged()
{
    switch (state())
    {
    case Unlocked:
        break;
    case Locked:
        seat()->dnd()->cancel();
        seat()->touch()->sendCancelEvent(LTouchCancelEvent());
        seat()->keyboard()->setGrab(nullptr);
        seat()->pointer()->setDraggingSurface(nullptr);
 
        if (cursor()->output() && cursor()->output()->sessionLockRole())
        {
            seat()->pointer()->setFocus(cursor()->output()->sessionLockRole()->surface());
            seat()->keyboard()->setFocus(cursor()->output()->sessionLockRole()->surface());
        }
        else
        {
            seat()->pointer()->setFocus(nullptr);
            seat()->keyboard()->setFocus(nullptr);
        }
        break;
    case DeadLocked:
        break;
    }
}