An Activity Host that can display multiple Activity nodes at a time. More...

#include <kanzi/ui/node/parallel_activity_host2d.hpp>

Inheritance diagram for kanzi::ParallelActivityHost2D:

Public Types
using	ConceptClass
	Parallel Activity Host 2D concept used to implement this class.

Public Types inherited from kanzi::ParallelActivityHostImpl< ContentLayout2D, ParallelActivityHost2D >
using	NodeTypeSharedPtr

Public Types inherited from kanzi::ActivityHostConcept
enum class	ActivationStatus { PreparingForActivation , ParallelAnimation , ExclusiveAnimation }
	Specifies possible stages for internal tracking of activation of an Activity. More...

using	ActivityInfoContainer

enum class	DeactivationStatus { ExclusiveAnimation , ParallelAnimation , WaitingForRelease }
	Specifies possible stages for internal tracking of deactivation of an Activity. More...

Public Types inherited from kanzi::ParallelActivityHostConcept
using	ParallelActivityHostContent
	Container for the content information for a ParallelActivityHost.

enum class	ParallelActivityHostFocusingPolicy { WhenHostHasFocus , AlwaysFocus , NeverFocus }
	Specifies the focusing policy that Kanzi applies to an activating Activity in a Parallel Activity Host. More...

Static Public Member Functions
static ParallelActivityHost2DSharedPtr	create (Domain *domain, string_view name)
	Creates a 2D Parallel Activity Host node.

static PropertyTypeEditorInfoSharedPtr	makeEditorInfo ()

Static Public Member Functions inherited from kanzi::ParallelActivityHostImpl< ContentLayout2D, ParallelActivityHost2D >
static PropertyTypeEditorInfoSharedPtr	makeEditorInfo ()

Static Public Member Functions inherited from kanzi::ActivityElement
static string	getFirstElement (string_view activationSequence)
	Gets the first element of the activation sequence.

static string	getRestToForward (string_view activationSequence)
	Gets the remainder of the activation sequence.

template<typename Type >
static bool	isActivityElement (const Type &object)
	Returns whether an object is an ActivityElement.

static PropertyTypeEditorInfoSharedPtr	makeEditorInfo ()

Static Public Member Functions inherited from kanzi::ActivityHostConcept
template<typename Type >
static bool	isActivityHost (const Type &object)
	Determines if an object is an ActivityHost.

static bool	isActivityHostMetaclass (const Metaclass *metaclass)
	Checks whether the given Metaclass is an ActivityHostConcept metaclass or contains it as a mixin metaclass.

static PropertyTypeEditorInfoSharedPtr	makeEditorInfo ()

Static Public Member Functions inherited from kanzi::ParallelActivityHostConcept
static PropertyTypeEditorInfoSharedPtr	makeEditorInfo ()
	Returns the PropertyType editor information for a Parallel Activity Host Concept.

Protected Member Functions
	ParallelActivityHost2D (Domain *domain, string_view name)
	Constructor.

Protected Member Functions inherited from kanzi::ParallelActivityHostImpl< ContentLayout2D, ParallelActivityHost2D >
vector< string >	getActivatingNames () override
	ActivityHostConcept::getActivatingNames implementation.

vector< NodeWeakPtr >	getActiveOrAttachedActivating () override
	ActivityHostConceptImpl::getActiveOrAttachedActivating implementation.

optional< ActivityHostConcept::ActivityInfo >	getActivityInfo (string_view name) const override
	ActivityHostConceptImpl::getActivityInfo implementation.

vector< NodeWeakPtr >	getAttachedActivityNodes () override
	ActivityHostConceptImpl::getAttachedActivityNodes implementation.

void	initialize ()
	Initializes this parallel activity host.

void	onActivateActivityOverride (string_view activationPath, bool resetHistory) override
	ActivityHostConcept::onActivateActivityOverride implementation.

void	onAttached () override
	Node::onAttached implementation.

void	onDetached () override
	Node::onDetached implementation.

void	onNodePropertyChanged (AbstractPropertyType propertyType, PropertyNotificationReason reason) override
	Node::onNodePropertyChanged implementation.

	ParallelActivityHostImpl (Domain *domain, string_view name)
	Constructor.

void	resolveFocusWithPolicy (Node &activityNode) override
	ActivityHostConceptImpl::resolveFocusWithPolicy implementation.

Protected Member Functions inherited from kanzi::ActivityHostConceptImpl< TBaseClass, TDerivedClass >
	ActivityHostConceptImpl (Domain *domain, string_view name)
	Constructor.

void	clearCurrentActivationTarget () const
	Clears current activation target.

void	initialize ()
	Initializes this Activity Host Concept.

void	registerInParentActivityElement () final
	ActivityElement::registerInParentActivityElement implementation.

void	resolveFocusOnActivated (Node &activityNode)
	Performs the necessary operations to fix the application focus when an Activity has activated in this Activity Host.

void	unregisterInParentActivityElement () final
	ActivityElement::unregisterInParentActivityElement implementation.

virtual	~ActivityHostConceptImpl ()=default
	Destructor.

Protected Member Functions inherited from kanzi::ActivityElementImpl< TBaseClass, TDerivedClass >
	ActivityElementImpl (Domain *domain, string_view name)
	Constructor.

void	initialize ()
	Initializes the activity element.

void	onAttached () override
	Node::onAttached implementation.

virtual void	onAttachedOverride ()
	Overrides the onAttached method.

void	onDetached () override
	Node::onDetached implementation.

void	onNodePropertyChanged (AbstractPropertyType propertyType, PropertyNotificationReason reason) override
	Node::onNodePropertyChanged implementation.

	~ActivityElementImpl () override=default
	Destructor.

Protected Member Functions inherited from kanzi::ActivityElement
optional< ActivityBrowserController::ActivityID >	getActivityID () const
	Gets the unique ID that is used by the implementation of the Activity Browser.

string	getPathInParent ()
	Gets the activation path of this activity element relative to its parent.

void	initialize ()
	Initializes the activity element.

bool	isRootActivityElement () const
	Returns whether an ActivityElement is the root Activity Host node of the Screen node.

void	onForceTrigger (const ActivityBrowserController::ForceTriggerMessageArguments &args)
	Message handler for ActivityBrowserController::ForceTriggerMessage.

void	onNodeInfoTreeAvailable (const ActivityBrowserController::NodeInfoTreeAvailableArguments &)
	Message handler for ActivityBrowserController::NodeInfoTreeAvailableMessage.

void	registerChildHost (string_view hostPath)
	Registers a child host in this activity element.

void	setActivityID (optional< ActivityBrowserController::ActivityID > activityID)
	Sets the unique ID that is used by the implementation of the Activity Browser.

void	unregisterChildHost (string_view hostName)
	Unregisters a child host from this activity element.

void	updateActivityBrowserProperties ()
	Triggers the Activity Browser to update the properties of the Activity Element.

Additional Inherited Members
Public Member Functions inherited from kanzi::ParallelActivityHostImpl< ContentLayout2D, ParallelActivityHost2D >
void	activate (const ActivityHostConcept::ActivityInfo &activityInfo, string_view restOfActivationPath)
	Activates a child Activity node.

void	deactivate (string_view name)
	Deactivates a child Activity node.

void	deserialize (string_view data) override
	ActivityElement::deserialize implementation.

void	onFinishedExclusiveDeactivatingAnimationInternal (const ActivityConcept::StatusChangedInternalMessageArguments &args)
	Message handler for FinishedExclusiveDeactivatingAnimationInternal message.

void	onFinishedParallelActivatingAnimationInternal (const ActivityConcept::StatusChangedInternalMessageArguments &args)
	Message handler for FinishedParallelActivatingAnimationInternal message.

void	onFinishedParallelDeactivatingAnimationInternal (const ActivityConcept::StatusChangedInternalMessageArguments &args)
	Message handler for FinishedParallelDeactivatingAnimationInternal message.

void	setActivationModifier (string_view activityName, BindingTokenWeakPtr weakModifier) override
	ActivityHostConcept::setActivationModifier implementation.

Public Member Functions inherited from kanzi::ActivityHostConceptImpl< TBaseClass, TDerivedClass >
void	notifyChildrenNodeTreeAvailable () override
	ActivityElement::notifyChildrenNodeTreeAvailable implementation.

string	serialize () override
	ActivityElement::serialize implementation.

Public Member Functions inherited from kanzi::ActivityElementImpl< TBaseClass, TDerivedClass >
const Node *	getNode () const override
	Gets the underlying Node object.

Node *	getNode () override
	Gets the underlying Node object.

Public Member Functions inherited from kanzi::ActivityElement
vector< NodeSharedPtr >::const_iterator	beginChildHosts () const
	Returns the begin iterator to the registered child Activity Host.

vector< NodeSharedPtr >::const_iterator	endChildHosts () const
	Returns the end iterator to the registered child Activity Host.

Node *	findChildHost (string_view hostName)
	Finds a child Activity Host by name.

vector< string >	getCommands () const
	Gets the list of commands handled by code behind of this activity element.

ActivityHistoryManager *	getHistoryManager () const
	Gets the history manager of this activity element.

ActivityElement *	getParentElement ()
	Gets the parent ActivityElement type node.

bool	isLeafActivityNode () const
	Returns whether an ActivityElement has a child Activity Host.

void	setCodeBehind (CodeBehindSharedPtr codeBehind)
	Attaches a code behind object.

void	setCodeBehind (const Metaclass *metaclass)
	Instantiates and attaches a code behind object by specifying its metaclass.

virtual	~ActivityElement ()=default
	Destructor.

Public Member Functions inherited from kanzi::ActivityHostConcept
virtual	~ActivityHostConcept ()=default
	Destructor.

Public Member Functions inherited from kanzi::ParallelActivityHostConcept
virtual	~ParallelActivityHostConcept ()=default
	Destructor.

Static Public Attributes inherited from kanzi::ActivityElement
static PropertyType< bool >	AttachedProperty

static PropertyType< bool >	PreserveHistoryProperty
	Enables the preservation of Activity property values when that Activity becomes inactive.

Static Public Attributes inherited from kanzi::ActivityHostConcept
static MessageType< ActivationMessageArguments >	ActivateActivityMessage
	You can send ActivateActivity to the Activity Host to activate an Activity.

static MessageType< ActivationMessageArguments >	DeactivateActivityMessage
	You can send DeactivateActivity to the Activity Host to deactivate an Activity.

static MessageType< ActivityPrefabMessageArguments >	ActivityPrefabAttachedMessage
	An Activity Host sends this message when it attaches the prefab of the Activity that is activated.

static MessageType< ActivityPrefabMessageArguments >	ActivityPrefabDetachedMessage
	An Activity Host sends this message when it attaches the prefab of the Activity that is activated.

static MessageType< RegisterActivityElementInternalMessageArguments >	RegisterHostInternalMessage
	Internal message sent by an Activity Host to its parent Activity or Activity Host to register the Activity Host in the parent.

static MessageType< UnregisterActivityElementInternalMessageArguments >	UnregisterHostInternalMessage
	Internal message sent by an Activity Host to its parent Activity or Activity Host to unregister the Activity Host from the parent.

Static Public Attributes inherited from kanzi::ParallelActivityHostConcept
static PropertyType< bool >	BringActivatedToFrontProperty
	Sets whether to show the activated Activity in front within its Parallel Activity Host.

static PropertyType< bool >	ActivationStackProperty
	Sets whether a Parallel Activity Host keeps a child Activity node active to satisfy the request from both ActivateActivityMessage activation and ApplyActivationAction mechanism.

static PropertyType< string >	ParallelActivityHostContentProperty
	Describes the content of a Parallel Activity Host node.

static PropertyType< ParallelActivityHostFocusingPolicy >	FocusOnActivationProperty
	Sets the focusing policy that Kanzi uses to decide whether it tries to set focus to an activating Activity in a Parallel Activity Host.

Protected Attributes inherited from kanzi::ActivityHostConceptImpl< TBaseClass, TDerivedClass >
string	m_activationTarget
	The name of the Activity that is the candidate to be the activation target.

bool	m_deserializing
	Indicates that this Activity Host is performing property deserialization.

bool	m_hostHadFocus
	Indicates that the Activity Host had focus before it started to activate new activation target Activity.

Detailed Description

An Activity Host that can display multiple Activity nodes at a time.

An Activity Host node defines the rules for when its Activity nodes are active. Kanzi has these Activity Host nodes:

Parallel Activity Host node can activate more than one of its child Activity nodes at a time.
Data-Driven Exclusive Activity Host and Exclusive Activity Host nodes can have only one of its child Activity nodes active at a time. When one child Activity node of a Data-Driven Exclusive Activity Host or an Exclusive Activity Host node is active, all other Activity nodes of that Activity Host node are inactive.

For example, you can use a Data-Driven Exclusive Activity Host or an Exclusive Activity Host node to toggle between views in your application.

See DataDrivenExclusiveActivityHost2D, DataDrivenExclusiveActivityHost3D, ExclusiveActivityHost2D, and ExclusiveActivityHost3D.

Parallel Activity Host can show multiple activities at the same time. When you activate an Activity node, a Parallel Activity Host node brings that Activity to the front. In a Parallel Activity Host node you can group Activity nodes, to show the groups in the same order that you defined in the node tree. When you activate an Activity node in a group, a Parallel Activity Host node brings to the front the Activity in that group. For example, this way you can implement the showing of critical messages, such as engine failure, in front of regular notifications, such as a phone call notification. In both groups a Parallel Activity Host node shows the Activity nodes in order of activation.

You can add Activity nodes to an Activity Host node in real-time. This enables you to use the Kanzi Engine API to generate Activity nodes or to add to the application another application for which the structure of Activity nodes is not known until you run the application. For example, you can use the API to generate a large number of popup windows that you want to show to the user.

The Activity and Activity Host nodes inherit from the ContentLayout class to lay out their content like a Content Layout node. See ContentLayout2D and ContentLayout3D.

See Activity2D and Activity3D.

Controlling Activity nodes in a Parallel Activity Host node

The type of the Activity Host node determines the way you control its child Activity nodes. When you use a Parallel Activity Host node, you can control its Activity nodes in these ways:

Synchronize the activation of an Activity node with your logic:
1. In an Activity Host node create a DataTrigger.
2. In the DataTrigger add a condition expression which evaluates to true or false, and which uses as input either Properties or a Data Source.
3. Add to the DataTrigger an ApplyActivationAction where you set the ApplyActivationAction::ActivationPathProperty to the Activity node that you want to activate.
The Activity node stays active as long as the condition expression in the DataTrigger evaluates to true. When the condition in the DataTrigger is no longer true, Kanzi reverts the activation. When using this approach, keep in mind that actions of a DataTrigger have higher priority than the actions of any other Trigger. See DataTrigger and ApplyActivationAction.
Control Activity nodes with ActivateActivityMessage and DeactivateActivityMessage:
1. In an Activity Host node create any Trigger.
2. Add to the Trigger a condition that defines when an Activity node is activated or deactivated.
3. Activate the Activity node using the ActivateActivityMessage and deactivate it using the DeactivateActivityMessage.
Keep in mind that actions of a DataTrigger have higher priority than the actions of any other Trigger. For example, if you use a DataTrigger with an ApplyActivationAction and any other Trigger to send a DeactivateActivityMessage or ActivateActivityMessage, the effect of the DeactivateActivityMessage or ActivateActivityMessage becomes visible only after Kanzi unapplies the ApplyPropertyAction. See Trigger.

Data and logic programming of Activity nodes

For each Parallel Activity Host node you can define properties that are specific to that Parallel Activity Host node.

When you create a property for a Parallel Activity Host node, set the namespace of that property to Activity Property. You can create properties with int, bool, float, and enum data types. If you use code behind for a Parallel Activity Host, Kanzi adds the properties of that Parallel Activity Host to the code behind.

The values of these properties implement the state machine and logic of your Kanzi application, which is why Kanzi preserves the values of these properties even when a Parallel Activity Host is virtual. When Kanzi virtualizes a Parallel Activity Host, it serializes the properties of that Parallel Activity Host and when Kanzi devirtualizes that Parallel Activity Host, it deserializes the state of that Parallel Activity Host and restores its property values.

Code behind

Code behind is a workflow where you associate code with an instance of a Parallel Activity Host instead of a type. In Kanzi Studio in the Activity Browser window, you can generate a code behind stub for any Parallel Activity Host node. This stub is associated with that particular Parallel Activity Host and has access to the properties of that Parallel Activity Host. In code behind you can write code that you can associate with the view or controller parts of the model-view-controller pattern. For example, you can:

Connect to a remote service when the Parallel Activity Host is instantiated and attached.
Install Kanzi command handlers and define their implementations, such as increase the volume when the user presses a button.
Implement complex UI interaction, such as drag-and-drop of data between UI elements.

Member Typedef Documentation

◆ ConceptClass

using kanzi::ParallelActivityHost2D::ConceptClass

Parallel Activity Host 2D concept used to implement this class.

Constructor & Destructor Documentation

◆ ParallelActivityHost2D()

kanzi::ParallelActivityHost2D::ParallelActivityHost2D	(	Domain *	domain,
		string_view	name )

explicitprotected

Constructor.

Parameters

domain	The domain the new node belongs to.
name	The name of the node.

Member Function Documentation

◆ create()

static ParallelActivityHost2DSharedPtr kanzi::ParallelActivityHost2D::create	(	Domain *	domain,
		string_view	name )

static

Creates a 2D Parallel Activity Host node.

Parameters

domain	The domain the new node belongs to.
name	The name of the node.

◆ makeEditorInfo()

static PropertyTypeEditorInfoSharedPtr kanzi::ParallelActivityHost2D::makeEditorInfo ( )