TouchBehavior

#include <bb/cascades/TouchBehavior>

A series of touch-input reactions that can be added to a VisualNode.

TouchBehavior is built up of an arbitrary number of event reactions and cannot be modified after construction.

Here's an example of how to customize the touch behavior of a container. Upon receiving a touch down event in the target propagation phase, it tracks further touch events until a touch up occurs.

Container* pContainer = Container::create();

pContainer->addTouchBehavior(
    TouchBehavior::create()
        .addTouchReaction(TouchType::Down,
                          PropagationPhase::AtTarget,
                          TouchResponse::StartTracking));

And here's how to do the same in QML.

Container {
    touchBehaviors: [
        TouchBehavior {
            TouchReaction {
                eventType: TouchType.Down
                phase: PropagationPhase.AtTarget
                response: TouchResponse.StartTracking
            }
        }
    ]
}

When a control is tracking events, it receives them in the AtTarget phase. To listen for touch events in this phase, connect a slot to the VisualNode::touch() signal.

See:

VisualNode::addTouchBehavior(), TouchReaction, VisualNode::touch()

Since:

BlackBerry 10.0.0

Inheritance

bb::cascades::BaseObject
	bb::cascades::UIObject
		bb::cascades::TouchBehavior

QML properties

eventReactions	: QDeclarativeListProperty< bb::cascades::EventReaction > [read-only]
attachedObjects	: QDeclarativeListProperty< QObject > [read-only]
objectName	: QString
parent	: QObject [read-only]

QML signals

Only has inherited QML signals

onCreationCompleted	: {}
onObjectNameChanged	: {}

Properties Index

QDeclarativeListProperty< bb::cascades::EventReaction >	eventReactions [read-only]
QDeclarativeListProperty< QObject >	attachedObjects [read-only]
QString	objectName
QObject	parent [read-only]

Public Functions Index

	TouchBehavior ()
virtual	~TouchBehavior ()
virtual bool	event (QEvent *event)
void	setObjectName (const QString &name)
virtual Q_INVOKABLE QString	toDebugString () const

Static Public Functions Index

Builder

create ()

Protected Functions Index

Only has inherited protected functions

	BaseObject (QObject *parent=0)
virtual void	connectNotify (const char *signal)
virtual void	disconnectNotify (const char *signal)

Signals Index

Only has inherited signals

void	creationCompleted ()
void	objectNameChanged (const QString &objectName)

Properties

QDeclarativeListProperty< bb::cascades::EventReaction > eventReactions[read-only]

A QDeclarativeListProperty object that contains a list of event reactions.

Since:

BlackBerry 10.0.0

QDeclarativeListProperty< QObject > attachedObjects[read-only]

A hierarchical list of the UIObject's attached objects.

This QDeclarativeListProperty can contain any QObject. When a QObject is added to property, the UIObject takes ownership of the attached object.

This feature is typically used from QML to specify business logic object or any other shared objects for the subnodes of this UIObject. In C++ the same functionality can be achived by setting a parent of a QObject to be attached to the QObject which is going to own it.

QML usage example (MyObject is a custom class registered for QML using the qmlRegisterType() function):

Container {
    Label { text: "Title: " + myObject.title } 
    Label { text: "Subject: " + myObject.subject }
    attachedObjects: [
        MyObject { id: myObject
            title: "Hello World"
            subject: "Nice Day"
        }
    ]
}

Since:

BlackBerry 10.0.0

QString objectName

This property is overridden from QObject.

As the objectName property is overridden from the QObject class, this signal will not be emitted if setObjectName() function is called directly on QObject.

The default value of this property is QString::null.

See:

QObject::objectName().

Since:

BlackBerry 10.0.0

QObject parent[read-only]

A read-only property that represents this object's parent.

The parent of an object is specified using QObject::setParent(QObject*). The purpose of the property is to expose the object's parent to QML.

This property is read-only to prevent modifications from QML, where typically the parent is declaratively set. In C++ code, the parent can be explicitly set using QObject::setParent(QObject*), or implicitly set by adding it to a visual container.

The default value of this property is 0.

Since:

BlackBerry 10.0.0

Public Functions

TouchBehavior ()

Creates a TouchBehavior.

Since:

BlackBerry 10.0.0

virtual~TouchBehavior ()

Destructor.

Since:

BlackBerry 10.0.0

virtual bool event (
QEvent *event)

Overloaded to implement the event mechanism in Cascades.

Warning:

If this function is overridden, it must be called by the derived class for events to work properly in Cascades.

Parameters
event	The received event.

Return:

True if the received event was recognized and processed, false otherwise.

Since:

BlackBerry 10.0.0

void setObjectName (
const QString &name)

Sets the objectName property.

Parameters
name	The new name for the object.

Since:

BlackBerry 10.0.0

virtual Q_INVOKABLE QString toDebugString ()

Returns a debug string representing this object.

Return:

A debug string for the object.

Since:

BlackBerry 10.0.0

Static Public Functions

Builder create ()

Constructs a Builder used to create a touch behavior.

Return:

A Builder to construct a touch behavior.

Since:

BlackBerry 10.0.0

Protected Functions

(Only has inherited protected functions)

BaseObject (
QObject *parent)

Constructs an instance of BaseObject's subclass.

Parameters
parent	An optional parent, defaults to 0.

Since:

BlackBerry 10.0.0

virtual void connectNotify (
const char *signal)

Overloaded to implement the event mechanism in Cascades.

If this function is overridden, it must be called by the derived class for events to work properly in Cascades.

Parameters
signal	The connected signal.

Since:

BlackBerry 10.0.0

virtual void disconnectNotify (
const char *signal)

Overloaded to implement the event mechanism in Cascades.

If this function is overridden, it must be called by the derived class for events to work properly in Cascades.

Parameters
signal	The disconnected signal.

Since:

BlackBerry 10.0.0

Signals

(Only has inherited signals)

void creationCompleted ()

This signal is emitted only when this object is instantiated as a result of loading a QML document and creating the root node, or when an object is being constructed using its builder class.

This signal is emitted only when this object is instantiated as a result of loading a QML document and creating the root node (only after the root component that caused this instantiation has completed construction), or when the object is being constructed from its builder class. This signal is emitted to indicate that the construction and initialization of the object has been completed, the properties are initialized, and any QML binding values have been assigned to the object.

This signal is not emitted when the object is constructed from C++ using the constructor. If the object is constructed using its builder class, the signal is emitted when the the builder class returns the fully constructed object.

This signal can be used when there is an activity that needs to be performed, such as a property state integrity verification after the object is instantiated from a QML document or a builder, but before control is returned to the application.

See:

QmlDocument

Since:

BlackBerry 10.0.0

void objectNameChanged (
const QString &objectName)

This signal is emitted when the objectName property is changed.

See:

QObject, BaseObject::objectName.

Since:

BlackBerry 10.0.0

Inheritance

QML properties

QML signals

Properties Index

Public Functions Index

Static Public Functions Index

Protected Functions Index

Signals Index

Properties

QDeclarativeListProperty< bb::cascades::EventReaction > eventReactions[read-only]

QDeclarativeListProperty< QObject > attachedObjects[read-only]

QString objectName

QObject parent[read-only]

Public Functions

TouchBehavior ()

virtual~TouchBehavior ()

virtual bool event (QEvent *event)

void setObjectName (const QString &name)

virtual Q_INVOKABLE QString toDebugString ()

Static Public Functions

Builder create ()

Protected Functions

BaseObject (QObject *parent)

virtual void connectNotify (const char *signal)

virtual void disconnectNotify (const char *signal)

Signals

void creationCompleted ()

void objectNameChanged (const QString &objectName)

virtual bool event (
QEvent *event)

void setObjectName (
const QString &name)

BaseObject (
QObject *parent)

virtual void connectNotify (
const char *signal)

virtual void disconnectNotify (
const char *signal)

void objectNameChanged (
const QString &objectName)