Since: BlackBerry 10.2.0

#include <bb/cascades/DevelopmentSupport>

Provides a signal for receiving live QML updates from the Momentics IDE for BlackBerry.

This class makes it faster to work with a QML-based UI because QML updates can be sent to the running application to greatly improve development turnaround time.

When QML assets are changed and updated in the Momentics IDE, the assetsChanged() signal is emitted. The application can capture this signal and respond by refreshing the QML scene graph. All updated QML files in the application assets folder are sent to the device.

To use this feature, you must enable sending QML files to a device. In the Momentics IDE, in Window > Preferences > BlackBerry, select Send QML files to device on save, the application must be built in debug mode and the development support must be installed in valid application instance.





QML properties

Only has inherited QML properties

objectName: QStringInherited
parent: QObject [read-only]Inherited

QML signals

onAssetsChanged: {}
onCreationCompletedInherited: {}
onObjectNameChangedInherited: {}

Properties Index

Only has inherited properties

QObjectparent [read-only]Inherited

Public Functions Index

DevelopmentSupport (QObject *parent=0)
virtual ~DevelopmentSupport ()
voidsetObjectName (const QString &name)Inherited
virtual Q_INVOKABLE QStringtoDebugString () const Inherited

Static Public Functions Index

Protected Functions Index

Only has inherited protected functions

BaseObject (QObject *parent=0)Inherited

Signals Index

voidassetsChanged (const QUrl &mainQmlFile)
voidcreationCompleted ()Inherited
voidobjectNameChanged (const QString &objectName)Inherited


(Only has inherited properties)

QString objectNameInherited

This property is overridden from QObject.

See also:



BlackBerry 10.0.0

QObject parentInherited[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.


BlackBerry 10.0.0

Public Functions

DevelopmentSupport (

Constructs a DevelopmentSupport.


BlackBerry 10.2.0

virtual~DevelopmentSupport ()


void setObjectName (Inherited

Sets the objectName property.


The new name for the object.


BlackBerry 10.0.0

virtual Q_INVOKABLE QString toDebugString ()Inherited

Returns a debug string representing this object.


A debug string for the object.


BlackBerry 10.0.0

Static Public Functions

DevelopmentSupport * install ()

Installs development support to the Cascades application instance.

The Cascades Application object takes ownership of the DevelopmentSupport object that is created.


A pointer to the DevelopmentSupport instance that is created.


BlackBerry 10.3.1

Protected Functions

(Only has inherited protected functions)

BaseObject (Inherited

Constructs an instance of BaseObject's subclass.


An optional parent, defaults to 0.


BlackBerry 10.0.0


void assetsChanged (
  • const QUrl &mainQmlFile)

Emitted when updated QML assets have been uploaded from Momentics.


The QML file set as main file from Momentics.


BlackBerry 10.2.0

void creationCompleted ()Inherited

Emitted 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 indicates 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 also:



BlackBerry 10.0.0

void objectNameChanged (Inherited

This signal is emitted when the objectName property is changed.


BlackBerry 10.0.0

Last modified: 2016-08-19

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