AbstractEventHandler

Since: BlackBerry 10.3.0

#include <bb/cascades/AbstractEventHandler>

The base class for event handlers.

Only classes deriving from the AbstractEventHandler class can be added to VisualNode::eventHandlers for event handling.

See also:

VisualNode::eventHandlers

Overview

Inheritance

bb::cascades::BaseObject
	bb::cascades::UIObject
		bb::cascades::AbstractEventHandler
			bb::cascades::NavigationHandler
			bb::cascades::TouchKeyboardHandler
			bb::cascades::TrackpadHandler

QML properties

Only has inherited QML properties

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

QML signals

Only has inherited QML signals

onCreationCompleted	: {}
onObjectNameChanged	: {}

Properties Index

Only has inherited properties

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

Public Functions Index

virtual	~AbstractEventHandler ()
virtual bool	event (QEvent *event)
void	setObjectName (const QString &name)
virtual Q_INVOKABLE QString	toDebugString () const
Q_INVOKABLE bb::cascades::UIConfig *	ui () const

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

(Only has inherited properties)

QDeclarativeListProperty< QObject > attachedObjects[read-only]

A hierarchical list of the UIObject's attached objects.

Since:

BlackBerry 10.0.0

QString objectName

This property is overridden from QObject.

See also:

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

bb::cascades::UIConfig ui[read-only]

An object that gives access to unit conversion routines.

QML use:

        // Size using design units
        Container {
            preferredWidth: ui.du(12)
            preferredHeight: ui.du(5)
        }

        // Size using design units, snap to whole pixels
        Container {
            preferredWidth: ui.sdu(13.5)
            preferredHeight: ui.sdu(7.5)
        }

        // Size using absolute pixel values
        Container {
            preferredWidth: ui.px(150)
            preferredHeight: ui.px(50)
        }

C++ use:

Container *container1 = Container::create().background(Color::Red);
UIConfig *ui = container1->ui();
container1->setPreferredWidth(ui->du(12));
container1->setPreferredHeight(ui->du(5));

Container *container2 = Container::create().background(Color::Green);
container2->setPreferredWidth(ui->sdu(13.5));
container2->setPreferredHeight(ui->sdu(7.5));

Container *container3 = Container::create().background(Color::Blue);
container3->setPreferredWidth(ui->px(150));
container3->setPreferredHeight(ui->sdu(50));

Since:

Blackberry 10.3.0

Public Functions

virtual~AbstractEventHandler ()

Destructor.

Since:

BlackBerry 10.3.0

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

Q_INVOKABLE bb::cascades::UIConfig * ui ()

Returns the UIConfig for this ui object.

The UIConfig can be used to perform unit conversions from design units (du) and snapped design units (sdu) to pixels.

Ownership remains with Cascades.

C++ use:

Container *container1 = Container::create().background(Color::Red);
UIConfig *ui = container1->ui();
container1->setPreferredWidth(ui->du(12));
container1->setPreferredHeight(ui->du(5));

Container *container2 = Container::create().background(Color::Green);
container2->setPreferredWidth(ui->sdu(13.5));
container2->setPreferredHeight(ui->sdu(7.5));

Container *container3 = Container::create().background(Color::Blue);
container3->setPreferredWidth(ui->px(150));
container3->setPreferredHeight(ui->sdu(50));

Return:

The UIConfig for this ui object.

Since:

BlackBerry 10.3.0

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 ()

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:

QmlDocument

Since:

BlackBerry 10.0.0

void objectNameChanged (
const QString &objectName)

This signal is emitted when the objectName property is changed.

See also:

QObject, BaseObject::objectName.

Since:

BlackBerry 10.0.0

AbstractEventHandler

Overview

Inheritance

QML properties

QML signals

Properties Index

Public Functions Index

Protected Functions Index

Signals Index

Properties

QDeclarativeListProperty< QObject > attachedObjects[read-only]

QString objectName

QObject parent[read-only]

bb::cascades::UIConfig ui[read-only]

Public Functions

virtual~AbstractEventHandler ()

virtual bool event (
QEvent *event)

void setObjectName (
const QString &name)

virtual Q_INVOKABLE QString toDebugString ()

Q_INVOKABLE bb::cascades::UIConfig * ui ()

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)

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AbstractEventHandler

Overview

Inheritance

QML properties

QML signals

Properties Index

Public Functions Index

Protected Functions Index

Signals Index

Properties

QDeclarativeListProperty< QObject > attachedObjects[read-only]

QString objectName

QObject parent[read-only]

bb::cascades::UIConfig ui[read-only]

Public Functions

virtual~AbstractEventHandler ()

virtual bool event (QEvent *event)

void setObjectName (const QString &name)

virtual Q_INVOKABLE QString toDebugString ()

Q_INVOKABLE bb::cascades::UIConfig * ui ()

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)

1. Choose your focus

2. Download the tools

3. Try the sample apps

4. Educate yourself

5. Start developing

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)