ResourceTracker
#include <bb/cascades/ResourceTracker>
Abstract base class inherited by all resource trackers.
A resource tracker is used to access the asynchronous features of resources, such as the state. All resources have a state that can be accessed, but some resources (for example, Image) also have details about the size which can be accessed. Trackers also have signals that are emitted when a state or other property is updated.
BlackBerry 10.0.0
Inheritance
| bb::cascades::BaseObject | ||
| bb::cascades::ResourceTracker | ||
| bb::cascades::ImageTracker | ||
QML properties
| state | : bb::cascades::ResourceState::Type [read-only] |
| objectName | : QString |
| parent | : QObject [read-only] |
QML signals
Properties Index
| bb::cascades::ResourceState::Type | state [read-only] |
| QString | objectName |
| QObject | parent [read-only] |
Public Functions Index
| virtual | ~ResourceTracker () |
| bb::cascades::ResourceState::Type | state () const |
| Q_INVOKABLE bool | hasErrors () const |
| void | setObjectName (const QString &name) |
| virtual Q_INVOKABLE QString | toDebugString () const |
Protected Functions Index
Only has inherited protected functions
| BaseObject (QObject *parent=0) |
Signals Index
| void | stateChanged (bb::cascades::ResourceState::Type newState) |
| void | creationCompleted () |
| void | objectNameChanged (const QString &objectName) |
Properties
bb::cascades::ResourceState::Type
The current state for the resource.
Default state is Unknown.
When the state changes, the stateChanged() signal will be emitted.
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.
QObject::objectName().
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.
BlackBerry 10.0.0
Public Functions
virtual
Destructor.
bb::cascades::ResourceState::Type
Returns the current resource state.
Current resource state.
BlackBerry 10.0.0
Q_INVOKABLE bool
Determines whether the resource is in one of the error states.
true if the image is in any error state, false otherwise.
ResourceTracker::State
BlackBerry 10.0.0
void
Sets the objectName property.
| Parameters | |
|---|---|
| name |
The new name for the object. |
BlackBerry 10.0.0
virtual Q_INVOKABLE QString
Returns a debug string representing this object.
A debug string for the object.
BlackBerry 10.0.0
Protected Functions
(Only has inherited protected functions)
Constructs an instance of BaseObject's subclass.
| Parameters | |
|---|---|
| parent |
An optional parent, defaults to 0. |
BlackBerry 10.0.0
Signals
void
Emitted when the state is changed for this resource.
| Parameters | |
|---|---|
| newState |
The new state. |
BlackBerry 10.0.0
void
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.
BlackBerry 10.0.0
void
This signal is emitted when the objectName property is changed.
BlackBerry 10.0.0