Components customized QML: management of the events of the child controls

The tutorial here:

https://developer.BlackBerry.com/Cascades/documentation/UI/custom_components/custom_components_tutor...

Shows how to use the alias so that you can read the values of the properties of the child controls.

It would be good to have a code example that shows how to hang children change events. For example, if your custom control has a control segment, how to make the custom control user be notified when there is a click on segment control event or when the value of this control is changed.

Signals can be easily created in QML and exposed from a QML file that is customized to be listend to another. The following article explains the basic process:

https://developer.BlackBerry.com/Cascades/documentation/UI/signals_slots/index.html

In its simplest form, a signal is created in QML using the following format:

signal signalName (variableType variable1,...)

In the QML implementation of this custom control file, you will now have a manager of signal onSignalName created automatically for you.

I covered this topic in my last webcast and created a sample file that looks like this:

https://developer.BlackBerry.com/Cascades/documentation/videos/index.html

Beta 1: Astonishing UIS using the new framework of BlackBerry 10 - part 2

The sample was created against the Beta 1 of the NDK for BlackBerry 10 but the QML (TaskControl.qml) file should work fine in the beta 2 release. If you are having trouble please post it here and I will consider.

Kind regards

Tags: BlackBerry Developers

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