Cascades does not use QWidget because of several features needed which QtGUI addresses only starting with Qt5.
Guest post from Eun-Kyung Choi and Kizito Kasengulu – Ed.
Cascades™ and Qt are two major frameworks available on the BlackBerry® 10 platform. Qt on BlackBerry 10 provides a complete set of standard Qt 4.8 APIs with the exception of the QtWebKit module. BlackBerry 10 provides a selected set of APIs from the QtMobility project as well. I will provide an overview of Qt 4.8 APIs coverage on BlackBerry 10, with a focus on APIs that are different or not available on BlackBerry 10, and will refer to alternative Cascades APIs in relevant cases. More details are provided here:
To start, I wanted to share two fundamental facts about the use of Qt within Cascades and Qt on BlackBerry 10 in general:
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