I don't know if it's what you're looking for, but on the left tool bar in both sf-sdk and qt qtcreator , you have a Help button.

In there you can find all functions available for qt and silica (silica only in sf-sdk qtcreator's Help).

Look in the content section, there is a brief description of each qt modules and also a list of all QML type for this module.

Good luck!