# Summary In this chapter we have looked at Qt Quick Controls 2. They offer a set of elements that provide more high-level concepts than the basic QML elements. For most scenarios, you will save memory and gain performance by using the Qt Quick Controls 2, as they are based around optimized C++ logic instead of Javascript and QML. We’ve demonstrated how different styles can be used, and how a common code base can be developed using file selectors. This way, a single code base can address multiple platforms with different user interactions and visual styles. Finally, we have looked at the Imagine style, which allows you to completely customize the look of a QML application through the use of graphical assets. In this way, an application can be reskinned without any code change whatsoever. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.novaflowos.com/start/qt6-qml-book/readme/ch06-controls/summary.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.