title: Qt and QML for UI and layouts. QtQuick
body: <p>I know QML is fine for making interfaces in Qt but, how about the layouts of these interfaces?
  I want to make an application looking like similar to, for example, spotify. But I want layouts to be "movable" and completely customizable by the user. Is it difficult to make that through QML? Should I better use the usual Qt layout stuff (gridlayout, graphicwidgets, graphic items...) ?</p>