When you assign a widget as the parent of a QLayout by passing it into the constructor, the layout is automatically set as the layout for that widget. In your code you are not only doing this, but explicitly calling setlayout(). This is no problem when when the widget passed is the same. If they … Read more
resize() might be better to use. Example usage: widget->resize(165, widget->height());
QWindow has been introduced in Qt 5.0 due to the gui / widgets split. QWidget now lives in its own library (QtWidgets); it was necessary to provide the abstraction of a “toplevel window” for non-widgets based applications, and thus QWindow was created — and lives in QtGui. There is an entire class of non-widgets based … Read more
Qt Quick 2 uses a scene graph for efficient rendering on the GPU. Unfortunately this makes it impossible to embed classic widgets into the scene. The old approach to embed such widgets with the help of QGraphicsProxyWidget works only with Qt Quick 1, because internally it uses a QGraphicsView for all the heavy lifting and … Read more
Edit the ui file outside of Qt Creator. Delete the rows with ‘zorder’ tags. Then open in Qt Creator and compile again. It worked for me then perfectly, the warning did not appear any more.
I stumbled upon the same problem and solved it by implementing the collapsible widget as a QScrollArea whose maximum height is animated by a QPropertyAnimation. But since I don’t use QDesigner, I can’t tell you if it works there. I still have one problem: Instead of only expanding towards the bottom direction, the collapsible widget … Read more