Customed QWidget can't get the size after layout by calling adjustSize()

[darrenleeleelee1]

When using normal QWidget(not customed) can get the size in a layout by calling adjustSize(), but I am wondering how to do the same thing in a Customed QWidget.
(QWidget may be a QLbael, or QGraphicsView etc.)

[Pl45m4]

@darrenleeleelee1

I'm not sure if understood your question right, but it makes no difference whether you have a standard QWidget or any custom QWidget derived class.
Every QWidget function will also work for custom widgets.

[darrenleeleelee1]

@Pl45m4 but my custom qwidget when I call adjustSize() it became QtCore.QSize(), but if is normal one that it will return a specific size which is the correct size in layout.

[Pl45m4]

@darrenleeleelee1

• https://doc.qt.io/qt-5/qwidget.html#adjustSize

Does your custom widget have a valid parent or a sizeHint set?

[darrenleeleelee1]

@Pl45m4 no but I don't know how to do that sizeHint() can return the right size in a layout.and I have a valid parent.