PyQt5进度条填充整个QGroupBox吗？

Question

I am trying to get a progress bar to fill the whole width of a QGroupBox.

So far it looks like:

I am trying to get it to go all the way across. Here is the code:

def progress(self):
    gBox = QGroupBox('Progress')
    progress_bar = QProgressBar(gBox)
    progress_bar.setRange(0, 1)
    # progress_bar.setGeometry(30, 40, 200, 25)

    hbox = QHBoxLayout()
    hbox.addWidget(progress_bar)
    hbox.addStretch(1)
    gBox.setLayout(hbox)
    return gBox

Do I need to stretch the QGroupBox or the QHBoxLayout?

Answer 1

According to the docs :

void QBoxLayout::addStretch(int stretch = 0)

Adds a stretchable space (a QSpacerItem) with zero minimum size and stretch factor stretch to the end of this box layout.

That is, a spacer is added, that spacer is added to the end, so it pushes the widget to take the size of sizeHint() compressing it.

In your case you do not need it, so remove it.

def progress(self):
    gBox = QGroupBox('Progress')
    progress_bar = QProgressBar(gBox)
    progress_bar.setRange(0, 1)

    hbox = QHBoxLayout()
    hbox.addWidget(progress_bar)
    gBox.setLayout(hbox)
    return gBox