Thanks for your help, Joe, it makes sense.
However resize() does work, even after assigning a layout to the parent.
menu.resize(500, 100) enlarges the menu enough to fit the buttons.
Altering size policies doesn't seem to have much of an effect here either.
from PyQt4.QtGui import *
from PyQt4.QtCore import *
class Window(QWidget):
def __init__(self, parent=None):
super(Window, self).__init__(parent)
menu = QWidget(self)
menu.setObjectName('Menu')
# menu.resize(500, 200)
btn1 = QPushButton('Hello')
btn2 = QPushButton('World')
for wid in (btn1, btn2, menu):
wid.setSizePolicy(QSizePolicy.MinimumExpanding, QSizePolicy.
MinimumExpanding)
layout = QBoxLayout(QBoxLayout.LeftToRight, menu)
layout.addWidget(btn1)
layout.addWidget(btn2)
layout.setSizeConstraint(QLayout.SetNoConstraint)
layout = QBoxLayout(QBoxLayout.TopToBottom, self)
self.setStyleSheet("#Menu {background-color: darkgray; }")
self.resize(300, 100)
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
win = Window()
win.show()
sys.exit(app.exec_())
On Friday, 3 January 2014 17:19:54 UTC, Joe Weidenbach wrote:
>
> From my understanding, once you're using a layout, the layout handles
> sizing on all of your contained objects, and resize() doesn't do much at
> all for you. The trick here is to set your minimumSize() and maximumSize()
> properties on the buttons, along with a look into QSizePolicy options for
> both horizontal and vertical, and then the layout will work off of those to
> handle sizing. I'll see if I have time later today to give you a few
> samples in case that doesn't make sense :).
>
> On 1/3/2014 4:33 AM, Marcus Ottosson wrote:
>
> This little caveat has been bothering me for a few hours.
>
> Adding a widget as a child of a parent widget makes it position itself
> at (0, 0). That's fine, I can move it around in resizeEvent. The size of
> the widget is determined by its children - say if the widget is a container
> for a couple of buttons, the amount of buttons and their default sizes
> govern the size of the container.
>
> But, installing a layout onto the parent of the container causes the
> container to seemingly force its children to resize to an inappropriate
> size.
>
> I could imaging that assigning a layout to a parent with children might
> implicitly assign its children to the layout, but that isn't what I would
> expect. Ultimately, I would like to have a completely free-floating widget.
>
> Uncomment the layout line to see what happens. This happens in both
> PyQt4 and 5 so I expect to be missing something trivial.
>
>
> from PyQt4.QtGui import *
> from PyQt4.QtCore import *
>
>
>
>
> class Window(QWidget):
> def __init__(self, parent=None):
> super(Window, self).__init__(parent)
>
>
> menu = QWidget(self)
> menu.setObjectName('Menu')
>
>
> btn1 = QPushButton('Hello')
> btn2 = QPushButton('World')
>
>
> layout = QBoxLayout(QBoxLayout.LeftToRight, menu)
> layout.addWidget(btn1)
> layout.addWidget(btn2)
>
>
> # layout = QBoxLayout(QBoxLayout.TopToBottom, self)
>
>
> self.setStyleSheet("#Menu {background-color: darkgray; }")
> self.resize(300, 100)
>
>
>
> if __name__ == '__main__':
> import sys
> app = QApplication(sys.argv)
>
>
> win = Window()
> win.show()
>
>
> sys.exit(app.exec_())
>
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