如何在PyQt中设置小部件的初始大小大于2/3的屏幕

Question

In the main window I have a central widget which has a natural size, and I would like to initialize it to this size. However, I do not want it to be fixed to this size; the user should be able to shrink or expand it.

The Qt documentation states that:

Note: The size of top-level widgets are constrained to 2/3 of the desktop's height and width. You can resize() the widget manually if these bounds are inadequate.

But I am unable to use the resize method as prescribed.

The following minimal example illustrates the problem: If width and height as given by w and h is less than 2/3 of that of the screen, then the window gets the expected size. If they are greater, the window gets some truncated size.

#!/usr/bin/env python
from PyQt4 import QtCore, QtGui
import sys
w = 1280; h = 720
app = QtGui.QApplication (sys.argv [1:])
frm = QtGui.QFrame ()
frm.sizeHint = lambda: QtCore.QSize (w, h)
win = QtGui.QMainWindow ()
win.setCentralWidget (frm)
win.show ()
sys.exit (app.exec_ ())

Answer 1

This should do it for you I think

from PyQt4 import QtCore, QtGui
import sys
w = 2280; h = 1520
app = QtGui.QApplication (sys.argv [1:])
frm = QtGui.QFrame ()
#frm.sizeHint = lambda: QtCore.QSize (w, h)
win = QtGui.QMainWindow ()
win.setCentralWidget (frm)
win.resize(w, h)
win.show ()
sys.exit (app.exec_ ())

Answer 2

The above answer is just fine, except that QApplication , QFrame and QMainWindow are not part of QtGui in the official PyQt5 . They are part of QtWidgets .

from PyQt5.QtWidgets import QApplication, QMainWindow, QFrame

w = 900; h = 600
app = QApplication (sys.argv [1:])
frm = QFrame ()
#frm.sizeHint = lambda: QtCore.QSize (w, h)
win = QMainWindow ()
win.setCentralWidget (frm)
win.resize(w, h)
win.show ()
sys.exit (app.exec_ ())