使用 Qt 在 Python 中调整主窗口大小

Question

I have a gui in ui_main.py file (designed in Qt Designer). I load it in my main *.py file in this way:

from PyQt4 import QtGui, QtCore
from ui_main import Ui_MainWindow
class MyForm(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QMainWindow.__init__(self)
        self.ui = Ui_MainWindow()
        self.ui.setupUi(self)
...

ui_main.py file:

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    _fromUtf8 = lambda s: s

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(667, 559)

I need to resize my main window during application start. My main problem is that I can't get access to Main window object.

 self.ui.MainWindow.resize(300,300)
 AttributeError: 'Ui_MainWindow' object has no attribute 'MainWindow'

If I add to ui_main.py file:

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        self.uiui = MainWindow

I can resize my main window with:

self.ui.uiui.resize(300,300) 

But I know that it's very bad to edit generated ui file. How can I resize my main window without editing a gui file?

Answer 1

The ui module created by pyuic (via Qt Designer) is just a simple helper class with a couple of initialization methods.

Both methods take an instance of the top-level ui class from Qt Designer (usually a QMainWindow ), and then add the all the ui elements to that instance. This ensures that everything created in Qt Designer is accessible from the top-level widget.

So your MyForm subclass passes self (an instance of QMainWindow ) to setupUi , which then becomes the MainWindow variable you see in your ui file.

This means you can resize your main window by simply doing:

self.resize(300, 300)