我一直在尝试使用python3和Qt4从现有窗口调用一个新窗口。
我使用Qt Designer(主应用程序和另一个)创建了两个窗口,我将Qt Designer生成的.ui文件转换为.py脚本 - 但我似乎无法创建新窗口主要的应用。
我试过这样做:
############### MAIN APPLICATION SCRIPT ################
from PyQt4 import QtCore, QtGui
import v2
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
_fromUtf8 = lambda s: s
class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName(_fromUtf8("Form"))
Form.resize(194, 101)
self.button1 = QtGui.QPushButton(Form)
self.button1.setGeometry(QtCore.QRect(50, 30, 99, 23))
self.button1.setObjectName(_fromUtf8("button1"))
self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)
def retranslateUi(self, Form):
Form.setWindowTitle(QtGui.QApplication.translate("Form", "Form", None, QtGui.QApplication.UnicodeUTF8))
self.button1.setText(QtGui.QApplication.translate("Form", "Ventana", None, QtGui.QApplication.UnicodeUTF8))
self.button1.connect(self.button1, QtCore.SIGNAL(_fromUtf8("clicked()")), self.mbutton1)
def mbutton1(self):
v2.main()
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
Form = QtGui.QWidget()
ui = Ui_Form()
ui.setupUi(Form)
Form.show()
sys.exit(app.exec_())
################## SECOND WINDOW #######################
from PyQt4 import QtCore, QtGui
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
_fromUtf8 = lambda s: s
class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName(_fromUtf8("Form"))
Form.resize(400, 300)
self.label = QtGui.QLabel(Form)
self.label.setGeometry(QtCore.QRect(160, 40, 57, 14))
self.label.setObjectName(_fromUtf8("label"))
self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)
def retranslateUi(self, Form):
Form.setWindowTitle(QtGui.QApplication.translate("Form", "Form", None, QtGui.QApplication.UnicodeUTF8))
self.label.setText(QtGui.QApplication.translate("Form", "LABEL 2", None, QtGui.QApplication.UnicodeUTF8))
def main():
import sys
app = QtGui.QApplication(sys.argv)
Form = QtGui.QWidget()
ui = Ui_Form()
ui.setupUi(Form)
Form.show()
sys.exit(app.exec_())
但我收到此错误消息:
QCoreApplication::exec: The event loop is already running
QPixmap: Must construct a QApplication before a QPaintDevice
答案 0 :(得分:12)
虽然pyuic
可以使用-x, --execute
选项创建可执行脚本,但它主要用于测试。
pyuic
的主要目的是从Qt Desgner ui
文件创建静态 python模块,允许您导入包含的GUI类进入你的申请。
假设您使用Qt Designer创建了两个ui
文件,并将其命名为v1.ui
和v2.ui
。
然后你会创建这样的两个python模块:
pyuic4 -o v1.py v1.ui
pyuic4 -o v2.py v2.ui
接下来,您将编写一个单独的main.py
脚本,从模块中导入GUI类,并根据需要创建它们的实例。
所以你的main.py
看起来像这样:
from PyQt4 import QtGui
from v1 import Ui_Form1
from v2 import Ui_Form2
class Form1(QtGui.QWidget, Ui_Form1):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.setupUi(self)
self.button1.clicked.connect(self.handleButton)
self.window2 = None
def handleButton(self):
if self.window2 is None:
self.window2 = Form2(self)
self.window2.show()
class Form2(QtGui.QWidget, Ui_Form2):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.setupUi(self)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
window = Form1()
window.show()
sys.exit(app.exec_())
请注意,我已稍微更改了GUI类的名称以避免命名空间冲突。要为GUI类提供更好的名称,只需在Qt Desgner中设置顶级类的objectName
属性即可。并且在完成更改后不要忘记重新运行pyuic
!
答案 1 :(得分:5)
您只能创建一个QApplication
。创建它之后,您可以创建所需的窗口数。
例如:
from PyQt4 import QtGui, QtCore
class MyWindow(QtGui.QDialog): # any super class is okay
def __init__(self, parent=None):
super(MyWindow, self).__init__(parent)
self.button = QtGui.QPushButton('Press')
layout = QtGui.QHBoxLayout()
layout.addWidget(self.button)
self.setLayout(layout)
self.button.clicked.connect(self.create_child)
def create_child(self):
# here put the code that creates the new window and shows it.
child = MyWindow(self)
child.show()
if __name__ == '__main__':
# QApplication created only here.
app = QtGui.QApplication([])
window = MyWindow()
window.show()
app.exec_()
每次单击该按钮都会创建一个新窗口。
您可以调整上面的示例以使用您使用Designer创建的窗口。
旁注:
永远不要编辑pyuic的结果。不应更改这些文件。这意味着:请勿将mbutton1
方法添加到Ui_Form
。
如果你有pyuic创建的文件mywindow_ui.py
,那么你创建文件mywindow.py
并输入如下内容:
from PyQt4 import QtCore, QtGui
from mywindow_ui import Ui_MyWindow
class MyWindow(QtGui.QWidget, Ui_MyWindow): #or whatever Q*class it is
def __init__(self, parent=None):
super(MyWindow, self).__init__(parent)
self.setupUi(self)
def create_child(self): #here should go your mbutton1
# stuff
#etc.
现在,您可以从主文件main.py
执行以下操作:
from PyQt4 import QtGui
from mywindow import MyWindow
# ...
if __name__ == '__main__':
app = QtGui.QApplication([])
window = MyWindow()
window.show()
app.exec_()