2

我刚刚问了一个类似的问题,但是(对不起!)我想我需要更多帮助。我对 pyqt 中的信号有疑问。让我发布整个代码,它不长而且我更容易解释......

from PyQt4 import QtGui, QtCore, Qt
import time
import math

class FenixGui(QtGui.QWidget):

    def backgroundmousepressevent(self, event):
        print "test 1"
        self.offset = event.pos()


    def backgroundmousemoveevent(self, event):
        print "test 2"
        x=event.globalX()
        y=event.globalY()
        x_w = self.offset.x()
        y_w = self.offset.y()
        self.move(x-x_w, y-y_w)


    def __init__(self):
        super(FenixGui, self).__init__()

        # setting layout type
        hboxlayout = QtGui.QHBoxLayout(self)
        self.setLayout(hboxlayout)

        # hiding title bar
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)

        # setting window size and position
        self.setGeometry(200, 200, 862, 560)
        self.setAttribute(Qt.Qt.WA_TranslucentBackground)
        self.setAutoFillBackground(False)

        # creating background window label
        backgroundpixmap = QtGui.QPixmap("fenixbackground.png")
        self.background = QtGui.QLabel(self)
        self.background.setPixmap(backgroundpixmap)
        self.background.setGeometry(0, 0, 862, 560)

        # making window draggable by the window label
        self.connect(self.background,QtCore.SIGNAL("mousePressEvent()"),         self.backgroundmousepressevent)
        self.connect(self.background,QtCore.SIGNAL("mouseMoveEvent()"), self.backgroundmousemoveevent)


        # fenix logo
        logopixmap = QtGui.QPixmap("fenixlogo.png")
        self.logo = QtGui.QLabel(self)
        self.logo.setPixmap(logopixmap)
        self.logo.setGeometry(100, 100, 400, 150)


def main():

    app = QtGui.QApplication([])
    exm = FenixGui()
    exm.show()
    app.exec_()


if __name__ == '__main__':
    main()

好的,这就是代码,它只是一个简单的 gui,我想让它可以在屏幕上拖动,点击并拖动背景中的任何地方。我的问题是:当我按下或移动按钮时,backgroundmousepressevent 和 backgroundmousemoveevent 不会被触发。所以我想知道:错误在哪里?我拼错了什么还是什么?非常感谢你!

马泰奥

4

2 回答 2

5

在 Qt 中,事件不同于信号和槽。事件由QEvent传递给 s 的event()方法的对象表示QObject,它们通常被分派给专门的方法,例如mousePressEventmouseMoveEvent。由于它们不是信号,因此您无法将它们连接到插槽。

相反,只需重新实现事件函数来做自定义的事情。但是,请确保使用 调用原始实现super,除非您知道自己在做什么。

def mousePressEvent(self, event):
    super(FenixGui, self).mousePressEvent(event)
    print "test 1"
    self.offset = event.pos()

def mouseMoveEvent(self, event):
    super(FenixGui, self).mouseMoveEvent(event)
    print "test 2"
    x=event.globalX()
    y=event.globalY()
    x_w = self.offset.x()
    y_w = self.offset.y()
    self.move(x-x_w, y-y_w)

通常,当尝试连接到不存在的信号时,Qt 会通过向控制台写入警告消息来警告您。此外,您可以通过使用新式信号和插槽而不是旧式、更 C++-ishSIGNAL()函数来防止这种情况:

lineEdit = QtGui.QLineEdit()
lineEdit.valueChanged.connect(self.myHandlerMethod)
于 2011-08-22T09:30:31.740 回答
1

您正在尝试连接到 QWidget 的 mousePressEvent 和 mouseMoveEvent 信号,但它们不作为信号存在。尝试覆盖这些方法。这对我有用:

from PyQt4 import QtGui, QtCore, Qt
import time
import math

class FenixGui(QtGui.QWidget):

    def mousePressEvent(self, event):
        print "test 1"
        self.offset = event.pos()
        QtGui.QWidget.mousePressEvent(self, event)


    def mouseMoveEvent(self, event):
        print "test 2"
        x=event.globalX()
        y=event.globalY()
        x_w = self.offset.x()
        y_w = self.offset.y()
        self.move(x-x_w, y-y_w)
        QtGui.QWidget.mousePressEvent(self, event)

    def __init__(self):
        super(FenixGui, self).__init__()

        # setting layout type
        hboxlayout = QtGui.QHBoxLayout(self)
        self.setLayout(hboxlayout)

        # hiding title bar
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)

        # setting window size and position
        self.setGeometry(200, 200, 862, 560)
        self.setAttribute(Qt.Qt.WA_TranslucentBackground)
        self.setAutoFillBackground(False)

        # creating background window label
        backgroundpixmap = QtGui.QPixmap("fenixbackground.png")
        self.background = QtGui.QLabel(self)
        self.background.setPixmap(backgroundpixmap)
        self.background.setGeometry(0, 0, 862, 560)

        # fenix logo
        logopixmap = QtGui.QPixmap("fenixlogo.png")
        self.logo = QtGui.QLabel(self)
        self.logo.setPixmap(logopixmap)
        self.logo.setGeometry(100, 100, 400, 150)

def main():
    app = QtGui.QApplication([])
    exm = FenixGui()
    exm.show()
    app.exec_()

if __name__ == '__main__':
    main()
于 2011-08-22T09:43:35.187 回答