PyQt5鼠标跟踪不起作用

Question

我发现了一个当鼠标悬停在 QPushButton 上时更改图标的示例。我试图将其转换为我的代码，但存在一些问题。首先检查我找到的示例，它真的很短。 http://paste.ubuntu.com/17302717/

如果鼠标在按钮上，这些代码会改变按钮的图标。这是我引发错误的代码

return QPushButton.mouseMoveEvent(QPushButton, event) TypeError: QPushButton.mouseMoveEvent(QMouseEvent): 未绑定方法的第一个参数必须有类型'QPushButton'

from PyQt5.QtWidgets import QApplication,QPushButton,QWidget
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import QSize

import PyQt5.QtWidgets,PyQt5.QtCore,sys



class cssden(QMainWindow):
    def __init__(self):
        super().__init__()

        self.mwidget = QMainWindow(self)
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)

        self.setMouseTracking(True)

        self.setFixedSize(1400,923)


        #Button
        self.mbutton = QPushButton(self)
        self.mbutton.setStyleSheet("background-color: rgb(30,30,30);"
                                   "background-image: url('resources/twitter-logo.png');"
                                   "border: 3px solid black;"
                                   "background-position: center;"
                                   )
        self.mbutton.setGeometry(2,300,110,60)
        self.mbutton.clicked.connect(self.yaz)

        self.show()
    def mouseMoveEvent(self, event):

        if event.pos().x()>self.mbutton.width()-10 or event.pos().y()>self.mbutton.height()-10\
                    or event.pos().x() < 10 or event.pos().y()< 10:
            bmp = QIcon("1.png")
            self.mbutton.setIcon(bmp)

        else:
            bmp = QIcon('2.png')
            self.mbutton.setIcon(bmp)
        self.mbutton.setIconSize(QSize(200,200))
        return QPushButton.mouseMoveEvent(self, event)

    def yaz(self):
        print ("button pressed")

app = QApplication(sys.argv)
app.setStyleSheet("QMainWindow{background-color: rgb(30,30,30);border: 2px solid rgb(20,20,20)}")

ex = cssden()
sys.exit(app.exec_())

我不明白问题出在哪里。我尝试将return QPushButton.mouseMoveEvent(self, event) 更改为return QPushButton.mouseMoveEvent(QPushButton, event) 和其他版本，但没有成功。我错过了什么，我该如何解决这个问题？

编辑：我将self.setMouseTracking(True) 更改为self.mbutton.setMouseTracking(True)，现在没有错误，但图标并没有改变。为什么图标没有变化？

Answer 1

您的代码存在一些问题，即导入问题。但主要问题是你不需要这个：return QPushButton.mouseMoveEvent(self, event)

尝试对您的代码进行以下更正：

from PyQt5.QtWidgets import QApplication,QPushButton,QWidget from
PyQt5.QtGui import QIcon from PyQt5.QtCore import QSize from PyQt5
import QtCore, QtWidgets, QtGui

import PyQt5.QtWidgets,PyQt5.QtCore,sys

class cssden(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()

        # self.mwidget = QMainWindow(self)
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)

        self.setMouseTracking(True)

        self.setFixedSize(1400,923)


        #Button
        self.mbutton = QPushButton(self)
        self.mbutton.setStyleSheet("background-color: rgb(30,30,30);"
                                   "background-image: url('resources/twitter-logo.png');"
                                   "border: 3px solid black;"
                                   "background-position: center;"
                                   )
        self.mbutton.setGeometry(2,300,110,60)
        self.mbutton.clicked.connect(self.yaz)

        self.show()
    def mouseMoveEvent(self, event):

        if event.pos().x()>self.mbutton.width()-10 or event.pos().y()>self.mbutton.height()-10\
                    or event.pos().x() < 10 or event.pos().y()< 10:
            bmp = QIcon("1.png")
            self.mbutton.setIcon(bmp)
        else:
            print(1)
            bmp = QIcon('2.png')
            self.mbutton.setIcon(bmp)
        self.mbutton.setIconSize(QSize(200,200))
        # return self.mbutton.mouseMoveEvent(event)

    def yaz(self):
        print ("button pressed")

app = QApplication(sys.argv)
app.setStyleSheet("QMainWindow{background-color:
rgb(30,30,30);border: 2px solid rgb(20,20,20)}")

ex = cssden() sys.exit(app.exec_())

无论如何，我并不真正理解您要达到的目标。如果您需要为按钮创建某种悬停效果，还有其他更好的方法。比如这个：

from PyQt5.QtWidgets import QApplication,QPushButton,QWidget
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import QSize
from PyQt5 import QtCore, QtWidgets, QtGui

import PyQt5.QtWidgets,PyQt5.QtCore,sys

class HoverButton(QPushButton):
    mouseHover = QtCore.pyqtSignal(bool)

    def __init__(self, parent=None):
        QPushButton.__init__(self, parent)
        self.setMouseTracking(True)

    def enterEvent(self, event):
        self.mouseHover.emit(True)
        bmp = QIcon("1.png")
        self.setIcon(bmp)
        self.setIconSize(QSize(200,200))

    def leaveEvent(self, event):
        self.mouseHover.emit(False)
        bmp = QIcon("2.png")
        self.setIcon(bmp)
        self.setIconSize(QSize(200,200))

class cssden(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()

        # self.mwidget = QMainWindow(self)
        self.setWindowFlags(QtCore.Qt.FramelessWindowHint)

        self.setMouseTracking(True)

        self.setFixedSize(1400, 923)


        #Button
        self.mbutton = HoverButton(self)
        self.mbutton.setStyleSheet("background-color: rgb(30,30,30);"
                                   "background-image: url('resources/twitter-logo.png');"
                                   "border: 3px solid black;"
                                   "background-position: center;"
                                   )
        self.mbutton.setGeometry(2,300,110,60)
        self.mbutton.clicked.connect(self.yaz)
        self.show()

    def yaz(self):
        print("button pressed")

app = QApplication(sys.argv)
app.setStyleSheet("QMainWindow{background-color: rgb(30,30,30);border: 2px solid rgb(20,20,20)}")

ex = cssden()
sys.exit(app.exec_())

我会建议以下答案：

PyQT how to make a QEvent.Enter on QPushbutton?（我的解决方案就是基于这个方法）

Pyqt Mouse hovering on a QPushButton