python - PyQt5 PushButton Hover 函数调用

Question

当鼠标悬停在按钮上时，我想调用一个函数。基本上我无法使用 QPushButton:hover 因为我要调用的函数非常复杂并且与按钮没有太大关系。这是一个示例代码。

import sys
from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QApplication, QLabel, QPushButton, QWidget

# ----------------------------------------------------

def firstText(myLabel):

    myLabel.setText("Wassup yall?")


def secondText(myLabel):

    myLabel.setText("Initial Text")

# ----------------------------------------------------

app = QApplication(sys.argv)
window = QWidget()
window.setWindowTitle("Wassup?")
window.setFixedWidth(1000)
window.setFixedHeight(600)
window.move(100, 50)


window.setStyleSheet(
    "background-color: rgb(208, 208, 208);"
)


button = QtWidgets.QPushButton(window)
button.setGeometry(100, 50, 120, 60)
button.setStyleSheet(
    "QPushButton {"
    "border: 0px solid;"
    "background-color: rgb(255, 50, 50);"
    "}"
)


label = QtWidgets.QLabel(window)
label.setGeometry(100, 120, 120, 60)
label.setStyleSheet(
    "background-color: rgb(128, 255, 64);"
)
label.setText("Initial Text")


window.show()
sys.exit(app.exec())

因此，我希望在将鼠标悬停在按钮上时调用函数“firstText”，并在离开悬停时调用函数“secondText”。

标签： pythonuser-interfacepyqt5hover

Answer 1

一种可能的解决方案是覆盖 enterEvent 和 leaveEvent 方法：

import sys
from PyQt5.QtCore import pyqtSignal
from PyQt5.QtWidgets import QApplication, QLabel, QPushButton, QWidget


class Button(QPushButton):
    entered = pyqtSignal()
    leaved = pyqtSignal()

    def enterEvent(self, event):
        super().enterEvent(event)
        self.entered.emit()

    def leaveEvent(self, event):
        super().leaveEvent(event)
        self.leaved.emit()


class Widget(QWidget):
    def __init__(self, parent=None):
        super().__init__()

        self.setWindowTitle("Wassup?")
        self.setFixedSize(1000, 600)
        self.move(100, 50)
        self.setStyleSheet("background-color: rgb(208, 208, 208);")

        button = Button(self)
        button.setGeometry(100, 50, 120, 60)
        button.setStyleSheet(
            "QPushButton {"
            "border: 0px solid;"
            "background-color: rgb(255, 50, 50);"
            "}"
        )

        self.label = QLabel(self)
        self.label.setGeometry(100, 120, 120, 60)
        self.label.setStyleSheet("background-color: rgb(128, 255, 64);")
        self.label.setText("Initial Text")

        button.entered.connect(self.handle_entered)
        button.leaved.connect(self.handle_leaved)

    def handle_entered(self):
        self.label.setText("Wassup yall?")

    def handle_leaved(self):
        self.label.setText("Initial Text")


app = QApplication(sys.argv)

window = Widget()
window.show()

sys.exit(app.exec())