在 pyqt5 中对齐小部件中的按钮时出现问题

Question

我一直在尝试使用 python 语言的 pyqt5 GUI 创建一个带有图像背景和两个按钮(取消和确定)的小部件，带有图像和向下/向上推效果，但我有两个问题：

1 – 我无法对齐小部件中心的按钮

2 – 按钮事件发生两次

法典：

import sys
from PyQt5 import QtGui
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
class PicButton(QAbstractButton):
def __init__(self, pixmap, pixmap_pressed, id_button, parent=None):
super(PicButton, self).__init__(parent)
self.pixmap = pixmap
self.pixmap_pressed = pixmap_pressed
self.id_buton = id_button
self.pressed.connect(self.update)
self.released.connect(self.update)
def paintEvent(self, event):
if self.isDown():
pix = self.pixmap_pressed
print("botao pressionado: ", self.id_buton)
else:
pix = self.pixmap
painter = QPainter(self)
painter.drawPixmap(event.rect(), pix)
def enterEvent(self, event):
self.update()
def leaveEvent(self, event):
self.update()
def sizeHint(self):
return QSize(131, 82)

app = QApplication(sys.argv)
window = QWidget()
window.setGeometry(800, 450, 800, 450)
pixmap = QPixmap("background.png")
brush = QBrush(pixmap)
palette = QPalette()
palette.setBrush(QPalette.Background, brush)
window.setPalette(palette)
button1 = PicButton(QtGui.QPixmap("cancel_up.png"), QtGui.QPixmap("cancel_down.png"), "cancel")
button2 = PicButton(QtGui.QPixmap("ok_up.png"), QtGui.QPixmap("ok_down.png"), "ok")
layout = QHBoxLayout()
layout.addStretch(1)
layout.addWidget(button1)
layout.addWidget(button2)
layout.setAlignment(Qt.AlignCenter)
window.setLayout(layout)
window.show()
sys.exit(app.exec_())

在链接中获取图像：https://www.filedropper.com/imagens

有人可以告诉我我做错了什么吗？

Answer 1

我无法对齐小部件中心的按钮：如果您在按钮 1 之前应用了addStretch()以使其对称，则必须在按钮 2 之后设置另一个addStretch()

按钮事件发生两次：QAbstractButton 在按下按钮时已调用 update 方法，因此无需将按下或释放的信号连接到update()方法或在enterEvent()和leaveEvent()方法中调用它。

考虑到上述情况，解决方案是：

import sys
from PyQt5 import QtCore, QtGui, QtWidgets
class PicButton(QtWidgets.QAbstractButton):
def __init__(self, pixmap, pixmap_pressed, id_button, parent=None):
super(PicButton, self).__init__(parent)
self.pixmap = pixmap
self.pixmap_pressed = pixmap_pressed
self.id_buton = id_button
def paintEvent(self, event):
if self.isDown():
pix = self.pixmap_pressed
print("botao pressionado: ", self.id_buton)
else:
pix = self.pixmap
painter = QtGui.QPainter(self)
painter.drawPixmap(event.rect(), pix)
def sizeHint(self):
return QtCore.QSize(131, 82)
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
window =QtWidgets. QWidget()
window.setGeometry(800, 450, 800, 450)
pixmap = QtGui.QPixmap("background.png")
brush = QtGui.QBrush(pixmap)
palette = QtGui.QPalette()
palette.setBrush(QtGui.QPalette.Background, brush)
window.setPalette(palette)
button1 = PicButton(QtGui.QPixmap("cancel_up.png"), QtGui.QPixmap("cancel_down.png"), "cancel")
button2 = PicButton(QtGui.QPixmap("ok_up.png"), QtGui.QPixmap("ok_down.png"), "ok")
layout = QtWidgets.QHBoxLayout(window)
layout.addStretch()
layout.addWidget(button1)
layout.addWidget(button2)
layout.addStretch()
window.show()
sys.exit(app.exec_())