本文借用HTML的css语法，将样式表应用到窗口部件。这里只是个简单的例子，实际上样式表的语法很丰富。

以下类似于css：

StyleSheet = """

QComboBox { color: darkblue; }

QLineEdit { color: darkgreen; }

QLineEdit[mandatory="true"] { #mandatory="true"时，QLineEdit的样式会变化

background-color: rgb(255, 255, 127);

color: darkblue;

}

如果在选择器的前面加上一个句点，比如.QLineEdit，则选择器就会只应用于指定的类，而不会应用于这个类的子类。如果要求选择器仅用于某一特定窗口部件，则可以对该窗口部件调用setObjectName(),然后用该名字作为选择器的一部分。比如，如果有一个按钮，其对象名字是“findButton”，则应用于这个按钮的选择器就应该是QpushButton#findButton。有些窗口部件会有一些子控件。例如QComboBox会有一个箭头子控件，用户通过点击这个箭头来看到下拉列表。子控件可以指定为选择器的一部分–例如，QComboBox::drop-down。伪状态可以用一个冒号指定–例如，QCheckBox::checked.

#!/usr/bin/env python3

import sys

from PyQt5.QtWidgets import (QApplication, QComboBox, QDialog,

QDialogButtonBox, QGridLayout, QLabel, QLineEdit, QVBoxLayout)

class ContactDlg(QDialog):

StyleSheet = """

QComboBox { color: darkblue; }

QLineEdit { color: darkgreen; }

QLineEdit[mandatory="true"] {

background-color: rgb(255, 255, 127);

color: darkblue;

}

"""

def __init__(self, parent=None):

super(ContactDlg, self).__init__(parent)

forenameLabel = QLabel("&Forename:")

self.forenameEdit = QLineEdit()

forenameLabel.setBuddy(self.forenameEdit)

surnameLabel = QLabel("&Surname:")

self.surnameEdit = QLineEdit()

surnameLabel.setBuddy(self.surnameEdit)

categoryLabel = QLabel("&Category:")

self.categoryComboBox = QComboBox()

categoryLabel.setBuddy(self.categoryComboBox)

self.categoryComboBox.addItems(["Business", "Domestic",

"Personal"])

companyLabel = QLabel("C&ompany:")

self.companyEdit = QLineEdit()

companyLabel.setBuddy(self.companyEdit)

addressLabel = QLabel("A&ddress:")

self.addressEdit = QLineEdit()

addressLabel.setBuddy(self.addressEdit)

phoneLabel = QLabel("&Phone:")

self.phoneEdit = QLineEdit()

phoneLabel.setBuddy(self.phoneEdit)

mobileLabel = QLabel("&Mobile:")

self.mobileEdit = QLineEdit()

mobileLabel.setBuddy(self.mobileEdit)

faxLabel = QLabel("Fa&x:")

self.faxEdit = QLineEdit()

faxLabel.setBuddy(self.faxEdit)

emailLabel = QLabel("&Email:")

self.emailEdit = QLineEdit()

emailLabel.setBuddy(self.emailEdit)

self.buttonBox = QDialogButtonBox(QDialogButtonBox.Ok|

QDialogButtonBox.Cancel)

addButton = self.buttonBox.button(QDialogButtonBox.Ok)

addButton.setText("&Add")

addButton.setEnabled(False)

grid = QGridLayout()

grid.addWidget(forenameLabel, 0, 0)

grid.addWidget(self.forenameEdit, 0, 1)

grid.addWidget(surnameLabel, 0, 2)

grid.addWidget(self.surnameEdit, 0, 3)

grid.addWidget(categoryLabel, 1, 0)

grid.addWidget(self.categoryComboBox, 1, 1)

grid.addWidget(companyLabel, 1, 2)

grid.addWidget(self.companyEdit, 1, 3)

grid.addWidget(addressLabel, 2, 0)

grid.addWidget(self.addressEdit, 2, 1, 1, 3)

grid.addWidget(phoneLabel, 3, 0)

grid.addWidget(self.phoneEdit, 3, 1)

grid.addWidget(mobileLabel, 3, 2)

grid.addWidget(self.mobileEdit, 3, 3)

grid.addWidget(faxLabel, 4, 0)

grid.addWidget(self.faxEdit, 4, 1)

grid.addWidget(emailLabel, 4, 2)

grid.addWidget(self.emailEdit, 4, 3)

layout = QVBoxLayout()

layout.addLayout(grid)

layout.addWidget(self.buttonBox)

self.setLayout(layout)

self.lineedits = (self.forenameEdit, self.surnameEdit,

self.companyEdit, self.phoneEdit, self.emailEdit)

for lineEdit in self.lineedits:

lineEdit.setProperty("mandatory", True)

lineEdit.textEdited.connect(self.updateUi)

self.categoryComboBox.activated.connect(self.updateUi)

self.buttonBox.accepted.connect(self.accept)

self.buttonBox.rejected.connect(self.reject)

self.setStyleSheet(ContactDlg.StyleSheet)

self.setWindowTitle("Add Contact")

def updateUi(self):

mandatory = bool(self.companyEdit.property("mandatory"))

if self.categoryComboBox.currentText() == "Business":

if not mandatory:

self.companyEdit.setProperty("mandatory", True)

elif mandatory:

self.companyEdit.setProperty("mandatory", False)

if (mandatory !=

bool(self.companyEdit.property("mandatory"))):

self.setStyleSheet(ContactDlg.StyleSheet)

enable = True

for lineEdit in self.lineedits:

if (bool(lineEdit.property("mandatory")) and

not lineEdit.text()):

enable = False

break

self.buttonBox.button(QDialogButtonBox.Ok).setEnabled(enable)

if __name__ == "__main__":

app = QApplication(sys.argv)

form = ContactDlg()

form.show()

app.exec_()

运行结果：

以上这篇python3+PyQt5 自定义窗口部件--使用窗口部件样式表的方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。