python3+PyQt5 自定义窗口部件--使用窗口部件样式表的方法

2019-11-25 12:38:26

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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 python3import sysfrom 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：