21-对话框 QFontDialog.py

#!/usr/bin/env python3
# -*- coding:utf-8 -*-
'''
In this example, we determine the event sender
object.

author:Administrator
datetime:2018/3/18/018 12:32
software: PyCharm
'''

import sys
from PyQt5.QtWidgets import QWidget, QVBoxLayout, QPushButton, QSizePolicy, QLabel, QFontDialog, QApplication

# 在这个例子中，我们创建了一个按钮和一个标签，通过QFontDialog来改变标签的字体
class Example(QWidget):

    def __init__(self):
        super().__init__()

        self.initUI()

    def initUI(self):

        vbox = QVBoxLayout()

        btn = QPushButton('Dialog', self)
        btn.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)

        btn.move(20, 20)

        vbox.addWidget(btn)

        btn.clicked.connect(self.showDialog)

        self.lbl = QLabel('Knowledge only matters', self)
        self.lbl.move(130, 20)

        vbox.addWidget(self.lbl)
        self.setLayout(vbox)

        self.setGeometry(300, 300, 250, 180)
        self.setWindowTitle('Font dialog')
        self.show()

    def showDialog(self):
        # 这一行代码弹出字体选择对话框，getFont()方法返回字体名称和ok参数，如果用户点击了ok他就是True,否则就是false
        font, ok = QFontDialog.getFont()
        # 如果我们点击了ok，标签的字体就会被改变
        if ok:
            self.lbl.setFont(font)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())