pyqt5学习笔记(4) QWidget

QWidget

基础窗口控件QWiget类是所有用户界面对象的基类，所有的窗口和空间都是直接或者间接继承自QWiget类。QWidget继承自 QObject 和 PaintDevice 。

1 常用方法

#!/usr/bin/env python3
# -*- coding:utf-8 -*-
# Author: Lancer  2020-05-08 08:45:33

from PyQt5.QtWidgets import  QMessageBox,QPushButton,QVBoxLayout,QWidget,QApplication,QPlainTextEdit,QHBoxLayout
from PyQt5.QtCore import *

class  QWidgetDemo(QWidget):
    def __init__(self):
        super(QWidgetDemo, self).__init__()
        self.resize(800,600)  #不含边框
        self.setWindowTitle("QWidget学习笔记")
        mainlayout = QVBoxLayout()
        self.setLayout(mainlayout)
        ####
        self.show_textedit = QPlainTextEdit()
        self.show_textedit.setReadOnly(True)
        h_layout = QHBoxLayout()
        mainlayout.addWidget(self.show_textedit)
        self.show_str = ""

        #QWidget不含边框的常用函数
        self.show_str += str(self.size())
        self.show_str += "  with: %d height:%d "%(self.width(),self.height())
        ## 含边框函数
        self.show_str +="\n"+ str(self.frameGeometry()) #获得窗口的大小和位置
        self.show_str += "\n" + "不含边框 宽度：%d  高度：%d "%(self.geometry().width(),self.geometry().height() ) #不行边框
        self.show_str += "\n" + "x，y获取客户区的左上角坐标（包含窗口的标题与边框部分） x：%d  y：%d " % (self.geometry().x(), self.geometry().y())

        self.show_str += "\n" + "maximumHeight: %d  maximumWidth：%d "%(self.maximumHeight(),  self.maximumWidth())
        self.show_str += "\n" + "minimumHeight: %d  minimumWidth：%d " % (self.minimumHeight(), self.minimumWidth())

        self.show_str += "\n" + str(self.layout()) + '\nlayout: ' + str(self.layoutDirection())

        self.show_textedit.setPlainText(self.show_str)

if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    test = QWidgetDemo()
    test.show()
    sys.exit(app.exec_())