python 和pyqt中 的 动态对象属性

Qt动态属性

Qt通过使用setProperty方法支持对象的自定义属性。

QObject.setProperty('PropertyName', value)

通常你想限制这只是布尔值 ，但它支持任何可以像字符串或int等设置到QVariant东西上。
如果你想在widget上存储属性，这真的很方便，但是当你想用它来切换对象的样式表样式时，这非常有用，因为我的文章的其余部分将有希望展示。

Qobject设置对象名称和属性

作用
用来作为id选择器和属性选择器,来设置样式

setObjectName方法
用来设置对象的名字,不同对象可以重复

label = QLabel()
label.setObjectName(“label”)
setProperty方法
用来设置属性

#设置label对象的hehe属性为呵呵
label.setProperty(“hehe”,‘呵呵’)
property方法
用来获取对象的属性

label.property(“hehe”)
在qss里面的属性选择器和iid选择器
[“属性”=“值”]

id
qss样式的设置和使用
qss样式表应该保存在一个后缀名为qss的文件里面
使用样式的代码如下:

with open(‘1.qss’,‘r’) as f:
qApp.setStyleSheet(f.read())

代码:

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

import sys

class MainWidget(QWidget):
    def __init__(self):
        super(MainWidget, self).__init__()

        self.setAutoFillBackground(True)
        self.setAttribute(Qt.WA_StyledBackground, True)
        self.setWindowTitle('QMainWindow 模板')

        # self.top_layout = QVBoxLayout()
        # self.setLayout(self.top_layout)
        self.resize(500, 300)

        self.setProperty("active", True)

        layout = QVBoxLayout(self)

        # Set the stylesheet
        self.setStyleSheet("""
            QPushButton[Test=true] {
                border: 2px solid #8f8f91;
                border-radius: 6px;
                background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1,
                                      stop: 0 #f6f7fa, stop: 1 #dadbde);
                min-width: 80px;
            }

            QPushButton#StyledButton[Test=true] {
                color: #F00;
                background-color: #000;
            }
                           """)

        # Create the button
        btn = QPushButton('Click Me One')
        btn.setProperty('Test', True)
        btn.setObjectName('StyledButton')
        btn.clicked.connect(lambda: self.toggle(btn))
        layout.addWidget(btn)

        btn2 = QPushButton('Click Me Two')
        btn2.setProperty('Test', True)
        btn2.clicked.connect(lambda: self.toggle(btn2))
        layout.addWidget(btn2)

    def toggle(self, widget):
        # Query the attribute .toBool()
        isTest = widget.property('Test')
        print('isTest = ', isTest)
        print('type(isTest) = ', type(isTest))
        widget.setProperty('Test', not isTest)

        # Update the style
        widget.setStyle(widget.style())






if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = MainWidget()
    main.show()

    sys.exit(app.exec_())

python 中的 动态属性:

# python判断对象是否有属性
class FooClass:
    pass


k = FooClass()

k.append = 12

try:

    # do some thing you need
    if hasattr(k, 'append'):
        print(k.append)
    else:
        print("没有 append 属性")

    if hasattr(k, 'orange'):
        print(1)
    else:
        print("没有 orange属性")
    print(k.att)

except AttributeError as e:
    # error: has not attribute
    pass

这个属性结合 pyqt 用法为:

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *

import sys

class MainWidget(QWidget):
    def __init__(self):
        super(MainWidget, self).__init__()

        self.setAutoFillBackground(True)
        self.setAttribute(Qt.WA_StyledBackground, True)
        self.setWindowTitle('QMainWindow 模板')

        self.top_layout = QVBoxLayout()
        self.setLayout(self.top_layout)
        self.resize(500, 300)

        self.setProperty("active", True)

        self.label = QLabel()
        self.label.setAlignment(Qt.AlignCenter)

        font = QFont()
        font.setFamily("Arial") #括号里可以设置成自己想要的其它字体
        font.setPointSize(18)
        self.label.setFont(font)

        self.button_one = QPushButton('one')
        self.button_one.id_ = 1

        self.button_two = QPushButton('two')
        self.button_two.id_ = 2

        self.button_one.clicked.connect(self.process_button_sig)
        self.button_two.clicked.connect(self.process_button_sig)

        self.button_three = QPushButton('three')
        self.button_four = QPushButton('four')

        self.button_three.clicked.connect(lambda: self.call_back_sig(3))
        self.button_four.clicked.connect(lambda: self.call_back_sig(4))

        self.top_layout.addWidget(self.label)
        self.top_layout.addWidget(self.button_one)
        self.top_layout.addWidget(self.button_two)

        self.top_layout.addWidget(self.button_three)
        self.top_layout.addWidget(self.button_four)

    def call_back_sig(self, num):
        print()
        print('call_back_sig = ', num)
        self.label.setText(str(num))

    def process_button_sig(self):
        print()
        print('------- process_button_sig -----')
        sender = self.sender()
        print('sender = ', sender)

        if hasattr(sender, 'id_'):
            print(sender.id_)
            self.label.setText(str(sender.id_))
        print('----------------- exit ------------------')



if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = MainWidget()
    main.show()

    sys.exit(app.exec_())