pyqt5控件知识点（下）

QLineEdit控件 文本输入框

# QLineEdit控件与回显模式
from PyQt5.QtWidgets import *
import sys
class QLineEditEchoMode(QWidget) :
    def __init__(self):
        super(QLineEditEchoMode,self).__init__()
        self.initUI()
    def initUI(self):
        self.setWindowTitle('文本输入框的回显模式')
        formLayout = QFormLayout()
        normalLineEdit = QLineEdit()
        noEchoLineEdit = QLineEdit()
        passwordLineEdit = QLineEdit()
        passwordEchoOnEditLineEdit = QLineEdit()
        formLayout.addRow("Normal",normalLineEdit)
        formLayout.addRow("NoEcho", noEchoLineEdit)
        formLayout.addRow("Password",passwordLineEdit)
        formLayout.addRow("PasswordEchoOnEdit",passwordEchoOnEditLineEdit)
        normalLineEdit.setPlaceholderText("Normal")
        noEchoLineEdit.setPlaceholderText("NoEcho")
        passwordLineEdit.setPlaceholderText("Password")
        passwordEchoOnEditLineEdit.setPlaceholderText("PasswordEchoOnEdit")
        normalLineEdit.setEchoMode(QLineEdit.Normal)
        noEchoLineEdit.setEchoMode(QLineEdit.NoEcho)
        passwordLineEdit.setEchoMode(QLineEdit.Password)
        passwordEchoOnEditLineEdit.setEchoMode(QLineEdit.PasswordEchoOnEdit)
        self.setLayout(formLayout)
if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QLineEditEchoMode()
    main.show()
    sys.exit(app.exec_())

按钮控件（QPushButton）

#按钮控件（QPushButton）
import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
class QPushButtonDemo(QDialog) :
    def __init__(self):
        super(QPushButtonDemo,self).__init__()
        self.initUI()
    def initUI(self):
        self.setWindowTitle('QPushButton Demo')
        layout = QVBoxLayout()
        self.button1 = QPushButton('第1个按钮')
        self.button1.setText('First Button1')
        self.button1.setCheckable(True)
        self.button1.toggle()
        self.button1.clicked.connect(self.buttonState)
        self.button1.clicked.connect(lambda :self.whichButton(self.button1))
        layout.addWidget(self.button1)
        # 在文本前面显示图像
        self.button2 = QPushButton('图像按钮')
        self.button2.setIcon(QIcon(QPixmap('./images/python.png')))
        self.button2.clicked.connect(lambda:self.whichButton(self.button2))
        layout.addWidget(self.button2)
        self.button3 = QPushButton('不可用的按钮')
        self.button3.setEnabled(False)
        layout.addWidget(self.button3)
        self.button4 = QPushButton('&MyButton')
        self.button4.setDefault(True)
        self.button4.clicked.connect(lambda:self.whichButton(self.button4))
        layout.addWidget(self.button4)
        self.setLayout(layout)
        self.resize(400,300)
    def buttonState(self):
        if self.button1.isChecked():
            print('按钮1已经被选中')
        else:
            print('按钮1未被选中')
    def whichButton(self,btn):
        print('被单击的按钮是<' + btn.text() + '>')
if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QPushButtonDemo()
    main.show()
    sys.exit(app.exec_())

滑块控件（QSlider）

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
class QSliderDemo(QWidget):
    def __init__(self):
        super(QSliderDemo,self).__init__()
        self.initUI()
    def initUI(self):
        self.setWindowTitle('滑块控件演示')
        self.resize(300,700)
        layout = QVBoxLayout()
        self.label = QLabel('你好 PyQt5')
        self.label.setAlignment(Qt.AlignCenter)
        layout.addWidget(self.label)
        self.slider = QSlider(Qt.Horizontal)
        # 设置最小值
        self.slider.setMinimum(12)
        # 设置最大值
        self.slider.setMaximum(48)
        # 步长
        self.slider.setSingleStep(3)
        # 设置当前值
        self.slider.setValue(18)
        # 设置刻度的位置，刻度在下方
        self.slider.setTickPosition(QSlider.TicksBelow)
        # 设置刻度的间隔
        self.slider.setTickInterval(6)
        layout.addWidget(self.slider)
        self.slider.valueChanged.connect(self.valueChange)
        self.slider1 = QSlider(Qt.Vertical)
        layout.addWidget(self.slider1)
        # 设置最小值
        self.slider1.setMinimum(10)
        # 设置最大值
        self.slider1.setMaximum(60)
        # 步长
        self.slider1.setSingleStep(5)
        # 设置当前值
        self.slider1.setValue(30)
        # 设置刻度的位置，刻度在下方
        self.slider1.setTickPosition(QSlider.TicksLeft)
        # 设置刻度的间隔
        self.slider1.setTickInterval(2)
        self.slider1.valueChanged.connect(self.valueChange)
        self.setLayout(layout)
    def valueChange(self):
        print('当前值：%s' % self.sender().value())
        size = self.sender().value()
        self.label.setFont(QFont('Arial',size))
if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QSliderDemo()
    main.show()
    sys.exit(app.exec_())

QLabel与伙伴控件

mainLayout.addWidget(控件对象,rowIndex,columnIndex,row,column)

from PyQt5.QtWidgets import *
import sys
class QLabelBuddy(QDialog) :
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):
        self.setWindowTitle('QLabel与伙伴控件')
        nameLabel = QLabel('&Name',self)
        nameLineEdit = QLineEdit(self)
        # 设置伙伴控件
        nameLabel.setBuddy(nameLineEdit)
        passwordLabel = QLabel('&Password',self)
        passwordLineEdit = QLineEdit(self)
        # 设置伙伴控件
        passwordLabel.setBuddy(passwordLineEdit)
        btnOK = QPushButton('&OK')
        btnCancel = QPushButton('&Cancel')
        mainLayout = QGridLayout(self)
        mainLayout.addWidget(nameLabel,0,0)
        mainLayout.addWidget(nameLineEdit,0,1,1,2)
        mainLayout.addWidget(passwordLabel,1,0)
        mainLayout.addWidget(passwordLineEdit,1,1,1,2)
        mainLayout.addWidget(btnOK,2,1)
        mainLayout.addWidget(btnCancel,2,2)
if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QLabelBuddy()
    main.show()
    sys.exit(app.exec_())