第四课 PyQt5按钮、滑块、计数器控件

tags:

python
网易云课堂

categories:

pyqt5
按钮控件
滑块控件
计数器控件

文章目录

第四课 PyQt5按钮、滑块、计数器控件

第一节按钮控件

1. 按钮控件分类
2. QPushButton按钮控件案例
3. QRadioButton单选按钮控件案例
3. QCheckBox复选框控件案例
4.下拉列表控件（QComboBox）

第二节滑块控件QSlider
第三节计数器控件QSpinBox

第一节按钮控件

1. 按钮控件分类

按钮控件的基类QAbstractButton
QPushButton（普通按钮）
AToolButton（工具条按钮）
QRadioButton（单选按钮）
QCheckBox（多选按钮）

2. QPushButton按钮控件案例

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')
        # 可复选
        self.button1.setCheckable(True)
        self.button1.toggle()
        self.button1.clicked.connect(self.buttonState)
        # 如果用上面的方法，不能给绑定的函数传参数。可以用lambda调用传参
        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)

        # 热键只在win下可用，mac下不支持热键
        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_())

3. QRadioButton单选按钮控件案例

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


class QRadioButtonDemo(QWidget):
    def __init__(self):
        super(QRadioButtonDemo, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('QRadioButton')
        layout = QHBoxLayout()
        self.button1 = QRadioButton('单选按钮1')
        self.button1.setChecked(True)

        self.button1.toggled.connect(self.buttonState)
        layout.addWidget(self.button1)

        self.button2 = QRadioButton('单选按钮2')
        self.button2.toggled.connect(self.buttonState)
        layout.addWidget(self.button2)
        self.setLayout(layout)

    def buttonState(self):
        radioButton = self.sender()
        if radioButton.isChecked() == True:
            print('<' + radioButton.text() + '> 被选中')
        else:
            print('<' + radioButton.text() + '> 被取消选中状态')


if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QRadioButtonDemo()
    main.show()
    sys.exit(app.exec_())

3. QCheckBox复选框控件案例

复选框控件(QCheckBox)有3种状态:未选中：0、半选中：1、选中：2
这里setTristate(True)只有设为真才有可能处于半选中状态

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


class QCheckBoxDemo(QWidget):
    def __init__(self):
        super(QCheckBoxDemo, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('复选框控件演示')

        layout = QHBoxLayout()

        self.checkBox1 = QCheckBox('复选框控件1')
        self.checkBox1.setChecked(True)
        self.checkBox1.stateChanged.connect(lambda: self.checkboxState(self.checkBox1))
        layout.addWidget(self.checkBox1)

        self.checkBox2 = QCheckBox('复选框控件2')
        self.checkBox2.stateChanged.connect(lambda: self.checkboxState(self.checkBox2))
        layout.addWidget(self.checkBox2)

        self.checkBox3 = QCheckBox('半选中')
        self.checkBox3.stateChanged.connect(lambda: self.checkboxState(self.checkBox3))
        # 这里只有设为真才有可能处于半选中状态
        self.checkBox3.setTristate(True)
        self.checkBox3.setCheckState(Qt.PartiallyChecked)
        layout.addWidget(self.checkBox3)

        self.setLayout(layout)

    def checkboxState(self, cb):
        check1Status = self.checkBox1.text() + ', isChecked=' + str(self.checkBox1.isChecked()) + ',checkState=' + str(
            self.checkBox1.checkState()) + '\n'
        check2Status = self.checkBox2.text() + ', isChecked=' + str(self.checkBox2.isChecked()) + ',checkState=' + str(
            self.checkBox2.checkState()) + '\n'
        check3Status = self.checkBox3.text() + ', isChecked=' + str(self.checkBox3.isChecked()) + ',checkState=' + str(
            self.checkBox3.checkState()) + '\n'
        print(check1Status + check2Status + check3Status)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QCheckBoxDemo()
    main.show()
    sys.exit(app.exec_())

4.下拉列表控件（QComboBox）

如何将列表项添加到QComboBox控件中
如何获取选中的列表项

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


class QComboBoxDemo(QWidget):
    def __init__(self):
        super(QComboBoxDemo, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('下拉列表控件演示')
        self.resize(300, 100)

        layout = QVBoxLayout()

        self.label = QLabel('请选择编程语言')

        self.cb = QComboBox()
        self.cb.addItem('C++')
        self.cb.addItem('Python')
        # 添加多个
        self.cb.addItems(['Java', 'C#', 'Ruby'])

        self.cb.currentIndexChanged.connect(self.selectionChange)

        layout.addWidget(self.label)
        layout.addWidget(self.cb)

        self.setLayout(layout)

    def selectionChange(self, i):
        self.label.setText(self.cb.currentText())
        self.label.adjustSize()

        for count in range(self.cb.count()):
            print('item' + str(count) + '=' + self.cb.itemText(count))

        print('current index', i, 'selection changed', self.cb.currentText())


if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QComboBoxDemo()
    main.show()
    sys.exit(app.exec_())

第二节滑块控件QSlider

'''

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_())

第三节计数器控件QSpinBox

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


class QSpinBoxDemo(QWidget):
    def __init__(self):
        super(QSpinBoxDemo, self).__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('QSpinBox演示')
        self.resize(300, 100)

        layout = QVBoxLayout()
        self.label = QLabel('当前值')
        self.label.setAlignment(Qt.AlignCenter)

        layout.addWidget(self.label)

        self.sb = QSpinBox()
        self.sb.setValue(18)
        self.sb.setRange(10, 38)
        self.sb.setSingleStep(3)
        layout.addWidget(self.sb)
        self.sb.valueChanged.connect(self.valueChange)
        self.setLayout(layout)

    def valueChange(self):
        self.label.setText('当前值：' + str(self.sb.value()))


if __name__ == '__main__':
    app = QApplication(sys.argv)
    main = QSpinBoxDemo()
    main.show()
    sys.exit(app.exec_())

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第四课 PyQt5按钮、滑块、计数器控件

第四课 PyQt5按钮、滑块、计数器控件

文章目录

第一节 按钮控件

1. 按钮控件分类

2. QPushButton按钮控件案例

3. QRadioButton单选按钮控件案例

3. QCheckBox复选框控件案例

4.下拉列表控件（QComboBox）

第二节 滑块控件QSlider

第三节 计数器控件QSpinBox

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第一节按钮控件

第二节滑块控件QSlider

第三节计数器控件QSpinBox