PyQt 5控件

PyQt 5控件包括：按钮、复选框、滑动条、列表框等

复选框QCheckBox

QCheckBox复选框控件，它有两个状态：打开和关闭，他是一个带有文本标签（Label）的控件。复选框常用于表示程序中可以启用或者禁用的功能。

cb = QCheckBox('show title',self)

# 创建一个复选框，标题命名为show title

cb.toggle()

# 切换复选框状态，复选框默认没有勾选，并且没有标题

 # Author:凌逆战
 # -*- coding:utf-8 -*-
 import sys
 from PyQt5.QtWidgets import QWidget, QCheckBox, QApplication
 from PyQt5.QtCore import Qt

 class Example(QWidget):
     def __init__(self):
         super().__init__()
         self.initUI()

     def initUI(self):
         cb = QCheckBox('Show title', self)  # 复选框自带的文本lable
         cb.move(20, 20)
         cb.toggle() # 切换状态# 勾选复选框
         # 复选框stateChanged状态改变信号绑定self.changeTitle槽
         cb.stateChanged.connect(self.changeTitle)

         self.setGeometry(300, 300, 250, 150)
         self.setWindowTitle('QCheckBox')
         self.show()

     def changeTitle(self, state):
         if state == Qt.Checked:
             self.setWindowTitle('QCheckBox')
         else:
             self.setWindowTitle('')

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

复选框

开关按钮Toggle button

ToggleButton是QPushButton的一种特殊模式

 # Author:凌逆战
 # -*- coding:utf-8 -*-
 import sys
 from PyQt5.QtWidgets import (QWidget, QPushButton,QFrame, QApplication)
 from PyQt5.QtGui import QColor

 class Example(QWidget):
     def __init__(self):
         super().__init__()
         self.initUI()

     def initUI(self):
         self.col = QColor(0, 0, 0)  # 初始黑颜色的值

         redb = QPushButton('Red', self) # 创建一个红色按钮
         redb.setCheckable(True) # 按钮设置成可检查的
         redb.move(10, 10)
         # 红色按钮点击信号和self.setColor槽连接在一起
         redb.clicked[bool].connect(self.setColor)

         greenb = QPushButton('Green', self) # 创建一个绿色按钮greenb
         greenb.setCheckable(True)   # 按钮设置成可以检查的
         greenb.move(10, 60)
         greenb.clicked[bool].connect(self.setColor)

         blueb = QPushButton('Blue', self)
         blueb.setCheckable(True)    # 通过setCheckable()方法得到一个ToggleButton
         blueb.move(10, 110)
         blueb.clicked[bool].connect(self.setColor)

         self.square = QFrame(self)
         self.square.setGeometry(150, 20, 100, 100)
         self.square.setStyleSheet("QWidget { background-color: %s }" %
                                   self.col.name())

         self.setGeometry(300, 300, 280, 170)
         self.setWindowTitle('Toggle button')
         self.show()

     def setColor(self, pressed):

         source = self.sender()  # 发送信号的人

         if pressed:
             val = 255
         else:
             val = 0

         if source.text() == "Red":
             self.col.setRed(val)
         elif source.text() == "Green":
             self.col.setGreen(val)
         else:
             self.col.setBlue(val)

         self.square.setStyleSheet("QFrame { background-color: %s }" %
                                   self.col.name())

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

开关按钮

滑动条QSlider

sld = QSlider(QT.Horizontal,self)

# 创建一个水平滑块

 # Author:凌逆战
 # -*- coding:utf-8 -*-
 import sys
 from PyQt5.QtWidgets import (QWidget, QSlider,QLabel, QApplication)
 from PyQt5.QtCore import Qt
 from PyQt5.QtGui import QPixmap

 class Example(QWidget):
     def __init__(self):
         super().__init__()
         self.initUI()

     def initUI(self):
         sld = QSlider(Qt.Horizontal, self)  # 水平的滑动条
         sld.setFocusPolicy(Qt.NoFocus)  # 设置焦点策略
         sld.setGeometry(30, 40, 100, 30)
         sld.valueChanged[int].connect(self.changeValue) # int传参

         self.label = QLabel(self)   # 创建一个QLable控件，并设置一个初始音量图标
         self.label.setPixmap(QPixmap('audio.ico'))
         self.label.setGeometry(160, 40, 80, 30)

         self.setGeometry(300, 300, 280, 170)
         self.setWindowTitle('QSlider')
         self.show()

     def changeValue(self, value):   # value形参

         if value == 0:
             self.label.setPixmap(QPixmap('audio.ico'))  # 设置像素映射
         elif value > 0 and value <= 30:
             self.label.setPixmap(QPixmap('min.ico'))
         elif value > 30 and value < 80:
             self.label.setPixmap(QPixmap('med.ico'))
         else:
             self.label.setPixmap(QPixmap('max.ico'))

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

滑动条

进度条QProgressBar

self.pbar = QProgressBar(self)

# 创建进度条实例

 # Author:凌逆战
 # -*- coding:utf-8 -*-
 import sys
 from PyQt5.QtWidgets import (QWidget, QProgressBar,QPushButton, QApplication)
 from PyQt5.QtCore import QBasicTimer

 class Example(QWidget):
     def __init__(self):
         super().__init__()
         self.initUI()

     def initUI(self):
         self.pbar = QProgressBar(self)  # 创建一个进度条QProgressBar实例
         self.pbar.setGeometry(30, 40, 200, 25)

         self.btn = QPushButton('Start', self)   # 创建一个Start按钮实例
         self.btn.move(40, 80)
         self.btn.clicked.connect(self.doAction)

         self.timer = QBasicTimer()  # 创建一个定时器实例，用来激活QProgressBar
         self.step = 0

         self.setGeometry(300, 300, 280, 170)
         self.setWindowTitle('进度条')
         self.show()
     # 每一个QObject及其子类都有一个timeEvent()事件处理器，
     # 重写timeEvrnt，实现这个事件处理器来响应定时器事件
     def timerEvent(self, e):

         if self.step >= 100:
             self.timer.stop()
             self.btn.setText('完成')
             return

         self.step = self.step + 1
         self.pbar.setValue(self.step)   # 把step的值设置为进度条的值

     def doAction(self):

         if self.timer.isActive():
             self.timer.stop()
             self.btn.setText('Start')
         else:
             # 调用start()方法来启动一个计时器
             # 第一个参数：超时；第二个参数:对象将接受的事件
             self.timer.start(100, self)
             self.btn.setText('Stop')

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

进度条

日历控件QCalendarWidget

cal = QCalendarWidget(self)

# 创建日历控件

cal.clicked[QDate].connect(self.showDate)

# 点击[QDate]发出信号，将信号clicked和self.showDate槽绑定

 # Author:凌逆战
 # -*- coding:utf-8 -*-
 import sys
 from PyQt5.QtWidgets import (QWidget, QCalendarWidget,QLabel, QApplication)
 from PyQt5.QtCore import QDate

 class Example(QWidget):
     def __init__(self):
         super().__init__()
         self.initUI()

     def initUI(self):
         cal = QCalendarWidget(self) # 创建一个日历控件QCalendarWidget
         cal.setGridVisible(True)    # 设置网格可视化
         cal.move(20, 20)
         cal.clicked[QDate].connect(self.showDate)

         self.lbl = QLabel(self)
         date = cal.selectedDate()
         self.lbl.setText(date.toString())   # 将data转换成字符串
         self.lbl.move(130, 260)

         self.setGeometry(300, 300, 350, 300)
         self.setWindowTitle('Calendar')
         self.show()

     def showDate(self, date):
         self.lbl.setText(date.toString())

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

日历控件