https://www.cnblogs.com/feiyangqingyun/p/6035633.html
根据Qt的实现，在PyQt上面实现了滑动开关的控件
import sys from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import * class SwitchBtn(QWidget):
#信号
checkedChanged = pyqtSignal(bool)
def __init__(self,parent=None):
super(QWidget, self).__init__(parent) self.checked = False
self.bgColorOff = QColor(255, 255, 255)
self.bgColorOn = QColor(0, 0, 0) self.sliderColorOff = QColor(100, 100, 100)
self.sliderColorOn = QColor(100, 184, 255) self.textColorOff = QColor(143, 143, 143)
self.textColorOn = QColor(255, 255, 255) self.textOff = "OFF"
self.textOn = "ON" self.space = 2
self.rectRadius = 5 self.step = self.width() / 50
self.startX = 0
self.endX = 0 self.timer = QTimer(self) # 初始化一个定时器
self.timer.timeout.connect(self.updateValue) # 计时结束调用operate()方法 #self.timer.start(5) # 设置计时间隔并启动 self.setFont(QFont("Microsoft Yahei", 10)) #self.resize(55,22) def updateValue(self):
if self.checked:
if self.startX < self.endX:
self.startX = self.startX + self.step
else:
self.startX = self.endX
self.timer.stop()
else:
if self.startX > self.endX:
self.startX = self.startX - self.step
else:
self.startX = self.endX
self.timer.stop() self.update() def mousePressEvent(self,event):
self.checked = not self.checked
#发射信号
self.checkedChanged.emit(self.checked) # 每次移动的步长为宽度的50分之一
self.step = self.width() / 50
#状态切换改变后自动计算终点坐标
if self.checked:
self.endX = self.width() - self.height()
else:
self.endX = 0
self.timer.start(5) def paintEvent(self, evt):
#绘制准备工作, 启用反锯齿
painter = QPainter() painter.begin(self) painter.setRenderHint(QPainter.Antialiasing) #绘制背景
self.drawBg(evt, painter)
#绘制滑块
self.drawSlider(evt, painter)
#绘制文字
self.drawText(evt, painter) painter.end() def drawText(self, event, painter):
painter.save() if self.checked:
painter.setPen(self.textColorOn)
painter.drawText(0, 0, self.width() / 2 + self.space * 2, self.height(), Qt.AlignCenter, self.textOn)
else:
painter.setPen(self.textColorOff)
painter.drawText(self.width() / 2, 0,self.width() / 2 - self.space, self.height(), Qt.AlignCenter, self.textOff) painter.restore() def drawBg(self, event, painter):
painter.save()
painter.setPen(Qt.NoPen) if self.checked:
painter.setBrush(self.bgColorOn)
else:
painter.setBrush(self.bgColorOff) rect = QRect(0, 0, self.width(), self.height())
#半径为高度的一半
radius = rect.height() / 2
#圆的宽度为高度
circleWidth = rect.height() path = QPainterPath()
path.moveTo(radius, rect.left())
path.arcTo(QRectF(rect.left(), rect.top(), circleWidth, circleWidth), 90, 180)
path.lineTo(rect.width() - radius, rect.height())
path.arcTo(QRectF(rect.width() - rect.height(), rect.top(), circleWidth, circleWidth), 270, 180)
path.lineTo(radius, rect.top()) painter.drawPath(path)
painter.restore() def drawSlider(self, event, painter):
painter.save() if self.checked:
painter.setBrush(self.sliderColorOn)
else:
painter.setBrush(self.sliderColorOff) rect = QRect(0, 0, self.width(), self.height())
sliderWidth = rect.height() - self.space * 2
sliderRect = QRect(self.startX + self.space, self.space, sliderWidth, sliderWidth)
painter.drawEllipse(sliderRect) painter.restore() class MainWindow(QMainWindow):
def __init__(self,parent=None):
super(MainWindow, self).__init__(parent)
self.resize(400,200)
self.switchBtn = SwitchBtn(self)
self.switchBtn.setGeometry(10,10,60,30)
self.switchBtn.checkedChanged.connect(self.getState)
self.status = self.statusBar()
self.status.showMessage("this is a example", 5000)
self.setWindowTitle("PyQt") def getState(self,checked):
print("checked=", checked) if __name__ == "__main__":
app = QApplication(sys.argv)
form = MainWindow()
#form = SwitchBtn()
form.show()
sys.exit(app.exec_())