在PyQt中切換按鈕

Question

我已經在PyQt4中實現了下面的切換按鈕，但我無法理解爲什麼它在「OFF」狀態時沒有像預期那樣工作。我無法理解似乎是什麼問題。任何幫助將是有價值的和高度讚賞。

因此，您可以找到我的代碼。

from PyQt4.QtCore import QObject 
from PyQt4.QtGui import QPen 
from PyQt4.QtGui import QBrush 
from PyQt4.QtGui import QPalette 
from PyQt4.QtGui import QAbstractButton 
from PyQt4.QtGui import QPainter 
from PyQt4.QtGui import QApplication 
from PyQt4.QtCore import QRectF 
from PyQt4.QtGui import QLinearGradient, QGradient 
from PyQt4.QtCore import QPropertyAnimation 
from PyQt4.QtCore import QEasingCurve 
from PyQt4.QtCore import Qt, QSize 
from PyQt4.QtCore import pyqtProperty, pyqtSlot 


class QSlideSwitchPrivate(QObject): 

    def __init__(self, q): 
     QObject.__init__(self) 

     self._position = 0 
     self._sliderShape = QRectF() 
     self._gradient = QLinearGradient() 
     self._gradient.setSpread(QGradient.PadSpread) 
     self._qPointer = q 

     self.animation = QPropertyAnimation(self) 
     self.animation.setTargetObject(self) 
     self.animation.setPropertyName("position") 
     self.animation.setStartValue(0) 
     self.animation.setEndValue(1) 
     self.animation.setDuration(300) 
     self.animation.setEasingCurve(QEasingCurve.InOutExpo) 

    def __del__(self): 
     del self.animation 

    @pyqtProperty(float) 
    def position(self): 
     return self._position 

    @position.setter 
    def position(self, value): 
     self._position = value 
     self._qPointer.repaint() 

    def drawSlider(self, painter): 
     margin = 3 
     r = self._qPointer.rect().adjusted(0,0,-1,-1) 
     dx = (r.width() - self._sliderShape.width()) * self._position 
     sliderRect = self._sliderShape.translated(dx, 0) 
     painter.setPen(Qt.NoPen) 

     # basic settings 
     shadow = self._qPointer.palette().color(QPalette.Dark) 
     light = self._qPointer.palette().color(QPalette.Light) 
     button = self._qPointer.palette().color(QPalette.Button) 

     # draw background 
     # draw outer background 
     self._gradient.setColorAt(0, shadow.darker(130)) 
     self._gradient.setColorAt(1, light.darker(130)) 
     self._gradient.setStart(0, r.height()) 
     self._gradient.setFinalStop(0, 0) 
     painter.setBrush(self._gradient) 
     painter.drawRoundedRect(r, 15, 15) 

     # draw background 
     # draw inner background 
     self._gradient.setColorAt(0, shadow.darker(140)) 
     self._gradient.setColorAt(1, light.darker(160)) 
     self._gradient.setStart(0, 0) 
     self._gradient.setFinalStop(0, r.height()) 
     painter.setBrush(self._gradient) 
     painter.drawRoundedRect(r.adjusted(margin, margin, -margin, -margin), 15, 15) 

     # draw slider 
     self._gradient.setColorAt(0, button.darker(130)) 
     self._gradient.setColorAt(1, button) 

     # draw outer slider 
     self._gradient.setStart(0, r.height()) 
     self._gradient.setFinalStop(0, 0) 
     painter.setBrush(self._gradient) 
     painter.drawRoundedRect(sliderRect.adjusted(margin, margin, -margin, -margin), 10, 15) 

     # draw inner slider 
     self._gradient.setStart(0, 0) 
     self._gradient.setFinalStop(0, r.height()) 
     painter.setBrush(self._gradient) 
     painter.drawRoundedRect(sliderRect.adjusted(2.5 * margin, 2.5 * margin, -2.5 * margin, - 2.5 * margin), 5, 15) 

     # draw text 
     if self.animation.state() == QPropertyAnimation.Running: 
      return #don't draw any text while animation is running 

     font = self._qPointer.font() 
     self._gradient.setColorAt(0, light) 
     self._gradient.setColorAt(1, shadow) 
     self._gradient.setStart(0, r.height()/2.0 + font.pointSizeF()) 
     self._gradient.setFinalStop(0, r.height()/2.0 - font.pointSizeF()) 
     painter.setFont(font) 
     painter.setPen(QPen(QBrush(self._gradient), 0)) 

     if self._qPointer.isChecked(): 
      painter.drawText(0, 0, r.width()/2, r.height()-1, Qt.AlignCenter, "ON") 
     else: 
      painter.drawText(r.width()/2, 0, r.width()/2, r.height() - 1, Qt.AlignCenter, "OFF") 

    def updateSliderRect(self, size): 
     self._sliderShape.setWidth(size.width()/2.0) 
     self._sliderShape.setHeight(size.height() - 1.0) 

    @pyqtSlot(bool, name='animate') 
    def animate(self, checked): 
     self.animation.setDirection = QPropertyAnimation.Forward if checked else QPropertyAnimation.Backward 
     print(self.animation.setDirection) 
     self.animation.start() 


class QSlideSwitch(QAbstractButton): 
    def __init__(self, parent = None): 
     super(QAbstractButton, self).__init__(parent) 

     self.d_ptr = QSlideSwitchPrivate(self) 
     self.clicked.connect(self.d_ptr.animate) 
     self.d_ptr.animation.finished.connect(self.update) 

    def __del__(self): 
     del self.d_ptr 

    def sizeHint(self): 
     return QSize(48, 28) 

    def hitButton(self, point): 
     return self.rect().contains(point) 

    def paintEvent(self, event): 
     painter = QPainter(self) 
     painter.setRenderHint(QPainter.Antialiasing) 
     self.d_ptr.drawSlider(painter) 

    def resizeEvent(self, event): 
     self.d_ptr.updateSliderRect(event.size()) 
     self.repaint() 


if __name__ == '__main__': 

    import sys 

    app = QApplication(sys.argv) 

    switcher = QSlideSwitch() 
    switcher.setCheckable(True) 
    switcher.show() 

    sys.exit(app.exec_()) 

Answer 1

問題是您沒有更改QPropertyAnimation的地址。您不能使用{your QPropertyAnimation}.setDirection = {some value}，但{your QPropertyAnimation}.setDirection({some value})。您必須更改爲

@pyqtSlot(bool, name='animate') 
def animate(self, checked): 
    self.animation.setDirection(QPropertyAnimation.Forward if checked else QPropertyAnimation.Backward) 
    self.animation.start()