动画不更新

Question

我正在尝试重做这个 Qt 代码https://github.com/laserpants/qt-material-widgets但使用 Python 和 PyQt4 并且我遇到了动画问题。

我想重新创建示例的复选框，除动画外一切正常；它不更新。

主要问题是我想保留按钮的 stateMachine 和转换，但我找到的解决方案不使用它们。

我只希望图标在单击时淡入淡出

任何想法为什么这不起作用？

class materialCheckBox(QWidget):

    clicked = pyqtSignal()

    def __init__(self, parent):

        super(materialCheckBox,self).__init__(parent)

        self.setProperty("value", bool)

        checkedIcon = materialIcon(self, "C:/Users/User/.qgis2/python/plugins/Material/icons/baseline-check_box-24px.svg")

        uncheckedIcon = materialIcon(self, "C:/Users/User/.qgis2/python/plugins/Material/icons/baseline-check_box_outline_blank-24px.svg")

        self.stateMachine = QStateMachine()

        self.checkedState = QState()

        self.checkedState.assignProperty(self, "value", True)

        self.checkedState.assignProperty(checkedIcon, "opacity", 1.0)

        self.checkedState.assignProperty(uncheckedIcon, "opacity", 0.0)

        self.uncheckedState = QState()

        self.uncheckedState.assignProperty(self, "value", False)

        self.uncheckedState.assignProperty(checkedIcon, "opacity", 0.0)

        self.uncheckedState.assignProperty(uncheckedIcon, "opacity", 1.0)

        self.stateMachine.addState(self.checkedState)

        self.stateMachine.addState(self.uncheckedState)

        self.stateMachine.setInitialState(self.uncheckedState)

        transition1 = self.checkedState.addTransition(self.clicked, self.uncheckedState)

        animation1 = QPropertyAnimation(checkedIcon, "opacity", self)

        animation1.setDuration(2000)

        transition1.addAnimation(animation1)

        animation2 = QPropertyAnimation(uncheckedIcon, "opacity", self)

        animation2.setDuration(2000)

        transition1.addAnimation(animation2)

Answer 1

每次不透明度更改时都必须调用 update() 方法，因此创建 pyqtProperty 比创建动态属性更好：import osfrom PyQt4 import QtCore, QtGuiroot_path = os.path.dirname(os.path.realpath(__file__))icons_path = file = os.path.join(root_path, "icons")class MaterialCheckBox(QtGui.QWidget):    clicked = QtCore.pyqtSignal()    toggled = QtCore.pyqtSignal(bool)    def __init__(self, parent=None):        super(MaterialCheckBox, self).__init__(parent)        self._is_checked = False        checkedIcon = MaterialIcon(            self, os.path.join(icons_path, "baseline-check_box-24px.svg")        )        uncheckedIcon = MaterialIcon(            self,            os.path.join(                icons_path, "baseline-check_box_outline_blank-24px.svg"            ),        )        stateMachine = QtCore.QStateMachine(self)        checkedState = QtCore.QState()        checkedState.assignProperty(self, b"checked", True)        checkedState.assignProperty(checkedIcon, b"opacity", 1.0)        checkedState.assignProperty(uncheckedIcon, b"opacity", 0.0)        uncheckedState = QtCore.QState()        uncheckedState.assignProperty(self, b"checked", False)        uncheckedState.assignProperty(checkedIcon, b"opacity", 0.0)        uncheckedState.assignProperty(uncheckedIcon, b"opacity", 1.0)        stateMachine.addState(checkedState)        stateMachine.addState(uncheckedState)        stateMachine.setInitialState(uncheckedState)        duration = 2000        transition1 = checkedState.addTransition(self.clicked, uncheckedState)        animation1 = QtCore.QPropertyAnimation(            checkedIcon, b"opacity", self, duration=duration        )        transition1.addAnimation(animation1)        animation2 = QtCore.QPropertyAnimation(            uncheckedIcon, b"opacity", self, duration=duration        )        transition1.addAnimation(animation2)        transition2 = uncheckedState.addTransition(self.clicked, checkedState)        animation3 = QtCore.QPropertyAnimation(            checkedIcon, b"opacity", self, duration=duration        )        transition2.addAnimation(animation3)        animation4 = QtCore.QPropertyAnimation(            uncheckedIcon, b"opacity", self, duration=duration        )        transition2.addAnimation(animation4)        stateMachine.start()    def sizeHint(self):        return QtCore.QSize(24, 24)    def isChecked(self):        return self._is_checked    def setChecked(self, value):        if self._is_checked != value:            self._is_checked = value            self.toggled.emit(self._is_checked)    checked = QtCore.pyqtProperty(        bool, fget=isChecked, fset=setChecked, notify=toggled    )    def mousePressEvent(self, event):        self.clicked.emit()        self.update()        super(MaterialCheckBox, self).mousePressEvent(event)class MaterialIcon(QtGui.QWidget):    opacityChanged = QtCore.pyqtSignal()    def __init__(self, parent, address):        super(MaterialIcon, self).__init__(parent)        self.icon = QtGui.QPixmap(address)        self._opacity = 0.0    def opacity(self):        return self._opacity    def setOpacity(self, o):        if o != self._opacity:            self._opacity = o            self.opacityChanged.emit()            self.update()    opacity = QtCore.pyqtProperty(        float, fget=opacity, fset=setOpacity, notify=opacityChanged    )    def paintEvent(self, event):        painter = QtGui.QPainter(self)        painter.setOpacity(self.opacity)        mask = QtGui.QPainter(self.icon)        mask.setCompositionMode(QtGui.QPainter.CompositionMode_SourceIn)        mask.fillRect(self.icon.rect(), QtGui.QColor(0, 158, 227))        mask.end()        painter.drawPixmap(0, 0, self.icon)if __name__ == "__main__":    import sys    app = QtGui.QApplication(sys.argv)    w = MaterialCheckBox()    w.show()    sys.exit(app.exec_())