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 os

from PyQt4 import QtCore, QtGui

root_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_())