python - 调用 setSizes() 方法时如何为拆分器设置动画？

Question

我的 Qt5 GUI 中有 QSplitter 小部件，并且有两个子小部件添加到该拆分器。并且有一个 QPushButton 小部件，当按下该按钮时，第二个子部件消失，当再次按下该按钮时，该子部件出现。但我想要展开和折叠那个子部件。但我不知道如何在拆分器小部件上调用“setSizes()”时为事件设置动画。

谁能给我提供 pyqt5 中的代码？

这是我的代码

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(QtWidgets.QMainWindow):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(400, 300)
        self.centralWidget = QtWidgets.QWidget(MainWindow)
        self.centralWidget.setObjectName("centralWidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralWidget)
        self.verticalLayout.setContentsMargins(11, 11, 11, 11)
        self.verticalLayout.setSpacing(6)
        self.verticalLayout.setObjectName("verticalLayout")

        self.pushButton = QtWidgets.QPushButton(self.centralWidget)
        self.pushButton.setObjectName("pushButton")
        self.pushButton.clicked.connect(self.splitter_resize)
        self.pushButton.setCheckable(True)

        self.verticalLayout.addWidget(self.pushButton)

        self.horizontalLayout = QtWidgets.QHBoxLayout()
        self.horizontalLayout.setSpacing(6)
        self.horizontalLayout.setObjectName("horizontalLayout")

        self.pushButton_2 = QtWidgets.QPushButton(self.centralWidget)
        self.pushButton_2.setObjectName("pushButton_2")

        self.pushButton_3 = QtWidgets.QPushButton(self.centralWidget)
        self.pushButton_3.setObjectName("pushButton_3")

        self.splitter = QtWidgets.QSplitter()
        self.splitter.setOrientation(QtCore.Qt.Horizontal)
        self.splitter.addWidget(self.pushButton_2)
        self.splitter.addWidget(self.pushButton_3)

        self.horizontalLayout.addWidget(self.splitter)

        self.verticalLayout.addLayout(self.horizontalLayout)
        MainWindow.setCentralWidget(self.centralWidget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def splitter_resize(self):
        if self.pushButton.isChecked():
            self.splitter.setSizes([16777215, 0])
            self.pushButton.setChecked = False
        else:
            self.splitter.setSizes([16777215, 16777215])
            self.pushButton.setChecked = True

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))
        self.pushButton_2.setText(_translate("MainWindow", "PushButton"))
        self.pushButton_3.setText(_translate("MainWindow", "PushButton"))

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

Answer 1

您可以使用 QVariantAnimation:

from PyQt5 import QtCore, QtGui, QtWidgets


MIN_SIZE, MAX_SIZE = 0, 16777215


class MainWindow(QtWidgets.QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        button = QtWidgets.QPushButton(
            "Press me", checkable=True, toggled=self.onToggled
        )
        left_button = QtWidgets.QPushButton("Left")
        right_button = QtWidgets.QPushButton("Right")

        sp = right_button.sizePolicy()
        sp.setHorizontalPolicy(QtWidgets.QSizePolicy.Ignored)
        right_button.setSizePolicy(sp)

        self.m_splitter = QtWidgets.QSplitter(orientation=QtCore.Qt.Horizontal)
        self.m_splitter.addWidget(left_button)
        self.m_splitter.addWidget(right_button)

        widget = QtWidgets.QWidget()
        self.setCentralWidget(widget)

        lay = QtWidgets.QVBoxLayout(widget)
        lay.addWidget(button)
        lay.addWidget(self.m_splitter)

        self.m_animation = QtCore.QVariantAnimation(
            self,
            startValue=MAX_SIZE,
            endValue=MIN_SIZE,
            valueChanged=self.onValueChanged,
            duration=1000,
            easingCurve=QtCore.QEasingCurve.InOutCubic,
        )

    @QtCore.pyqtSlot(bool)
    def onToggled(self, checked):
        self.m_animation.setDirection(
            QtCore.QAbstractAnimation.Forward
            if checked
            else QtCore.QAbstractAnimation.Backward
        )
        self.m_animation.start()

    @QtCore.pyqtSlot(QtCore.QVariant)
    def onValueChanged(self, value):
        s = [MAX_SIZE, value]
        self.m_splitter.setSizes(s)


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.resize(640, 480)
    w.show()
    sys.exit(app.exec_())