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from PySide2.QtGui import *

//! [0]
def __init__(self, parent):
    QDialog.__init__(self, parent)
    label = QLabel(self.tr("Find &what:"))
    lineEdit = QLineEdit()
    label.setBuddy(lineEdit)

    caseCheckBox = QCheckBox(self.tr("Match &case"))
    fromStartCheckBox = QCheckBox(self.tr("Search from &start"))
    fromStartCheckBox.setChecked(True)

//! [1]
    findButton = QPushButton(self.tr("&Find"))
    findButton.setDefault(True)

    moreButton = QPushButton(self.tr("&More"))
    moreButton.setCheckable(True)
//! [0]
    moreButton.setAutoDefault(False)

    buttonBox = QDialogButtonBox(Qt.Vertical)
    buttonBox.addButton(findButton, QDialogButtonBox.ActionRole)
    buttonBox.addButton(moreButton, QDialogButtonBox.ActionRole)
//! [1]

//! [2]
    extension = QWidget()

    wholeWordsCheckBox =  QCheckBox(self.tr("&Whole words"))
    backwardCheckBox =  QCheckBox(self.tr("Search &backward"))
    searchSelectionCheckBox =  QCheckBox(self.tr("Search se&lection"))
//! [2]

//! [3]
    moreButton.toggled[bool].connect(extension.setVisible)

    extensionLayout =  QVBoxLayout()
    extensionLayout.setMargin(0)
    extensionLayout.addWidget(wholeWordsCheckBox)
    extensionLayout.addWidget(backwardCheckBox)
    extensionLayout.addWidget(searchSelectionCheckBox)
    extension.setLayout(extensionLayout)
//! [3]

//! [4]
    topLeftLayout = QHBoxLayout()
    topLeftLayout.addWidget(label)
    topLeftLayout.addWidget(lineEdit)

    leftLayout = QVBoxLayout()
    leftLayout.addLayout(topLeftLayout)
    leftLayout.addWidget(caseCheckBox)
    leftLayout.addWidget(fromStartCheckBox)
    leftLayout.addSself.tretch(1)

    mainLayout = QGridLayout()
    mainLayout.setSizeConsself.traint(QLayout.SetFixedSize)
    mainLayout.addLayout(leftLayout, 0, 0)
    mainLayout.addWidget(buttonBox, 0, 1)
    mainLayout.addWidget(extension, 1, 0, 1, 2)
    setLayout(mainLayout)

    setWindowTitle(self.tr("Extension"))
//! [4] //! [5]
    extension.hide()
//! [5]
