通过Qt学PyQt:派生对话框

#_*_ coding: utf-8 _*_from PyQt4.QtCore import *from PyQt4.QtGui import *import sysQTextCodec.setCodecForTr(QTextCodec.codecForName("utf8"))class FindDialog(QDialog):    def __init__(self,parent = None):        super(FindDialog, self).__init__(parent)        self.setWindowTitle(self.tr("Find"))                # QLabel控件中显示的图像和文字的位置可以用setAlignment和setIndent方法调整。文字内容也可以用setWordWrap方法分成几行。        label = QLabel(self.tr("Find &what:"))        lineEdit = QLineEdit()        # setBuddy方法可以将QLabel控件与QLineEdit控件联系起来，从而将键盘焦点转移到QLineEdit控件上        label.setBuddy(lineEdit)        caseCheckBox = QCheckBox(self.tr("Match &case"))        backwardCheckBox = QCheckBox(self.tr("Search &backward"))        self.findButton = QPushButton(self.tr("&Find"))        self.findButton.setDefault(True)        self.findButton.setEnabled(False)                closeButton = QPushButton(self.tr("Close"))                QObject.connect(lineEdit,SIGNAL("textChanged(const QString &)"),self.enableFindButton)        QObject.connect(self.findButton, SIGNAL("clicked()"), self.findClicked)        QObject.connect(closeButton, SIGNAL("clicked()"), self, SLOT("close()"))                topLeftLayout = QHBoxLayout()        topLeftLayout.addWidget(label)        topLeftLayout.addWidget(lineEdit)                leftLayout = QVBoxLayout()        leftLayout.addLayout(topLeftLayout)        leftLayout.addWidget(caseCheckBox)        leftLayout.addWidget(backwardCheckBox)                rightLayout = QVBoxLayout()        rightLayout.addWidget(self.findButton)        rightLayout.addWidget(closeButton)        rightLayout.addStretch()                mainLayout = QHBoxLayout()        mainLayout.addLayout(leftLayout)        mainLayout.addLayout(rightLayout)        self.setLayout(mainLayout)                self.setFixedHeight(self.sizeHint().height())                # 自定义TAB键的顺序，只两个参数不方便        # QWidget.setTabOrder(closeButton,self.findButton)        # QWidget.setTabOrder(self.findButton,backwardCheckBox)            def findNext(str,cs):        pass    def findPrevious(str,cs):        pass    def findClicked(self):        text = lineEdit.text()        if caseCheckBox.isChecked():            cs = Qt.CaseSensitive        else:            cs = Qt.CaseInsensitive        if backwardCheckBox.isChecked():            self.findPrevious.emit(text,cs)        else:            self.findNext.emit(text,cs)            def enableFindButton(self, text):        self.findButton.setEnabled(not text.isEmpty())app = QApplication(sys.argv)aaa = FindDialog()aaa.show()app.exec_()    # 测试ALT+W, ALT+C, ALT+B, ALT+F, 默认的TAB键是控制创建的顺序# QWidget::setTabOrder()可以改变这个顺序 # connect(lineEdit, SIGNAL(textChanged(const QString &)),this, SIGNAL(updateRecord(const QString &)))；