python3+PyQt5+Qt Designer实现扩展对话框

本文是对《Python Qt GUI快速编程》的第9章的扩展对话框例子Find and replace用Python3+PyQt5+Qt Designer进行改写。
第一部分无借用Qt Designer，完全用代码实现。
第二部分则借用Qt Designer，快速实现。

---

第一部分：

import sys
from PyQt5.QtCore import Qt,pyqtSignal
from PyQt5.QtWidgets import (QApplication, QCheckBox, QDialog, QFrame,
        QGridLayout, QHBoxLayout, QLabel, QLayout, QLineEdit,
        QPushButton, QVBoxLayout)



class FindAndReplaceDlg(QDialog):
    find = pyqtSignal(str,bool,bool,bool,bool,bool)
    replace = pyqtSignal(str,str,bool,bool,bool,bool,bool)      

    def __init__(self, parent=None):
        super(FindAndReplaceDlg, self).__init__(parent)

        findLabel = QLabel("Find &what:")
        self.findLineEdit = QLineEdit()
        findLabel.setBuddy(self.findLineEdit)
        replaceLabel = QLabel("Replace w&ith:")
        self.replaceLineEdit = QLineEdit()
        replaceLabel.setBuddy(self.replaceLineEdit)
        self.caseCheckBox = QCheckBox("&Case sensitive")
        self.wholeCheckBox = QCheckBox("Wh&ole words")
        self.wholeCheckBox.setChecked(True)
        self.moreFrame = QFrame()
        self.moreFrame.setFrameStyle(QFrame.StyledPanel|QFrame.Sunken)
        self.backwardsCheckBox = QCheckBox("Search &Backwards")
        self.regexCheckBox = QCheckBox("Regular E&xpression")
        self.ignoreNotesCheckBox = QCheckBox("Ignore foot¬es "
                                                   "and endnotes")
        line = QFrame()
        line.setFrameStyle(QFrame.VLine|QFrame.Sunken)
        self.findButton = QPushButton("&Find")
        self.replaceButton = QPushButton("&Replace")
        closeButton = QPushButton("Close")
        self.moreButton = QPushButton("&More")
        self.moreButton.setCheckable(True)


        gridLayout = QGridLayout()
        gridLayout.addWidget(findLabel, 0, 0)
        gridLayout.addWidget(self.findLineEdit, 0, 1)
        gridLayout.addWidget(replaceLabel, 1, 0)
        gridLayout.addWidget(self.replaceLineEdit, 1, 1)
        frameLayout = QVBoxLayout()
        frameLayout.addWidget(self.backwardsCheckBox)
        frameLayout.addWidget(self.regexCheckBox)
        frameLayout.addWidget(self.ignoreNotesCheckBox)
        self.moreFrame.setLayout(frameLayout)
        leftLayout = QVBoxLayout()
        leftLayout.addLayout(gridLayout)
        leftLayout.addWidget(self.caseCheckBox)
        leftLayout.addWidget(self.wholeCheckBox)
        leftLayout.addWidget(self.moreFrame)
        buttonLayout = QVBoxLayout()
        buttonLayout.addWidget(self.findButton)
        buttonLayout.addWidget(self.replaceButton)
        buttonLayout.addWidget(closeButton)
        buttonLayout.addWidget(self.moreButton)
        buttonLayout.addStretch()
        mainLayout = QHBoxLayout()
        mainLayout.addLayout(leftLayout)
        mainLayout.addWidget(line)
        mainLayout.addLayout(buttonLayout)
        self.setLayout(mainLayout)

        self.moreFrame.hide()
        mainLayout.setSizeConstraint(QLayout.SetFixedSize)

        self.moreButton.toggled[bool].connect(self.setvisible)


        self.findLineEdit.textEdited.connect(self.updateUi)
        self.findButton.clicked.connect(self.findClicked)
        self.replaceButton.clicked.connect(self.replaceClicked)

        self.updateUi()
        self.setWindowTitle("Find and Replace")

    def setvisible(self,YN):
        self.moreFrame.setVisible(YN)


    def findClicked(self):
        self.find.emit(self.findLineEdit.text(),
                self.caseCheckBox.isChecked(),
                self.wholeCheckBox.isChecked(),
                self.backwardsCheckBox.isChecked(),
                self.regexCheckBox.isChecked(),
                self.ignoreNotesCheckBox.isChecked())


    def replaceClicked(self):
        self.replace.emit(self.findLineEdit.text(),
                self.replaceLineEdit.text(),
                self.caseCheckBox.isChecked(),
                self.wholeCheckBox.isChecked(),
                self.backwardsCheckBox.isChecked(),
                self.regexCheckBox.isChecked(),
                self.ignoreNotesCheckBox.isChecked())


    def updateUi(self):
        enable = self.findLineEdit.text()
        self.findButton.setEnabled(bool(enable))
        self.replaceButton.setEnabled(bool(enable))


if __name__ == "__main__":

    def find(what, *args):
        print("Find {0} {1}".format(what, [x for x in args]))

    def replace(old, new, *args):
        print("Replace {0} with {1} {2}".format(
              old, new, [x for x in args]))

    app = QApplication(sys.argv)
    form = FindAndReplaceDlg()
    form.find.connect(find)
    form.replace.connect(replace)        
    form.show()
    app.exec_()

第二部分：

/home/yrd/eric_workspace/chap09/findandreplacedlg/Ui_findandreplacedlg.py

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file '/home/yrd/eric_workspace/chap09/findandreplacedlg/findandreplacedlg.ui'
#
# Created by: PyQt5 UI code generator 5.7
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_FindAndReplaceDlg(object):
    def setupUi(self, FindAndReplaceDlg):
        FindAndReplaceDlg.setObjectName("FindAndReplaceDlg")
        FindAndReplaceDlg.resize(355, 274)
        self.mainlayout = QtWidgets.QHBoxLayout(FindAndReplaceDlg)
        self.mainlayout.setSizeConstraint(QtWidgets.QLayout.SetFixedSize)
        self.mainlayout.setContentsMargins(9, 9, 9, 9)
        self.mainlayout.setSpacing(6)
        self.mainlayout.setObjectName("mainlayout")
        self.vboxlayout = QtWidgets.QVBoxLayout()
        self.vboxlayout.setContentsMargins(0, 0, 0, 0)
        self.vboxlayout.setSpacing(6)
        self.vboxlayout.setObjectName("vboxlayout")
        self.gridlayout = QtWidgets.QGridLayout()
        self.gridlayout.setContentsMargins(0, 0, 0, 0)
        self.gridlayout.setSpacing(6)
        self.gridlayout.setObjectName("gridlayout")
        self.replaceLineEdit = QtWidgets.QLineEdit(FindAndReplaceDlg)
        self.replaceLineEdit.setObjectName("replaceLineEdit")
        self.gridlayout.addWidget(self.replaceLineEdit, 1, 1, 1, 1)
        self.findLineEdit = QtWidgets.QLineEdit(FindAndReplaceDlg)
        self.findLineEdit.setObjectName("findLineEdit")
        self.gridlayout.addWidget(self.findLineEdit, 0, 1, 1, 1)
        self.label_2 = QtWidgets.QLabel(FindAndReplaceDlg)
        self.label_2.setObjectName("label_2")
        self.gridlayout.addWidget(self.label_2, 1, 0, 1, 1)
        self.label = QtWidgets.QLabel(FindAndReplaceDlg)
        self.label.setObjectName("label")
        self.gridlayout.addWidget(self.label, 0, 0, 1, 1)
        self.vboxlayout.addLayout(self.gridlayout)
        self.vboxlayout1 = QtWidgets.QVBoxLayout()
        self.vboxlayout1.setContentsMargins(0, 0, 0, 0)
        self.vboxlayout1.setSpacing(6)
        self.vboxlayout1.setObjectName("vboxlayout1")
        self.caseCheckBox = QtWidgets.QCheckBox(FindAndReplaceDlg)
        self.caseCheckBox.setObjectName("caseCheckBox")
        self.vboxlayout1.addWidget(self.caseCheckBox)
        self.wholeCheckBox = QtWidgets.QCheckBox(FindAndReplaceDlg)
        self.wholeCheckBox.setChecked(True)
        self.wholeCheckBox.setObjectName("wholeCheckBox")
        self.vboxlayout1.addWidget(self.wholeCheckBox)
        self.vboxlayout.addLayout(self.vboxlayout1)
        spacerItem = QtWidgets.QSpacerItem(231, 16, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
        self.vboxlayout.addItem(spacerItem)
        self.moreFrame = QtWidgets.QFrame(FindAndReplaceDlg)
        self.moreFrame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.moreFrame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.moreFrame.setObjectName("moreFrame")
        self.vboxlayout2 = QtWidgets.QVBoxLayout(self.moreFrame)
        self.vboxlayout2.setContentsMargins(9, 9, 9, 9)
        self.vboxlayout2.setSpacing(6)
        self.vboxlayout2.setObjectName("vboxlayout2")
        self.backwardsCheckBox = QtWidgets.QCheckBox(self.moreFrame)
        self.backwardsCheckBox.setObjectName("backwardsCheckBox")
        self.vboxlayout2.addWidget(self.backwardsCheckBox)
        self.regexCheckBox = QtWidgets.QCheckBox(self.moreFrame)
        self.regexCheckBox.setObjectName("regexCheckBox")
        self.vboxlayout2.addWidget(self.regexCheckBox)
        self.ignoreNotesCheckBox = QtWidgets.QCheckBox(self.moreFrame)
        self.ignoreNotesCheckBox.setObjectName("ignoreNotesCheckBox")
        self.vboxlayout2.addWidget(self.ignoreNotesCheckBox)
        self.vboxlayout.addWidget(self.moreFrame)
        self.mainlayout.addLayout(self.vboxlayout)
        self.line = QtWidgets.QFrame(FindAndReplaceDlg)
        self.line.setFrameShape(QtWidgets.QFrame.VLine)
        self.line.setFrameShadow(QtWidgets.QFrame.Sunken)
        self.line.setObjectName("line")
        self.mainlayout.addWidget(self.line)
        self.vboxlayout3 = QtWidgets.QVBoxLayout()
        self.vboxlayout3.setContentsMargins(0, 0, 0, 0)
        self.vboxlayout3.setSpacing(6)
        self.vboxlayout3.setObjectName("vboxlayout3")
        self.findButton = QtWidgets.QPushButton(FindAndReplaceDlg)
        self.findButton.setFocusPolicy(QtCore.Qt.NoFocus)
        self.findButton.setObjectName("findButton")
        self.vboxlayout3.addWidget(self.findButton)
        self.replaceButton = QtWidgets.QPushButton(FindAndReplaceDlg)
        self.replaceButton.setFocusPolicy(QtCore.Qt.NoFocus)
        self.replaceButton.setObjectName("replaceButton")
        self.vboxlayout3.addWidget(self.replaceButton)
        self.closeButton = QtWidgets.QPushButton(FindAndReplaceDlg)
        self.closeButton.setFocusPolicy(QtCore.Qt.NoFocus)
        self.closeButton.setObjectName("closeButton")
        self.vboxlayout3.addWidget(self.closeButton)
        self.moreButton = QtWidgets.QPushButton(FindAndReplaceDlg)
        self.moreButton.setFocusPolicy(QtCore.Qt.NoFocus)
        self.moreButton.setCheckable(True)
        self.moreButton.setObjectName("moreButton")
        self.vboxlayout3.addWidget(self.moreButton)
        spacerItem1 = QtWidgets.QSpacerItem(21, 16, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
        self.vboxlayout3.addItem(spacerItem1)
        self.mainlayout.addLayout(self.vboxlayout3)
        self.label_2.setBuddy(self.replaceLineEdit)
        self.label.setBuddy(self.findLineEdit)

        self.retranslateUi(FindAndReplaceDlg)
        self.closeButton.clicked.connect(FindAndReplaceDlg.reject)
        self.moreButton.toggled['bool'].connect(self.moreFrame.setVisible)
        QtCore.QMetaObject.connectSlotsByName(FindAndReplaceDlg)
        FindAndReplaceDlg.setTabOrder(self.findLineEdit, self.replaceLineEdit)
        FindAndReplaceDlg.setTabOrder(self.replaceLineEdit, self.caseCheckBox)
        FindAndReplaceDlg.setTabOrder(self.caseCheckBox, self.wholeCheckBox)
        FindAndReplaceDlg.setTabOrder(self.wholeCheckBox, self.backwardsCheckBox)
        FindAndReplaceDlg.setTabOrder(self.backwardsCheckBox, self.regexCheckBox)
        FindAndReplaceDlg.setTabOrder(self.regexCheckBox, self.ignoreNotesCheckBox)

    def retranslateUi(self, FindAndReplaceDlg):
        _translate = QtCore.QCoreApplication.translate
        FindAndReplaceDlg.setWindowTitle(_translate("FindAndReplaceDlg", "Find and Replace"))
        self.label_2.setText(_translate("FindAndReplaceDlg", "Replace w&ith:"))
        self.label.setText(_translate("FindAndReplaceDlg", "Find &what:"))
        self.caseCheckBox.setText(_translate("FindAndReplaceDlg", "&Case sensitive"))
        self.wholeCheckBox.setText(_translate("FindAndReplaceDlg", "Wh&ole words"))
        self.backwardsCheckBox.setText(_translate("FindAndReplaceDlg", "Search &Backwards"))
        self.regexCheckBox.setText(_translate("FindAndReplaceDlg", "Regular E&xpression"))
        self.ignoreNotesCheckBox.setText(_translate("FindAndReplaceDlg", "Ignore foot¬es and endnotes"))
        self.findButton.setText(_translate("FindAndReplaceDlg", "&Find"))
        self.replaceButton.setText(_translate("FindAndReplaceDlg", "&Replace"))
        self.closeButton.setText(_translate("FindAndReplaceDlg", "Close"))
        self.moreButton.setText(_translate("FindAndReplaceDlg", "&More"))

/home/yrd/eric_workspace/chap09/findandreplacedlg/findandreplacedlg.py

# -*- coding: utf-8 -*-

"""
Module implementing FindAndReplaceDlg.
"""

from PyQt5.QtCore import pyqtSlot,pyqtSignal
from PyQt5.QtWidgets import QDialog,QApplication

from Ui_findandreplacedlg import Ui_FindAndReplaceDlg


class FindAndReplaceDlg(QDialog, Ui_FindAndReplaceDlg):
    """
    Class documentation goes here.
    """
    find = pyqtSignal(str,bool,bool,bool,bool,bool)
    replace = pyqtSignal(str,str,bool,bool,bool,bool,bool)     
    def __init__(self, parent=None):
        """
        Constructor

        @param parent reference to the parent widget
        @type QWidget
        """
        super(FindAndReplaceDlg, self).__init__(parent)
        self.setupUi(self)
        self.moreFrame.hide()
        #self.layout().setSizeConstraint(QLayout.SetFixedSize)
        self.updateUi()        

    @pyqtSlot(str)
    def on_findLineEdit_textEdited(self, text):
        """
        Slot documentation goes here.

        @param p0 DESCRIPTION
        @type str
        """
        # TODO: not implemented yet
        self.updateUi()

    @pyqtSlot()
    def on_findButton_clicked(self):
        self.find.emit(self.findLineEdit.text(),
                       self.caseCheckBox.isChecked(),
                       self.wholeCheckBox.isChecked(),
                       self.backwardsCheckBox.isChecked(),
                       self.regexCheckBox.isChecked(),
                       self.ignoreNotesCheckBox.isChecked())        


    @pyqtSlot()
    def on_replaceButton_clicked(self):
        self.replace.emit(self.findLineEdit.text(),
                          self.replaceLineEdit.text(),
                          self.caseCheckBox.isChecked(),
                          self.wholeCheckBox.isChecked(),
                          self.backwardsCheckBox.isChecked(),
                          self.regexCheckBox.isChecked(),
                          self.ignoreNotesCheckBox.isChecked())

    def updateUi(self):
        enable = self.findLineEdit.text()
        self.findButton.setEnabled(bool(enable))
        self.replaceButton.setEnabled(bool(enable))

if __name__ == "__main__":
    import sys

    def find(what, *args):
        print("Find {0} {1}".format(what, [x for x in args]))

    def replace(old, new, *args):
        print("Replace {0} with {1} {2}".format(
              old, new, [x for x in args]))

    app = QApplication(sys.argv)
    form = FindAndReplaceDlg()
    form.find.connect(find)
    form.replace.connect(replace)
    form.show()
    app.exec_()

运行结果：