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&notes "
                          "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&notes 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：

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