原来的代码：
=============================================================================
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
class PenPropertiesDlg(QDialog):
def __init__(self, parent=None):
super(PenPropertiesDlg, self).__init__(parent)
widthLabel = QLabel("&Width:")
self.widthSpinBox = QSpinBox()
widthLabel.setBuddy(self.widthSpinBox)
self.widthSpinBox.setAlignment(Qt.AlignRight|Qt.AlignVCenter)
self.widthSpinBox.setRange(0, 24)
self.beveledCheckBox = QCheckBox("&Beveled edges")
styleLabel = QLabel("&Style:")
self.styleComboBox = QComboBox()
styleLabel.setBuddy(self.styleComboBox)
self.styleComboBox.addItems(["Solid", "Dashed", "Dotted",
"DashDotted", "DashDotDotted"])
okButton = QPushButton("&OK")
cancelButton = QPushButton("Cancel")
buttonLayout = QHBoxLayout()
buttonLayout.addStretch()
buttonLayout.addWidget(okButton)
buttonLayout.addWidget(cancelButton)
layout = QGridLayout()
layout.addWidget(widthLabel, 0, 0)
layout.addWidget(self.widthSpinBox, 0, 1)
layout.addWidget(self.beveledCheckBox, 0, 2)
layout.addWidget(styleLabel, 1, 0)
layout.addWidget(self.styleComboBox, 1, 1, 1, 2)
layout.addLayout(buttonLayout, 2, 0, 1, 3)
self.setLayout(layout)
self.connect(okButton, SIGNAL("clicked()"),
self, SLOT("accept()"))
self.connect(cancelButton, SIGNAL("clicked()"),
self, SLOT("reject()"))
self.setWindowTitle("Pen Properties")
class Form(QDialog):
def __init__(self, parent=None):
super(Form, self).__init__(parent)
self.width = 1
self.beveled = False
self.style = "Solid"
penButtonInline = QPushButton("Set Pen... (Dumb &inline)")
penButton = QPushButton("Set Pen... (Dumb &class)")
self.label = QLabel("The Pen has not been set")
self.label.setTextFormat(Qt.RichText)
layout = QVBoxLayout()
layout.addWidget(penButtonInline)
layout.addWidget(penButton)
layout.addWidget(self.label)
self.setLayout(layout)
self.connect(penButtonInline, SIGNAL("clicked()"),
self.setPenInline)
self.connect(penButton, SIGNAL("clicked()"),
self.setPenProperties)
self.setWindowTitle("Pen")
self.updateData()
def updateData(self):
bevel = ""
if self.beveled:
bevel = "<br>Beveled"
self.label.setText("Width = %d<br>Style = %s%s" % (
self.width, self.style, bevel))
def setPenInline(self):
widthLabel = QLabel("&Width:")
widthSpinBox = QSpinBox()
widthLabel.setBuddy(widthSpinBox)
widthSpinBox.setAlignment(Qt.AlignRight)
widthSpinBox.setRange(0, 24)
widthSpinBox.setValue(self.width)
beveledCheckBox = QCheckBox("&Beveled edges")
beveledCheckBox.setChecked(self.beveled)
styleLabel = QLabel("&Style:")
styleComboBox = QComboBox()
styleLabel.setBuddy(styleComboBox)
styleComboBox.addItems(["Solid", "Dashed", "Dotted",
"DashDotted", "DashDotDotted"])
styleComboBox.setCurrentIndex(styleComboBox.findText(
self.style))
okButton = QPushButton("&OK")
cancelButton = QPushButton("Cancel")
buttonLayout = QHBoxLayout()
buttonLayout.addStretch()
buttonLayout.addWidget(okButton)
buttonLayout.addWidget(cancelButton)
layout = QGridLayout()
layout.addWidget(widthLabel, 0, 0)
layout.addWidget(widthSpinBox, 0, 1)
layout.addWidget(beveledCheckBox, 0, 2)
layout.addWidget(styleLabel, 1, 0)
layout.addWidget(styleComboBox, 1, 1, 1, 2)
layout.addLayout(buttonLayout, 2, 0, 1, 3)
form = QDialog()
form.setLayout(layout)
self.connect(okButton, SIGNAL("clicked()"),
form, SLOT("accept()"))
self.connect(cancelButton, SIGNAL("clicked()"),
form, SLOT("reject()"))
form.setWindowTitle("Pen Properties")
if form.exec_():
self.width = widthSpinBox.value()
self.beveled = beveledCheckBox.isChecked()
self.style = unicode(styleComboBox.currentText())
self.updateData()
def setPenProperties(self):
dialog = PenPropertiesDlg(self)
dialog.widthSpinBox.setValue(self.width)
dialog.beveledCheckBox.setChecked(self.beveled)
dialog.styleComboBox.setCurrentIndex(
dialog.styleComboBox.findText(self.style))
if dialog.exec_():
self.width = dialog.widthSpinBox.value()
self.beveled = dialog.beveledCheckBox.isChecked()
self.style = unicode(dialog.styleComboBox.currentText())
self.updateData()
app = QApplication(sys.argv)
form = Form()
form.show()
app.exec_()
======================================================================
改后的代码：
======================================================================
import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
class PenPropertiesDlg(QDialog):
def __init__(self, parent=None):
super(PenPropertiesDlg, self).__init__(parent)
widthLabel = QLabel("&Width:")# &符号表示加速键 alt + w
self.widthSpinBox = QSpinBox()
widthLabel.setBuddy(self.widthSpinBox)# setBuddy与&符号（加速键）配合，按下加速键时PyQt会把键盘光标移动到相应的窗口部件。
self.widthSpinBox.setAlignment(Qt.AlignRight|Qt.AlignVCenter)
self.widthSpinBox.setRange(0, 24)
self.beveledCheckBox = QCheckBox("&Beveled edges")
styleLabel = QLabel("&Style:")
self.styleComboBox = QComboBox()
styleLabel.setBuddy(self.styleComboBox)
self.styleComboBox.addItems(["Solid", "Dashed", "Dotted",
"DashDotted", "DashDotDotted"])
okButton = QPushButton("&OK")
cancelButton = QPushButton("Cancel")
buttonLayout = QHBoxLayout()
buttonLayout.addStretch()
buttonLayout.addWidget(okButton)
buttonLayout.addWidget(cancelButton)
layout = QGridLayout()
layout.addWidget(widthLabel, 0, 0)
layout.addWidget(self.widthSpinBox, 0, 1)
layout.addWidget(self.beveledCheckBox, 0, 2)
layout.addWidget(styleLabel, 1, 0)
layout.addWidget(self.styleComboBox, 1, 1, 1, 2)
layout.addLayout(buttonLayout, 2, 0, 1, 3)
self.setLayout(layout)# setLayout方法，QDialog继承自QWidget类的方法，用于设置布局。
okButton.clicked.connect(self.accept)
cancelButton.clicked.connect(self.reject)
self.setWindowTitle("Pen Properties")
class Form(QDialog):
def __init__(self, parent=None):
super(Form, self).__init__(parent)
self.width = 1
self.beveled = False
self.style = "Solid"
penButtonInline = QPushButton("Set Pen... (Dumb &inline)")
penButton = QPushButton("Set Pen... (Dumb &class)")
self.label = QLabel("The Pen has not been set")
self.label.setTextFormat(Qt.RichText)
layout = QVBoxLayout()
layout.addWidget(penButtonInline)
layout.addWidget(penButton)
layout.addWidget(self.label)
self.setLayout(layout)
penButtonInline.clicked.connect(self.setPenInline)
penButton.clicked.connect(self.setPenProperties)
self.setWindowTitle("Pen")
self.updateData()
def updateData(self):
bevel = ""
if self.beveled:
bevel = "<br>Beveled"
self.label.setText("Width = %d<br>Style = %s%s" % (
self.width, self.style, bevel))
def setPenInline(self):
widthLabel = QLabel("&Width:")
widthSpinBox = QSpinBox()
widthLabel.setBuddy(widthSpinBox)
widthSpinBox.setAlignment(Qt.AlignRight)
widthSpinBox.setRange(0, 24)
widthSpinBox.setValue(self.width)
beveledCheckBox = QCheckBox("&Beveled edges")
beveledCheckBox.setChecked(self.beveled)
styleLabel = QLabel("&Style:")
styleComboBox = QComboBox()
styleLabel.setBuddy(styleComboBox)
styleComboBox.addItems(["Solid", "Dashed", "Dotted",
"DashDotted", "DashDotDotted"])
styleComboBox.setCurrentIndex(styleComboBox.findText(
self.style))# findText方法用于返回内容为self.style的索引值，setCurrentIndex将这个索引值设置为当前索引
okButton = QPushButton("&OK")
cancelButton = QPushButton("Cancel")
buttonLayout = QHBoxLayout()
buttonLayout.addStretch()
buttonLayout.addWidget(okButton)
buttonLayout.addWidget(cancelButton)
layout = QGridLayout()
layout.addWidget(widthLabel, 0, 0)
layout.addWidget(widthSpinBox, 0, 1)
layout.addWidget(beveledCheckBox, 0, 2)
layout.addWidget(styleLabel, 1, 0)
layout.addWidget(styleComboBox, 1, 1, 1, 2)
layout.addLayout(buttonLayout, 2, 0, 1, 3)
form = QDialog()
form.setLayout(layout)
okButton.clicked.connect(self.accept)
cancelButton.clicked.connect(self.reject)
form.setWindowTitle("Pen Properties")
if form.exec_():
self.width = widthSpinBox.value()
self.beveled = beveledCheckBox.isChecked()
self.style = styleComboBox.currentText()
self.updateData()
def setPenProperties(self):
dialog = PenPropertiesDlg(self)
dialog.widthSpinBox.setValue(self.width)
dialog.beveledCheckBox.setChecked(self.beveled)
dialog.styleComboBox.setCurrentIndex(
dialog.styleComboBox.findText(self.style))
if dialog.exec_():
self.width = dialog.widthSpinBox.value()
self.beveled = dialog.beveledCheckBox.isChecked()
self.style = dialog.styleComboBox.currentText()
self.updateData()
app = QApplication(sys.argv)
form = Form()
form.show()
app.exec_()
