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• python /
• qt /
• gui /
• pyqt

本文是对Python Qt GUI快速编程的第6章的例子MainWindow改写成python3+PyQt5的编码。改动中，本人发现了不少的坑要改动，下文大概列出一些需要更改的重点，并且附上改动后的代码，代码在Python3.5+PyQt5.7的环境下运行并测试正常。请大家参考学习。
此实例有以下程序：
/home/yrd/eric_workspace/charter6/Ui_newimagedlg.py
/home/yrd/eric_workspace/charter6/newimagedlg.py
/home/yrd/eric_workspace/charter6/helpform.py
/home/yrd/eric_workspace/charter6/resizedlg.py
/home/yrd/eric_workspace/charter6/mainwindow.py
资源文件:
/home/yrd/eric_workspace/charter6/resources.qrc
/home/yrd/eric_workspace/charter6/images
/home/yrd/eric_workspace/charter6/help
可在网路上寻找作者这本书的的代码资源获得资源文件。
重点内容：
1，因为settings.value(“RecentFiles”)本身就是list类型，故
self.recentFiles = settings.value(“RecentFiles”).toStringList()
改动为
self.recentFiles=settings.value(“RecentFiles”)
2，类型转换问题

self.restoreGeometry(settings.value("MainWindow/Geometry").toByteArray())
self.restoreState(settings.value("MainWindow/State").toByteArray())

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改动为

self.restoreGeometry(QByteArray(settings.value("MainWindow/Geometry")))
self.restoreState(QByteArray(settings.value("MainWindow/State")))  

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3，引入库的问题，有很多，只列一个例子：
from PyQt5.QtPrintSupport import QPrinter,QPrintDialog
4，实例中的坑，QFileDialog.getSaveFileName和QFileDialog.getOpenFileName所返回的结果是一个tupple。第一为文件名，第二个为文件类型。

fname,tpye = QFileDialog.getSaveFileName(self,"Image Changer - Save Image", fname,"Image files ({0})".format(" ".join(formats)))fname,tpye = QFileDialog.getOpenFileName(self,"Image Changer - Choose Image", dir,"Image files ({0})".format(" ".join(formats)))

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5，PyQt5开发中应该以python的字符串类型取代Qstring类型。self.recentFiles是list类型，故用append或insert而非prepend。

    def addRecentFile(self, fname):if fname is None:returnif not self.recentFiles.contains(fname):self.recentFiles.prepend(QString(fname))while self.recentFiles.count() > 9:self.recentFiles.takeLast()
改成def addRecentFile(self, fname):if fname is None:returnif fname not in self.recentFiles:self.recentFiles.insert(0,fname)while len(self.recentFiles) > 9:self.recentFiles.pop()

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6，信号槽的问题，现举个例子：
self.connect(action, SIGNAL(“triggered()”),self.loadFile)
改成
action.triggered[bool].connect(self.loadFile)
槽self.loadFile根据实际情况也做了些变动。

需要通过pyrcc5将resources.qrc转换成py文件，并在主程序引入。
pyrcc5 -o resources_rc.py resources.qrc

/home/yrd/eric_workspace/charter6/resources.qrc

<!DOCTYPE RCC><RCC version="1.0">
<qresource>
<file alias="filenew.png">images/filenew.png</file>
<file alias="fileopen.png">images/fileopen.png</file>
<file alias="filesave.png">images/filesave.png</file>
<file alias="filesaveas.png">images/filesaveas.png</file>
<file alias="fileprint.png">images/fileprint.png</file>
<file alias="filequit.png">images/filequit.png</file>
<file alias="editinvert.png">images/editinvert.png</file>
<file alias="editswap.png">images/editswap.png</file>
<file alias="editzoom.png">images/editzoom.png</file>
<file alias="editmirror.png">images/editmirror.png</file>
<file alias="editunmirror.png">images/editunmirror.png</file>
<file alias="editmirrorhoriz.png">images/editmirrorhoriz.png</file>
<file alias="editmirrorvert.png">images/editmirrorvert.png</file>
<file alias="back.png">images/back.png</file>
<file alias="home.png">images/home.png</file>
<file alias="icon.png">images/icon.png</file><file>help/editmenu.html</file>
<file>help/filemenu.html</file>
<file>help/index.html</file>
</qresource>
</RCC>

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/home/yrd/eric_workspace/charter6/Ui_newimagedlg.py

# -*- coding: utf-8 -*-from PyQt5 import QtCore, QtGui, QtWidgetsclass Ui_NewImageDlg(object):def setupUi(self, NewImageDlg):NewImageDlg.setObjectName("NewImageDlg")NewImageDlg.resize(287, 214)self.gridlayout = QtWidgets.QGridLayout(NewImageDlg)self.gridlayout.setContentsMargins(9, 9, 9, 9)self.gridlayout.setSpacing(6)self.gridlayout.setObjectName("gridlayout")self.buttonBox = QtWidgets.QDialogButtonBox(NewImageDlg)self.buttonBox.setOrientation(QtCore.Qt.Horizontal)self.buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel|QtWidgets.QDialogButtonBox.Ok)self.buttonBox.setObjectName("buttonBox")self.gridlayout.addWidget(self.buttonBox, 5, 1, 1, 2)spacerItem = QtWidgets.QSpacerItem(269, 16, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)self.gridlayout.addItem(spacerItem, 4, 0, 1, 3)self.colorLabel = QtWidgets.QLabel(NewImageDlg)self.colorLabel.setFrameShape(QtWidgets.QFrame.StyledPanel)self.colorLabel.setFrameShadow(QtWidgets.QFrame.Raised)self.colorLabel.setText("")self.colorLabel.setScaledContents(True)self.colorLabel.setObjectName("colorLabel")self.gridlayout.addWidget(self.colorLabel, 3, 1, 1, 1)self.label_3 = QtWidgets.QLabel(NewImageDlg)self.label_3.setObjectName("label_3")self.gridlayout.addWidget(self.label_3, 3, 0, 1, 1)self.colorButton = QtWidgets.QPushButton(NewImageDlg)self.colorButton.setObjectName("colorButton")self.gridlayout.addWidget(self.colorButton, 3, 2, 1, 1)self.brushComboBox = QtWidgets.QComboBox(NewImageDlg)self.brushComboBox.setObjectName("brushComboBox")self.gridlayout.addWidget(self.brushComboBox, 2, 1, 1, 2)self.label_4 = QtWidgets.QLabel(NewImageDlg)self.label_4.setObjectName("label_4")self.gridlayout.addWidget(self.label_4, 2, 0, 1, 1)self.label = QtWidgets.QLabel(NewImageDlg)self.label.setObjectName("label")self.gridlayout.addWidget(self.label, 0, 0, 1, 1)self.label_2 = QtWidgets.QLabel(NewImageDlg)self.label_2.setObjectName("label_2")self.gridlayout.addWidget(self.label_2, 1, 0, 1, 1)self.heightSpinBox = QtWidgets.QSpinBox(NewImageDlg)self.heightSpinBox.setAlignment(QtCore.Qt.AlignRight)self.heightSpinBox.setMinimum(8)self.heightSpinBox.setMaximum(512)self.heightSpinBox.setSingleStep(4)self.heightSpinBox.setProperty("value", 64)self.heightSpinBox.setObjectName("heightSpinBox")self.gridlayout.addWidget(self.heightSpinBox, 1, 1, 1, 1)self.widthSpinBox = QtWidgets.QSpinBox(NewImageDlg)self.widthSpinBox.setAlignment(QtCore.Qt.AlignRight)self.widthSpinBox.setMinimum(8)self.widthSpinBox.setMaximum(512)self.widthSpinBox.setSingleStep(4)self.widthSpinBox.setProperty("value", 64)self.widthSpinBox.setObjectName("widthSpinBox")self.gridlayout.addWidget(self.widthSpinBox, 0, 1, 1, 1)self.label_4.setBuddy(self.brushComboBox)self.label.setBuddy(self.widthSpinBox)self.label_2.setBuddy(self.heightSpinBox)self.retranslateUi(NewImageDlg)self.buttonBox.accepted.connect(NewImageDlg.accept)self.buttonBox.rejected.connect(NewImageDlg.reject)QtCore.QMetaObject.connectSlotsByName(NewImageDlg)NewImageDlg.setTabOrder(self.widthSpinBox, self.heightSpinBox)NewImageDlg.setTabOrder(self.heightSpinBox, self.brushComboBox)NewImageDlg.setTabOrder(self.brushComboBox, self.colorButton)NewImageDlg.setTabOrder(self.colorButton, self.buttonBox)def retranslateUi(self, NewImageDlg):_translate = QtCore.QCoreApplication.translateNewImageDlg.setWindowTitle(_translate("NewImageDlg", "Image Chooser - New Image"))self.label_3.setText(_translate("NewImageDlg", "Color"))self.colorButton.setText(_translate("NewImageDlg", "&Color..."))self.label_4.setText(_translate("NewImageDlg", "&Brush pattern:"))self.label.setText(_translate("NewImageDlg", "&Width:"))self.label_2.setText(_translate("NewImageDlg", "&Height:"))self.heightSpinBox.setSuffix(_translate("NewImageDlg", " px"))self.widthSpinBox.setSuffix(_translate("NewImageDlg", " px"))

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/home/yrd/eric_workspace/charter6/newimagedlg.py

# -*- coding: utf-8 -*-"""
Module implementing NewImageDlg.
"""from PyQt5.QtCore import pyqtSlot,Qt,QVariant
from PyQt5.QtWidgets import QDialog,QApplication,QColorDialog
from PyQt5.QtGui import QPixmap,QBrush,QPainterfrom Ui_newimagedlg import Ui_NewImageDlgclass NewImageDlg(QDialog, Ui_NewImageDlg):"""Class documentation goes here."""def __init__(self, parent=None):"""Constructor@param parent reference to the parent widget@type QWidget"""super(NewImageDlg, self).__init__(parent)self.setupUi(self)self.color = Qt.redfor value, text in ((Qt.SolidPattern, "Solid"),(Qt.Dense1Pattern, "Dense #1"),(Qt.Dense2Pattern, "Dense #2"),(Qt.Dense3Pattern, "Dense #3"),(Qt.Dense4Pattern, "Dense #4"),(Qt.Dense5Pattern, "Dense #5"),(Qt.Dense6Pattern, "Dense #6"),(Qt.Dense7Pattern, "Dense #7"),(Qt.HorPattern, "Horizontal"),(Qt.VerPattern, "Vertical"),(Qt.CrossPattern, "Cross"),(Qt.BDiagPattern, "Backward Diagonal"),(Qt.FDiagPattern, "Forward Diagonal"),(Qt.DiagCrossPattern, "Diagonal Cross")):self.brushComboBox.addItem(text, QVariant(value))self.colorButton.clicked.connect(self.getColor)self.brushComboBox.activated.connect(self.setColor)self.setColor()self.widthSpinBox.setFocus()def getColor(self):color = QColorDialog.getColor(Qt.black, self)if color.isValid():self.color = colorself.setColor()def setColor(self):pixmap = self._makePixmap(60, 30)self.colorLabel.setPixmap(pixmap)def image(self):pixmap = self._makePixmap(self.widthSpinBox.value(),self.heightSpinBox.value())return QPixmap.toImage(pixmap)def _makePixmap(self, width, height):pixmap = QPixmap(width, height)style = self.brushComboBox.itemData(self.brushComboBox.currentIndex())brush = QBrush(self.color, Qt.BrushStyle(style))painter = QPainter(pixmap)painter.fillRect(pixmap.rect(), Qt.white)painter.fillRect(pixmap.rect(), brush)return pixmap

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/home/yrd/eric_workspace/charter6/helpform.py

# -*- coding: utf-8 -*-from PyQt5.QtCore import QUrl, Qt
from PyQt5.QtWidgets import QAction, QApplication, QDialog,QLabel, QTextBrowser, QToolBar, QVBoxLayout
from PyQt5.QtGui import QIcon,QKeySequence
import resources_rcclass HelpForm(QDialog):def __init__(self, page, parent=None):super(HelpForm, self).__init__(parent)self.setAttribute(Qt.WA_DeleteOnClose)self.setAttribute(Qt.WA_GroupLeader)backAction = QAction(QIcon(":/back.png"), "&Back", self)backAction.setShortcut(QKeySequence.Back)homeAction = QAction(QIcon(":/home.png"), "&Home", self)homeAction.setShortcut("Home")self.pageLabel = QLabel()toolBar = QToolBar()toolBar.addAction(backAction)toolBar.addAction(homeAction)toolBar.addWidget(self.pageLabel)self.textBrowser = QTextBrowser()layout = QVBoxLayout()layout.addWidget(toolBar)layout.addWidget(self.textBrowser, 1)self.setLayout(layout)backAction.triggered.connect(self.tbackward)homeAction.triggered.connect(self.thome)self.textBrowser.sourceChanged.connect(self.updatePageTitle)self.textBrowser.setSearchPaths([":/help"])self.textBrowser.setSource(QUrl(page))self.resize(400, 600)self.setWindowTitle("{0} Help".format(QApplication.applicationName()))def updatePageTitle(self):self.pageLabel.setText(self.textBrowser.documentTitle())def tbackward(self):self.textBrowser.backward()def thome(self):self.textBrowser.home()

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/home/yrd/eric_workspace/charter6/resizedlg.py

# -*- coding: utf-8 -*-from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import (QApplication, QDialog, QDialogButtonBox,QGridLayout, QLabel, QSpinBox)class ResizeDlg(QDialog):def __init__(self, width, height, parent=None):super(ResizeDlg, self).__init__(parent)widthLabel = QLabel("&Width:")self.widthSpinBox = QSpinBox()widthLabel.setBuddy(self.widthSpinBox)self.widthSpinBox.setAlignment(Qt.AlignRight|Qt.AlignVCenter)self.widthSpinBox.setRange(4, width * 4)self.widthSpinBox.setValue(width)heightLabel = QLabel("&Height:")self.heightSpinBox = QSpinBox()heightLabel.setBuddy(self.heightSpinBox)self.heightSpinBox.setAlignment(Qt.AlignRight|Qt.AlignVCenter)self.heightSpinBox.setRange(4, height * 4)self.heightSpinBox.setValue(height)buttonBox = QDialogButtonBox(QDialogButtonBox.Ok|QDialogButtonBox.Cancel)layout = QGridLayout()layout.addWidget(widthLabel, 0, 0)layout.addWidget(self.widthSpinBox, 0, 1)layout.addWidget(heightLabel, 1, 0)layout.addWidget(self.heightSpinBox, 1, 1)layout.addWidget(buttonBox, 2, 0, 1, 2)self.setLayout(layout)buttonBox.accepted.connect(self.accept)buttonBox.rejected.connect(self.reject)self.setWindowTitle("Image Changer - Resize")def result(self):return self.widthSpinBox.value(), self.heightSpinBox.value()

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/home/yrd/eric_workspace/charter6/mainwindow.py

# -*- coding: utf-8 -*-"""
Module implementing MainWindow.
"""from PyQt5.QtCore import pyqtSlot,Qt,PYQT_VERSION_STR,QT_VERSION_STR,QSettings,QTimer,QFile, QFileInfo,QByteArray,QVariant
from PyQt5.QtWidgets import QMainWindow,QDockWidget,QLabel,QDockWidget,QListWidget,QApplication,\QFrame,QAction,QActionGroup,QMessageBox,QSpinBox,QFileDialog,QInputDialog
from PyQt5.QtGui import QImage,QIcon,QKeySequence,QPixmap,QImageReader,QImageWriter,QPainter
from PyQt5.QtPrintSupport import QPrinter,QPrintDialog
import helpform
import newimagedlg
import resizedlg
import platform
import sys
import resources_rc
import os
__version__ = "1.0.0"
class MainWindow(QMainWindow):"""Class documentation goes here."""def __init__(self, parent=None):"""Constructor@param parent reference to the parent widget@type QWidget"""super(MainWindow, self).__init__(parent)self.image = QImage()self.dirty = Falseself.filename = Noneself.mirroredvertically = Falseself.mirroredhorizontally = Falseself.imageLabel = QLabel()self.imageLabel.setMinimumSize(200, 200)self.imageLabel.setAlignment(Qt.AlignCenter)self.imageLabel.setContextMenuPolicy(Qt.ActionsContextMenu)self.setCentralWidget(self.imageLabel)logDockWidget = QDockWidget("Log", self)logDockWidget.setObjectName("LogDockWidget")logDockWidget.setAllowedAreas(Qt.LeftDockWidgetArea|Qt.RightDockWidgetArea)self.listWidget = QListWidget()logDockWidget.setWidget(self.listWidget)self.addDockWidget(Qt.RightDockWidgetArea, logDockWidget)self.printer = Noneself.sizeLabel = QLabel()self.sizeLabel.setFrameStyle(QFrame.StyledPanel|QFrame.Sunken)status = self.statusBar()status.setSizeGripEnabled(False)status.addPermanentWidget(self.sizeLabel)status.showMessage("Ready", 5000)#clearMessage()fileNewAction = self.createAction("&New...", self.fileNew,QKeySequence.New, "filenew", "Create an image file")fileOpenAction = self.createAction("&Open...", self.fileOpen,QKeySequence.Open, "fileopen","Open an existing image file")fileSaveAction = self.createAction("&Save", self.fileSave,QKeySequence.Save, "filesave", "Save the image")fileSaveAsAction = self.createAction("Save &As...",self.fileSaveAs, icon="filesaveas",tip="Save the image using a new name")filePrintAction = self.createAction("&Print", self.filePrint,QKeySequence.Print, "fileprint", "Print the image")fileQuitAction = self.createAction("&Quit", self.close,"Ctrl+Q", "filequit", "Close the application")        editInvertAction = self.createAction("&Invert",self.editInvert, "Ctrl+I", "editinvert","Invert the image's colors", True, "toggled(bool)")editSwapRedAndBlueAction = self.createAction("Sw&ap Red and Blue",self.editSwapRedAndBlue, "Ctrl+A", "editswap","Swap the image's red and blue color components", True,"toggled(bool)")editZoomAction = self.createAction("&Zoom...", self.editZoom,"Alt+Z", "editzoom", "Zoom the image")editResizeAction = self.createAction("&Resize...",self.editResize, "Ctrl+R", "editresize","Resize the image")        mirrorGroup = QActionGroup(self)editUnMirrorAction = self.createAction("&Unmirror",self.editUnMirror, "Ctrl+U", "editunmirror","Unmirror the image", True, "toggled(bool)")mirrorGroup.addAction(editUnMirrorAction)editMirrorHorizontalAction = self.createAction("Mirror &Horizontally", self.editMirrorHorizontal,"Ctrl+H", "editmirrorhoriz","Horizontally mirror the image", True, "toggled(bool)")mirrorGroup.addAction(editMirrorHorizontalAction)editMirrorVerticalAction = self.createAction("Mirror &Vertically", self.editMirrorVertical,"Ctrl+V", "editmirrorvert","Vertically mirror the image", True, "toggled(bool)")mirrorGroup.addAction(editMirrorVerticalAction)editUnMirrorAction.setChecked(True)helpAboutAction = self.createAction("&About Image Changer",self.helpAbout)helpHelpAction = self.createAction("&Help", self.helpHelp,QKeySequence.HelpContents)#file Menuself.fileMenu = self.menuBar().addMenu("&File")self.fileMenuActions = (fileNewAction, fileOpenAction,fileSaveAction, fileSaveAsAction, None, filePrintAction,fileQuitAction)self.fileMenu.aboutToShow.connect(self.updateFileMenu)#edit MenueditMenu = self.menuBar().addMenu("&Edit")self.addActions(editMenu, (editInvertAction,editSwapRedAndBlueAction, editZoomAction,editResizeAction))        #mirrorMenumirrorMenu = editMenu.addMenu(QIcon(":/editmirror.png"),"&Mirror")self.addActions(mirrorMenu, (editUnMirrorAction,editMirrorHorizontalAction, editMirrorVerticalAction))   #help MenuhelpMenu = self.menuBar().addMenu("&Help")self.addActions(helpMenu, (helpAboutAction, helpHelpAction))   #tool barfileToolbar = self.addToolBar("File")fileToolbar.setObjectName("FileToolBar")self.addActions(fileToolbar, (fileNewAction, fileOpenAction,fileSaveAsAction))editToolbar = self.addToolBar("Edit")editToolbar.setObjectName("EditToolBar")self.addActions(editToolbar, (editInvertAction,editSwapRedAndBlueAction, editUnMirrorAction,editMirrorVerticalAction, editMirrorHorizontalAction))self.zoomSpinBox = QSpinBox()self.zoomSpinBox.setRange(1, 400)self.zoomSpinBox.setSuffix(" %")self.zoomSpinBox.setValue(100)self.zoomSpinBox.setToolTip("Zoom the image")self.zoomSpinBox.setStatusTip(self.zoomSpinBox.toolTip())self.zoomSpinBox.setFocusPolicy(Qt.NoFocus)self.zoomSpinBox.valueChanged[int].connect(self.showImage)editToolbar.addWidget(self.zoomSpinBox)self.addActions(self.imageLabel, (editInvertAction,editSwapRedAndBlueAction, editUnMirrorAction,editMirrorVerticalAction, editMirrorHorizontalAction))self.resetableActions = ((editInvertAction, False),(editSwapRedAndBlueAction, False),(editUnMirrorAction, True))settings = QSettings("MyCompany", "MyApp")self.recentFiles=settings.value("RecentFiles")#self.recentFiles = []self.restoreGeometry(QByteArray(settings.value("MainWindow/Geometry")))self.restoreState(QByteArray(settings.value("MainWindow/State")))          self.setWindowTitle("Image Changer")self.updateFileMenu()QTimer.singleShot(0, self.loadInitialFile)def createAction(self, text, slot=None, shortcut=None, icon=None,tip=None, checkable=False, signal="triggered()"):action = QAction(text, self)if icon is not None:action.setIcon(QIcon(":/{0}.png".format(icon)))if shortcut is not None:action.setShortcut(shortcut)if tip is not None:action.setToolTip(tip)action.setStatusTip(tip)if slot is not None and signal=="triggered()":action.triggered.connect(slot)if slot is not None and signal=="toggled(bool)":action.toggled[bool].connect(slot)        if checkable:action.setCheckable(True)return actiondef addActions(self, target, actions):for action in actions:if action is None:target.addSeparator()else:target.addAction(action)def updateFileMenu(self):self.fileMenu.clear()self.addActions(self.fileMenu, self.fileMenuActions[:-1])current = self.filenamerecentFiles = []#self.recentFiles=[]for fname in self.recentFiles:if fname != current and QFile.exists(fname):#recentFiles.insert(0,fname)recentFiles.append(fname)if recentFiles:self.fileMenu.addSeparator()for i, fname in enumerate(recentFiles):action = QAction(QIcon(":/icon.png"),"&{0} {1}".format(i + 1, QFileInfo(fname).fileName()), self)action.setData(QVariant(fname))action.triggered[bool].connect(self.loadFile)self.fileMenu.addAction(action)self.fileMenu.addSeparator()self.fileMenu.addAction(self.fileMenuActions[-1])        def okToContinue(self):if self.dirty:reply = QMessageBox.question(self,"Image Changer - Unsaved Changes","Save unsaved changes?",QMessageBox.Yes|QMessageBox.No|QMessageBox.Cancel)if reply == QMessageBox.Cancel:return Falseelif reply == QMessageBox.Yes:return self.fileSave()return True                def fileNew(self):if not self.okToContinue():returndialog = newimagedlg.NewImageDlg(self)if dialog.exec_():self.addRecentFile(self.filename)self.image = QImage()for action, check in self.resetableActions:action.setChecked(check)self.image = dialog.image()self.filename = Noneself.dirty = Trueself.showImage()self.sizeLabel.setText("{0} x {1}".format(self.image.width(),self.image.height()))self.updateStatus("Created new image")        def fileOpen(self):if not self.okToContinue():returndir = (os.path.dirname(self.filename)if self.filename is not None else ".")formats = (["*.{0}".format(format.data().decode("ascii").lower())for format in QImageReader.supportedImageFormats()])fname,tpye = QFileDialog.getOpenFileName(self,"Image Changer - Choose Image", dir,"Image files ({0})".format(" ".join(formats)))if fname:self.loadFile(True,fname)        def fileSave(self):if self.image.isNull():return Trueif self.filename is None:return self.fileSaveAs()else:if self.image.save(self.filename, None):self.updateStatus("Saved as {0}".format(self.filename))self.dirty = Falsereturn Trueelse:self.updateStatus("Failed to save {0}".format(self.filename))return Falsedef fileSaveAs(self):if self.image.isNull():return Truefname = self.filename if self.filename is not None else "."formats = (["*.{0}".format(format.data().decode("ascii").lower())for format in QImageWriter.supportedImageFormats()])fname,tpye = QFileDialog.getSaveFileName(self,"Image Changer - Save Image", fname,"Image files ({0})".format(" ".join(formats)))if fname:if "." not in fname:fname += ".png"self.addRecentFile(fname)self.filename = fnamereturn self.fileSave()return False        def filePrint(self):if self.image.isNull():returnif self.printer is None:self.printer = QPrinter(QPrinter.HighResolution)self.printer.setPageSize(QPrinter.Letter)form = QPrintDialog(self.printer, self)if form.exec_():painter = QPainter(self.printer)rect = painter.viewport()size = self.image.size()size.scale(rect.size(), Qt.KeepAspectRatio)painter.setViewport(rect.x(), rect.y(), size.width(),size.height())painter.drawImage(0, 0, self.image)        def loadFile(self,actiontrigger=False,fname=None):if fname is None:action = self.sender()if isinstance(action, QAction):fname = str(action.data())if not self.okToContinue():returnelse:returnprint(fname)if fname:self.filename = Noneimage = QImage(fname)if image.isNull():message = "Failed to read {0}".format(fname)else:self.addRecentFile(fname)self.image = QImage()for action, check in self.resetableActions:action.setChecked(check)self.image = imageself.filename = fnameself.showImage()self.dirty = Falseself.sizeLabel.setText("{0} x {1}".format(image.width(), image.height()))message = "Loaded {0}".format(os.path.basename(fname))self.updateStatus(message)      def loadInitialFile(self):settings = QSettings()fname = str(settings.value("LastFile"))if fname and QFile.exists(fname):self.loadFile(fname)def addRecentFile(self, fname):if fname is None:returnif fname not in self.recentFiles:self.recentFiles.insert(0,fname)while len(self.recentFiles) > 9:self.recentFiles.pop()def updateStatus(self, message):self.statusBar().showMessage(message, 5000)self.listWidget.addItem(message)if self.filename is not None:self.setWindowTitle("Image Changer - {0}[*]".format(os.path.basename(self.filename)))elif not self.image.isNull():self.setWindowTitle("Image Changer - Unnamed[*]")else:self.setWindowTitle("Image Changer[*]")self.setWindowModified(self.dirty)def editInvert(self, on):if self.image.isNull():returnself.image.invertPixels()self.showImage()self.dirty = Trueself.updateStatus("Inverted" if on else "Uninverted")def editSwapRedAndBlue(self, on):if self.image.isNull():returnself.image = self.image.rgbSwapped()self.showImage()self.dirty = Trueself.updateStatus(("Swapped Red and Blue"if on else "Unswapped Red and Blue"))def editZoom(self):if self.image.isNull():returnpercent, ok = QInputDialog.getInt(self,"Image Changer - Zoom", "Percent:",self.zoomSpinBox.value(), 1, 400)if ok:self.zoomSpinBox.setValue(percent)def editUnMirror(self, on):if self.image.isNull():returnif self.mirroredhorizontally:self.editMirrorHorizontal(False)if self.mirroredvertically:self.editMirrorVertical(False)def editMirrorHorizontal(self, on):if self.image.isNull():returnself.image = self.image.mirrored(True, False)self.showImage()self.mirroredhorizontally = not self.mirroredhorizontallyself.dirty = Trueself.updateStatus(("Mirrored Horizontally"if on else "Unmirrored Horizontally"))def editMirrorVertical(self, on):if self.image.isNull():returnself.image = self.image.mirrored(False, True)self.showImage()self.mirroredvertically = not self.mirroredverticallyself.dirty = Trueself.updateStatus(("Mirrored Vertically"if on else "Unmirrored Vertically"))           def editResize(self):if self.image.isNull():returnform = resizedlg.ResizeDlg(self.image.width(),self.image.height(), self)if form.exec_():width, height = form.result()if (width == self.image.width() andheight == self.image.height()):self.statusBar().showMessage("Resized to the same size",5000)else:self.image = self.image.scaled(width, height)self.showImage()self.dirty = Truesize = "{0} x {1}".format(self.image.width(),self.image.height())self.sizeLabel.setText(size)self.updateStatus("Resized to {0}".format(size))def helpAbout(self):QMessageBox.about(self, "About Image Changer","""<b>Image Changer</b> v {0}<p>Copyright &copy; 2008-9 Qtrac Ltd. All rights reserved.<p>This application can be used to performsimple image manipulations.<p>Python {1} - Qt {2} - PyQt {3} on {4}""".format(__version__, platform.python_version(),QT_VERSION_STR, PYQT_VERSION_STR,platform.system()))def helpHelp(self):form = helpform.HelpForm("index.html", self)form.show()def showImage(self, percent=None):if self.image.isNull():returnif percent is None:percent = self.zoomSpinBox.value()factor = percent / 100.0width = self.image.width() * factorheight = self.image.height() * factorimage = self.image.scaled(width, height, Qt.KeepAspectRatio)self.imageLabel.setPixmap(QPixmap.fromImage(image))def closeEvent(self, event):if self.okToContinue():settings = QSettings("MyCompany", "MyApp")settings.setValue("LastFile", self.filename)settings.setValue("RecentFiles", self.recentFiles)settings.setValue("MainWindow/Geometry",self.saveGeometry())settings.setValue("MainWindow/State", self.saveState())else:event.ignore()if __name__ == "__main__":app = QApplication(sys.argv)form = MainWindow()form.show()app.exec_()

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运行结果：