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pyqt 学习基础5 - 笔记软件的编辑器
笔记软件的编辑器
几个疑问
今天在试着为笔记软件写个编辑器，然后参考qt自带的textedit的示例。下面是一个撤销操作的一段代码，我就疑惑了，这跟用QPushButton应该差不多吧。
self.actionUndo = QtGui.QAction(
QtGui.QIcon.fromTheme(‘edit-undo‘, QtGui.QIcon(rsrcPath + ‘/editundo.png‘)), "&Undo", self, shortcut=QtGui.QKeySequence.Undo) tb.addAction(self.actionUndo) menu.addAction(self.actionUndo)
代码比较没有注释
# -*- coding:utf8 -*-
import sip
sip.setapi(‘QString‘, 2)
from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import mainQss
# NoDragCombo这个类是为了防止拖动Combobox所带来的bug
class NoDragCombo(QComboBox):
def __init__(self, parent=None):
QComboBox.__init__(self, parent)
def mouseMoveEvent(self, QMouseEvent):
pass
def mouseReleaseEvent(self, QMouseEvent):
pass
class NoDragFontCombo(QFontComboBox):
def __init__(self, parent=None):
QFontComboBox.__init__(self, parent)
def mouseMoveEvent(self, QMouseEvent):
pass
def mouseReleaseEvent(self, QMouseEvent):
pass
class CenterWidget(QWidget):
def __init__(self, fileName=None, parent=None):
QWidget.__init__(self, parent)
self.initAllObjects()
self.setupFileActions()
self.setupEditActions()
self.setupTextActions()
self.setupTextEdit()
self.setupStyleSheet()
self.setupMainUi()
self.fontChanged(self.textEdit.font())
self.colorChanged(self.textEdit.textColor())
self.alignmentChanged(self.textEdit.alignment())
self.textEdit.document().modificationChanged.connect(
self.actionSave.setEnabled)
self.textEdit.document().modificationChanged.connect(
self.setWindowModified)
self.textEdit.document().undoAvailable.connect(
self.actionUndo.setEnabled)
self.textEdit.document().redoAvailable.connect(
self.actionRedo.setEnabled)
self.actionSave.setEnabled(self.textEdit.document().isModified())
self.actionUndo.setEnabled(self.textEdit.document().isUndoAvailable())
self.actionRedo.setEnabled(self.textEdit.document().isRedoAvailable())
self.actionUndo.triggered.connect(self.textEdit.undo)
self.actionRedo.triggered.connect(self.textEdit.redo)
self.actionCut.setEnabled(False)
self.actionCopy.setEnabled(False)
self.actionCut.triggered.connect(self.textEdit.cut)
self.actionCopy.triggered.connect(self.textEdit.copy)
self.actionPaste.triggered.connect(self.textEdit.paste)
self.textEdit.copyAvailable.connect(self.actionCut.setEnabled)
self.textEdit.copyAvailable.connect(self.actionCopy.setEnabled)
QtGui.QApplication.clipboard().dataChanged.connect(
self.clipboardDataChanged)
def initAllObjects(self):
self.oneStyle = QStyleFactory.create("plastique")
self.textEdit = QTextEdit(self)
self.layout = QVBoxLayout(self)
self.topLayout = QHBoxLayout()
self.topWidget = QWidget(self)
self.topWidgetLayout = QHBoxLayout(self.topWidget)
self.fileBtn = QPushButton("File",self.topWidget)
self.editBtn = QPushButton("Edit",self.topWidget)
self.textBtn = QPushButton("Text",self.topWidget)
self.comboFont = NoDragFontCombo(self.topWidget)
self.comboSize = NoDragCombo(self.topWidget)
self.comboStyle = NoDragCombo(self.topWidget)
def setupStyleSheet(self):
# self.fileBtn.setStyleSheet(mainQss.writeButton)
# self.fileBtn.setGeometry(2, 1, 24, 24)
# self.editBtn.setStyleSheet(mainQss.writeButton)
# self.editBtn.setGeometry(28, 1, 24, 24)
# self.textBtn.setStyleSheet(mainQss.writeButton)
# self.textBtn.setGeometry(54, 1, 24, 24)
# self.comboFont.setGeometry(80, 1, 100, 24)
# self.comboSize.setGeometry(182, 1, 100, 24)
# self.comboStyle.setGeometry(284, 1, 100, 24)
self.fileBtn.setStyle(self.oneStyle)
self.editBtn.setStyle(self.oneStyle)
self.textBtn.setStyle(self.oneStyle)
self.comboStyle.setStyle(self.oneStyle)
self.comboSize.setStyle(self.oneStyle)
self.comboFont.setStyle(self.oneStyle)
self.topWidget.setMinimumHeight(26)
# self.topWidget.setMaximumHeight(26)
self.topWidget.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Maximum)
self.topLayout.setContentsMargins(0, 0, 0, 0)
self.layout.setContentsMargins(0, 0, 0, 0)
self.layout.setSpacing(0)
def setupTextEdit(self):
self.textEdit.setFocus()
oneFont = QFont("Times New Romane", 13, QFont.Normal, False)
self.textEdit.setFont(oneFont)
self.textEdit.currentCharFormatChanged.connect(
self.currentCharFormatChanged)
self.textEdit.cursorPositionChanged.connect(self.cursorPositionChanged)
self.setCurrentFileName()
def setupMainUi(self):
self.topLayout.addWidget(self.topWidget)
self.layout.addLayout(self.topLayout)
self.layout.addWidget(self.textEdit)
self.setLayout(self.layout)
self.topWidgetLayout.addWidget(self.fileBtn)
self.topWidgetLayout.addWidget(self.editBtn)
self.topWidgetLayout.addWidget(self.textBtn)
self.topWidgetLayout.addWidget(self.comboFont)
self.topWidgetLayout.addWidget(self.comboSize)
self.topWidgetLayout.addWidget(self.comboStyle)
def setupFileActions(self):
menu = QMenu("&File", self)
self.fileBtn.setMenu(menu)
self.actionNew = QAction("&New", self,
priority=QAction.LowPriority,
shortcut=QKeySequence.New,
triggered=self.fileNew)
menu.addAction(self.actionNew)
self.actionNew = QtGui.QAction(
"&New", self, priority=QtGui.QAction.LowPriority,
shortcut=QtGui.QKeySequence.New, triggered=self.fileNew)
menu.addAction(self.actionNew)
self.actionOpen = QtGui.QAction(
"&Open...", self, shortcut=QtGui.QKeySequence.Open,
triggered=self.fileOpen)
menu.addAction(self.actionOpen)
menu.addSeparator()
self.actionSave = QtGui.QAction(
"&Save", self, shortcut=QtGui.QKeySequence.Save,
triggered=self.fileSave, enabled=False)
menu.addAction(self.actionSave)
self.actionSaveAs = QtGui.QAction("Save &As...", self,
priority=QtGui.QAction.LowPriority,
shortcut=QtCore.Qt.CTRL + QtCore.Qt.SHIFT + QtCore.Qt.Key_S,
triggered=self.fileSaveAs)
menu.addAction(self.actionSaveAs)
menu.addSeparator()
self.actionPrint = QtGui.QAction(
"&Print...", self, priority=QtGui.QAction.LowPriority,
shortcut=QtGui.QKeySequence.Print, triggered=self.filePrint)
menu.addAction(self.actionPrint)
self.actionPrintPreview = QtGui.QAction(
"Print Preview...", self,
shortcut=QtCore.Qt.CTRL + QtCore.Qt.SHIFT + QtCore.Qt.Key_P,
triggered=self.filePrintPreview)
menu.addAction(self.actionPrintPreview)
self.actionPrintPdf = QtGui.QAction(
"&Export PDF...", self, priority=QtGui.QAction.LowPriority,
shortcut=QtCore.Qt.CTRL + QtCore.Qt.Key_D,
triggered=self.filePrintPdf)
menu.addAction(self.actionPrintPdf)
menu.addSeparator()
self.actionQuit = QtGui.QAction("&Quit", self,
shortcut=QtGui.QKeySequence.Quit, triggered=self.close)
menu.addAction(self.actionQuit)
def setupEditActions(self):
menu = QMenu("&Edit", self)
self.editBtn.setMenu(menu)
self.actionUndo = QtGui.QAction(
"&Undo", self, shortcut=QtGui.QKeySequence.Undo)
menu.addAction(self.actionUndo)
self.actionRedo = QtGui.QAction(
"&Redo", self, priority=QtGui.QAction.LowPriority,
shortcut=QtGui.QKeySequence.Redo)
menu.addAction(self.actionRedo)
menu.addSeparator()
self.actionCut = QtGui.QAction(
"Cu&t", self, priority=QtGui.QAction.LowPriority,
shortcut=QtGui.QKeySequence.Cut)
menu.addAction(self.actionCut)
self.actionCopy = QtGui.QAction(
"&Copy", self, priority=QtGui.QAction.LowPriority,
shortcut=QtGui.QKeySequence.Copy)
menu.addAction(self.actionCopy)
self.actionPaste = QtGui.QAction(
"&Paste", self, priority=QtGui.QAction.LowPriority,
shortcut=QtGui.QKeySequence.Paste,
enabled=(len(QtGui.QApplication.clipboard().text()) != 0))
menu.addAction(self.actionPaste)
def fileNew(self):
print "create new file"
if self.maybeSave():
self.textEdit.clear()
self.setCurrentFileName()
def fileOpen(self):
print "open file"
fn = QFileDialog.getOpenFileName(self, "Open File...", None,
"HTML-Files (*.htm *html);;ALL Files (*)")
if fn:
self.load(fn)
def filePrint(self):
printer = QtGui.QPrinter(QtGui.QPrinter.HighResolution)
dlg = QtGui.QPrintDialog(printer, self)
if self.textEdit.textCursor().hasSelection():
dlg.addEnabledOption(QtGui.QAbstractPrintDialog.PrintSelection)
dlg.setWindowTitle("Print Document")
if dlg.exec_() == QtGui.QDialog.Accepted:
self.textEdit.print_(printer)
del dlg
def filePrintPdf(self):
print "print pdf"
fn = QtGui.QFileDialog.getSaveFileName(self, "Export PDF", None,
"PDF files (*.pdf);;All Files (*)")
if fn:
if QtCore.QFileInfo(fn).suffix().isEmpty():
fn += ‘.pdf‘
printer = QtGui.QPrinter(QtGui.QPrinter.HighResolution)
printer.setOutputFormat(QtGui.QPrinter.PdfFormat)
printer.setOutputFileName(fileName)
self.textEdit.document().print_(printer)
def printPreview(self, printer):
self.textEdit.print_(printer)
def filePrintPreview(self):
print "print Preview"
printer = QtGui.QPrinter(QtGui.QPrinter.HighResolution)
preview = QtGui.QPrintPreviewDialog(printer, self)
preview.paintRequested.connect(self.printPreview)
preview.exec_()
def fileSave(self):
print "save file"
if not self.fileName:
return self.fileSaveAs()
writer = QTextDocumentWriter(self.fileName)
success = writer.write(self.textEdit.document())
if success:
self.textEdit.document().setModified(False)
return success
def fileSaveAs(self):
print "file save as"
fn = QtGui.QFileDialog.getSaveFileName(self, "Save as...", "C:/",
"ODF files (*.odt);;HTML-Files (*.htm *.html);;All Files (*)")
if not fn:
return False
lfn = fn.lower()
if not lfn.endswith((‘.odt‘, ‘.htm‘, ‘.html‘)):
# The default.
fn += ‘.odt‘
self.setCurrentFileName(fn)
return self.fileSave()
def load(self, f):
if not QtCore.QFile.exists(f):
return False
fh = QtCore.QFile(f)
if not fh.open(QtCore.QFile.ReadOnly):
return False
data = http://www.mamicode.com/fh.readAll()>
上图
pyqt 学习基础5 - 笔记软件的编辑器
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