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python3+PyQt5泛型委托详解

转载 作者：qq735679552 更新时间：2022-09-28 22:32:09 27 4
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自定义委托可以让我们对视图中出现的数据项的外观和行为进行完全控制。如果有很多模型，可能会希望不是全部的大多数模型能够仅用一个自定义委托，如果不能这么做，那么对于这些自定义委托，将很有可能存在大量重复代码。为了使得维护工作变得轻松，更好的方法为不要为每个模型创建一个自定义委托，而是用一系列的通用组件来共同构成一个委托。本文通过Python3+pyqt5实现了python Qt GUI 快速编程的16章的泛型委托例子.

/home/yrd/eric_workspace/chap16/richtextlineedit.py 。

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#!/usr/bin/env python3
 
import platform
import sys
import html
from PyQt5.QtCore import QSize, Qt,pyqtSignal
from PyQt5.QtGui import QColor, QFont,QFontMetrics, QIcon, QKeySequence, QPixmap,QTextCharFormat
from PyQt5.QtWidgets import QAction,QApplication,QMenu,QTextEdit
 
 
class RichTextLineEdit(QTextEdit):
  returnPressed = pyqtSignal()
  (Bold, Italic, Underline, StrikeOut, Monospaced, Sans, Serif,
   NoSuperOrSubscript, Subscript, Superscript) = range ( 10 )
 
 
  def __init__( self , parent = None ):
   super (RichTextLineEdit, self ).__init__(parent)
 
   self .monofamily = "courier"
   self .sansfamily = "helvetica"
   self .seriffamily = "times"
   self .setLineWrapMode(QTextEdit.NoWrap)
   self .setTabChangesFocus( True )
   self .setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
   self .setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
   fm = QFontMetrics( self .font())
   h = int (fm.height() * ( 1.4 if platform.system() = = "Windows"
          else 1.2 ))
   self .setMinimumHeight(h)
   self .setMaximumHeight( int (h * 1.2 ))
   self .setToolTip( "Press <b>Ctrl+M</b> for the text effects "
     "menu and <b>Ctrl+K</b> for the color menu" )
 
 
  def toggleItalic( self ):
   self .setFontItalic( not self .fontItalic())
 
 
  def toggleUnderline( self ):
   self .setFontUnderline( not self .fontUnderline())
 
 
  def toggleBold( self ):
   self .setFontWeight(QFont.Normal
     if self .fontWeight() > QFont.Normal else QFont.Bold)
 
 
  def sizeHint( self ):
   return QSize( self .document().idealWidth() + 5 ,
       self .maximumHeight())
 
 
  def minimumSizeHint( self ):
   fm = QFontMetrics( self .font())
   return QSize(fm.width( "WWWW" ), self .minimumHeight())
 
 
  def contextMenuEvent( self , event):
   self .textEffectMenu()
 
 
  def keyPressEvent( self , event):
   if event.modifiers() & Qt.ControlModifier:
    handled = False
    if event.key() = = Qt.Key_B:
     self .toggleBold()
     handled = True
    elif event.key() = = Qt.Key_I:
     self .toggleItalic()
     handled = True
    elif event.key() = = Qt.Key_K:
     self .colorMenu()
     handled = True
    elif event.key() = = Qt.Key_M:
     self .textEffectMenu()
     handled = True
    elif event.key() = = Qt.Key_U:
     self .toggleUnderline()
     handled = True
    if handled:
     event.accept()
     return
   if event.key() in (Qt.Key_Enter, Qt.Key_Return):
    self .returnPressed.emit()
    event.accept()
   else :
    QTextEdit.keyPressEvent( self , event)
 
 
  def colorMenu( self ):
   pixmap = QPixmap( 22 , 22 )
   menu = QMenu( "Colour" )
   for text, color in (
     ( "&Black" , Qt.black),
     ( "B&lue" , Qt.blue),
     ( "Dark Bl&ue" , Qt.darkBlue),
     ( "&Cyan" , Qt.cyan),
     ( "Dar&k Cyan" , Qt.darkCyan),
     ( "&Green" , Qt.green),
     ( "Dark Gr&een" , Qt.darkGreen),
     ( "M&agenta" , Qt.magenta),
     ( "Dark Mage&nta" , Qt.darkMagenta),
     ( "&Red" , Qt.red),
     ( "&Dark Red" , Qt.darkRed)):
    color = QColor(color)
    pixmap.fill(color)
    action = menu.addAction(QIcon(pixmap), text, self .setColor)
    action.setData(color)
   self .ensureCursorVisible()
   menu.exec_( self .viewport().mapToGlobal(
      self .cursorRect().center()))
 
 
  def setColor( self ):
   action = self .sender()
   if action is not None and isinstance (action, QAction):
    color = QColor(action.data())
    if color.isValid():
     self .setTextColor(color)
 
 
  def textEffectMenu( self ):
   format = self .currentCharFormat()
   menu = QMenu( "Text Effect" )
   for text, shortcut, data, checked in (
     ( "&Bold" , "Ctrl+B" , RichTextLineEdit.Bold,
      self .fontWeight() > QFont.Normal),
     ( "&Italic" , "Ctrl+I" , RichTextLineEdit.Italic,
      self .fontItalic()),
     ( "Strike &out" , None , RichTextLineEdit.StrikeOut,
      format .fontStrikeOut()),
     ( "&Underline" , "Ctrl+U" , RichTextLineEdit.Underline,
      self .fontUnderline()),
     ( "&Monospaced" , None , RichTextLineEdit.Monospaced,
      format .fontFamily() = = self .monofamily),
     ( "&Serifed" , None , RichTextLineEdit.Serif,
      format .fontFamily() = = self .seriffamily),
     ( "S&ans Serif" , None , RichTextLineEdit.Sans,
      format .fontFamily() = = self .sansfamily),
     ( "&No super or subscript" , None ,
      RichTextLineEdit.NoSuperOrSubscript,
      format .verticalAlignment() = =
      QTextCharFormat.AlignNormal),
     ( "Su&perscript" , None , RichTextLineEdit.Superscript,
      format .verticalAlignment() = =
      QTextCharFormat.AlignSuperScript),
     ( "Subs&cript" , None , RichTextLineEdit.Subscript,
      format .verticalAlignment() = =
      QTextCharFormat.AlignSubScript)):
    action = menu.addAction(text, self .setTextEffect)
    if shortcut is not None :
     action.setShortcut(QKeySequence(shortcut))
    action.setData(data)
    action.setCheckable( True )
    action.setChecked(checked)
   self .ensureCursorVisible()
   menu.exec_( self .viewport().mapToGlobal(
      self .cursorRect().center()))
 
 
  def setTextEffect( self ):
   action = self .sender()
   if action is not None and isinstance (action, QAction):
    what = action.data()
    if what = = RichTextLineEdit.Bold:
     self .toggleBold()
     return
    if what = = RichTextLineEdit.Italic:
     self .toggleItalic()
     return
    if what = = RichTextLineEdit.Underline:
     self .toggleUnderline()
     return
    format = self .currentCharFormat()
    if what = = RichTextLineEdit.Monospaced:
     format .setFontFamily( self .monofamily)
    elif what = = RichTextLineEdit.Serif:
     format .setFontFamily( self .seriffamily)
    elif what = = RichTextLineEdit.Sans:
     format .setFontFamily( self .sansfamily)
    if what = = RichTextLineEdit.StrikeOut:
     format .setFontStrikeOut( not format .fontStrikeOut())
    if what = = RichTextLineEdit.NoSuperOrSubscript:
     format .setVerticalAlignment(
       QTextCharFormat.AlignNormal)
    elif what = = RichTextLineEdit.Superscript:
     format .setVerticalAlignment(
       QTextCharFormat.AlignSuperScript)
    elif what = = RichTextLineEdit.Subscript:
     format .setVerticalAlignment(
       QTextCharFormat.AlignSubScript)
    self .mergeCurrentCharFormat( format )
 
 
  def toSimpleHtml( self ):
   htmltext = ""
   black = QColor(Qt.black)
   block = self .document().begin()
   while block.isValid():
    iterator = block.begin()
    while iterator ! = block.end():
     fragment = iterator.fragment()
     if fragment.isValid():
      format = fragment.charFormat()
      family = format .fontFamily()
      color = format .foreground().color()    
      text = html.escape(fragment.text())
      if ( format .verticalAlignment() = =
       QTextCharFormat.AlignSubScript):
       text = "<sub>{0}</sub>" . format (text)
      elif ( format .verticalAlignment() = =
        QTextCharFormat.AlignSuperScript):
       text = "<sup>{0}</sup>" . format (text)
      if format .fontUnderline():
       text = "<u>{0}</u>" . format (text)
      if format .fontItalic():
       text = "<i>{0}</i>" . format (text)
      if format .fontWeight() > QFont.Normal:
       text = "<b>{0}</b>" . format (text)
      if format .fontStrikeOut():
       text = "<s>{0}</s>" . format (text)
      if color ! = black or family:
       attribs = ""
       if color ! = black:
        attribs + = ' color="{0}"' . format (color.name())
       if family:
        attribs + = ' face="{0}"' . format (family)
       text = "<font{0}>{1}</font>" . format (attribs,text)
      htmltext + = text
     iterator + = 1
    block = block. next ()
   return htmltext
 
if __name__ = = "__main__" :
  def printout(lineedit):
   print ( str (lineedit.toHtml()))
   print ( str (lineedit.toPlainText()))
   print ( str (lineedit.toSimpleHtml()))   
  app = QApplication(sys.argv)
  lineedit = RichTextLineEdit()
  lineedit.returnPressed.connect( lambda :printout(lineedit))
  lineedit.show()
  lineedit.setWindowTitle( "RichTextEdit" )
  app.exec_()

/home/yrd/eric_workspace/chap16/genericdelegates.py 。

  。

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#!/usr/bin/env python3
 
from PyQt5.QtCore import (QDate, QSize, Qt)
from PyQt5.QtWidgets import (QApplication, QDateEdit, QLineEdit,
   QSpinBox, QStyledItemDelegate,QStyle)
from PyQt5.QtGui import QColor,QTextDocument
import richtextlineedit
 
 
class GenericDelegate(QStyledItemDelegate):
 
  def __init__( self , parent = None ):
   super (GenericDelegate, self ).__init__(parent)
   self .delegates = {}
 
 
  def insertColumnDelegate( self , column, delegate):
   delegate.setParent( self )
   self .delegates[column] = delegate
 
 
  def removeColumnDelegate( self , column):
   if column in self .delegates:
    del self .delegates[column]
 
 
  def paint( self , painter, option, index):
   delegate = self .delegates.get(index.column())
   if delegate is not None :
    delegate.paint(painter, option, index)
   else :
    QStyledItemDelegate.paint( self , painter, option, index)
 
 
  def createEditor( self , parent, option, index):
   delegate = self .delegates.get(index.column())
   if delegate is not None :
    return delegate.createEditor(parent, option, index)
   else :
    return QStyledItemDelegate.createEditor( self , parent, option,
              index)
 
 
  def setEditorData( self , editor, index):
   delegate = self .delegates.get(index.column())
   if delegate is not None :
    delegate.setEditorData(editor, index)
   else :
    QStyledItemDelegate.setEditorData( self , editor, index)
 
 
  def setModelData( self , editor, model, index):
   delegate = self .delegates.get(index.column())
   if delegate is not None :
    delegate.setModelData(editor, model, index)
   else :
    QStyledItemDelegate.setModelData( self , editor, model, index)
 
 
class IntegerColumnDelegate(QStyledItemDelegate):
 
  def __init__( self , minimum = 0 , maximum = 100 , parent = None ):
   super (IntegerColumnDelegate, self ).__init__(parent)
   self .minimum = minimum
   self .maximum = maximum
 
 
  def createEditor( self , parent, option, index):
   spinbox = QSpinBox(parent)
   spinbox.setRange( self .minimum, self .maximum)
   spinbox.setAlignment(Qt.AlignRight|Qt.AlignVCenter)
   return spinbox
 
 
  def setEditorData( self , editor, index):
   value = index.model().data(index, Qt.DisplayRole)
   editor.setValue(value)
 
 
  def setModelData( self , editor, model, index):
   editor.interpretText()
   model.setData(index, editor.value())
 
 
class DateColumnDelegate(QStyledItemDelegate):
 
  def __init__( self , minimum = QDate(),
      maximum = QDate.currentDate(),
      format = "yyyy-MM-dd" , parent = None ):
   super (DateColumnDelegate, self ).__init__(parent)
   self .minimum = minimum
   self .maximum = maximum
   self . format = format
 
 
  def createEditor( self , parent, option, index):
   dateedit = QDateEdit(parent)
   #dateedit=QDateTimeEdit(parent)
   dateedit.setDateRange( self .minimum, self .maximum)
   dateedit.setAlignment(Qt.AlignRight|Qt.AlignVCenter)
   dateedit.setDisplayFormat( self . format )
   dateedit.setCalendarPopup( True )
   return dateedit
 
 
  def setEditorData( self , editor, index):
   value = index.model().data(index, Qt.DisplayRole)
   #if value.isNull:
   editor.setDate(value)
   #editor.setDisplayFormat(self.format)
 
  def setModelData( self , editor, model, index):
   model.setData(index, editor.date())
  def paint( self , painter, option, index):
   text = index.model().data(index, Qt.DisplayRole).toString( self . format )
   palette = QApplication.palette()
   document = QTextDocument()
   document.setDefaultFont(option.font)
   if option.state & QStyle.State_Selected:
    document.setHtml( "<font color={0}>{1}</font>" . format (palette.highlightedText().color().name(),text))
   else :
    document.setHtml(text)
   painter.save()
   color = (palette.highlight().color()
      if option.state & QStyle.State_Selected
      else QColor(index.model().data(index,
         Qt.BackgroundColorRole)))
   painter.fillRect(option.rect, color)
   painter.translate(option.rect.x(), option.rect.y())
   document.drawContents(painter)
   painter.restore() 
 
 
class PlainTextColumnDelegate(QStyledItemDelegate):
 
  def __init__( self , parent = None ):
   super (PlainTextColumnDelegate, self ).__init__(parent)
 
 
  def createEditor( self , parent, option, index):
   lineedit = QLineEdit(parent)
   return lineedit
 
 
  def setEditorData( self , editor, index):
   value = index.model().data(index, Qt.DisplayRole)
   editor.setText(value)
 
 
  def setModelData( self , editor, model, index):
   model.setData(index, editor.text())
 
 
class RichTextColumnDelegate(QStyledItemDelegate):
 
  def __init__( self , parent = None ):
   super (RichTextColumnDelegate, self ).__init__(parent)
 
 
  def paint( self , painter, option, index):
   text = index.model().data(index, Qt.DisplayRole)
   palette = QApplication.palette()
   document = QTextDocument()
   document.setDefaultFont(option.font)
   if option.state & QStyle.State_Selected:
    document.setHtml( "<font color={0}>{1}</font>" . format (palette.highlightedText().color().name(),text))
   else :
    document.setHtml(text)
   painter.save()
   color = (palette.highlight().color()
      if option.state & QStyle.State_Selected
      else QColor(index.model().data(index,
         Qt.BackgroundColorRole)))
   painter.fillRect(option.rect, color)
   painter.translate(option.rect.x(), option.rect.y())
   document.drawContents(painter)
   painter.restore()
 
 
  def sizeHint( self , option, index):
   text = index.model().data(index).toString()
   document = QTextDocument()
   document.setDefaultFont(option.font)
   document.setHtml(text)
   return QSize(document.idealWidth() + 5 ,
       option.fontMetrics.height())
 
 
  def createEditor( self , parent, option, index):
   lineedit = richtextlineedit.RichTextLineEdit(parent)
   return lineedit
 
 
  def setEditorData( self , editor, index):
   value = index.model().data(index, Qt.DisplayRole)
   editor.setHtml(value)
 
 
  def setModelData( self , editor, model, index):
   model.setData(index, editor.toSimpleHtml())

/home/yrd/eric_workspace/chap16/carhirelog.pyw 。

  。

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#!/usr/bin/env python3
 
import bisect
import os
import platform
import sys
from PyQt5.QtCore import (QAbstractTableModel, QDate, QModelIndex,
   QVariant, Qt,pyqtSignal)
from PyQt5.QtWidgets import (QApplication, QMainWindow,
   QShortcut, QTableView)
from PyQt5.QtGui import QKeySequence
import genericdelegates
 
 
(LICENSE, CUSTOMER, HIRED, MILEAGEOUT, RETURNED, MILEAGEBACK,
  NOTES, MILEAGE, DAYS) = range ( 9 )
 
 
class CarHireLog( object ):
 
  def __init__( self , license, customer, hired, mileageout,
      returned = QDate(), mileageback = 0 , notes = ""):
   self .license = license  # plain text
   self .customer = customer # plain text
   self .hired = hired     # QDate
   self .mileageout = mileageout   # int
   self .returned = returned    # QDate
   self .mileageback = mileageback  # int
   self .notes = notes   # HTML
 
 
  def field( self , column):
   if column = = LICENSE:
    return self .license
   elif column = = CUSTOMER:
    return self .customer
   elif column = = HIRED:
    return self .hired
   elif column = = MILEAGEOUT:
    return self .mileageout
   elif column = = RETURNED:
    return self .returned
   elif column = = MILEAGEBACK:
    return self .mileageback
   elif column = = NOTES:
    return self .notes
   elif column = = MILEAGE:
    return self .mileage()
   elif column = = DAYS:
    return self .days()
   assert False
 
 
  def mileage( self ):
   return ( 0 if self .mileageback = = 0
      else self .mileageback - self .mileageout)
 
 
  def days( self ):
   return ( 0 if not self .returned.isValid()
      else self .hired.daysTo( self .returned))
 
 
  def __hash__( self ):
   return super (CarHireLog, self ).__hash__()
 
 
  def __eq__( self , other):
   if self .hired ! = other.hired:
    return False
   if self .customer ! = other.customer:
    return False
   if self .license ! = other.license:
    return False
   return id ( self ) = = id (other)
 
 
  def __lt__( self , other):
   if self .hired < other.hired:
    return True
   if self .customer < other.customer:
    return True
   if self .license < other.license:
    return True
   return id ( self ) < id (other)
 
 
class CarHireModel(QAbstractTableModel):
  dataChanged = pyqtSignal(QModelIndex,QModelIndex)
  def __init__( self , parent = None ):
   super (CarHireModel, self ).__init__(parent)
   self .logs = []
 
   # Generate fake data
   import gzip
   import random
   import string
   surname_data = gzip. open (os.path.join(
     os.path.dirname(__file__), "surnames.txt.gz" )).read()
   surnames = surname_data.decode( "utf8" ).splitlines()
   years = ( "06 " , "56 " , "07 " , "57 " , "08 " , "58 " )
   titles = ( "Ms " , "Mr " , "Ms " , "Mr " , "Ms " , "Mr " , "Dr " )
   notetexts = ( "Returned <font color=red><b>damaged</b></font>" ,
     "Returned with <i>empty fuel tank</i>" ,
     "Customer <b>complained</b> about the <u>engine</u>" ,
     "Customer <b>complained</b> about the <u>gears</u>" ,
     "Customer <b>complained</b> about the <u>clutch</u>" ,
     "Returned <font color=darkred><b>dirty</b></font>" ,)
   today = QDate.currentDate()
   for i in range ( 250 ):
    license = []
    for c in range ( 5 ):
     license.append(random.choice(string.ascii_uppercase))
    license = ("".join(license[: 2 ]) + random.choice(years) +
       "".join(license[ 2 :]))
    customer = random.choice(titles) + random.choice(surnames)
    hired = today.addDays( - random.randint( 0 , 365 ))
    mileageout = random.randint( 10000 , 30000 )
    notes = ""
    if random.random() > = 0.2 :
     days = random.randint( 1 , 21 )
     returned = hired.addDays(days)
     mileageback = (mileageout +
         (days * random.randint( 30 , 300 )))
     if random.random() > 0.75 :
      notes = random.choice(notetexts)
    else :
     returned = QDate()
     mileageback = 0
    log = CarHireLog(license, customer, hired, mileageout,
         returned, mileageback, notes)
    bisect.insort( self .logs, log)
 
 
  def rowCount( self , index = QModelIndex()):
   return len ( self .logs)
 
 
  def columnCount( self , index = QModelIndex()):
   return 9
 
 
  def data( self , index, role):
   if not index.isValid():
    return QVariant()
   if role = = Qt.DisplayRole:
    log = self .logs[index.row()]
    value = log.field(index.column())
    if (index.column() in (MILEAGEBACK, MILEAGE, DAYS) and
     value = = 0 ):
     return 0
    return value
   if (role = = Qt.TextAlignmentRole and
    index.column() not in (LICENSE, CUSTOMER, NOTES)):
    return QVariant( int (Qt.AlignRight|Qt.AlignVCenter))
   if role = = Qt.BackgroundColorRole:
    palette = QApplication.palette()
    if index.column() in (LICENSE, MILEAGE, DAYS):
     return QVariant(palette.alternateBase())
    else :
     return QVariant(palette.base())
   return QVariant()
 
 
  def setData( self , index, value, role = Qt.EditRole):
   if (index.isValid() and role = = Qt.EditRole and
    index.column() not in (LICENSE, MILEAGE, DAYS)):
    log = self .logs[index.row()]
    column = index.column()
    if column = = CUSTOMER:
     log.customer = value
    elif column = = HIRED:
     #log.hired = value.toDate()
     log.hired = value
    elif column = = MILEAGEOUT:
     log.mileageout = value
    elif column = = RETURNED:
     #log.returned = value.toDate()
     log.returned = value
    elif column = = MILEAGEBACK:
     log.mileageback = value
    elif column = = NOTES:
     log.notes = value
    self .dataChanged[QModelIndex,QModelIndex].emit(index,index)
    return True
   return False
 
 
  def headerData( self , section, orientation, role):
   if role = = Qt.TextAlignmentRole:
    if orientation = = Qt.Horizontal:
     return QVariant( int (Qt.AlignCenter))
    return QVariant( int (Qt.AlignRight|Qt.AlignVCenter))
   if role ! = Qt.DisplayRole:
    return QVariant()
   if orientation = = Qt.Horizontal:
    if section = = LICENSE:
     return "License"
    elif section = = CUSTOMER:
     return "Customer"
    elif section = = HIRED:
     return "Hired"
    elif section = = MILEAGEOUT:
     return "Mileage #1"
    elif section = = RETURNED:
     return "Returned"
    elif section = = MILEAGEBACK:
     return "Mileage #2"
    elif section = = DAYS:
     return "Days"
    elif section = = MILEAGE:
     return "Miles"
    elif section = = NOTES:
     return "Notes"
   return section + 1
 
 
  def flags( self , index):
   flag = QAbstractTableModel.flags( self , index)
   if index.column() not in (LICENSE, MILEAGE, DAYS):
    flag | = Qt.ItemIsEditable
   return flag
 
 
class HireDateColumnDelegate(genericdelegates.DateColumnDelegate):
 
  def createEditor( self , parent, option, index):
   i = index.sibling(index.row(), RETURNED)
   self .maximum = i.model().data(i, Qt.DisplayRole).addDays( - 1 )
   return genericdelegates.DateColumnDelegate.createEditor(
     self , parent, option, index)
 
 
class ReturnDateColumnDelegate(genericdelegates.DateColumnDelegate):
 
  def createEditor( self , parent, option, index):
   i = index.sibling(index.row(), HIRED)
   self .minimum = i.model().data(i, Qt.DisplayRole).addDays( 1 )
   return genericdelegates.DateColumnDelegate.createEditor(
     self , parent, option, index)
 
 
class MileageOutColumnDelegate(genericdelegates.IntegerColumnDelegate):
 
  def createEditor( self , parent, option, index):
   i = index.sibling(index.row(), MILEAGEBACK)
   maximum = i.model().data(i, Qt.DisplayRole)
   self .maximum = 1000000 if maximum = = 0 else maximum - 1
   return genericdelegates.IntegerColumnDelegate.createEditor(
     self , parent, option, index)
 
 
class MileageBackColumnDelegate(genericdelegates.IntegerColumnDelegate):
 
  def createEditor( self , parent, option, index):
   i = index.sibling(index.row(), MILEAGEOUT)
   self .minimum = i.model().data(i, Qt.DisplayRole) + 1
   return genericdelegates.IntegerColumnDelegate.createEditor(
     self , parent, option, index)
 
 
class MainForm(QMainWindow):
 
  def __init__( self , parent = None ):
   super (MainForm, self ).__init__(parent)
 
   model = CarHireModel( self )
 
   self .view = QTableView()
   self .view.setModel(model)
   self .view.resizeColumnsToContents()
 
   delegate = genericdelegates.GenericDelegate( self )
   delegate.insertColumnDelegate(CUSTOMER,
     genericdelegates.PlainTextColumnDelegate())
   earliest = QDate.currentDate().addYears( - 3 )
   delegate.insertColumnDelegate(HIRED,
     HireDateColumnDelegate(earliest))
   delegate.insertColumnDelegate(MILEAGEOUT,
     MileageOutColumnDelegate( 0 , 1000000 ))
   delegate.insertColumnDelegate(RETURNED,
     ReturnDateColumnDelegate(earliest))
   delegate.insertColumnDelegate(MILEAGEBACK,
     MileageBackColumnDelegate( 0 , 1000000 ))
   delegate.insertColumnDelegate(NOTES,
     genericdelegates.RichTextColumnDelegate())
 
   self .view.setItemDelegate(delegate)
   self .setCentralWidget( self .view)
 
   QShortcut(QKeySequence( "Escape" ), self , self .close)
   QShortcut(QKeySequence( "Ctrl+Q" ), self , self .close)
 
   self .setWindowTitle( "Car Hire Logs" )
 
 
app = QApplication(sys.argv)
form = MainForm()
rect = QApplication.desktop().availableGeometry()
form.resize( int (rect.width() * 0.7 ), int (rect.height() * 0.8 ))
form.move( 0 , 0 )
form.show()
app.exec_()

运行结果:

python3+PyQt5泛型委托详解

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我.

原文链接：https://blog.csdn.net/xiaoyangyang20/article/details/70257659 。

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