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
#!/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
#!/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
#!/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:
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暴雪近日发布了《魔兽世界》10.2.6 更新内容,新游玩模式《强袭风暴》即将于3月21 日在亚服上线,届时玩家将前往阿拉希高地展开一场 60 人大逃杀对战。
艾泽拉斯的冒险者已经征服了艾泽拉斯的大地及遥远的彼岸。他们在对抗世界上最致命的敌人时展现出过人的手腕,并且成功阻止终结宇宙等级的威胁。当他们在为即将于《魔兽世界》资料片《地心之战》中来袭的萨拉塔斯势力做战斗准备时,他们还需要在熟悉的阿拉希高地面对一个全新的敌人──那就是彼此。在《巨龙崛起》10.2.6 更新的《强袭风暴》中,玩家将会进入一个全新的海盗主题大逃杀式限时活动,其中包含极高的风险和史诗级的奖励。
《强袭风暴》不是普通的战场,作为一个独立于主游戏之外的活动,玩家可以用大逃杀的风格来体验《魔兽世界》,不分职业、不分装备(除了你在赛局中捡到的),光是技巧和战略的强弱之分就能决定出谁才是能坚持到最后的赢家。本次活动将会开放单人和双人模式,玩家在加入海盗主题的预赛大厅区域前,可以从强袭风暴角色画面新增好友。游玩游戏将可以累计名望轨迹,《巨龙崛起》和《魔兽世界:巫妖王之怒 经典版》的玩家都可以获得奖励。
