python3+PyQt5泛型委托的示例分析-創(chuàng)新互聯(lián)
這篇文章給大家分享的是有關(guān)python3+PyQt5泛型委托的示例分析的內(nèi)容。小編覺得挺實(shí)用的，因此分享給大家做個(gè)參考，一起跟隨小編過來看看吧。
自定義委托可以讓我們對視圖中出現(xiàn)的數(shù)據(jù)項(xiàng)的外觀和行為進(jìn)行完全控制。如果有很多模型，可能會(huì)希望不是全部的大多數(shù)模型能夠僅用一個(gè)自定義委托，如果不能這么做，那么對于這些自定義委托，將很有可能存在大量重復(fù)代碼。為了使得維護(hù)工作變得輕松，更好的方法為不要為每個(gè)模型創(chuàng)建一個(gè)自定義委托，而是用一系列的通用組件來共同構(gòu)成一個(gè)委托。本文通過Python3+pyqt5實(shí)現(xiàn)了python Qt GUI 快速編程的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 Ctrl+M for the text effects "
"menu and Ctrl+K 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 = "{0}".format(text)
elif (format.verticalAlignment() ==
QTextCharFormat.AlignSuperScript):
text = "{0}".format(text)
if format.fontUnderline():
text = "{0}".format(text)
if format.fontItalic():
text = "{0}".format(text)
if format.fontWeight() > QFont.Normal:
text = "{0}".format(text)
if format.fontStrikeOut():
text = "{0}".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 = "{1}".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("{1}".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("{1}".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 damaged",
"Returned with empty fuel tank",
"Customer complained about the engine",
"Customer complained about the gears",
"Customer complained about the clutch",
"Returned dirty",)
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_() 運(yùn)行結(jié)果：
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