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 python3import platformimport sysimport htmlfrom PyQt5.QtGui import QColor, QFont,QFontMetrics, QIcon, QKeySequence, QPixmap,QTextCharFormatfrom PyQt5.QtWidgets import QAction,QApplication,QMenu,QTextEditclass 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 htmltextif __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 python3from PyQt5.QtCore import (QDate, QSize, Qt)from PyQt5.QtWidgets import (QApplication, QDateEdit, QLineEdit, QSpinBox, QStyledItemDelegate,QStyle)from PyQt5.QtGui import QColor,QTextDocumentimport richtextlineeditclass 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 python3import bisectimport osimport platformimport sysfrom PyQt5.QtCore import (QAbstractTableModel, QDate, QModelIndex, QVariant, Qt,pyqtSignal)from PyQt5.QtWidgets import (QApplication, QMainWindow, QShortcut, QTableView)from PyQt5.QtGui import QKeySequenceimport 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 flagclass 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：
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服务器之家。
原文链接：https://blog.csdn.net/xiaoyangyang20/article/details/70257659
