python - 如何在 PyQt5 中调用或激活 MenuBar 快捷方式？
问题描述
这是代码（复制并粘贴表格 baoa - Github 的菜单 PyQt5）。任何菜单中的快捷键都不起作用？
如何纠正这种情况？
如何激活此快捷键操作？大多数教程都无法给出解决方案？有没有人给出一个实际的解决方案？仅使用 ALT 键，如果我按 Cntrl 键序列，则不会发生任何事情。
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QKeySequence
from PyQt5.QtWidgets import (QAction, QActionGroup, QApplication, QFrame,
QLabel, QMainWindow, QMenu, QMessageBox, QSizePolicy, QVBoxLayout,
QWidget)
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
widget = QWidget()
self.setCentralWidget(widget)
topFiller = QWidget()
topFiller.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
self.infoLabel = QLabel(
"<i>Choose a menu option, or right-click to invoke a context menu</i>",
alignment=Qt.AlignCenter)
self.infoLabel.setFrameStyle(QFrame.StyledPanel | QFrame.Sunken)
bottomFiller = QWidget()
bottomFiller.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
vbox = QVBoxLayout()
vbox.setContentsMargins(5, 5, 5, 5)
vbox.addWidget(topFiller)
vbox.addWidget(self.infoLabel)
vbox.addWidget(bottomFiller)
widget.setLayout(vbox)
self.createActions()
self.createMenus()
message = "A context menu is available by right-clicking"
self.statusBar().showMessage(message)
self.setWindowTitle("Menus")
self.setMinimumSize(160 ,160)
self.resize(480 ,320)
def contextMenuEvent(self, event):
menu = QMenu(self)
menu.addAction(self.cutAct)
menu.addAction(self.copyAct)
menu.addAction(self.pasteAct)
menu.exec_(event.globalPos())
def newFile(self):
self.infoLabel.setText("Invoked <b>File|New</b>")
def open(self):
self.infoLabel.setText("Invoked <b>File|Open</b>")
def save(self):
self.infoLabel.setText("Invoked <b>File|Save</b>")
def print_(self):
self.infoLabel.setText("Invoked <b>File|Print</b>")
def undo(self):
self.infoLabel.setText("Invoked <b>Edit|Undo</b>")
def redo(self):
self.infoLabel.setText("Invoked <b>Edit|Redo</b>")
def cut(self):
self.infoLabel.setText("Invoked <b>Edit|Cut</b>")
def copy(self):
self.infoLabel.setText("Invoked <b>Edit|Copy</b>")
def paste(self):
self.infoLabel.setText("Invoked <b>Edit|Paste</b>")
def bold(self):
self.infoLabel.setText("Invoked <b>Edit|Format|Bold</b>")
def italic(self):
self.infoLabel.setText("Invoked <b>Edit|Format|Italic</b>")
def leftAlign(self):
self.infoLabel.setText("Invoked <b>Edit|Format|Left Align</b>")
def rightAlign(self):
self.infoLabel.setText("Invoked <b>Edit|Format|Right Align</b>")
def justify(self):
self.infoLabel.setText("Invoked <b>Edit|Format|Justify</b>")
def center(self):
self.infoLabel.setText("Invoked <b>Edit|Format|Center</b>")
def setLineSpacing(self):
self.infoLabel.setText("Invoked <b>Edit|Format|Set Line Spacing</b>")
def setParagraphSpacing(self):
self.infoLabel.setText("Invoked <b>Edit|Format|Set Paragraph Spacing</b>")
def about(self):
self.infoLabel.setText("Invoked <b>Help|About</b>")
QMessageBox.about(self, "About Menu",
"The <b>Menu</b> example shows how to create menu-bar menus "
"and context menus.")
def aboutQt(self):
self.infoLabel.setText("Invoked <b>Help|About Qt</b>")
def createActions(self):
self.newAct = QAction("&New", self, shortcut=QKeySequence.New,
statusTip="Create a new file", triggered=self.newFile)
self.openAct = QAction("&Open...", self, shortcut=QKeySequence.Open,
statusTip="Open an existing file", triggered=self.open)
self.saveAct = QAction("&Save", self, shortcut=QKeySequence.Save,
statusTip="Save the document to disk", triggered=self.save)
self.printAct = QAction("&Print...", self, shortcut=QKeySequence.Print,
statusTip="Print the document", triggered=self.print_)
self.exitAct = QAction("E&xit", self, shortcut="Ctrl+Q",statusTip="Exit the application", triggered=self.close)
self.undoAct = QAction("&Undo", self, shortcut=QKeySequence.Undo,statusTip="Undo the last operation", triggered=self.undo)
self.redoAct = QAction("&Redo", self, shortcut=QKeySequence.Redo,
statusTip="Redo the last operation", triggered=self.redo)
self.cutAct = QAction("Cu&t", self, shortcut=QKeySequence.Cut,
statusTip="Cut the current selection's contents to the clipboard",
triggered=self.cut)
self.copyAct = QAction("&Copy", self, shortcut=QKeySequence.Copy,
statusTip="Copy the current selection's contents to the clipboard",
triggered=self.copy)
self.pasteAct = QAction("&Paste", self, shortcut=QKeySequence.Paste,
statusTip="Paste the clipboard's contents into the current selection",
triggered=self.paste)
self.boldAct = QAction("&Bold", self, checkable=True,
shortcut="Ctrl+B", statusTip="Make the text bold",
triggered=self.bold)
boldFont = self.boldAct.font()
boldFont.setBold(True)
self.boldAct.setFont(boldFont)
self.italicAct = QAction("&Italic", self, checkable=True,
shortcut="Ctrl+I", statusTip="Make the text italic",
triggered=self.italic)
italicFont = self.italicAct.font()
italicFont.setItalic(True)
self.italicAct.setFont(italicFont)
self.setLineSpacingAct = QAction("Set &Line Spacing...", self,
statusTip="Change the gap between the lines of a paragraph",
triggered=self.setLineSpacing)
self.setParagraphSpacingAct = QAction("Set &Paragraph Spacing...",
self, statusTip="Change the gap between paragraphs",
triggered=self.setParagraphSpacing)
self.aboutAct = QAction("&About", self,
statusTip="Show the application's About box",
triggered=self.about)
self.aboutQtAct = QAction("About &Qt", self,
statusTip="Show the Qt library's About box",
triggered=self.aboutQt)
self.aboutQtAct.triggered.connect(QApplication.instance().aboutQt)
self.leftAlignAct = QAction("&Left Align", self, checkable=True,
shortcut="Ctrl+L", statusTip="Left align the selected text",
triggered=self.leftAlign)
self.rightAlignAct = QAction("&Right Align", self, checkable=True,
shortcut="Ctrl+R", statusTip="Right align the selected text",
triggered=self.rightAlign)
self.justifyAct = QAction("&Justify", self, checkable=True,
shortcut="Ctrl+J", statusTip="Justify the selected text",
triggered=self.justify)
self.centerAct = QAction("&Center", self, checkable=True,
shortcut="Ctrl+C", statusTip="Center the selected text",
triggered=self.center)
self.alignmentGroup = QActionGroup(self)
self.alignmentGroup.addAction(self.leftAlignAct)
self.alignmentGroup.addAction(self.rightAlignAct)
self.alignmentGroup.addAction(self.justifyAct)
self.alignmentGroup.addAction(self.centerAct)
self.leftAlignAct.setChecked(True)
def createMenus(self):
self.fileMenu = self.menuBar().addMenu("&File")
self.fileMenu.addAction(self.newAct)
self.fileMenu.addAction(self.openAct)
self.fileMenu.addAction(self.saveAct)
self.fileMenu.addAction(self.printAct)
self.fileMenu.addSeparator()
self.fileMenu.addAction(self.exitAct)
self.editMenu = self.menuBar().addMenu("&Edit")
self.editMenu.addAction(self.undoAct)
self.editMenu.addAction(self.redoAct)
self.editMenu.addSeparator()
self.editMenu.addAction(self.cutAct)
self.editMenu.addAction(self.copyAct)
self.editMenu.addAction(self.pasteAct)
self.editMenu.addSeparator()
self.helpMenu = self.menuBar().addMenu("&Help")
self.helpMenu.addAction(self.aboutAct)
self.helpMenu.addAction(self.aboutQtAct)
self.formatMenu = self.editMenu.addMenu("&Format")
self.formatMenu.addAction(self.boldAct)
self.formatMenu.addAction(self.italicAct)
self.formatMenu.addSeparator().setText("Alignment")
self.formatMenu.addAction(self.leftAlignAct)
self.formatMenu.addAction(self.rightAlignAct)
self.formatMenu.addAction(self.justifyAct)
self.formatMenu.addAction(self.centerAct)
self.formatMenu.addSeparator()
self.formatMenu.addAction(self.setLineSpacingAct)
self.formatMenu.addAction(self.setParagraphSpacingAct)
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
解决方案
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