Question

我有一个文本编辑器，可以将拉丁语键盘按键转换为俄语字符。我重新实现了一个QTextEdit类：

class MyTextEdit(QTextEdit):
def __init__(self, *args):
    QTextEdit.__init__(self, *args)

leftMousePressedSignal = pyqtSignal(QPoint)
rightMousePressedSignal = pyqtSignal(QPoint, QEvent)
mouseMovedSignal = pyqtSignal(QPoint)
mouseDoubleClickedSignal = pyqtSignal(QPoint)
keyPressedSignal = pyqtSignal(QEvent)

def mousePressEvent(self, event):
    pos = event.pos()
    if event.button() == Qt.LeftButton:
        self.leftMousePressedSignal.emit(pos)
    elif event.button() == Qt.RightButton:
        self.rightMousePressedSignal.emit(pos, event)

def mouseMoveEvent(self, event):
    if event.buttons() & Qt.LeftButton:
        pos = event.pos()
        self.mouseMovedSignal.emit(pos)

def mouseDoubleClickEvent(self, event):
    if event.button() == Qt.LeftButton:
        pos = event.pos()
        self.mouseDoubleClickedSignal.emit(pos)

def keyPressEvent(self, event):
    if event.type() == QEvent.KeyPress:
        self.keyPressedSignal.emit(event)

然后我使用重新实现的keyPressEvent。所以我不得不重新实现Backspace操作：

    self.textEdit = MyTextEdit(self)
    ...
    self.textEdit.keyPressedSignal.connect(self.OnKeyPressed)
    self.actionSelectAll.triggered.connect(self.textEdit.selectAll)
    ...

def OnKeyPressed(self, event):
    key = event.key()
    txt = str(event.text())
    if key == Qt.Key_Backspace:
        if self.cursor.hasSelection():
            self.cursor.movePosition(QTextCursor.NoMove, QTextCursor.KeepAnchor, self.cursor.selectionStart() - self.cursor.selectionStart())
        else:
            self.cursor.movePosition(QTextCursor.PreviousCharacter, QTextCursor.KeepAnchor, 1)
        self.textEdit.setTextCursor(self.cursor)
        self.textEdit.cut()
    elif key == Qt.Key_A and (event.modifiers() & Qt.ControlModifier):
        self.textEdit.selectAll()

现在，如果没有选择任何内容并按Backspace，它会删除光标左侧的单个字符。当用鼠标选择一个单词并按Backspace时，它会删除该单词。当用鼠标选择几个单词或整个文本并按Backspace时，它会删除整个选择。所以，它工作正常。当我按下全选按钮（或Ctrl + A）时 - 它会选择整个文本。但是如果我按Backspace它只删除光标左边的1个字符，而不是整个文本。

如果你冷酷地告诉我这里我做错了什么，我将非常感激。谢谢。

Answer 1

为什么要重新选择和删除行为，以及为什么不在MyTextEdit中完成？如果你只是需要

将拉丁语键盘按键转换为俄语字符

您只能执行此转换，并让其他工作（选择，退出，复制等）QTextEdit。

我会这样写：

class TransliterationEdit(QTextEdit):
    latin_alphabet = unicode(string.ascii_letters)  # or dict with transliteration table

    def translateLetter(self, letter):
        return u'Ъ'  # just example, you need translate letter somehow

    def keyPressEvent(self, event):
        text = unicode(event.text())
        if text and text in self.latin_alphabet:
            self.insertPlainText(self.translateLetter(text))
            event.ignore()
        else:
            QTextEdit.keyPressEvent(self, event)

<强>更新

这是我TextEdit的粗略实现，它将拉丁语按键转换为俄语字符，希望它有所帮助。

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
from PyQt4.QtGui import *
from transliterator import SMTransliterator
# transliterator available at https://gist.github.com/1600988


class TransliterationEdit(QTextEdit):

    def __init__(self, *args, **kwargs):
        QTextEdit.__init__(self, *args, **kwargs)
        self._transliterator = SMTransliterator()

    def keyPressEvent(self, event):
        text = unicode(event.text())

        if not self._transliterator.add_letter(text):
            if text and self._transliterator.result:
                self.insertPlainText(self._transliterator.result)
            return QTextEdit.keyPressEvent(self, event)

        if self._transliterator.need_next:
            return  # skip it

        self.insertPlainText(self._transliterator.result)


if __name__ == '__main__':      
    app = QApplication(sys.argv)
    window = TransliterationEdit()
    window.show()
    sys.exit(app.exec_())

音译器位于gist

PyQt - sellectAll然后Backspace删除不起作用

1 个答案: