QTextEdit：Tab 键更改项目符号列表缩进

Question

我正在使用 C++ 和 Qt6。我有一个接受富文本的 QTextEdit。当我按 Tab 键时，格式更改为：

我想要的结果是第三颗子弹，但我得到的是第二颗子弹。有什么想法吗？

我已经实现了一个槽，当我的“增加缩进”按钮被调用时它会被调用，它的功能是我想要按 Tab 键实现的：

void SummaryWindow::changeListIndentation(int increment)
{
QTextCursor cursor = ui->textEditor->textCursor();
QTextList *currentList = cursor.currentList();

if(currentList)
{
    QTextListFormat listFormat;
    QTextListFormat::Style currentStyle = currentList->format().style();
    listFormat.setIndent(cursor.currentList()->format().indent() + increment);
    if (currentStyle == QTextListFormat::ListDisc || currentStyle == QTextListFormat::ListCircle || currentStyle == QTextListFormat::ListSquare)
    {
        if (listFormat.indent() == 1){listFormat.setStyle(QTextListFormat::ListDisc);}
        if (listFormat.indent() == 2){listFormat.setStyle(QTextListFormat::ListCircle);}
        if (listFormat.indent() >= 3){listFormat.setStyle(QTextListFormat::ListSquare);}
    }
    if (currentStyle == QTextListFormat::ListDecimal || currentStyle == QTextListFormat::ListUpperAlpha || currentStyle == QTextListFormat::ListLowerAlpha)
    {
        if (listFormat.indent() == 1){listFormat.setStyle(QTextListFormat::ListDecimal);}
        if (listFormat.indent() == 2){listFormat.setStyle(QTextListFormat::ListUpperAlpha);}
        if (listFormat.indent() >= 3){listFormat.setStyle(QTextListFormat::ListLowerAlpha);}
    }
    currentList->setFormat(listFormat);
}
else
{
    QTextBlockFormat blockFormat = cursor.block().blockFormat();
    blockFormat.setIndent( increment == 1 ? blockFormat.indent() + 1 : (blockFormat.indent() == 0 ? 0 : blockFormat.indent() - 1));
    cursor.setBlockFormat(blockFormat);
}
}

Answer 1

bool SummaryWindow::eventFilter(QObject *obj, QEvent *event)
{
    if (obj == ui->textEditor && event->type() == QEvent::KeyPress)
    {

        QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event);
        if (keyEvent->key() == Qt::Key_Tab)
        {
            this->changeListIndentation(1);
            return true;
        }
        else if (keyEvent->key() == Qt::Key_Backtab)
        {
            this->changeListIndentation(-1);
            return true;
        }
    }
        return QMainWindow::eventFilter(obj, event);
}

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