如何在 QtextEdit 中缩进段落

Answer 1

使用QTextBlockFormat.setTextIndent 和QTextCursor.mergeBlockFormat 而不是QTextEdit.setStyleSheet：

    cursor = QTextCursor(self.textEdit.document())
    cursor.select(QTextCursor.Document)
    fmt = QTextBlockFormat()
    fmt.setTextIndent(60)
    cursor.mergeBlockFormat(fmt)

结果：

UPD正如@ВалерияГригорьева 正确指出的那样，在粘贴纯文本时会丢弃缩进（尽管我希望默认实现应该从当前的block 中获取缩进）。因此我们需要覆盖QTextEdit.insertFromMimeData 并在插入时应用缩进：

cursor = self.textCursor()
fmt = QTextBlockFormat()
fmt.setTextIndent(cursor.blockFormat().textIndent())
cursor.mergeBlockFormat(fmt)
cursor.insertText(md.text())

另一方面，对于粘贴富文本，我们不想抑制缩进，因此我们可以依赖QTextEdit.insertFromMimeData 的默认实现。

完整的代码示例（PyQt5）：

import sys
from PyQt5.QtWidgets import QTextEdit, QApplication
from PyQt5.QtGui import QTextDocument, QTextCursor, QTextBlockFormat


class TextEditor(QTextEdit):

    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        # format text edit
        self.setPlainText(
                "Impedit voluptatem sequi quae quo quos. \n" + 
                "Asperiores non repellat culpa nihil. \n" + 
                "Voluptatum ut numquam dolorem molestiae voluptatem " + 
                "est modi necessitatibus. \n" + 
                "Hic rerum voluptas voluptatem. \n" + 
                "Ut expedita unde eum molestias voluptatem aut" + 
                "dignissimos dolor. \n" + 
                "Non illo dolore ut doloremque ut.")
        cursor = QTextCursor(self.document())
        cursor.select(QTextCursor.Document)
        fmt = QTextBlockFormat()
        fmt.setTextIndent(60)
        cursor.mergeBlockFormat(fmt)
        # setup UI
        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('Text indent')
        self.show()

    def insertFromMimeData(self, md):
        # leave processing of the rich text as it is
        if md.hasFormat("application/x-qrichtext") or md.hasHtml():
            super().insertFromMimeData(md)
        else:
            # force indentation from the current block 
            # (shouldn't Qt do this by default, huh?)
            cursor = self.textCursor()
            fmt = QTextBlockFormat()
            fmt.setTextIndent(cursor.blockFormat().textIndent())
            cursor.mergeBlockFormat(fmt)
            cursor.insertText(md.text())


if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = TextEditor()
    sys.exit(app.exec())