使用QTextCursor选择一段文本 [英] Selecting a piece of text using QTextCursor

问题描述

使用Qt框架选择文本时遇到问题。例如，如果我有这个文件：没有时间休息。我想选择ime for r并从文档中删除这一段文字，我应该如何使用QTextCursor？这是我的代码：

Having problems with selecting pieces of text using the Qt framework. For example if i have this document : "No time for rest". And i want to select "ime for r" and delete this piece of text from the document, how should i do it using QTextCursor? Here is my code:

QTextCursor *cursor = new QTextCursor(ui->plainTextEdit->document());
cursor->setPosition(StartPos,QTextCursor::MoveAnchor);
cursor->setPosition(EndPos,QTextCursor::KeepAnchor);
cursor->select(QTextCursor::LineUnderCursor);
cursor->clearSelection();

不幸的是，它会从文本中删除整行。我尝试使用其他选择类型，如WordUnderCursor或BlockUnderCursor，但没有结果。还是有更好的方法吗？提前感谢。

Unfortunately it deletes the whole line from the text. I've tried using other selection types like WordUnderCursor or BlockUnderCursor, but no result. Or maybe there is a better way to do it? Thanks in advance.

推荐答案

您的代码有几个问题：

1. cursor-> select（QTextCursor :: LineUnderCursor）; 行选择整个当前行。你不想删除整行，那么为什么要这样写呢？删除此行代码。


2. clearSelection（）只是取消选择所有内容。 c。使用 removeSelectedText（）。


3. 不要创建 QTextCursor code> new 。这是正确的，但不是必需的。你应该尽可能避免指针。 QTextCursor 通常由值或引用传递。您还可以使用 QPlainTextEdit :: textCursor 获取编辑光标的副本。

1. cursor->select(QTextCursor::LineUnderCursor); line selects whole current line. You don't want to delete whole line, so why would you write this? Remove this line of code.
2. clearSelection() just deselects everything. Use removeSelectedText() instead.
3. Don't create QTextCursor using new. It's correct but not needed. You should avoid pointers when possible. QTextCursor is usually passed by value or reference. Also you can use QPlainText:textCursor to get a copy of the edit cursor.

所以，代码应该像这样：

So, the code should look like that:

QTextCursor cursor = ui->plainTextEdit->textCursor();
cursor.setPosition(StartPos, QTextCursor::MoveAnchor);
cursor.setPosition(EndPos, QTextCursor::KeepAnchor);
cursor.removeSelectedText();

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