QTextEdit / QPlainTextEdit 滚动至顶部 / 底部

解决方法一

QTextEdit 与 QPlainTextEdit 均继承自 QAbstractScrollArea。 QAbstractScrollArea 类提供访问滚动条的方法 。

verticalScrollBar();

因此，跳转到顶部，方法如下：

ui->textEdit->verticalScrollBar()->setValue(0);

以及，跳转到底部：

ui->textEdit->verticalScrollBar()->setValue(ui->textEdit->verticalScrollBar()->maximum());

This should work for both QTextEdit and QPlainTextEdit.

原文：

QTextEdit and QPlainTextEdit are both inherited from QAbstractScrollArea. The QAbstractScrollArea object provides access to the scrollbar through the verticalScrollBar() method.

Thus, to jump to the top:

ui.textEdit->verticalScrollBar()->setValue(0);

And to jump to the bottom:

ui.textEdit->verticalScrollBar()->setValue(ui.textEdit->verticalScrollBar()->maximum());

This should work for both QTextEdit and QPlainTextEdit.

解决方法二

TextEdit 控件改变大小时，QWidget::resizeEvent ，会被调用。可以在你的子类中重写此函数，然后调用

verticalScrollBar->setValue(verticalScrollBar->minimum());

或

verticalScrollBar->setValue(verticalScrollBar->maximum());

原文：

When a text edit control is resized, QWidget::resizeEvent is called. You just have to override this function in your subclass, and call verticalScrollBar -> setValue (verticalScrollBar -> minimum()) (or maximum()).

原文链接：
https://9to5answer.com/how-to-program-scrollbar-to-jump-to-bottom-top-in-case-of-change-in-qplaintextedit-or-qtextedit-area