Realize QPlainTextEdit PageUp/Down in code?
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You can trigger a page up/down action like this:
connect(buttonUp, &QPushButton::clicked, [=]{ textEdit->verticalScrollBar()->triggerAction(QAbstractSlider::SliderPageStepSub); }); connect(buttonDown, &QPushButton::clicked, [=]{ textEdit->verticalScrollBar()->triggerAction(QAbstractSlider::SliderPageStepAdd); });