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/*
* ScrollKeeper.cpp
*
* Created on: 30 Oct 2016
* Author: rkfg
*/
#include "ScrollKeeper.h"
#include <QScrollBar>
//#define SCROLL_DEBUG
ScrollKeeper::ScrollKeeper(QWidget *chatView) : chatView_(chatView), scrollPos_(0), scrollToEnd_(false), ted_(nullptr)
{
Q_UNUSED(chatView_)
ted_ = qobject_cast<QTextEdit *>(chatView);
if (ted_) {
scrollPos_ = ted_->verticalScrollBar()->value();
if (scrollPos_ == ted_->verticalScrollBar()->maximum()) {
scrollToEnd_ = true;
}
#ifdef SCROLL_DEBUG
qDebug() << "QTED Scroll pos:" << scrollPos_ << "to end:" << scrollToEnd_
<< "max:" << ted_->verticalScrollBar()->maximum();
#endif
}
}
ScrollKeeper::~ScrollKeeper()
{
if (ted_) {
#ifdef SCROLL_DEBUG
qDebug() << "QTED restoring scroll pos:" << scrollPos_ << "to end:" << scrollToEnd_
<< "max:" << ted_->verticalScrollBar()->maximum();
#endif
ted_->verticalScrollBar()->setValue(scrollToEnd_ ? ted_->verticalScrollBar()->maximum() : scrollPos_);
}
}
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