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#include "lazyplaintextedit.h"

#include <QScrollBar>

const int INTERVAL = 20;

LazyPlainTextEdit::LazyPlainTextEdit(QWidget *parent) :
    QPlainTextEdit(parent), m_timerId(0)
{
}

void LazyPlainTextEdit::timerEvent(QTimerEvent *event)
{
    if (event->timerId() == m_timerId) {
        killTimer(m_timerId);
        m_timerId = 0;
        m_chachedOutput.chop(1); //removes the last \n
        if (!m_chachedOutput.isEmpty())
            appendPlainText(m_chachedOutput);
        horizontalScrollBar()->setValue( 0 );
        m_chachedOutput.clear();
    }
}

void LazyPlainTextEdit::append(const QString &text)
{
    m_chachedOutput.append(text + QLatin1String("\n"));
    if (isVisible() && m_timerId == 0)
        m_timerId = startTimer(INTERVAL);
}

void LazyPlainTextEdit::clear()
{
    if (m_timerId) {
        killTimer(m_timerId);
        m_timerId = 0;
        m_chachedOutput.clear();
    }
    QPlainTextEdit::clear();
}


void LazyPlainTextEdit::setVisible(bool visible)
{
    if (m_timerId) {
        killTimer(m_timerId);
        m_timerId = 0;
    }
    if (visible) {
        m_timerId = startTimer(INTERVAL);
    }
    QPlainTextEdit::setVisible(visible);
}