consolelineedit.cpp

/****************************************************************************
**
** Copyright (C) 2018 Benjamin Balga
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
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** accordance with the commercial license agreement provided with the
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**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
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****************************************************************************/

#include "consolelineedit.h"

#include <QKeyEvent>

ConsoleLineEdit::ConsoleLineEdit(QWidget *parent) :
    QLineEdit(parent),
    m_maxEntries(20)
{
	connect(this, &QLineEdit::returnPressed, this, &ConsoleLineEdit::addHistoryEntry);
}

// Add current text to history entries, if not empty and different from last entry.
// Called when return key is pressed.
void ConsoleLineEdit::addHistoryEntry()
{
	m_currentEntryIndex = 0;
	const QString currentText = text();

	if (currentText.isEmpty())
		return;

	if (!m_history.isEmpty() && m_history.first() == currentText)
		return;

	m_history.prepend(currentText);
	if (m_history.size() > m_maxEntries)
		m_history.removeLast();
}

// Load a specific history entry: 0 = current, n = n-most last entry
void ConsoleLineEdit::loadHistoryEntry(int entryIndex)
{
	if (entryIndex < 0 || entryIndex > m_history.size())
		return;

	if (m_currentEntryIndex == 0)
		m_editingEntry = text();

	if (entryIndex <= 0 && m_currentEntryIndex > 0) {
		m_currentEntryIndex = 0;
		setText(m_editingEntry);
	} else if (entryIndex > 0) {
		m_currentEntryIndex = entryIndex;
		setText(m_history.at(entryIndex-1));
	}
}

void ConsoleLineEdit::keyPressEvent(QKeyEvent *event)
{
	// Navigate history with up/down keys
	if (event->key() == Qt::Key_Up) {
		loadHistoryEntry(m_currentEntryIndex+1);
		event->accept();
	} else if (event->key() == Qt::Key_Down) {
		loadHistoryEntry(m_currentEntryIndex-1);
		event->accept();
	} else {
		QLineEdit::keyPressEvent(event);
	}
}