RetroShare/retroshare-gui/src/gui/common/RSTreeWidget.cpp

/****************************************************************
 * This file is distributed under the following license:
 *
 * Copyright (c) 2012, RetroShare Team
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  of the License, or (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, 
 *  Boston, MA  02110-1301, USA.
 ****************************************************************/

#include <QPainter>
#include <QMouseEvent>

#include "RSTreeWidget.h"

RSTreeWidget::RSTreeWidget(QWidget *parent) : QTreeWidget(parent)
{
}

void RSTreeWidget::setPlaceholderText(const QString &text)
{
	mPlaceholderText = text;
	viewport()->repaint();
}

void RSTreeWidget::paintEvent(QPaintEvent *event)
{
	QTreeWidget::paintEvent(event);

	if (mPlaceholderText.isEmpty() == false && model() && model()->rowCount() == 0) {
		QWidget *vieportWidget = viewport();
		QPainter painter(vieportWidget);

		QPen pen = painter.pen();
		QColor color = pen.color();
		color.setAlpha(128);
		pen.setColor(color);
		painter.setPen(pen);

		painter.drawText(QRect(QPoint(), vieportWidget->size()), Qt::AlignHCenter | Qt::AlignVCenter | Qt::TextWordWrap, mPlaceholderText);
	}
}

void RSTreeWidget::mousePressEvent(QMouseEvent *event)
{
	if (event->buttons() & Qt::MiddleButton) {
		if (receivers(SIGNAL(signalMouseMiddleButtonClicked(QTreeWidgetItem*))) > 0) {
			QTreeWidgetItem *item = itemAt(event->pos());
			if (item) {
				setCurrentItem(item);
				emit signalMouseMiddleButtonClicked(item);
			}
			return; // eat event
		}
	}

	QTreeWidget::mousePressEvent(event);
}