/*******************************************************************************
 * gui/common/RSTreeView.cpp                                                   *
 *                                                                             *
 * Copyright (C) 2010 RetroShare Team <retroshare.project@gmail.com>           *
 *                                                                             *
 * This program is free software: you can redistribute it and/or modify        *
 * it under the terms of the GNU Affero General Public License as              *
 * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.                         *
 *                                                                             *
 * You should have received a copy of the GNU Affero General Public License    *
 * along with this program. If not, see <https://www.gnu.org/licenses/>.       *
 *                                                                             *
 *******************************************************************************/

#include <QPainter>
#include <QResizeEvent>
#include "RSTreeView.h"

RSTreeView::RSTreeView(QWidget *parent) : QTreeView(parent)
{
    setMouseTracking(false); // normally the default, but who knows if it's not goign to change in the future.
}

void RSTreeView::wheelEvent(QWheelEvent *e)
{
    if(e->modifiers() == Qt::ControlModifier)
    {
		emit zoomRequested(e->delta() > 0);
        return;
    }
    else
        QTreeView::wheelEvent(e);
}

void RSTreeView::mouseMoveEvent(QMouseEvent *e)
{
    QModelIndex idx = indexAt(e->pos());

    if(idx != selectionModel()->currentIndex())
        selectionModel()->setCurrentIndex(idx,QItemSelectionModel::ClearAndSelect);

    QTreeView::mouseMoveEvent(e);
}

void RSTreeView::setAutoSelect(bool b)
{
    if(b)
		setMouseTracking(true);
    else
		setMouseTracking(false);
}

void RSTreeView::resizeEvent(QResizeEvent *e)
{
    emit sizeChanged(e->size());
}

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

void RSTreeView::paintEvent(QPaintEvent *event)
{
	QTreeView::paintEvent(event);

	if (placeholderText.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, placeholderText);
	}
};