67 lines
1.8 KiB
C++

/*
Gwenview: an image viewer
Copyright 2019 Steffen Hartleib <steffenhartleib@t-online.de>
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 "touch_helper.h"
// Qt
#include "gwenview_lib_debug.h"
#include <QEvent>
#include <QGraphicsWidget>
#include <QPoint>
#include <QTouchEvent>
namespace Gwenview
{
namespace Touch_Helper
{
QPoint simpleTapPosition(QEvent *event)
{
if (event->type() == QEvent::TouchEnd) {
event->accept();
if (touchStationary(event)) {
return simpleTouchPosition(event);
}
}
return QPoint(-1, -1);
}
QPoint simpleTouchPosition(QEvent *event, int at)
{
if (auto touchEvent = static_cast<QTouchEvent *>(event)) {
if (touchEvent->touchPoints().size() > at) {
return touchEvent->touchPoints().at(at).pos().toPoint();
}
}
return QPoint(-1, -1);
}
bool touchStationary(QEvent *event)
{
if (auto touchEvent = static_cast<QTouchEvent *>(event)) {
const QPointF distance = touchEvent->touchPoints().first().startPos() - touchEvent->touchPoints().first().pos();
if (distance.manhattanLength() <= Touch::wiggleRoomForTap) {
return true;
}
}
return false;
}
} // namespace
} // namespace