Differential D13901 Diff 53070 lib/touch/touch_helper.cpp

Changeset View

Standalone View

lib/touch/touch_helper.cpp

This file was added.

		1		/*
		2		Gwenview: an image viewer
		3		Copyright 2019 Steffen Hartleib <steffenhartleib@t-online.de>
		4
		5		This program is free software; you can redistribute it and/or
		6		modify it under the terms of the GNU General Public License
		7		as published by the Free Software Foundation; either version 2
		8		of the License, or (at your option) any later version.
		9
		10		This program is distributed in the hope that it will be useful,
		11		but WITHOUT ANY WARRANTY; without even the implied warranty of
		12		MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		13		GNU General Public License for more details.
		14
		15		You should have received a copy of the GNU General Public License
		16		along with this program; if not, write to the Free Software
		17		Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
		18
		19		*/
		20		#include "touch_helper.h"
		21
		22		// Qt
		23		#include <QEvent>
		24		#include <QPoint>
		25		#include <QTouchEvent>
		26		#include <QGraphicsWidget>
		27		#include <QCoreApplication>
		28		#include <QDebug>
		29
		30
		31		namespace Gwenview
		32		{
		33		namespace Touch_Helper
		34		{
		35
		36		QPoint simpleTapPosition (QEvent* event)
		37		{
		38		if (event->type() == QEvent::TouchEnd) {
		39		event->accept();
		40		if (touchStationary(event)) {
		41		return simpleTouchPosition(event);
		42		}
		43		}
		44		return QPoint(-1, -1);
		45		}
		46
		47		QPoint simpleTouchPosition(QEvent* event, int at)
		48		{
		49		if (QTouchEvent* touchEvent = static_cast<QTouchEvent*>(event)) {
		50		if (touchEvent->touchPoints().size() > at) {
		51		return touchEvent->touchPoints().at(at).pos().toPoint();
		52		}
		53		}
		54		return QPoint(-1, -1);
		55		}
		56
		57		bool touchStationary(QEvent* event)
		58		{
		59		if (QTouchEvent* touchEvent = static_cast<QTouchEvent*>(event)) {
		60		const QPointF distance = touchEvent->touchPoints().first().startPos() - touchEvent->touchPoints().first().pos();
		61		if (distance.manhattanLength() <= Touch::wiggleRoomForTap) {
		62		return true;
		63		}
		64		}
		65		return false;
		66		}
		67
		68		} // namespace
		69		} // namespace