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 /* ============================================================
 * Falkon - Qt web browser
 * Copyright (C) 2017 David Rosca <nowrep@gmail.com>
 *
 * 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 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * ============================================================ */
 #include "wheelhelper.h"
 
 #include <QWheelEvent>
 
 WheelHelper::WheelHelper()
 = default;
 
 void WheelHelper::reset()
 {
     m_wheelDelta = 0;
     m_directions.clear();
 }
 
 void WheelHelper::processEvent(QWheelEvent *event)
 {
     int delta = event->angleDelta().x() ? event->angleDelta().x() : event->angleDelta().y();
     bool directionY = delta == event->angleDelta().y();
 
     // When scroll to both directions, prefer the major one
     if (event->angleDelta().x() && event->angleDelta().y()) {
         if (qAbs(event->angleDelta().y()) > qAbs(event->angleDelta().x())) {
             delta = event->angleDelta().y();
             directionY = true;
         } else {
             delta = event->angleDelta().x();
             directionY = false;
         }
     }
 
     // Reset when direction changes
     if ((delta < 0 && m_wheelDelta > 0) || (delta > 0 && m_wheelDelta < 0)) {
         m_wheelDelta = 0;
     }
 
     m_wheelDelta += delta;
 
     // Angle delta 120 for common "one click"
     // See: http://qt-project.org/doc/qt-5/qml-qtquick-wheelevent.html#angleDelta-prop
     while (m_wheelDelta >= 120) {
         m_wheelDelta -= 120;
         if (directionY) {
             m_directions.enqueue(WheelUp);
         } else {
             m_directions.enqueue(WheelLeft);
         }
     }
     while (m_wheelDelta <= -120) {
         m_wheelDelta += 120;
         if (directionY) {
             m_directions.enqueue(WheelDown);
         } else {
             m_directions.enqueue(WheelRight);
         }
     }
 }
 
 WheelHelper::Direction WheelHelper::takeDirection()
 {
     return m_directions.isEmpty() ? None : m_directions.dequeue();
 }