FreeCAD

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/***************************************************************************
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 *   Copyright (c) 2022 Wanderer Fan <wandererfan@gmail.com>               *
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 *                                                                         *
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 *   This file is part of the FreeCAD CAx development system.              *
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 *                                                                         *
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 *   This library is free software; you can redistribute it and/or         *
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 *   modify it under the terms of the GNU Library General Public           *
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 *   License as published by the Free Software Foundation; either          *
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 *   version 2 of the License, or (at your option) any later version.      *
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 *                                                                         *
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 *   This library  is distributed in the hope that it will be useful,      *
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
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 *   GNU Library General Public License for more details.                  *
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 *                                                                         *
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 *   You should have received a copy of the GNU Library General Public     *
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 *   License along with this library; see the file COPYING.LIB. If not,    *
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 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
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 *   Suite 330, Boston, MA  02111-1307, USA                                *
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 *                                                                         *
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 ***************************************************************************/
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#include "PreCompiled.h"
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#ifndef _PreComp_
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# include <QApplication>
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# include <QGuiApplication>
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# include <QMouseEvent>
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#endif
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#include "QGVNavStyleTouchpad.h"
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#include "QGVPage.h"
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using namespace TechDrawGui;
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namespace TechDrawGui {
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QGVNavStyleTouchpad::QGVNavStyleTouchpad(QGVPage *qgvp) :
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    QGVNavStyle(qgvp)
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{
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}
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QGVNavStyleTouchpad::~QGVNavStyleTouchpad()
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{
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}
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void QGVNavStyleTouchpad::handleKeyPressEvent(QKeyEvent *event)
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{
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    if (event->key() == Qt::Key_PageUp) {
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        zoomIn();
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        event->accept();
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        return;
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    }
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    if (event->key() == Qt::Key_PageDown) {
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        zoomOut();
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        event->accept();
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        return;
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    }
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    QGVNavStyle::handleKeyPressEvent(event);
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}
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void QGVNavStyleTouchpad::handleKeyReleaseEvent(QKeyEvent *event)
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{
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//    Q_UNUSED(event)
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    if (event->key() == Qt::Key_Shift) {
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        if (panningActive) {
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            stopPan();
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        }
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        if (zoomingActive) {
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            stopZoom();
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        }
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        event->accept();
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    }
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    if (event->key() == Qt::Key_Control) {
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        stopZoom();
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        event->accept();
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    }
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}
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void QGVNavStyleTouchpad::handleMouseMoveEvent(QMouseEvent *event)
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{
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    if (getViewer()->isBalloonPlacing()) {
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        balloonCursorMovement(event);
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        return;
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    }
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    if (QApplication::keyboardModifiers() == Qt::ShiftModifier) {
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        //if shift is down then we are panning
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        if (panningActive) {
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            pan(event->pos());
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        } else {
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            startPan(event->pos());
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        }
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        event->accept();
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        return;
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    }
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    if (QGuiApplication::keyboardModifiers().testFlag(Qt::ControlModifier) &&
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        QGuiApplication::keyboardModifiers().testFlag(Qt::ShiftModifier) ) {
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        //if control and shift are down, then we are zooming
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        if (zoomingActive) {
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            zoom(mouseZoomFactor(event->pos()));
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        } else {
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            startZoom(event->pos());
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        }
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        event->accept();
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        return;
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    }
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    // if the mouse moves, but we are not zooming or panning, then we should make
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    // sure that zoom and pan are turned off.
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    stopPan();
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    stopZoom();
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}
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void QGVNavStyleTouchpad::setAnchor()
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{
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    //this navigation style can not anchor under mouse since mouse is moving as part of zoom action
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    if (m_viewer) {
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        m_viewer->setResizeAnchor(QGraphicsView::AnchorViewCenter);
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        m_viewer->setTransformationAnchor(QGraphicsView::AnchorViewCenter);
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    }
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}
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}  //namespace TechDrawGui
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