valentina_old/widgets/vmaingraphicsview.cpp

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/************************************************************************
**
** @file vmaingraphicsview.cpp
** @author Roman Telezhinsky <dismine@gmail.com>
** @date November 15, 2013
**
** @brief
** @copyright
** This source code is part of the Valentine project, a pattern making
** program, whose allow create and modeling patterns of clothing.
** Copyright (C) 2013 Valentina project
** <https://bitbucket.org/dismine/valentina> All Rights Reserved.
**
** Valentina 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.
**
** Valentina 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 Valentina. If not, see <http://www.gnu.org/licenses/>.
**
*************************************************************************/
#include "vmaingraphicsview.h"
VMainGraphicsView::VMainGraphicsView(QWidget *parent)
:QGraphicsView(parent), _numScheduledScalings(0)
{
this->setResizeAnchor(QGraphicsView::AnchorUnderMouse);
this->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
this->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
}
void VMainGraphicsView::wheelEvent(QWheelEvent *event)
{
int numDegrees = event->delta() / 8;
int numSteps = numDegrees / 15; // see QWheelEvent documentation
_numScheduledScalings += numSteps;
if (_numScheduledScalings * numSteps < 0)
{ // if user moved the wheel in another direction, we reset
_numScheduledScalings = numSteps; // previously scheduled scalings
}
QTimeLine *anim = new QTimeLine(350, this);
anim->setUpdateInterval(20);
connect(anim, &QTimeLine::valueChanged, this, &VMainGraphicsView::scalingTime);
connect(anim, &QTimeLine::finished, this, &VMainGraphicsView::animFinished);
anim->start();
}
void VMainGraphicsView::scalingTime(qreal x)
{
Q_UNUSED(x);
qreal factor = 1.0 + static_cast<qreal>(_numScheduledScalings) / 300.0;
if (QApplication::keyboardModifiers() == Qt::ControlModifier)
{// If you press CTRL this code will execute
scale(factor, factor);
emit NewFactor(factor);
}
else
{
if (_numScheduledScalings < 0)
{
verticalScrollBar()->setValue(qRound(verticalScrollBar()->value() + factor*3.5));
emit NewFactor(factor);
}
else
{
if (verticalScrollBar()->value() > 0)
{
verticalScrollBar()->setValue(qRound(verticalScrollBar()->value() - factor*3.5));
emit NewFactor(factor);
}
}
}
}
void VMainGraphicsView::animFinished()
{
if (_numScheduledScalings > 0)
{
_numScheduledScalings--;
}
else
{
_numScheduledScalings++;
}
sender()->~QObject();
}
void VMainGraphicsView::mousePressEvent(QMouseEvent *mousePress)
{
if (mousePress->button() & Qt::LeftButton)
{
switch (QGuiApplication::keyboardModifiers())
{
case Qt::ControlModifier:
QGraphicsView::setDragMode(QGraphicsView::ScrollHandDrag);
QGraphicsView::mousePressEvent(mousePress);
break;
default:
QGraphicsView::mousePressEvent(mousePress);
break;
}
}
}
void VMainGraphicsView::mouseReleaseEvent(QMouseEvent *event)
{
QGraphicsView::mouseReleaseEvent ( event );
QGraphicsView::setDragMode( QGraphicsView::RubberBandDrag );
}