97 lines
3.5 KiB
C++
97 lines
3.5 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Valentina project All Rights Reserved.
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**
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** This file is part of Valentina.
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**
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** Tox is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** Tox 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 General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with Valentina. If not, see <http://www.gnu.org/licenses/>.
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**
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****************************************************************************/
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#include "vmaingraphicsview.h"
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#include <QApplication>
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#include <QWheelEvent>
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#include <QScrollBar>
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#include <QTimeLine>
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VMainGraphicsView::VMainGraphicsView(QWidget *parent) :
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QGraphicsView(parent), _numScheduledScalings(0){
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this->setResizeAnchor(QGraphicsView::AnchorUnderMouse);
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this->setTransformationAnchor(QGraphicsView::AnchorUnderMouse);
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this->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
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}
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void VMainGraphicsView::wheelEvent(QWheelEvent *event){
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int numDegrees = event->delta() / 8;
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int numSteps = numDegrees / 15; // see QWheelEvent documentation
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_numScheduledScalings += numSteps;
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if (_numScheduledScalings * numSteps < 0){ // if user moved the wheel in another direction, we reset
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_numScheduledScalings = numSteps; // previously scheduled scalings
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}
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QTimeLine *anim = new QTimeLine(350, this);
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anim->setUpdateInterval(20);
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connect(anim, &QTimeLine::valueChanged, this, &VMainGraphicsView::scalingTime);
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connect(anim, &QTimeLine::finished, this, &VMainGraphicsView::animFinished);
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anim->start();
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}
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void VMainGraphicsView::scalingTime(qreal x){
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Q_UNUSED(x);
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qreal factor = 1.0 + qreal(_numScheduledScalings) / 300.0;
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if (QApplication::keyboardModifiers() == Qt::ControlModifier){// If you press CTRL this code will execute
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scale(factor, factor);
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emit NewFactor(factor);
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} else {
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if(_numScheduledScalings < 0){
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verticalScrollBar()->setValue(qRound(verticalScrollBar()->value() + factor*3.5));
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emit NewFactor(factor);
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} else {
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if(verticalScrollBar()->value() > 0){
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verticalScrollBar()->setValue(qRound(verticalScrollBar()->value() - factor*3.5));
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emit NewFactor(factor);
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}
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}
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}
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}
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void VMainGraphicsView::animFinished(){
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if (_numScheduledScalings > 0){
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_numScheduledScalings--;
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} else {
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_numScheduledScalings++;
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}
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sender()->~QObject();
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}
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void VMainGraphicsView::mousePressEvent(QMouseEvent *mousePress){
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if(mousePress->button() & Qt::LeftButton){
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switch(QGuiApplication::keyboardModifiers()){
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case Qt::ControlModifier:
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QGraphicsView::setDragMode(QGraphicsView::ScrollHandDrag);
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QGraphicsView::mousePressEvent(mousePress);
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break;
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default:
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QGraphicsView::mousePressEvent(mousePress);
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break;
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}
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}
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}
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void VMainGraphicsView::mouseReleaseEvent(QMouseEvent *event){
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QGraphicsView::mouseReleaseEvent ( event );
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QGraphicsView::setDragMode( QGraphicsView::RubberBandDrag );
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}
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