mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-25 09:18:54 -05:00
86 lines
3.3 KiB
C++
86 lines
3.3 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2021 Jon Beniston, M7RCE //
|
|
// //
|
|
// 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 as 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 V3 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 <QMouseEvent>
|
|
#include <QApplication>
|
|
#include <QScrollBar>
|
|
#include <qmath.h>
|
|
|
|
#include "graphicsviewzoom.h"
|
|
|
|
GraphicsViewZoom::GraphicsViewZoom(QGraphicsView* view) :
|
|
QObject(view),
|
|
m_view(view),
|
|
m_modifiers(Qt::NoModifier),
|
|
m_zoomFactorBase(1.0015)
|
|
{
|
|
m_view->viewport()->installEventFilter(this);
|
|
m_view->setMouseTracking(true);
|
|
}
|
|
|
|
void GraphicsViewZoom::gentleZoom(double factor)
|
|
{
|
|
m_view->scale(factor, factor);
|
|
m_view->centerOn(m_targetScenePos);
|
|
QPointF deltaViewportPos = m_targetViewportPos - QPointF(m_view->viewport()->width() / 2.0,
|
|
m_view->viewport()->height() / 2.0);
|
|
QPointF viewportCenter = m_view->mapFromScene(m_targetScenePos) - deltaViewportPos;
|
|
m_view->centerOn(m_view->mapToScene(viewportCenter.toPoint()));
|
|
emit zoomed();
|
|
}
|
|
|
|
void GraphicsViewZoom::setModifiers(Qt::KeyboardModifiers modifiers)
|
|
{
|
|
m_modifiers = modifiers;
|
|
}
|
|
|
|
void GraphicsViewZoom::setZoomFactorBase(double value)
|
|
{
|
|
m_zoomFactorBase = value;
|
|
}
|
|
|
|
bool GraphicsViewZoom::eventFilter(QObject *object, QEvent *event)
|
|
{
|
|
if (event->type() == QEvent::MouseMove)
|
|
{
|
|
QMouseEvent* mouseEvent = static_cast<QMouseEvent*>(event);
|
|
QPointF delta = m_targetViewportPos - mouseEvent->pos();
|
|
if (qAbs(delta.x()) > 5 || qAbs(delta.y()) > 5)
|
|
{
|
|
m_targetViewportPos = mouseEvent->pos();
|
|
m_targetScenePos = m_view->mapToScene(mouseEvent->pos());
|
|
}
|
|
}
|
|
else if (event->type() == QEvent::Wheel)
|
|
{
|
|
QWheelEvent* wheelEvent = static_cast<QWheelEvent*>(event);
|
|
if (QApplication::keyboardModifiers() == m_modifiers)
|
|
{
|
|
if (wheelEvent->orientation() == Qt::Vertical)
|
|
{
|
|
double angle = wheelEvent->angleDelta().y();
|
|
double factor = qPow(m_zoomFactorBase, angle);
|
|
gentleZoom(factor);
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
Q_UNUSED(object)
|
|
return false;
|
|
}
|