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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file GUI/View/Scene/MaskGraphicsView.cpp
//! @brief Implements class MaskGraphicsView.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#include "GUI/View/Scene/MaskGraphicsView.h"
#include "GUI/View/Scene/MaskGraphicsScene.h"
#include <QScrollBar>
#include <QTransform>
namespace {
const double min_zoom_value = 1.0;
const double max_zoom_value = 5.0;
const double zoom_step = 0.05;
} // namespace
MaskGraphicsView::MaskGraphicsView(MaskGraphicsScene* scene, QWidget* parent)
: QGraphicsView(scene, parent)
, m_scene(scene)
, m_current_zoom_value(1.0)
{
setObjectName("MaskGraphicsView");
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);
setMouseTracking(true);
}
//! Reset given view to original zoom state. Also asks graphics scene to do the same with color map.
void MaskGraphicsView::onResetViewRequest()
{
setZoomValue(1.0);
}
void MaskGraphicsView::wheelEvent(QWheelEvent* event)
{
// hold control button
if (isControlButtonIsPressed(event)) {
centerOn(mapToScene(event->position().toPoint()));
if (event->angleDelta().y() > 0) {
// Zoom in
increaseZoomValue();
} else {
// Zooming out
if (horizontalScrollBar()->isVisible() || verticalScrollBar()->isVisible())
decreaseZoomValue();
}
} else {
QGraphicsView::wheelEvent(event);
}
}
//! On resize event changes scene size and MaskGraphicsProxy so they would get the size of viewport
void MaskGraphicsView::resizeEvent(QResizeEvent* event)
{
QWidget::resizeEvent(event);
m_scene->updateSize(event->size());
}
void MaskGraphicsView::keyPressEvent(QKeyEvent* event)
{
switch (event->key()) {
case Qt::Key_Left:
break;
case Qt::Key_Space:
if (!event->isAutoRepeat())
emit changeActivityRequest(Canvas2DMode::PAN_ZOOM);
break;
case Qt::Key_Escape:
m_scene->cancelCurrentDrawing();
break;
case Qt::Key_Delete:
case Qt::Key_Backspace:
emit deleteCurrentRequest();
break;
default:
QWidget::keyPressEvent(event);
}
}
bool MaskGraphicsView::isControlButtonIsPressed(QWheelEvent* event)
{
return event->modifiers().testFlag(Qt::ControlModifier);
}
void MaskGraphicsView::setZoomValue(double zoom_value)
{
if (zoom_value == m_current_zoom_value)
return;
const QTransform oldMatrix = transform();
resetTransform();
translate(oldMatrix.dx(), oldMatrix.dy());
scale(zoom_value, zoom_value);
m_current_zoom_value = zoom_value;
}
void MaskGraphicsView::decreaseZoomValue()
{
double zoom_value = m_current_zoom_value - zoom_step;
if (zoom_value < min_zoom_value)
zoom_value = min_zoom_value;
setZoomValue(zoom_value);
}
void MaskGraphicsView::increaseZoomValue()
{
double zoom_value = m_current_zoom_value + zoom_step;
if (zoom_value > max_zoom_value)
zoom_value = max_zoom_value;
setZoomValue(zoom_value);
}
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