CautionSign.cpp

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//  ************************************************************************************************
//
//  BornAgain: simulate and fit reflection and scattering
//
//! @file      GUI/View/Info/CautionSign.cpp
//! @brief     Implements class CautionSign
//!
//! @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/Info/CautionSign.h"
#include "Base/Util/Assert.h"
#include "GUI/View/Info/CautionSignWidget.h"
#include <QAbstractScrollArea>
#include <QEvent>
#include <QScrollBar>
#include <QTimer>
 
namespace {
 
const int xpos_offset = 40;
const int ypos_offset = 40;
 
} // namespace
 
CautionSign::CautionSign(QWidget* parent)
    : QObject(parent)
    , m_caution_header("Houston, we have a problem.")
    , m_cautionWidget(nullptr)
    , m_area(nullptr)
    , m_clear_just_had_happened(false)
{
    setArea(parent);
}
 
//! Clears caution message;
 
void CautionSign::clear()
{
    delete m_cautionWidget;
    m_cautionWidget = nullptr;
    m_caution_message.clear();
 
    m_clear_just_had_happened = true;
    QTimer::singleShot(10, this, [=]() { m_clear_just_had_happened = false; });
}
 
void CautionSign::setCautionHeader(const QString& cautionHeader)
{
    m_caution_header = cautionHeader;
}
 
//! Shows caution sign on the screen. If clear of previous caution sign had happened just
//! few msec ago, make a small delay, to stress its reapearance.
 
void CautionSign::setCautionMessage(const QString& cautionMessage)
{
    ASSERT(m_area);
 
    if (m_clear_just_had_happened) {
        m_clear_just_had_happened = false;
        QTimer::singleShot(50, this, [=]() { setCautionMessage(cautionMessage); });
    } else {
        m_caution_message = cautionMessage;
 
        if (!m_cautionWidget)
            m_cautionWidget = new CautionSignWidget(m_area);
 
        m_cautionWidget->setCautionMessage(m_caution_message);
        updateLabelGeometry();
        m_cautionWidget->show();
    }
}
 
void CautionSign::setArea(QWidget* area)
{
    m_area = area;
    m_area->installEventFilter(this);
}
 
bool CautionSign::isShown() const
{
    return m_cautionWidget != nullptr;
}
 
bool CautionSign::eventFilter(QObject* obj, QEvent* event)
{
    if (event->type() == QEvent::Resize)
        updateLabelGeometry();
 
    return QObject::eventFilter(obj, event);
}
 
void CautionSign::updateLabelGeometry()
{
    if (!m_cautionWidget || !m_area)
        return;
 
    QPoint pos = positionForCautionSign();
    m_cautionWidget->setPosition(pos.x(), pos.y());
}
 
QPoint CautionSign::positionForCautionSign() const
{
    ASSERT(m_area);
 
    int x = m_area->width() - xpos_offset;
    int y = m_area->height() - ypos_offset;
 
    if (auto* scrollArea = dynamic_cast<QAbstractScrollArea*>(m_area)) {
        if (QScrollBar* horizontal = scrollArea->horizontalScrollBar()) {
            if (horizontal->isVisible())
                y -= horizontal->height();
        }
 
        if (QScrollBar* vertical = scrollArea->verticalScrollBar()) {
            if (vertical->isVisible())
                x -= vertical->width();
        }
    }
 
    return QPoint(x, y);
}