ConstrainedNumericSpinBox.hpp

#pragma once
#include <Gui/RaGui.hpp>
 
#include <QWidget>
 
#include <Gui/Widgets/QtTypeWrapper.hpp>
 
namespace Ra {
namespace Gui {
namespace Widgets {
 
template <typename T>
class ConstrainedNumericSpinBox : public QtSpinBox::getType<T>::Type
{
  public:
    using BaseWidget = typename QtSpinBox::getType<T>::Type;
    using Predicate  = std::function<bool( T )>;
    using BaseWidget::BaseWidget;
    QValidator::State validate( QString& input, int& ) const override;
 
    inline void setPredicate( Predicate p ) { m_p = p; }
    inline bool isValid( T s ) const { return m_p( s ); }
 
  private:
    Predicate m_p = []( T ) { return true; };
};
 
template <typename T>
QValidator::State ConstrainedNumericSpinBox<T>::validate( QString& input, int& ) const {
    auto valid = this->isValid( this->valueFromText( input ) );
    auto& spin = const_cast<ConstrainedNumericSpinBox&>( *this );
    spin.blockSignals( !valid );
    if ( valid ) { spin.setStyleSheet( "" ); }
    else { spin.setStyleSheet( "background-color: #FF8080" ); }
    return valid ? QValidator::Acceptable : QValidator::Invalid;
}
 
} // namespace Widgets
} // namespace Gui
} // namespace Ra