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105 lines (84 loc) · 2.79 KB
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/**********************************************************************
Audacity: A Digital Audio Editor
AudacityException
Paul Licameli
********************************************************************//**
\class AudacityException
\brief root of a hierarchy of classes that are thrown and caught
by Audacity.
\class MessageBoxException
\brief an AudacityException that pops up a single message box even if
there were multiple exceptions of the same kind before it actually
got to show.
*//********************************************************************/
#include "Audacity.h"
#include "AudacityException.h"
#include <wx/atomic.h>
#include "widgets/ErrorDialog.h"
AudacityException::~AudacityException()
{
}
wxAtomicInt sOutstandingMessages {};
MessageBoxException::MessageBoxException( const wxString &caption_ )
: caption{ caption_ }
{
if (!caption.empty())
wxAtomicInc( sOutstandingMessages );
else
// invalidate me
moved = true;
}
// The class needs a copy constructor to be throwable
// (or will need it, by C++14 rules). But the copy
// needs to act like a move constructor. There must be unique responsibility
// for each exception thrown to decrease the global count when it is handled.
MessageBoxException::MessageBoxException( const MessageBoxException& that )
{
caption = that.caption;
moved = that.moved;
that.moved = true;
}
MessageBoxException &MessageBoxException::operator = ( MessageBoxException &&that )
{
caption = that.caption;
if ( this != &that ) {
AudacityException::operator=( std::move(that) );
if (!moved)
wxAtomicDec( sOutstandingMessages );
moved = that.moved;
that.moved = true;
}
return *this;
}
MessageBoxException::~MessageBoxException()
{
if (!moved)
// If exceptions are used properly, you should never reach this,
// because moved should become true earlier in the object's lifetime.
wxAtomicDec( sOutstandingMessages );
}
SimpleMessageBoxException::~SimpleMessageBoxException()
{
}
wxString SimpleMessageBoxException::ErrorMessage() const
{
return message;
}
// This is meant to be invoked via wxEvtHandler::CallAfter
void MessageBoxException::DelayedHandlerAction()
{
if (!moved) {
// This test prevents accumulation of multiple messages between idle
// times of the main even loop. Only the last queued exception
// displays its message. We assume that multiple messages have a
// common cause such as exhaustion of disk space so that the others
// give the user no useful added information.
if ( wxAtomicDec( sOutstandingMessages ) == 0 )
::AudacityMessageBox(
ErrorMessage(),
caption.IsEmpty() ? AudacityMessageBoxCaptionStr() : caption,
wxICON_ERROR
);
moved = true;
}
}