From 408ab3fea50a9cbb8ff8fc5ee9bfb10d09f8cbdb Mon Sep 17 00:00:00 2001
From: Tobias Doerffel <tobias.doerffel@gmail.com>
Date: Sun, 7 Sep 2008 12:54:23 +0000
Subject: [PATCH] display message if project is empty and user tries to export
 it (closes #2091056)

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1571 0778d3d1-df1d-0410-868b-ea421aaaa00d
---
 ChangeLog                    |  6 ++++++
 include/track_container.h    |  5 ++++-
 src/core/song.cpp            | 10 ++++++++++
 src/core/track_container.cpp | 34 ++++++++++++++++++++++++----------
 src/gui/main_window.cpp      |  2 +-
 5 files changed, 45 insertions(+), 12 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index f73ae1f65..a24813297 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2008-09-07	Tobias Doerffel	<tobydox/at/users/dot/sourceforge/dot/net>
 
+	* include/track_container.h:
+	* src/core/song.cpp:
+	* src/core/track_container.cpp:
+	display message if project is empty and user tries to export
+	it (closes #2091056)
+
 	* src/core/song.cpp:
 	- fixed freeze after adding BB-tracks (closes #2089337)
 	- replaced bad cast for calling projectNotes::save/restoreState by
diff --git a/include/track_container.h b/include/track_container.h
index 0914fb423..2e02635e9 100644
--- a/include/track_container.h
+++ b/include/track_container.h
@@ -60,10 +60,11 @@ public:
 	int countTracks( track::TrackTypes _tt = track::NumTrackTypes ) const;
 
 
-	virtual void updateAfterTrackAdd( void );
 	void addTrack( track * _track );
 	void removeTrack( track * _track );
 
+	virtual void updateAfterTrackAdd( void );
+
 	void clearAllTracks( void );
 
 	const trackList & tracks( void ) const
@@ -71,6 +72,8 @@ public:
 		return( m_tracks );
 	}
 
+	bool isEmpty( void ) const;
+
 	static const QString classNodeName( void )
 	{
 		return( "trackcontainer" );
diff --git a/src/core/song.cpp b/src/core/song.cpp
index d2d6f7bca..6a2013b24 100644
--- a/src/core/song.cpp
+++ b/src/core/song.cpp
@@ -1110,6 +1110,16 @@ void song::restoreControllerStates( const QDomElement & _this )
 
 void song::exportProject( void )
 {
+	if( isEmpty() )
+	{
+		QMessageBox::information( engine::getMainWindow(),
+				tr( "Empty project" ),
+				tr( "This project is empty so exporting makes "
+					"no sense. Please put some items into "
+					"Song Editor first!" ) );
+		return;
+	}
+
 	QString base_filename;
 
 	if( m_fileName != "" )
diff --git a/src/core/track_container.cpp b/src/core/track_container.cpp
index 465fec5b2..dfc9ca2b6 100644
--- a/src/core/track_container.cpp
+++ b/src/core/track_container.cpp
@@ -130,6 +130,24 @@ void trackContainer::loadSettings( const QDomElement & _this )
 
 
 
+int trackContainer::countTracks( track::TrackTypes _tt ) const
+{
+	int cnt = 0;
+	m_tracksMutex.lockForRead();
+	for( int i = 0; i < m_tracks.size(); ++i )
+	{
+		if( m_tracks[i]->type() == _tt || _tt == track::NumTrackTypes )
+		{
+			++cnt;
+		}
+	}
+	m_tracksMutex.unlock();
+	return( cnt );
+}
+
+
+
+
 void trackContainer::addTrack( track * _track )
 {
 	if( _track->type() != track::HiddenAutomationTrack )
@@ -163,7 +181,6 @@ void trackContainer::removeTrack( track * _track )
 
 
 
-
 void trackContainer::updateAfterTrackAdd( void )
 {
 }
@@ -171,7 +188,6 @@ void trackContainer::updateAfterTrackAdd( void )
 
 
 
-
 void trackContainer::clearAllTracks( void )
 {
 	//m_tracksMutex.lockForWrite();
@@ -185,19 +201,17 @@ void trackContainer::clearAllTracks( void )
 
 
 
-int trackContainer::countTracks( track::TrackTypes _tt ) const
+bool trackContainer::isEmpty( void ) const
 {
-	int cnt = 0;
-	m_tracksMutex.lockForRead();
-	for( int i = 0; i < m_tracks.size(); ++i )
+	for( trackList::const_iterator it = m_tracks.begin();
+						it != m_tracks.end(); ++it )
 	{
-		if( m_tracks[i]->type() == _tt || _tt == track::NumTrackTypes )
+		if( !( *it )->getTCOs().isEmpty() )
 		{
-			++cnt;
+			return false;
 		}
 	}
-	m_tracksMutex.unlock();
-	return( cnt );
+	return true;
 }
 
 
diff --git a/src/gui/main_window.cpp b/src/gui/main_window.cpp
index 7a891cf64..ec7af69cf 100644
--- a/src/gui/main_window.cpp
+++ b/src/gui/main_window.cpp
@@ -531,7 +531,7 @@ bool mainWindow::mayChangeProject( void )
 		return( TRUE );
 	}
 
-	QMessageBox mb ( tr( "Project not saved" ),
+	QMessageBox mb( tr( "Project not saved" ),
 				tr( "The current project was modified since "
 					"last saving. Do you want to save it "
 								"now?" ),