Display info when no data is available

songbook.qrc

@@ -1,5 +1,6 @@
 <!DOCTYPE RCC><RCC version="1.0">
 <qresource>
     <file>icons/patacrep.png</file>
+    <file>icons/attention.png</file>
 </qresource>
 </RCC>

src/library.cc

@@ -61,18 +61,22 @@ void CLibrary::setPathToSongs(const QString path)
   m_pathToSongs = path;
 }
 //------------------------------------------------------------------------------
-void CLibrary::retrieveSongs()
+bool CLibrary::retrieveSongs()
 {
+  bool res = false;
   QStringList filter;
   filter << "*.sg";
 
   QString path = QString("%1/songs/").arg(pathToSongs());
   QDirIterator it(path, filter, QDir::NoFilter, QDirIterator::Subdirectories);
 
   while(it.hasNext())
-    addSongFromFile(it.next());
-
+    {
+      res = true;
+      addSongFromFile(it.next());
+    }
   submitAll();
+  return res;
 }
 //------------------------------------------------------------------------------
 void CLibrary::addSongFromFile(const QString path)

src/library.hh

@@ -43,7 +43,8 @@ public:
   void setPathToSongs(const QString path);
 
 public slots:
-  void retrieveSongs();
+  /// @return false if no song could be found
+  bool retrieveSongs();
 
 public:
   void addSongFromFile(const QString path);

src/mainwindow.cc

@@ -18,9 +18,9 @@
 #include <QtGui>
 #include <QtSql>
 #include <QtAlgorithms>
+#include <QDebug>
 
 #include "label.hh"
-
 #include "mainwindow.hh"
 #include "preferences.hh"
 #include "library.hh"
@@ -29,8 +29,6 @@
 #include "download.hh"
 #include "song-editor.hh"
 #include "dialog-new-song.hh"
-
-#include <QDebug>
 //******************************************************************************
 CMainWindow::CMainWindow()
   : QMainWindow()
@@ -63,6 +61,21 @@ CMainWindow::CMainWindow()
   m_log->setMaximumHeight(150);
   m_log->setReadOnly(true);
 
+  // no data info widget
+  m_noDataInfo = new QTextEdit;
+  m_noDataInfo->setReadOnly(true);
+  m_noDataInfo->setMaximumHeight(150);
+  m_noDataInfo->setHtml(QString(tr("<table><tr><td valign=middle>  "
+				   "<img src=\":/icons/attention.png\" />  </td><td>"
+				   "<p>The directory <b>%1</b> does not contain any song file (\".sg\").<br/><br/> "
+				   "You may :<ul><li>select a valid directory in the menu <i>Edit/Preferences</i></li>"
+				   "<li>use the menu <i>Library/Download</i> to get the latest git snapshot</li>"
+				   "<li>manually download the latest tarball on "
+				   "<a href=\"http://www.patacrep.com/static1/downloads\">"
+				   "patacrep.com</a></li></ul>"
+				   "</p></td></tr></table>")).arg(workingPath()));
+  m_noDataInfo->hide();
+
   // toolbar (for the build button)
   m_toolbar = new QToolBar;
   m_toolbar->setMovable(false);
@@ -78,8 +91,8 @@ CMainWindow::CMainWindow()
   m_toolbar->addAction(m_buildAct);
 
   //Connection to database
-  if (!connectDb())
-    refreshLibrary(); //database did not exist 
+  connectDb();
+  refreshLibrary();
 
   // initialize the filtering proxy
   m_proxyModel->setDynamicSortFilter(true);
@@ -111,8 +124,9 @@ CMainWindow::CMainWindow()
   horizontalLayout->addStretch();
   horizontalLayout->addLayout(filterLayout);
 
-  // Main widgets
+  //Layouts
   QBoxLayout *mainLayout = new QVBoxLayout;
+  QBoxLayout *dataLayout = new QVBoxLayout;
   QBoxLayout *centerLayout = new QHBoxLayout;
   QBoxLayout *leftLayout = new QVBoxLayout;
   leftLayout->addWidget(new QLabel(tr("<b>Songbook</b>")));
@@ -125,9 +139,11 @@ CMainWindow::CMainWindow()
   leftLayout->addWidget(createSongInfoWidget());
   leftLayout->setStretch(1,4);
   leftLayout->setStretch(3,1);
+  dataLayout->addWidget(m_view);
+  dataLayout->addWidget(m_noDataInfo);
   centerLayout->addLayout(leftLayout);
   centerLayout->setStretch(0,1);
-  centerLayout->addWidget(m_view);
+  centerLayout->addLayout(dataLayout);
   centerLayout->setStretch(1,2);
   mainLayout->addLayout(centerLayout);
   mainLayout->addWidget(m_log);
@@ -335,7 +351,7 @@ void CMainWindow::createActions()
   connect(m_refreshLibraryAct, SIGNAL(triggered()), this, SLOT(refreshLibrary()));
 
   m_rebuildLibraryAct = new QAction(tr("Rebuild"), this);
-  m_refreshLibraryAct->setStatusTip(tr("Rebuild the current song list from \".sg\" files"));
+  m_rebuildLibraryAct->setStatusTip(tr("Rebuild the current song list from \".sg\" files"));
   connect(m_rebuildLibraryAct, SIGNAL(triggered()), this, SLOT(rebuildLibrary()));
 
   m_downloadDbAct = new QAction(tr("Download"),this);
@@ -443,9 +459,13 @@ bool CMainWindow::connectDb()
 //------------------------------------------------------------------------------
 void CMainWindow::refreshLibrary()
 {
+  m_noDataInfo->hide();
+
   // Retrieve all songs from .sg files in working dir
   m_library->setPathToSongs(workingPath());
-  m_library->retrieveSongs();
+  if(!m_library->retrieveSongs())
+    m_noDataInfo->show();
+
   m_view->sortByColumn(1, Qt::AscendingOrder);
   m_view->sortByColumn(0, Qt::AscendingOrder);
   m_view->show();

src/mainwindow.hh

@@ -130,6 +130,7 @@ private:
   CTabWidget* m_mainWidget;
   QTableView *m_view;
   QProgressBar* m_progressBar;
+  QTextEdit* m_noDataInfo;
 
   // Global
   QString m_workingPath;