Improve file selection in file system widget

filesystemwidget.cpp

@@ -17,7 +17,7 @@ FilesystemWidget::FilesystemWidget(QAbstractItemModel *model, QWidget *parent) :
 
     setLayout(layout);
 
-    connect(m_listView, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(fileClicked(QModelIndex)));
+    connect(m_listView->selectionModel(), &QItemSelectionModel::currentChanged, this, &FilesystemWidget::fileClicked);
 }
 
 void FilesystemWidget::setDir(const QString &dir)
@@ -34,8 +34,9 @@ void FilesystemWidget::selectFile(int row)
     m_listView->scrollTo(index);
 }
 
-void FilesystemWidget::fileClicked(const QModelIndex &index)
+void FilesystemWidget::fileClicked(const QModelIndex &index, const QModelIndex &)
 {
+    if(index.isValid())
         emit fileSelected(index.row());
 }
 

filesystemwidget.h

@@ -16,7 +16,7 @@ public:
     void setDir(const QString &dir);
 private slots:
     void selectFile(int row);
-    void fileClicked(const QModelIndex &index);
+    void fileClicked(const QModelIndex &index, const QModelIndex &);
 signals:
     void fileSelected(int row);
 };

imageringlist.cpp

@@ -209,6 +209,13 @@ AnalyzeLevel ImageRingList::analyzeLevel() const
 void ImageRingList::loadFile(int row)
 {
     if(row < m_images.size())
+    {
+        int diff = m_currImage != m_images.end() ? row - (m_currImage - m_images.begin()) : -100;
+        if(diff == 1)
+            increment();
+        else if(diff == -1)
+            decrement();
+        else
         {
             m_firstImage = m_currImage = m_lastImage = m_images.begin()+row;
             if(m_images.empty())
@@ -238,6 +245,7 @@ void ImageRingList::loadFile(int row)
             }
         }
     }
+}
 
 void ImageRingList::loadThumbnails()
 {
@@ -333,6 +341,7 @@ void ImageRingList::setFiles(const QStringList files, const QString &currentFile
         index = 0;
 
     endResetModel();
+    m_currImage = m_images.end();
     loadFile(index);
 }
 

mainwindow.cpp

@@ -216,9 +216,11 @@ void MainWindow::keyPressEvent(QKeyEvent *event)
     switch (event->key())
     {
     case Qt::Key_Left:
+    case Qt::Key_Up:
         m_ringList->decrement();
         break;
     case Qt::Key_Right:
+    case Qt::Key_Down:
         m_ringList->increment();
         break;
     default: