using signal slot to update the combobox entries

QtMeshViewer/Source/MainWindow.cpp

@@ -58,6 +58,8 @@ MainWindow::MainWindow(QWidget *parent)
 
 	// setup dropdown
 	setupAssetLibrary();
+	connect(SettingsManager::getInstance(), &SettingsManager::dirsChanged, this, &MainWindow::setupAssetLibrary);
+
 	printMessage("MeshViewer by Anakin", 0);
 }
 
@@ -167,29 +169,17 @@ void MainWindow::setupWidgets()
 	m_output->raise();
 }
 
-void MainWindow::setupAssetLibrary()
-{
-	// get all directories and put them in the dropdown.
-	QStringList tmp_list = SettingsManager::getInstance()->getListOfDirs();
-	for (QString &it : tmp_list)
-		ui->dirDropDownList->addItem(it, it);
-
-	// choose the current path and display it.
-	if (ui->dirDropDownList->currentData().isValid())
-		updateAssetTree(ui->dirDropDownList->currentData().toString());
-}
-
 void MainWindow::updateAssetTree(QString path)
 {
 	ui->fileListWidget->clear();
 	m_Paths.clear();
-    QDirIterator itterator(path, QStringList() << "*.msh" << "*.MSH" << "*.mesh" << "*.MESH",
+	QDirIterator itterator(path, QStringList() << "*.msh" << "*.MSH" << "*.mesh" << "*.MESH",
 												  QDir::Files, QDirIterator::Subdirectories);
 
 	while (itterator.hasNext()) {
-        ui->fileListWidget->insertItem(0, new QListWidgetItem(itterator.fileName()));
-        m_Paths.prepend(itterator.fileInfo().absoluteFilePath());
-        itterator.next();
+		ui->fileListWidget->insertItem(0, new QListWidgetItem(itterator.fileName()));
+		m_Paths.prepend(itterator.fileInfo().absoluteFilePath());
+		itterator.next();
 	}
 }
 
@@ -242,6 +232,21 @@ void MainWindow::resizeEvent(QResizeEvent * e)
 /////////////////////////////////////////////////////////////////////////
 // slots
 
+void MainWindow::setupAssetLibrary()
+{
+	// get all directories and put them in the dropdown.
+	while (ui->dirDropDownList->count() != 0)
+		ui->dirDropDownList->removeItem(0);
+
+	QStringList tmp_list = SettingsManager::getInstance()->getListOfDirs();
+	for (QString &it : tmp_list)
+		ui->dirDropDownList->addItem(it, it);
+
+	// choose the current path and display it.
+	if (ui->dirDropDownList->currentData().isValid())
+		updateAssetTree(ui->dirDropDownList->currentData().toString());
+}
+
 void MainWindow::on_fileListWidget_doubleClicked(const QModelIndex &index)
 {
 	int slotVal = index.row();

QtMeshViewer/Source/SettingsManager.cpp

@@ -238,5 +238,6 @@ void SettingsManager::updateDirectories(QString path)
 		m_listOfDirs.removeAll(path);
 	else
 		m_listOfDirs.append(path);
-}
 
+	emit dirsChanged();
+}