using signal slot to update the combobox entries

QtMeshViewer/Header/MainWindow.h

@@ -31,7 +31,6 @@ private:
 // functions
 private:
 	void setupWidgets();
-	void setupAssetLibrary();
 	void updateAssetTree(QString);
 	void openFileDialog();
 	void openFile(QString);
@@ -46,12 +45,13 @@ public slots:
 	void printMessage(QString message, int severity);
 	void setFileInfo(QString name, QVector<Material>* materials, int vertices, int triangle);
 
+// private slots
+private slots:
+	void setupAssetLibrary();
+	void on_fileListWidget_doubleClicked(const QModelIndex &index);
+	void on_dirDropDownList_currentTextChanged(const QString &arg1);
+
 // signals
 signals:
 	void loadFile(QString);
-
-// private slots
-private slots:
-	void on_fileListWidget_doubleClicked(const QModelIndex &index);
-	void on_dirDropDownList_currentTextChanged(const QString &arg1);
 };

QtMeshViewer/Header/SettingsManager.h

@@ -72,4 +72,8 @@ public:
 	void setAutoColor(int value);
 
 	void updateDirectories(QString path);
+
+// signals
+signals:
+	void dirsChanged();
 };

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);
 }
 
@@ -167,18 +169,6 @@ 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();
@@ -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();
+}