From 278d3859689ca139c96a86773c81ac1699774534 Mon Sep 17 00:00:00 2001
From: Jakub Melka <Mgr.Jakub.Melka@gmail.com>
Date: Sun, 3 Sep 2023 16:09:14 +0200
Subject: [PATCH] Issue #65: Text2Speech doesn't work on Linux

---
 Pdf4QtViewer/pdfsidebarwidget.cpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/Pdf4QtViewer/pdfsidebarwidget.cpp b/Pdf4QtViewer/pdfsidebarwidget.cpp
index aea1f30..c23617c 100644
--- a/Pdf4QtViewer/pdfsidebarwidget.cpp
+++ b/Pdf4QtViewer/pdfsidebarwidget.cpp
@@ -36,6 +36,7 @@
 #include <QStandardPaths>
 #include <QMessageBox>
 #include <QPainter>
+#include <QTextToSpeech>
 
 namespace pdfviewer
 {
@@ -275,6 +276,20 @@ void PDFSidebarWidget::selectPage(Page page)
             ui->stackedWidget->setCurrentWidget(pageInfo.second.page);
         }
     }
+
+    if (page == Speech && ui->speechVoiceComboBox->count() == 0)
+    {
+        // Check, if speech engine is properly set
+        QStringList speechEngines = QTextToSpeech::availableEngines();
+        if (speechEngines.isEmpty())
+        {
+            QMessageBox::critical(this, tr("Error"), tr("Speech feature is unavailable. No speech engines detected. If you're using Linux, please install speech libraries like 'flite' or 'speechd'."));
+        }
+        else
+        {
+            QMessageBox::critical(this, tr("Error"), tr("The speech feature is available, but its options are not properly set. Please check the speech settings in the options dialog."));
+        }
+    }
 }
 
 std::vector<PDFSidebarWidget::Page> PDFSidebarWidget::getValidPages() const